Fire extinguishing performance evaluation method, device and equipment for energy storage battery fire extinguishing system

Abstract

The invention provides a fire extinguishing performance evaluation method, device and equipment for an energy storage battery fire extinguishing system, and belongs to the field of battery energy storage system safety. The evaluation method comprises the following steps: acquiring real-time test data of multiple fire extinguishing performance indexes in different fire extinguishing stages; comparing the real-time test data of each fire extinguishing performance index with historical reference data, and determining an effective score of each fire extinguishing performance index; determining a weight value of each fire extinguishing performance index; based on the effective scores and the weight values of the multiple fire extinguishing performance indexes, the scoring result of the battery fire extinguishing process is determined; and determining an evaluation grade of the fire disposal capability of the fire extinguishing system based on a scoring result of the battery fire extinguishing process. Through the method provided by the invention, the battery fire disposal capability can be reflected more truly and comprehensively, and the calculation result is more comprehensive and accurate.

Description

Technical Field

[0001] The present invention relates to the field of battery energy storage system safety technology, and in particular to a fire extinguishing performance evaluation method for an energy storage battery fire extinguishing system, a fire extinguishing performance evaluation device for an energy storage battery fire extinguishing system, and electronic equipment and a computer-readable storage medium for implementing the fire extinguishing performance evaluation method. Background Art

[0002] When there are many batteries in an energy storage power station and they are densely arranged, the number of single cells inside the energy storage compartment can reach tens of thousands. Thermal runaway of single cells can easily lead to chain reactions in surrounding batteries, causing fires and explosions. After a fire occurs in an energy storage power station, the batteries burn due to thermal runaway, and lithium iron phosphate batteries and ternary lithium batteries will burn in various forms. As the temperature inside the battery continues to rise, the battery diaphragm continues to melt and shrinks until the positive and negative electrodes of the battery come into contact. At this time, the battery short-circuits and continues to release a large amount of energy, causing the temperature to rise rapidly. The battery electrolyte decomposes and reacts with other organic solvents inside, exothermic chemically, and begins to release CO 2 , HF, H 2When the temperature rises to about 300°C, the lithium inside the lithium-ion battery reacts chemically with the electrolyte and organic solvent, and begins to produce a large amount of hydrocarbon combustible gases, such as methane and ethane. Since the battery itself constitutes a closed space, the gas cannot diffuse quickly. At this time, the gas accumulates in large quantities inside the battery, causing the battery to bulge. If the battery is still in a charging state at this time, the positive electrode of the battery continues to undergo a strong redox reaction with the battery electrolyte. This process will cause the battery to quickly rise to a high temperature and release a large amount of toxic gas. Since most energy storage power stations currently use energy storage cabins, the battery modules in the cabins are closely arranged in clusters. Battery modules in a high-temperature state of thermal runaway are very likely to affect other battery modules to have thermal runaway, causing a chain reaction, and ultimately causing the battery to have an open flame, start burning, and explode. Fires caused by thermal runaway of lithium-ion batteries are electrical fires. Lithium-ion batteries, as energy storage materials, release a large amount of energy when they burn due to thermal runaway, which leads to an increase in the speed of fire spread and a rapid increase in the intensity of the fire. In addition, the electrochemical reaction when the battery burns will produce a large amount of flammable and toxic gases, which further increases the difficulty of fire fighting. According to the different fuels that ignite when the lithium-ion battery is thermally runaway, battery fires in energy storage power stations can be divided into the following five categories: solid fires fueled by battery negative electrode materials (Class A); liquid fires fueled by battery electrolytes (Class B); gas fires fueled by a large amount of flammable gases produced by the electrochemical reaction of battery thermal runaway (Class C); metal fires fueled by lithium embedded in the battery and other metal materials (Class D); and electrical fires fueled by the entire system of various energy-containing equipment, battery module clusters, etc. in the entire energy storage power station, which is the most serious and most harmful (Class E). However, most of the current research on battery overcharge thermal runaway is based on laboratory environments, which cannot fully reflect the operating conditions of lithium-ion battery modules in the environment of energy storage power stations, and the process of lithium-ion batteries is affected by many factors. The thermal runaway of lithium-ion batteries has a spreading characteristic. When a single battery is overcharged and has thermal runaway, it is very easy to cause the adjacent batteries to also have thermal runaway.

[0003] At present, the commonly used fire extinguishing agents in energy storage power stations include heptafluoropropane, perfluorohexanone, fine water mist, water spray, compressed air foam and other fire extinguishing agents. Some energy storage power stations use two fire extinguishing agents to extinguish fires in coordination. However, none of the above fire extinguishing agents can fully deal with fires in energy storage batteries. The flames of battery fires, the burning of high-temperature electrolytes and accessories in the batteries, the smoke and dust in the battery compartment, and flammable and explosive gases are all objects that require emergency disposal. For example, gas fire extinguishing agents can only extinguish open flames, and the cooling effect is extremely weak; fine water mist can only cool down, and cannot quickly extinguish open flames in the cabin; foam is a flooding fire extinguishing cooling, eliminating smoke and dust, with low efficiency, but cannot eliminate flammable gases in the cabin. In short, each fire extinguishing technology has its own advantages and cannot fully meet the needs of energy storage battery fire extinguishing.

[0004] In order to deal with lithium-ion battery fires, when conducting lithium-ion battery fire extinguishing experiments using traditional fire extinguishing agents, the fire extinguishing agents are directly applied to the lithium-ion battery body. However, the lithium-ion battery packs actually used are all equipped with enclosures such as outer shells. Therefore, the fire extinguishing experiment of directly applying the fire extinguishing agent to the lithium-ion battery body does not match the actual situation, which will cause distortion of the experimental data.

[0005] For example, a Chinese patent document with a publication date of September 22, 2017 and a publication number of CN107185133A proposed an energy storage power station early warning and fire fighting system. This patent application considers the fire fighting design of the energy storage power station from the perspective of fire prevention early warning to fire extinguishing after the fire occurs, but it does not disclose whether the fire extinguishing system in the fire fighting design can completely extinguish the fire after it is activated. A Chinese patent document with a publication date of May 7, 2019 and a publication number of CN109718490A proposed a method for screening the amount of fire extinguishing agent for extinguishing lithium-ion battery fires. This patent application is the same as the fire extinguishing test scenario for battery fires at home and abroad, and only stays in the single cell fire scenario, lacking the scenario test of module-level battery fire extinguishing. Due to the inconsistency of battery cells, the danger of battery modules or battery clusters composed of multiple battery cells connected in series and parallel is greatly increased, and the data results of single cells cannot ensure the effectiveness of fire extinguishing when a fire occurs in a battery module or battery cluster.

[0006] In view of the above problems, it is urgent to propose a fire-fighting capability evaluation method covering all factors to quantitatively describe the research object's ability to deal with energy storage battery fires. Summary of the invention

[0007] In view of the technical problem that there is a lack of quantitative evaluation of the fire handling capability of energy storage battery fire extinguishing systems in the prior art, the present invention provides a fire extinguishing performance evaluation method for energy storage battery fire extinguishing systems. This method can comprehensively evaluate the fire handling capability of the fire extinguishing agent, and can evaluate the effectiveness and reliability of the energy storage battery fire extinguishing agent and the fire extinguishing system configuration.

[0008] To achieve the above-mentioned purpose, the first aspect of the present invention provides a method for evaluating the fire extinguishing performance of an energy storage battery fire extinguishing system, the evaluation method comprising the following steps: after the fire extinguishing test of the energy storage battery fire extinguishing system is completed, obtaining real-time test data of multiple fire extinguishing performance indicators at different fire extinguishing stages, the multiple fire extinguishing performance indicators including the temperature field T in the battery compartment, the gas concentration value G in the battery compartment, the smoke concentration value F in the battery compartment and the internal temperature value M of the battery; comparing the real-time test data of each fire extinguishing performance indicator with the corresponding historical reference data to determine the effective score of each fire extinguishing performance indicator; determining the weight value of each fire extinguishing performance indicator; determining the scoring result of the battery fire extinguishing process based on the effective score and weight value of each fire extinguishing performance indicator in the multiple fire extinguishing performance indicators; and determining the evaluation level of the fire handling capability of the fire extinguishing system based on the scoring result of the battery fire extinguishing process.

[0009] In an exemplary embodiment of the present invention, the plurality of fire extinguishing performance indicators may further include: a pressure value P in the battery compartment, an infrared imaging measurement value X, an in-cabin monitoring image H, a fire extinguishing agent injection flow rate m, and a fire extinguishing duration t.

[0010] In an exemplary embodiment of the present invention, determining the scoring result of the battery fire extinguishing process based on the effective score and weight value of each fire extinguishing performance indicator in the multiple fire extinguishing performance indicators may include: judging whether there is at least one fire extinguishing performance indicator with an effective score of 0; if so, determining that the scoring result of the battery fire extinguishing process is 0; if not, determining the sum of the products of the effective scores and weight values ​​of the multiple fire extinguishing performance indicators as the scoring result of the battery fire extinguishing process.

[0011] In an exemplary embodiment of the present invention, the evaluation level of the fire handling capability of the fire extinguishing system based on the scoring result of the battery fire extinguishing process may include: comparing the scoring result of the battery fire extinguishing process with the size of each fire extinguishing performance threshold; if the scoring result of the battery fire extinguishing process is greater than the first score, it is determined to be the first fire extinguishing performance level; if the scoring result of the battery fire extinguishing process is greater than the second score and less than the first score, it is determined to be the second fire extinguishing performance level; if the scoring result of the battery fire extinguishing process is greater than the third score and less than the second score, it is determined to be the third fire extinguishing performance level; if the scoring result of the battery fire extinguishing process is greater than the fourth score and less than the third score, it is determined to be the third fire extinguishing performance level. , it is determined as the fourth fire extinguishing performance level; if the scoring result of the battery fire extinguishing process is less than the fourth score, it is determined as the fifth fire extinguishing performance level; wherein the fire handling capability of the first fire extinguishing performance level is better than that of the second fire extinguishing performance level, the fire handling capability of the second fire extinguishing performance level is better than that of the third fire extinguishing performance level, the fire handling capability of the third fire extinguishing performance level is better than that of the fourth fire extinguishing performance level, and the fire handling capability of the fourth fire extinguishing performance level is better than that of the fifth fire extinguishing performance level; the first score is greater than the second score, the second score is greater than the third score, and the third score is greater than the fourth score.

[0012] In an exemplary embodiment of the present invention, the evaluation method may further include: obtaining revised fire extinguishing performance indicators by adjusting the effective score of at least one fire extinguishing performance indicator among multiple fire extinguishing performance indicators; comparing and analyzing the revised fire extinguishing performance indicators with relevant data families in a fire extinguishing database to determine recommended values ​​of fire extinguishing system design parameters; the fire extinguishing database stores experimental data, historical operation data, accident case data and expert experience data of the energy storage battery fire extinguishing process.

[0013] In an exemplary embodiment of the present invention, the said comparing and analyzing the corrected fire extinguishing performance indicators with the relevant data families in the fire extinguishing database to determine the recommended values ​​of the fire extinguishing system design parameters may include: comparing and analyzing the corrected temperature field T in the battery compartment, the fire extinguishing duration t, the fire extinguishing agent injection flow rate m and the battery internal temperature value M with the relevant data families in the fire extinguishing database to determine the recommended value of the fire extinguishing agent flow rate, the recommended value of the fire extinguishing agent pressure and the first recommended value of the fire extinguishing agent continuous injection time; comparing and analyzing the corrected infrared imaging measurement value X, the cabin monitoring image H, the battery internal temperature value M and the fire extinguishing duration t with the relevant data families in the fire extinguishing database to determine the recommended value of the fire extinguishing agent nozzle arrangement and the second recommended value of the fire extinguishing agent continuous injection time; comparing and analyzing the corrected gas concentration value G in the battery compartment, the pressure value P in the battery compartment, the smoke concentration value F in the battery compartment, the fire extinguishing agent injection flow rate m and the fire extinguishing duration t with the relevant data families in the fire extinguishing database to determine the recommended value of the fire extinguishing agent type; determining the larger of the first recommended value and the second recommended value of the fire extinguishing agent continuous injection time as the final recommended value of the fire extinguishing agent continuous injection time.

[0014] The second aspect of the present invention provides a fire extinguishing performance evaluation device for an energy storage battery fire extinguishing system, the evaluation device comprising an information acquisition unit, an information analysis unit and a fire extinguishing performance evaluation unit; the information acquisition unit is used to obtain real-time test data of multiple fire extinguishing performance indicators at different fire extinguishing stages after the fire extinguishing test of the energy storage battery fire extinguishing system is completed; the information analysis unit comprises an effective score determination module, a weight value determination module and a fire extinguishing process analysis module; wherein the effective score determination module is used to compare the real-time test data of each fire extinguishing performance indicator with the corresponding historical reference data to determine the effective score of each fire extinguishing performance indicator; the weight value determination module is used to determine the weight value of each fire extinguishing performance indicator; the fire extinguishing process analysis module is used to determine the scoring result of the battery fire extinguishing process based on the effective score and weight value of each fire extinguishing performance indicator in the multiple fire extinguishing performance indicators; the fire extinguishing performance evaluation unit is used to determine the evaluation level of the fire handling capability of the fire extinguishing system based on the scoring result of the battery fire extinguishing process.

[0015] In another exemplary embodiment of the present invention, the fire extinguishing process analysis module includes a judgment submodule, a first scoring submodule and a second scoring submodule; the judgment submodule is used to judge whether there is at least one fire extinguishing performance indicator with an effective score of 0, and output the judgment result; the first scoring submodule is used to determine the scoring result of the battery fire extinguishing process as 0 when the judgment result is that there is at least one fire extinguishing performance indicator with an effective score of 0; the second scoring submodule is used to determine the scoring result of the battery fire extinguishing process as the sum of the products of the effective scores of multiple fire extinguishing performance indicators and the weight values ​​when it is judged that the effective scores of all fire extinguishing performance indicators are not 0.

[0016] In another exemplary embodiment of the present invention, the fire extinguishing performance evaluation unit may include a comparison module, a first evaluation module, a second evaluation module, a third evaluation module, a fourth evaluation module and a fifth evaluation module; the comparison module is used to compare the scoring result of the battery fire extinguishing process with the size of each fire extinguishing performance threshold; the first evaluation module is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the first fire extinguishing performance level when the scoring result of the battery fire extinguishing process is greater than the first score; the second evaluation module is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the second fire extinguishing performance level when the scoring result of the battery fire extinguishing process is greater than the second score and less than the first score; the third evaluation module is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the third fire extinguishing performance level when the scoring result of the battery fire extinguishing process is greater than the third score and less than the second score; The fourth evaluation module is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the fourth fire extinguishing performance level when the scoring result of the battery fire extinguishing process is greater than the fourth score and less than the third score; the fifth evaluation module is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the fifth fire extinguishing performance level when the scoring result of the battery fire extinguishing process is less than the fourth score; wherein the fire handling capability of the first fire extinguishing performance level is better than the second fire extinguishing performance level, the fire handling capability of the second fire extinguishing performance level is better than the third fire extinguishing performance level, the fire handling capability of the third fire extinguishing performance level is better than the fourth fire extinguishing performance level, and the fire handling capability of the fourth fire extinguishing performance level is better than the fifth fire extinguishing performance level; the first score is greater than the second score, the second score is greater than the third score, and the third score is greater than the fourth score.

[0017] In another exemplary embodiment of the present invention, the evaluation device may also include a fire extinguishing system design unit, which includes a fire extinguishing database, an adjustment module and a recommended value determination module; the fire extinguishing database stores experimental data, historical operation data, accident case data and expert experience data of the energy storage battery fire extinguishing process; the adjustment module is used to obtain revised fire extinguishing performance indicators by adjusting the effective score of at least one fire extinguishing performance indicator among multiple fire extinguishing performance indicators; the recommended value determination module is used to compare and analyze the revised fire extinguishing performance indicators with the relevant data families in the fire extinguishing database, and determine the recommended values ​​of the fire extinguishing system design parameters.

[0018] A third aspect of the present invention provides an electronic device, comprising a processor and a memory, wherein the memory stores at least one computer program, and the at least one computer program is loaded and executed by one or more of the above processors to enable the computer to implement the above-mentioned fire extinguishing performance evaluation method.

[0019] A fourth aspect of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores at least one program code, and the program code is loaded and executed by a processor to enable a computer to implement the above-mentioned fire extinguishing performance evaluation method.

[0020] Through the technical solution provided by the present invention, the present invention has at least the following technical effects:

[0021] (1) The present invention provides a fire extinguishing performance evaluation method, which comprehensively evaluates the fire handling capability of the fire extinguishing system (or fire extinguishing agent) from four aspects, namely, fire extinguishing of burning batteries, cooling of all batteries in the cabin, smoke absorption in the cabin, and gas absorption in the cabin, and is closely integrated with the actual situation of energy storage battery fires;

[0022] (2) Compared with the method for evaluating the single performance of fire extinguishing agents in the prior art, the fire extinguishing performance evaluation method provided by the present invention can more truly and comprehensively reflect the battery fire handling capability, and the calculation results are more comprehensive and accurate;

[0023] (3) The fire extinguishing performance evaluation method provided by the present invention is based on the multi-source data of the battery compartment and the fire database, and provides the recommended values ​​of the fire extinguishing agent type and design parameters, which can provide guidance for the configuration of the fire protection system.

[0024] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0026] Figure 1 A schematic diagram of the design logic of a method for evaluating the fire extinguishing performance of an energy storage battery fire extinguishing system provided in an embodiment of the present invention;

[0027] Figure 2 A flow chart of a method for evaluating the fire extinguishing performance of an energy storage battery fire extinguishing system provided by an embodiment of the present invention;

[0028] Figure 3A A schematic diagram of a change curve of the temperature field T in the battery compartment provided by an embodiment of the present invention;

[0029] Figure 3B A schematic diagram of a change curve of a gas concentration value G in a battery compartment provided by an embodiment of the present invention;

[0030] Figure 3C A schematic diagram of a variation curve of a smoke concentration value F in a battery compartment provided by an embodiment of the present invention;

[0031] Figure 4A A schematic diagram of a change curve of the pressure value P in the battery compartment provided by an embodiment of the present invention;

[0032] Figure 4B A schematic diagram of a change curve of the in-cabin monitoring image H provided by an embodiment of the present invention;

[0033] Figure 5 A schematic diagram of the structure of a fire extinguishing performance evaluation device for an energy storage battery fire extinguishing system provided by an embodiment of the present invention;

[0034] Figure 6 A structural schematic diagram of another fire extinguishing performance evaluation device for an energy storage battery fire extinguishing system provided by an embodiment of the present invention;

[0035] Figure 7 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention.

[0036] Description of Reference Numerals

[0037] 101-information acquisition unit, 102-information analysis unit, 103-fire extinguishing performance evaluation unit, 104-fire extinguishing system design unit, 1021-effective score determination module, 1022-weight value determination module, 1023-fire extinguishing process analysis module, 1023a-judgment submodule, 1023b-first scoring submodule, 1023c-second scoring submodule, 1031-comparison module, 1032-first evaluation module, 1033-second evaluation module, 1034-third evaluation module, 1035-fourth evaluation module, 1036-fifth evaluation module, 1041-fire extinguishing database, 1042-adjustment module, 1043-recommended value determination module, 201-processor, 202 memory. DETAILED DESCRIPTION

[0038] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0040] In the present invention, unless otherwise specified, the directional words used, such as "upper, lower, top, bottom", are usually used to describe the relative positional relationship of the components in terms of the directions shown in the drawings or in terms of the vertical, perpendicular or gravity directions. "First", "second", etc. are only used for the convenience of description and distinction, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a direct connection, or an indirect connection; it can be a wired connection, or a wireless connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0042] In view of the problem that the current battery fire extinguishing detection method is single and the experimental device is poorly matched with the characteristics of battery fire, the present invention proposes a fire extinguishing performance evaluation method for an energy storage battery fire extinguishing system, such as Figure 1 As shown in the figure, the evaluation method analyzes data such as multi-point air temperature, cabin pressure, multi-point smoke concentration, multi-point gas concentration, battery internal temperature, cabin infrared imaging temperature measurement, and cabin video surveillance image analysis in the energy storage battery cabin, assigns values ​​to each evaluation factor based on experimental test data, accident case data, and simulation calculation data, establishes an analysis model and calculation program, and divides battery fire extinguishing into five stages: initial fire extinguishing, combustion growth stage, peak stage fire extinguishing, fire extinguishing end stage, and post-fire extinguishing re-ignition observation stage. The handling capacity of a certain fire extinguishing agent in each stage of battery fire extinguishing is analyzed, and the quantitative evaluation results of the handling capacity are given, and then the recommended values ​​of fire extinguishing agent type and fire protection system design parameters are given, including fire extinguishing agent injection flow rate, continuous injection time, fire extinguishing agent nozzle distribution method, fire extinguishing agent type, etc.

[0043] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0044] Embodiment 1

[0045] Please refer to Figure 2 The first embodiment of the present invention provides a method for evaluating the fire extinguishing performance of an energy storage battery fire extinguishing system, the evaluation method comprising the following steps:

[0046] Step S101: After the fire extinguishing test of the energy storage battery fire extinguishing system is completed, real-time test data of multiple fire extinguishing performance indicators at different fire extinguishing stages are obtained.

[0047] Among them, during the fire extinguishing test of the energy storage battery fire extinguishing system, if no obvious flame is found on the surface of the battery, the fire extinguishing test can be ended, and data analysis can be performed on the collected spatiotemporal variation data of various fire extinguishing performance indicators. The fire extinguishing process of the energy storage battery fire extinguishing system can be divided into five fire extinguishing stages, namely the initial fire extinguishing stage, the combustion growth stage, the peak fire extinguishing stage, the fire extinguishing end stage, and the post-fire extinguishing re-ignition observation stage. Each fire extinguishing performance indicator can present different curve change characteristics in different fire extinguishing stages. By obtaining the real-time test data of each fire extinguishing performance indicator at different fire extinguishing stages, parameter change curves are formed respectively, which can display the spatiotemporal variation information of each fire extinguishing performance indicator.

[0048] The multiple fire extinguishing performance indicators are the temperature field T in the battery compartment, the gas concentration value G in the battery compartment, the smoke concentration value F in the battery compartment, and the battery internal temperature value M. These four fire extinguishing performance indicators represent the fire extinguishing information of multi-point smoke concentration, multi-point gas temperature, and multi-point gas concentration in the battery compartment, and can evaluate the fire extinguishing capability of the energy storage battery fire extinguishing system in multiple dimensions.

[0049] It should be noted that the temperature field T in the battery compartment refers to the ambient temperature at at least four different locations in the battery compartment, and the unit can be °C. These four locations include the top and bottom of the battery compartment, the front and rear ends of the battery compartment, and the temperature information collected at these four locations can fully reflect the temperature field distribution in the battery compartment. Figure 3A As shown in the figure, for the fire extinguishing performance index of the temperature field T in the battery compartment, its change process can characterize the different fire extinguishing stages of the energy storage battery. For example, if T is less than 80℃, the current fire extinguishing process of the energy storage battery can be considered to be in a safe state; if 80℃<T<180℃, the current fire extinguishing process of the energy storage battery can be considered to be in the initial stage of the fire; if 180℃<T<800℃, the current fire extinguishing process of the energy storage battery can be considered to be in the combustion growth stage; if T>800℃, the current fire extinguishing process of the energy storage battery can be considered to be in the intense combustion stage; if T recovers from high temperature to less than 80℃, the current fire extinguishing process of the energy storage battery can be considered to be in the re-ignition observation stage. The gas concentration value G in the battery compartment refers to the measured value of the gas volume concentration in the battery compartment at least 4 different positions in the battery compartment, and the unit can be mL / L. The gas in the cabin includes cabin alkanes, hydrogen, hydrogen fluoride, carbon dioxide and other gases. For the fire extinguishing performance indicator of the gas concentration value G in the battery compartment, G can reflect the distribution of the gas in the compartment, and its change process can indicate whether the battery is in a safe state. Figure 3B As shown, the gas concentration value G in the battery compartment shows different curve change characteristics in different fire extinguishing stages. For example, if the gas concentration value G in the battery compartment is greater than 0, it can be considered that the battery is still in an accident state and fire extinguishing measures should be taken.

[0050] The smoke concentration value F in the battery compartment refers to the measured value of the smoke concentration at at least four different locations in the battery compartment, and the unit can be g / m3. For the fire extinguishing performance indicator of the smoke concentration value F in the battery compartment, F can reflect the distribution of smoke in the compartment, and its change process can indicate whether the battery is in a safe state. Figure 3C As shown in the figure, the smoke concentration value F in the battery compartment shows different curve change characteristics in different fire extinguishing stages. For example, if the smoke concentration value F in the battery compartment is greater than 0.05g / m3, it can be considered that the battery is still in an accident state and fire extinguishing measures should be taken.

[0051] The battery internal temperature value M is taken from the battery management system. All battery temperature values ​​are sorted from high to low, and the first 5 to 10 values ​​are taken as the battery internal temperature value, and the position of this data point is obtained in °C. For the battery internal temperature value M, a fire extinguishing performance indicator, M can reflect the temperature change inside the battery, and its change process can characterize whether the battery is in a safe state. For example, if the battery internal temperature value M is higher than the normal operating temperature of the battery, it can be considered that the battery is still in an accident state and fire extinguishing measures should be taken.

[0052] Step S102: Compare the real-time test data of each fire extinguishing performance indicator with the corresponding historical reference data to determine the effective score of each fire extinguishing performance indicator.

[0053] For example, for the temperature field T in the battery compartment, if the measured temperature value in the compartment is 0 to 10°C higher than the normal operating temperature in the compartment (i.e. 0°C <T-T 0 <10℃, T 0 refers to the normal operating temperature in the cabin), the effective score of the temperature field in the battery cabin is E T 90 to 100 points can be taken; if the measured temperature value in the cabin is 10 to 40°C higher than the normal working temperature in the cabin (i.e. 10°C <T-T 0 <40℃), the effective value of the temperature field in the battery compartment is E T 70 to 90 points can be taken; if the measured temperature value in the cabin is 50 to 80 degrees higher than the normal operating temperature in the cabin (i.e. 50 degrees <T-T 0 <80℃), the effective value of the temperature field in the battery compartment is E T 60 points can be taken; if the measured temperature value in the cabin is higher than the normal operating temperature in the cabin by more than 80℃ (that is, TT 0 >80℃), the effective value of the temperature field in the battery compartment is E T You can get 0 points.

[0054] For the gas concentration value G in the battery compartment, if the gas volume concentration in the compartment obtained by detection is less than 5%, the effective score of the gas concentration value in the battery compartment E G It can be scored 90 to 100 points. If the gas volume concentration in the cabin is between 5% and 10%, the effective score of the gas concentration value in the battery cabin is E G It can be scored 70 to 90 points. If the gas volume concentration in the cabin is between 10% and 20%, the effective score of the gas concentration value in the battery cabin is E G It can be scored 60 to 70 points. If the gas volume concentration in the cabin obtained by the test is higher than 20%, the effective score of the gas concentration value in the battery cabin is E G You can get 0 points.

[0055] For the smoke concentration value F in the battery compartment, if the smoke volume concentration in the compartment obtained by detection is less than 5%, the effective score E of the smoke concentration value in the battery compartment is F It can be scored 90 to 100 points. If the smoke volume concentration in the cabin is between 5% and 10%, the effective score of the smoke concentration value in the battery cabin is E F It can be scored 70 to 90 points. If the smoke volume concentration in the cabin is between 10% and 20%, the effective score of the smoke concentration value in the battery cabin is E F It can be scored 60 to 70 points. If the smoke volume concentration in the cabin obtained by the test is higher than 20%, the effective score of the smoke concentration value in the battery cabin is E F You can get 0 points.

[0056] For the battery internal temperature value M, if the battery internal temperature is higher than the normal operating temperature of the battery by 0 to 10°C (i.e. 0°C <M-M 0 <10℃,M 0 is the normal operating temperature of the battery), the effective value of the internal temperature of the battery is E M It can be 90 to 100 points; if the internal temperature of the battery is higher than the normal working temperature of the battery by 10 to 40 degrees Celsius (i.e. 10 degrees Celsius <M-M 0 <40℃), the effective value of the battery internal temperature is E M It can be 70 to 90 points; if the internal temperature of the battery is higher than the normal working temperature of the battery by 50 to 80 degrees Celsius (i.e. 50 degrees Celsius <M-M 0 <80℃), the effective value of the battery internal temperature is E M 60 points can be taken; if the internal temperature of the battery is higher than the normal operating temperature of the battery and is higher than 80℃ (that is, MM 0 >80℃), the effective value of the battery internal temperature is E M You can get 0 points.

[0057] Step S103: Determine the weight value of each fire extinguishing performance indicator based on the influence of different fire extinguishing performance indicators on the fire extinguishing performance.

[0058] The weight value of each fire extinguishing performance indicator can be pre-set by considering the influence of different indicators on the fire extinguishing performance. For example, the weight value S of the temperature field in the battery compartment is T The value range of can be 0.1~0.4; the weight value S of the gas concentration value in the battery compartment G The value range of can be 0.05~0.1; The weight value S of the smoke concentration value in the battery compartment F The value range of can be 0.05~0.1; The weight value S of the battery internal temperature value M The value range of can be 0.3~0.6.

[0059] Step S104: Determine a scoring result of the battery fire extinguishing process based on the effective score and weight value of each fire extinguishing performance indicator in the plurality of fire extinguishing performance indicators.

[0060] Exemplarily, based on the effective score and weight value of each of the multiple fire extinguishing performance indicators, the process of determining the scoring result of the battery fire extinguishing process includes but is not limited to the following sub-steps S1041 to S1043.

[0061] Sub-step S1041: Determine whether there is at least one fire extinguishing performance indicator with a valid score of 0 among the multiple fire extinguishing performance indicators.

[0062] Sub-step S1042: If yes, determine that the scoring result of the battery fire extinguishing process is 0.

[0063] Sub-step S1043: If not, the sum of the products of the effective scores of the plurality of fire extinguishing performance indicators and the weight values ​​is determined as the scoring result of the battery fire extinguishing process.

[0064] The calculation formula for the scoring result of the battery fire extinguishing process is: E = f (T, G, F, M) × S = E T ×S T +E G ×S G +E F ×S F +E M ×S M .

[0065] Step S105: Determine the evaluation level of the fire handling capability of the fire extinguishing system based on the scoring result of the battery fire extinguishing process.

[0066] Exemplarily, based on the scoring result of the battery fire extinguishing process, the process of determining the evaluation level of the fire handling capability of the fire extinguishing system includes but is not limited to the following sub-steps S1051 to S1056.

[0067] Sub-step S1051: comparing the scoring result of the battery fire extinguishing process with the values ​​of each fire extinguishing performance threshold.

[0068] Sub-step S1052: If the scoring result of the battery fire extinguishing process is greater than the first score, it is determined to be the first fire extinguishing performance level.

[0069] Sub-step S1053: If the scoring result of the battery fire extinguishing process is greater than the second score and less than the first score, it is determined to be the second fire extinguishing performance level.

[0070] Sub-step S1054: If the scoring result of the battery fire extinguishing process is greater than the third score and less than the second score, it is determined to be the third fire extinguishing performance level.

[0071] Sub-step S1055: If the scoring result of the battery fire extinguishing process is greater than the fourth score and less than the third score, it is determined to be the fourth fire extinguishing performance level.

[0072] Sub-step S1056: If the scoring result of the battery fire extinguishing process is less than the fourth score, it is determined to be the fifth fire extinguishing performance level.

[0073] Among them, the fire handling capability of the first fire extinguishing performance level is better than the second fire extinguishing performance level, the fire handling capability of the second fire extinguishing performance level is better than the third fire extinguishing performance level, the fire handling capability of the third fire extinguishing performance level is better than the fourth fire extinguishing performance level, and the fire handling capability of the fourth fire extinguishing performance level is better than the fifth fire extinguishing performance level. The first score is greater than the second score, the second score is greater than the third score, and the third score is greater than the fourth score.

[0074] For example, the first score may be set to 90 points, the second score may be set to 80 points, the third score may be set to 70 points, and the fourth score may be set to 60 points. The first fire extinguishing performance level may mean that the fire handling capability is excellent, the second fire extinguishing performance level may mean that the fire handling capability is good, the third fire extinguishing performance level may mean that the fire handling capability is medium, the fourth fire extinguishing performance level may mean that the fire handling capability is poor, and the fifth fire extinguishing performance level may mean that the fire handling capability is unsatisfactory.

[0075] The implementation environment of the embodiment of the present application includes at least one terminal and a server, and the method is executed on the terminal or the server respectively. The terminal and the server can be connected in communication to realize the interactive transmission of information. The terminal and the server calculate the scoring result by obtaining the fire extinguishing performance index, and then determine the evaluation result of the fire handling capability of the fire extinguishing system.

[0076] Among them, the terminal can be any electronic product that can interact with the user through one or more methods such as keyboard, touchpad, touch screen, voice interaction, etc., such as PC (Personal Computer), PPC (Pocket Personal Computer), tablet computer, etc.

[0077] The server can be a single server or a server cluster composed of multiple servers. It can also be a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN (Content Delivery Network), as well as big data and artificial intelligence platforms.

[0078] Embodiment 2

[0079] Referring to FIG. 3 , the second embodiment of the present invention provides another method for evaluating the fire extinguishing performance of an energy storage battery fire extinguishing system, the evaluation method comprising the following steps:

[0080] Step S201: After the fire extinguishing test of the energy storage battery fire extinguishing system is completed, real-time test data of multiple fire extinguishing performance indicators at different fire extinguishing stages are obtained.

[0081] Among them, multiple fire extinguishing performance indicators can be determined as nine items, namely, the temperature field T in the battery compartment, the gas concentration value G in the battery compartment, the smoke concentration value F in the battery compartment, the internal temperature value M of the battery, the pressure value P in the battery compartment, the infrared imaging measurement value X, the monitoring image in the compartment H, the extinguishing agent injection flow rate m and the fire extinguishing duration t. These nine fire extinguishing performance indicators characterize the fire extinguishing information in terms of multi-point smoke concentration, multi-point gas temperature, multi-point gas concentration, infrared image, monitoring image, etc. in the battery compartment, and can comprehensively and objectively evaluate the fire extinguishing and disposal capabilities of the energy storage battery fire extinguishing system.

[0082] It should be noted that the pressure value P in the battery compartment refers to the gas pressure measurement value at at least one different position in the battery compartment, in MPa. For the fire extinguishing performance indicator of the pressure value P in the battery compartment, P can reflect the real-time changes in the air pressure (gauge pressure) in the compartment, and its change process can indicate whether the battery is in a safe state. Figure 4A As shown in the figure, the pressure value P in the battery compartment shows different curve change characteristics in different fire extinguishing stages. For example, if the pressure value P in the battery compartment is greater than 0MPa, it can be considered that the battery is still in the combustion or fire extinguishing stage (i.e., accident state), and fire extinguishing measures should be taken; if the pressure value P in the battery compartment is equal to 0MPa, it can be considered that the battery is in a safe stage.

[0083] The infrared imaging measurement value X refers to the highest value in the infrared image, in degrees Celsius. By judging whether the infrared imaging measurement value X is greater than the normal temperature outside the battery pack, it can be determined whether the battery is in a safe state. For example, if there is an area outside the battery pack with a temperature exceeding 80 degrees Celsius, it can be considered that the battery is still in an accident state and fire extinguishing measures should be taken.

[0084] The in-cabin monitoring image H refers to images taken from at least two different positions in the battery compartment. The image processing software analyzes the image to determine whether there is flame information. The information value is 0 or 1. 0 means no flame image, and 1 means there is a suspicious flame image. By judging whether the information value of the in-cabin monitoring image H is 1, it can be determined whether the battery is in a safe state. Figure 4B As shown, the cabin monitoring image H shows different curve change characteristics in different fire extinguishing stages.

[0085] The fire extinguishing agent injection flow rate m refers to the injection flow rate of the fire extinguishing agent during the fire extinguishing process of the energy storage battery. For liquid fire extinguishing agents, the unit is L / s, and for gas fire extinguishing agents, the unit is kg / s.

[0086] The fire extinguishing duration t refers to the time from the start of spraying the fire extinguishing agent to the battery completely returning to normal temperature, in seconds. The fire extinguishing duration t consists of five stages: initial fire extinguishing stage t 1 , combustion growth stage t 2 , Peak firefighting stage 3 , Fire extinguishing final stage 4 and relapse observation phase 5 . Initial firefighting stage 1 It refers to the time from the start of injection to the time when the combustion cell temperature T rises to 180°C; the combustion growth stage t 2 It refers to the time when the battery temperature T rises from 180℃ to 800℃; the peak fire extinguishing stage t 3 It refers to the time that the battery temperature T remains above 800°C; the final stage of fire extinguishing t 4 It refers to the time from when the battery temperature T drops from 180°C to room temperature after the battery fire is extinguished; the re-ignition observation stage t 5 It refers to the time after the battery returns to normal temperature.

[0087] Step S202: Compare the real-time test data of each fire extinguishing performance indicator with the historical reference data corresponding to each fire extinguishing performance indicator to determine the effective score of each fire extinguishing performance indicator.

[0088] For example, for the pressure value P in the battery compartment, if the pressure value measured is higher than the atmospheric pressure by 0 to 0.2 bar (i.e. 0 bar <P-P 0 <0.2bar, P 0 is the atmospheric pressure), the effective value of the pressure in the battery compartment is E P It can be 90 to 100 points; if the pressure value obtained by measurement is higher than the atmospheric pressure by 0.2 to 0.4 bar (i.e. 0.2 bar <P-P 0 <0.4bar), the effective value of the pressure in the battery compartment is E P It can be 70 to 90 points; if the pressure value obtained by measurement is higher than the atmospheric pressure by 0.4 to 0.6 bar (i.e. 0.4 bar <P-P 0 <0.6bar), the effective value of the pressure in the battery compartment is E P It can be 60 to 70 points; if the pressure value obtained by measurement is higher than the atmospheric pressure by more than 0.6 bar (i.e. PP 0 >0.6bar), the effective value of the pressure in the battery compartment is E P You can get 0 points.

[0089] For the infrared imaging measurement value X, if the temperature in the infrared image of any point in the battery compartment is 0 to 20°C higher than the normal temperature (i.e. 0 <X-X 0 <20℃,X 0 refers to room temperature), the effective score of infrared imaging measurement value E X It can be scored 90 to 100 points; if the temperature in the infrared image of any part of the battery compartment is 20 to 40 degrees Celsius higher than the normal temperature (i.e. 20 degrees Celsius <X-X 0 <40℃), the effective score of infrared imaging measurement value is E X It can be scored 70 to 90 points; if the temperature in the infrared image of any part of the battery compartment is higher than the normal temperature by more than 40°C (i.e. XX 0 >40℃), the effective score of infrared imaging measurement value is E X You can get 0 points.

[0090] For the in-cabin monitoring image H, if there is a flame image anywhere in the battery compartment, the effective score E of the in-cabin monitoring image H 0 points can be taken; in other cases, the effective score of the in-cabin monitoring image is E H You can get 100 points.

[0091] For the extinguishing agent injection flow rate m, the calculation is based on a protected volume of 20 cubic meters. For liquid extinguishing agents, if the extinguishing agent injection flow rate is less than 20L / s, the effective score E of the extinguishing agent injection flow rate is m It can be 90 to 100 points; if the extinguishing agent injection flow rate is between 20 and 30 L / s, the effective score of the extinguishing agent injection flow rate is E m It can be 70 to 90 points; if the extinguishing agent injection flow rate is between 30 and 40 L / s, the effective score of the extinguishing agent injection flow rate is E m It can be 60 to 70 points; if the extinguishing agent injection flow rate is greater than 40L / s, the effective score E of the extinguishing agent injection flow rate is m You can get 0 points.

[0092] For gas fire extinguishing agents, if the extinguishing agent injection flow rate is less than 3kg / s, the effective score E of the extinguishing agent injection flow rate is m It can be 90 to 100 points; if the extinguishing agent injection flow rate is between 3 and 5 kg / s, the effective score of the extinguishing agent injection flow rate is E m It can be 70 to 90 points; if the extinguishing agent injection flow rate is between 5 and 7 kg / s, the effective score of the extinguishing agent injection flow rate is E m It can be 60 to 70 points; if the extinguishing agent injection flow rate is greater than 7kg / s, the effective score E of the extinguishing agent injection flow rate is m You can get 0 points.

[0093] For the fire extinguishing duration t, if the fire extinguishing duration is less than 20 minutes, the effective score of the fire extinguishing duration Et It can be 90 to 100 points; if the fire extinguishing duration is between 20 and 40 minutes, the effective score of the fire extinguishing duration is E t It can be 70 to 90 points; if the fire extinguishing duration is between 40 and 60 minutes, the effective score of the fire extinguishing duration is E t It can be 60 to 70 points. If the fire extinguishing duration exceeds 60 minutes, the effective score of the fire extinguishing duration is E t You can get 0 points.

[0094] Step S203: Determine the weight value of each fire extinguishing performance indicator based on the influence of different fire extinguishing performance indicators on the fire extinguishing performance.

[0095] For example, the weight value S of the pressure value in the battery compartment P The value range of can be 0.01~0.05; the weight value S of the infrared imaging measurement value X The value range of can be 0.2~0.5; the weight value S of the monitoring image in the cabin H The value range of can be 0.2~0.5; the weight value S of the extinguishing agent injection flow rate m The value range of can be 0.05~0.4; the weight value S of fire extinguishing duration t The value range can be 0.0~0.5.

[0096] Step S204: Determine a scoring result of the battery fire extinguishing process based on the effective score and weight value of each fire extinguishing performance indicator in the plurality of fire extinguishing performance indicators.

[0097] The calculation formula for the scoring result of the battery fire extinguishing process is:

[0098] E=f(T,P,G,F,M,X,H,t,m)×S=E T ×S T +E G ×S G +E F ×S F +E M ×S M +

[0099] E P ×S P +E X ×S X +E H ×S H +E m ×S m +E t ×S t .

[0100] Among them, if one of T, P, G, F, M, X, H, t, and m is 0, it is considered that the battery fire extinguishing has failed, S is 0, that is, E is also 0.

[0101] Step S205: Determine the evaluation level of the fire handling capability of the fire extinguishing system based on the scoring result of the battery fire extinguishing process.

[0102] Step S206: Obtain corrected fire extinguishing performance indicators by adjusting the effective score of at least one fire extinguishing performance indicator among the multiple fire extinguishing performance indicators.

[0103] The fire extinguishing database stores experimental data, historical operation data, accident case data and expert experience data of the energy storage battery fire extinguishing process.

[0104] It should be noted that, according to the scoring results of the battery fire extinguishing process and the scores of various fire extinguishing performance indicators (that is, the effective scores), several fire extinguishing performance indicators with lower scores can be adjusted. The specific operation is to re-determine the experimental value of the fire extinguishing performance indicator (that is, the real-time test data) with a certain adjustment range, and the adjustment range can be 30% to 100% of the last experimental value of the fire extinguishing performance indicator. If the E value of the scoring result of the battery fire extinguishing process is low (for example, E < 70 points), 2 to 3 fire extinguishing performance indicators are adjusted at the same time; if the E value of the scoring result of the battery fire extinguishing process is high (for example, E> 80 points), 1 to 2 fire extinguishing performance indicators can be adjusted, and the adjustment range is also low. The real-time test data of the adjusted fire extinguishing performance indicators needs to be experimentally verified again to confirm whether the comprehensive fire extinguishing effect of the adjusted fire extinguishing performance indicators is reasonable and economical or whether it meets the requirements of the owner. If it is not reasonable and economical, then fine-tune individual fire extinguishing performance indicators until it is appropriate. When adjusting, adjust the experimental value of the fire extinguishing performance indicator according to the linear relationship.

[0105] Step S207: Compare and analyze the corrected fire extinguishing performance indicators with the relevant data groups in the fire extinguishing database to determine the recommended values ​​of the fire extinguishing system design parameters.

[0106] It should be noted that, after the scores of several fire extinguishing performance indicators are adjusted to higher scores according to step S206, these several fire extinguishing performance indicators together with other several unadjusted fire extinguishing performance indicators can be combined to form a group of various fire extinguishing performance indicators after correction and adjustment. By comparing and analyzing the group of various fire extinguishing performance indicators after correction and adjustment with the relevant data families in the fire extinguishing database, the fire extinguishing coefficient design parameters corresponding to the case data with similar fire extinguishing effects as the adjusted fire extinguishing performance indicators can be obtained from the database.

[0107] Exemplarily, the process of comparing and analyzing the corrected fire extinguishing performance indicators with the relevant data families in the fire extinguishing database to determine the recommended values ​​of the fire extinguishing system design parameters includes but is not limited to the following sub-steps S2071 to S2074.

[0108] Sub-step S2071, compare and analyze the corrected temperature field T in the battery compartment, fire extinguishing duration t, fire extinguishing agent injection flow rate m and battery internal temperature value M with the relevant data family in the fire extinguishing database to determine the recommended value of the fire extinguishing agent flow rate, the recommended value of the fire extinguishing agent pressure and the first recommended value of the fire extinguishing agent continuous injection time.

[0109] For example, by analyzing the temperature distribution at multiple points in the battery compartment, the temperature distribution in the high-temperature area of ​​the battery, and the change in fire extinguishing agent consumption over time t, the disposal efficiency of the fire extinguishing system in five stages can be calculated, the effectiveness of the fire extinguishing agent can be judged, and the first recommended values ​​of the fire extinguishing agent flow rate, injection pressure and continuous injection time can be output.

[0110] Sub-step S2072: Compare and analyze the corrected infrared imaging measurement value X, the cabin monitoring image H, the battery internal temperature value M and the fire extinguishing duration t with the relevant data groups in the fire extinguishing database to determine the recommended value for the arrangement of the fire extinguishing agent nozzles and the second recommended value for the continuous injection time of the fire extinguishing agent.

[0111] For example, by analyzing the high temperature area X of the infrared imager, the flame area H of the in-cabin video image, the high temperature area distribution M in the battery and the time progress t, the second recommended value of the fire extinguishing agent nozzle layout and continuous spraying time can be calculated.

[0112] Sub-step S2073, compare and analyze the corrected gas concentration value G in the battery compartment, pressure value P in the battery compartment, smoke concentration value F in the battery compartment, fire extinguishing agent injection flow rate m and fire extinguishing duration t with the relevant data families in the fire extinguishing database to determine the recommended value of the fire extinguishing agent type.

[0113] For example, by analyzing the gas concentration G in the battery compartment, the gas pressure value P in the compartment, the smoke concentration F in the compartment, the fire extinguishing agent consumption and the relationship with the time duration t, the configuration recommendation value of the fire extinguishing agent type can be given.

[0114] Sub-step S2074: determining the larger one of the first recommended value and the second recommended value of the continuous injection time of the fire extinguishing agent as the final recommended value of the continuous injection time of the fire extinguishing agent.

[0115] By combining the multiple recommended values ​​output by the above sub-steps, the application design parameters of the fire extinguishing agent in the energy storage power station can be formed.

[0116] Embodiment 3

[0117] Please refer to Figure 5The third embodiment of the present invention provides a fire extinguishing performance evaluation device for an energy storage battery fire extinguishing system. The evaluation device includes an information acquisition unit 101, an information analysis unit 102 and a fire extinguishing performance evaluation unit 103.

[0118] The information acquisition unit 101 is used to obtain real-time test data of multiple fire extinguishing performance indicators at different fire extinguishing stages after the fire extinguishing test of the energy storage battery fire extinguishing system is completed.

[0119] The information analysis unit 102 is connected to the information acquisition unit 101, and is used to analyze multiple fire extinguishing performance indicators to determine the effective scores and weights. The information analysis unit 102 includes an effective score determination module 1021, a weight value determination module 1022, and a fire extinguishing process analysis module 1023. Among them, the effective score determination module 1021 is connected to the information acquisition unit 101, and is used to compare the real-time test data of each fire extinguishing performance indicator with the corresponding historical reference data to determine the effective score of each fire extinguishing performance indicator. The weight value determination module 1022 is connected to the information acquisition unit 101, and is used to determine the weight value of each fire extinguishing performance indicator. The fire extinguishing process analysis module 1023 is respectively connected to the effective score determination module 1021 and the weight value determination module 1022, and is used to determine the scoring result of the battery fire extinguishing process based on the effective score and weight value of each fire extinguishing performance indicator in the multiple fire extinguishing performance indicators.

[0120] Furthermore, the fire extinguishing process analysis module 1023 includes a judgment submodule 1023a, a first scoring submodule 1023b and a second scoring submodule 1023c. The judgment submodule 1023a is used to judge whether there is at least one fire extinguishing performance indicator with an effective score of 0, and output the judgment result. The first scoring submodule 1023b is used to determine the scoring result of the battery fire extinguishing process as 0 when the judgment result is that there is at least one fire extinguishing performance indicator with an effective score of 0. The second scoring submodule 1023c is used to determine the scoring result of the battery fire extinguishing process as the sum of the products of the effective scores of multiple fire extinguishing performance indicators and the weight values ​​when the judgment result is that the effective scores of all fire extinguishing performance indicators are not 0.

[0121] The fire extinguishing performance evaluation unit 103 is connected to the information analysis unit 102, and is used to determine the evaluation level of the fire handling capability of the fire extinguishing system based on the scoring result of the battery fire extinguishing process. The fire extinguishing performance evaluation unit 103 includes a comparison module 1031, a first evaluation module 1032, a second evaluation module 1033, a third evaluation module 1034, a fourth evaluation module 1035 and a fifth evaluation module 1036. Among them, the comparison module 1031 is used to compare the scoring result of the battery fire extinguishing process with the size of each fire extinguishing performance threshold. The first evaluation module 1032 is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the first fire extinguishing performance level when the scoring result of the battery fire extinguishing process is greater than the first score. The second evaluation module 1033 is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the second fire extinguishing performance level when the scoring result of the battery fire extinguishing process is greater than the second score and less than the first score. The third evaluation module 1034 is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the third fire extinguishing performance level when the scoring result of the battery fire extinguishing process is greater than the third score and less than the second score. The fourth evaluation module 1035 is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the fourth fire extinguishing performance level when the scoring result of the battery fire extinguishing process is greater than the fourth score and less than the third score. The fifth evaluation module 1036 is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the fifth fire extinguishing performance level when the scoring result of the battery fire extinguishing process is less than the fourth score.

[0122] It should be noted that the above-mentioned device only uses the division of the above-mentioned functional modules as an example to illustrate when implementing its functions. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the device provided in the above embodiment and the method provided in the first embodiment belong to the same concept. The specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0123] Embodiment 4

[0124] The fourth embodiment of the present invention provides another fire extinguishing performance evaluation device for an energy storage battery fire extinguishing system. The evaluation device is based on the evaluation device provided in the third embodiment, and a fire extinguishing system design unit is added to the evaluation device.

[0125] Please refer to Figure 6 A fire extinguishing performance evaluation device for an energy storage battery fire extinguishing system includes an information acquisition unit 101, an information analysis unit 102, a fire extinguishing performance evaluation unit 103 and a fire extinguishing system design unit 104.

[0126] The information acquisition unit 101 is used to obtain real-time test data of multiple fire extinguishing performance indicators at different fire extinguishing stages after the fire extinguishing test of the energy storage battery fire extinguishing system is completed.

[0127] The information analysis unit 102 is connected to the information acquisition unit 101, and is used to analyze multiple fire extinguishing performance indicators to determine the effective scores and weights. The information analysis unit 102 includes an effective score determination module 1021, a weight value determination module 1022, and a fire extinguishing process analysis module 1023. Among them, the effective score determination module 1021 is connected to the information acquisition unit 101, and is used to compare the real-time test data of each fire extinguishing performance indicator with the historical reference data to determine the effective score of each fire extinguishing performance indicator. The weight value determination module 1022 is connected to the information acquisition unit 101, and is used to determine the weight value of each fire extinguishing performance indicator. The fire extinguishing process analysis module 1023 is respectively connected to the effective score determination module 1021 and the weight value determination module 1022, and is used to determine the scoring result of the battery fire extinguishing process based on the effective score and weight value of each fire extinguishing performance indicator in the multiple fire extinguishing performance indicators.

[0128] Furthermore, the fire extinguishing process analysis module 1023 includes a judgment submodule 1023a, a first scoring submodule 1023b and a second scoring submodule 1023c. The judgment submodule 1023a is used to judge whether there is at least one fire extinguishing performance indicator with an effective score of 0, and output the judgment result. The first scoring submodule 1023b is used to determine the scoring result of the battery fire extinguishing process as 0 when the judgment result is that there is at least one fire extinguishing performance indicator with an effective score of 0. The second scoring submodule 1023c is used to determine the scoring result of the battery fire extinguishing process as the sum of the products of the effective scores of multiple fire extinguishing performance indicators and the weight values ​​when the judgment result is that the effective scores of all fire extinguishing performance indicators are not 0.

[0129] The fire extinguishing performance evaluation unit 103 is connected to the information analysis unit 102, and is used to determine the evaluation level of the fire handling capability of the fire extinguishing system based on the scoring result of the battery fire extinguishing process. The fire extinguishing performance evaluation unit 103 includes a comparison module 1031, a first evaluation module 1032, a second evaluation module 1033, a third evaluation module 1034, a fourth evaluation module 1035 and a fifth evaluation module 1036. Among them, the comparison module 1031 is used to compare the scoring result of the battery fire extinguishing process with the size of each fire extinguishing performance threshold. The first evaluation module 1032 is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the first fire extinguishing performance level when the scoring result of the battery fire extinguishing process is greater than the first score. The second evaluation module 1033 is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the second fire extinguishing performance level when the scoring result of the battery fire extinguishing process is greater than the second score and less than the first score. The third evaluation module 1034 is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the third fire extinguishing performance level when the scoring result of the battery fire extinguishing process is greater than the third score and less than the second score. The fourth evaluation module 1035 is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the fourth fire extinguishing performance level when the scoring result of the battery fire extinguishing process is greater than the fourth score and less than the third score. The fifth evaluation module 1036 is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the fifth fire extinguishing performance level when the scoring result of the battery fire extinguishing process is less than the fourth score.

[0130] The fire extinguishing system design unit 104 includes a fire extinguishing database 1041, an adjustment module 1042 and a recommended value determination module 1043. The fire extinguishing database 1041 stores experimental data, historical operation data, accident case data and expert experience data of the energy storage battery fire extinguishing process. The adjustment module 1042 is used to obtain multiple corrected fire extinguishing performance indicators by adjusting the effective score of at least one of the multiple fire extinguishing performance indicators. The recommended value determination module 1043 is used to compare and analyze the corrected fire extinguishing performance indicators with the relevant data groups in the fire extinguishing database to determine the recommended values ​​of the fire extinguishing system design parameters.

[0131] It should be noted that the above-mentioned device only uses the division of the above-mentioned functional modules as an example to illustrate when implementing its functions. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the device provided in the above embodiment and the method provided in the second embodiment belong to the same concept. The specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0132] Embodiment 5 The fifth embodiment of the present invention takes a 20-foot energy storage power station as an example to further explain in detail how to evaluate the fire extinguishing performance of the energy storage battery fire extinguishing system and obtain the recommended values ​​of the design parameters of the fire extinguishing agent system according to the evaluation results.

[0133] The energy storage power station provided in this embodiment is a lithium iron phosphate battery. The initial fire disposal strategy for the energy storage battery is as follows: the selected fire extinguishing agent type is fine water mist, and the design parameters of the fine water mist fire extinguishing system are: the supply flow rate of the fine water mist is 14L / s, the injection pressure is 3.0MPa, 8 fine water mist nozzles are evenly distributed, and the continuous injection is 20min. The specific implementation process of the evaluation method of the fire extinguishing performance of the fine water mist fire extinguishing system of the lithium iron phosphate battery is as follows.

[0134] Step 1: Use the initial fire handling strategy to implement a battery fire extinguishing scenario test. After the test, collect real-time data of nine fire extinguishing performance indicators at a frequency of 6 times / min.

[0135] (1) Thermocouples are installed at four different locations in the battery compartment to measure the ambient temperature (T). These four locations include the top and bottom, front and rear ends of the battery compartment.

[0136] (2) A pressure sensor is installed in the battery compartment to measure the pressure value (P).

[0137] (3) Four gas detectors are installed in the battery compartment to measure gas concentration values ​​(G) and detect alkanes, hydrogen fluoride, and hydrogen.

[0138] (4) Four smoke concentration detectors are installed in the cabin to measure the smoke concentration value (F).

[0139] (5) Set up the battery management system (M), sort all battery temperature values ​​from high to low, take the top 5 values, and obtain the position of this data point.

[0140] (6) An infrared imager is installed in the cabin to take the highest temperature value (X) in the image.

[0141] (7) Two video monitors are installed in the cabin to collect images of the batteries in the cabin (H).

[0142] (8) The data acquisition system sets the experimental time and records the duration (t).

[0143] (9) Record the fire extinguishing agent injection flow rate (m).

[0144] Step 2: After the fire extinguishing test, analyze the values ​​of T, P, G, F, M, X, H, t, and m to determine the effective score and weight value of each fire extinguishing performance index (as shown in Table 1).

[0145] Table 1: Initial analysis results of effective scores and weight values ​​of various fire extinguishing performance indicators in the fifth embodiment

[0146] Fire extinguishing performance index Effective score Weight value Temperature field in the battery compartment T 80 0.1 Battery compartment pressure value P 100 0.01 Gas concentration value G in the battery compartment 60 0.05 Smoke concentration value F in the battery compartment 70 0.04 Battery internal temperature value M 100 0.2 Infrared imaging measurement value X 70 0.2 In-cabin monitoring image H 100 0.2 Fire extinguishing duration t 70 0.1 Fire extinguishing agent injection flow m 60 0.1

[0147] Step 3: Calculate the scoring results of the battery fire extinguishing process and determine the evaluation level of the fire handling capability of the fire extinguishing system.

[0148] The scoring result of the battery fire extinguishing process is calculated by multiplying the effective score of each fire extinguishing performance indicator by the weight value and adding them together, which is E=0.1×80+0.01×100+0.05×60+0.04×70+0.2×100+0.2×70+0.2×100+0.1×70+0.1×60=81.8 points. It can be judged that the evaluation level of the fire handling capability of the fire extinguishing system is good.

[0149] Step 4: Compare and analyze the scoring results of the battery fire extinguishing process with the relevant data families in the fire extinguishing database, adjust the effective scores of 1 to 2 fire extinguishing performance indicators, and obtain the revised 9 fire extinguishing performance indicators.

[0150] For example, through comparative analysis, it is found that the scoring result E value of the battery fire extinguishing process is relatively high, but the effective scores of the gas concentration value G in the battery compartment and the fire extinguishing agent injection flow rate m are relatively low. You can choose to increase the effective scores of the gas concentration value G in the battery compartment and the fire extinguishing agent injection flow rate m.

[0151] Step 5: Divide all the revised fire extinguishing performance indicators into three groups for calculation, and compare the calculated values ​​of each group with the database information in the fire database, and make a comprehensive judgment to determine the recommended values ​​of the fire extinguishing system design parameters.

[0152] The first group is f1(T, t, m, M), which analyzes the temperature distribution at multiple points in the battery compartment, the temperature distribution in the high-temperature area of ​​the battery, and the change in the consumption of fire extinguishing agent with time t, calculates the disposal efficiency of the fire extinguishing system in 5 stages, judges the effectiveness of the fire extinguishing agent, and outputs the first recommended values ​​of the fire extinguishing agent flow rate, injection pressure and continuous injection time.

[0153] The second group is f2 (X, H, M, t), which analyzes the high temperature area X of the infrared imager, the flame area H of the video image in the cabin, the high temperature area distribution M in the battery, and the time progress t, and calculates the recommended values ​​of the arrangement of the fire extinguishing agent nozzles and the continuous injection time. The continuous injection time of f1 and f2 takes the maximum value.

[0154] The third group is f3 (G, P, F, m, t), which analyzes the gas concentration G in the battery compartment, the gas pressure value P in the compartment, the smoke concentration F in the compartment, the fire extinguishing agent consumption and their relationship with the time duration t, and gives the recommended configuration value of the fire extinguishing agent type.

[0155] After comparing and analyzing the database information in the fire database, the final recommended values ​​for the fire extinguishing system design are: the supply flow rate of fine water mist is 18-20L / s, the injection pressure is 3.0MPa, 12 fine water mist nozzles are evenly distributed, and the continuous injection is 35-45min.

[0156] Step 6: Implement the battery fire extinguishing scenario test again according to the recommended values ​​of the fire extinguishing system design, conduct a second test and fire performance evaluation to verify whether the adjusted fire extinguishing effect is reasonable and economical or whether it meets the owner's requirements.

[0157] The secondary analysis results of the revised effective scores and weight values ​​of various fire extinguishing performance indicators are shown in Table 2. After using the revised recommended values ​​for fire extinguishing system design to handle the fire, the scoring result of the battery fire extinguishing process is recalculated as E=0.1×90+0.01×100+0.05×65+0.04×74+0.2×100+0.2×80+0.2×100+0.1×80+0.1×70=87.21 points.

[0158] Table 2 Secondary analysis results of effective scores and weight values ​​of various fire extinguishing performance indicators in the fifth embodiment

[0159] Fire extinguishing performance index Effective score Weight value Temperature field in the battery compartment T 890 0.1 Battery compartment pressure value P 100 0.01 Gas concentration value G in the battery compartment 665 0.05 Smoke concentration value F in the battery compartment 774 0.04 Battery internal temperature value M 100 0.2 Infrared imaging measurement value X 780 0.2 In-cabin monitoring image H 100 0.2 Fire extinguishing duration t 780 0.1 Fire extinguishing agent injection flow m 670 0.1

[0160] It can be seen that after adjustment, the infrared imaging score and the cabin ambient temperature score increased, indicating that the cooling effect was enhanced after increasing the water mist flow rate, which was helpful for fire extinguishing. The cabin smoke concentration measurement score increased, indicating that the water mist with increased flow rate enhanced the smoke elimination ability.

[0161] This shows that fine water mist can effectively improve fire extinguishing capabilities by optimizing design parameters, and has obvious effects on smoke elimination, environmental cooling, etc.

[0162] Embodiment 6

[0163] The sixth embodiment of the present invention takes a 20-foot energy storage power station as an example to further explain in detail how to evaluate the fire extinguishing performance of the energy storage battery fire extinguishing system and obtain the recommended values ​​of the fire extinguishing agent system design parameters based on the evaluation results.

[0164] The energy storage power station provided in this embodiment is a lithium iron phosphate battery. The initial fire disposal strategy for the energy storage battery is as follows: the selected fire extinguishing agent type is heptafluoropropane, and the design parameters of the heptafluoropropane fire extinguishing system are: the supply flow rate of heptafluoropropane is 3kg / s, the injection pressure is 1.6MPa, 12 nozzles are evenly distributed, and the continuous injection is 120s. The specific implementation process of the evaluation method of the fire extinguishing performance of the heptafluoropropane fire extinguishing system of the lithium iron phosphate battery is as follows.

[0165] Step 1: Use the initial fire handling strategy to implement a battery fire extinguishing scenario test. After the test, collect real-time data of nine fire extinguishing performance indicators at a frequency of 6 times / min.

[0166] (1) Thermocouples are installed at four different locations in the battery compartment to measure the ambient temperature (T). These four locations include the top and bottom, front and rear ends of the battery compartment.

[0167] (2) A pressure sensor is installed in the battery compartment to measure the pressure value (P).

[0168] (3) Four gas detectors are installed in the battery compartment to measure gas concentration values ​​(G) and detect alkanes, hydrogen fluoride, and hydrogen.

[0169] (4) Four smoke concentration detectors are installed in the cabin to measure the smoke concentration value (F).

[0170] (5) Set up the battery management system (M), sort all battery temperature values ​​from high to low, take the top 5 values, and obtain the position of this data point.

[0171] (6) An infrared imager is installed in the cabin to take the highest temperature value (X) in the image.

[0172] (7) Two video monitors are installed in the cabin to collect images of the batteries in the cabin (H).

[0173] (8) The data acquisition system sets the experimental time and records the duration (t).

[0174] (9) Record the fire extinguishing agent injection flow rate (m).

[0175] Step 2: After the fire extinguishing test, analyze the values ​​of T, P, G, F, M, X, H, t, and m to determine the effective score and weight value of each fire extinguishing performance index (as shown in Table 3).

[0176] Table 3 Initial analysis results of effective scores and weight values ​​of various fire extinguishing performance indicators in the sixth embodiment

[0177]

[0178]

[0179] Step 3: Calculate the scoring results of the battery fire extinguishing process and determine the evaluation level of the fire handling capability of the fire extinguishing system.

[0180] The scoring result of the battery fire extinguishing process is calculated by multiplying the effective score of each fire extinguishing performance indicator by the weight value and adding them together, which is E=0.2×60+0.05×80+0.04×70+0.01×60+0.1×80+0.2×70+0.2×80+0.1×60+0.1×60=69.4 points. It can be judged that the evaluation level of the fire handling capability of the fire extinguishing system is poor.

[0181] Step 4: Compare and analyze the scoring results of the battery fire extinguishing process with the relevant data families in the fire extinguishing database, adjust the effective scores of 2 to 3 fire extinguishing performance indicators, and obtain the revised 9 fire extinguishing performance indicators.

[0182] For example, through comparative analysis, it is found that the scoring result E value of the battery fire extinguishing process is low, and the effective scores of the temperature field T in the battery compartment, the smoke concentration value F in the battery compartment and the fire extinguishing agent injection flow rate m are low. You can choose to increase the effective scores of these fire extinguishing performance indicators.

[0183] Step 5: Divide all the revised fire extinguishing performance indicators into three groups for calculation, and compare the calculated values ​​of each group with the database information in the fire database, and make a comprehensive judgment to determine the recommended values ​​of the fire extinguishing system design parameters.

[0184] After comparing and analyzing the database information with the fire database, the final recommended values ​​for the fire extinguishing system design are: the supply flow rate of heptafluoropropane is 6kg / s, the injection pressure is 2.0~2.4MPa, 12 nozzles are evenly distributed, and the continuous injection is 240s.

[0185] Step 6: Implement the battery fire extinguishing scenario test again according to the recommended values ​​of the fire extinguishing system design, conduct a second test and fire performance evaluation to verify whether the adjusted fire extinguishing effect is reasonable and economical or whether it meets the owner's requirements.

[0186] The secondary analysis results of the revised effective scores and weight values ​​of various fire extinguishing performance indicators are shown in Table 4. After using the revised recommended values ​​for fire extinguishing system design to handle the fire, the scoring result of the battery fire extinguishing process is recalculated: E = 0.2 × 60 + 0.05 × 75 + 0.04 × 65 + 0.01 × 68 + 0.1 × 85 + 0.2 × 75 + 0.2 × 85 + 0.1 × 65 + 0.1 × 65 = 72.53 points.

[0187] Table 4 Secondary analysis results of effective scores and weight values ​​of various fire extinguishing performance indicators in the sixth embodiment

[0188] Fire extinguishing performance index Effective score Weight value Temperature field in the battery compartment T 60 0.2 Battery compartment pressure value P 75 0.05 Gas concentration value G in the battery compartment 65 0.04 Smoke concentration value F in the battery compartment 68 0.01 Battery internal temperature value M 85 0.1 Infrared imaging measurement value X 75 0.2 In-cabin monitoring image H 85 0.2 Fire extinguishing duration t 65 0.1 Fire extinguishing agent injection flow m 65 0.1

[0189] It can be seen that after the adjustment, the pressure value in the cabin decreased, indicating that the excessive amount of heptafluoropropane caused more gas to be released during the fire extinguishing process, causing overpressure in the cabin and posing a hidden danger; the gas concentration value in the cabin decreased, indicating that the thermal decomposition of heptafluoropropane itself during the fire extinguishing process produced a large amount of gas, causing gas accumulation in the cabin and increased concentration; the scores in other aspects were significantly improved.

[0190] From the revised test data, after increasing the HFC-227ea fire extinguishing flow rate, the fire extinguishing capacity is significantly improved, which helps to control the fire, but it does not improve the cooling operation, and causes the gas concentration and pressure in the cabin to increase, which is not conducive to fire fighting. Overall, a good fire extinguishing capacity is achieved. However, it should be noted that the consumption of HFC-227ea increases by 4 times after the increase. From the perspective of engineering application, this design parameter is not economical, the fire fighting investment cost is too high, and the cost performance is not high. It can be seen that HFC-227ea is not an ideal fire extinguishing choice for energy storage battery fire extinguishing.

[0191] Embodiment 7

[0192] The seventh embodiment of the present invention takes a 20-foot energy storage power station as an example to further explain in detail how to evaluate the fire extinguishing performance of the energy storage battery fire extinguishing system and obtain the recommended values ​​of the fire extinguishing agent system design parameters based on the evaluation results.

[0193] The energy storage power station provided in this embodiment is a lithium iron phosphate battery. The initial fire disposal strategy for the energy storage battery is as follows: the selected fire extinguishing agent type is compressed gas foam, and the design parameters of the compressed gas foam fire extinguishing system are: the supply flow rate of the foam mixture is 30L / s, the injection pressure is 0.6MPa, 10 nozzles are evenly distributed, and the continuous injection is 20min. The specific implementation process of the evaluation method of the fire extinguishing performance of the compressed gas foam fire extinguishing system of the lithium iron phosphate battery is as follows.

[0194] Step 1: Use the initial fire handling strategy to implement a battery fire extinguishing scenario test. After the test, collect real-time data of nine fire extinguishing performance indicators at a frequency of 3 times / min.

[0195] (1) Thermocouples are installed at four different locations in the battery compartment to measure the ambient temperature (T). These four locations include the top and bottom, front and rear ends of the battery compartment.

[0196] (2) A pressure sensor is installed in the battery compartment to measure the pressure value (P).

[0197] (3) Four gas detectors are installed in the battery compartment to measure gas concentration values ​​(G) and detect alkanes, hydrogen fluoride, and hydrogen.

[0198] (4) Four smoke concentration detectors are installed in the cabin to measure the smoke concentration value (F).

[0199] (5) Set up the battery management system (M), sort all battery temperature values ​​from high to low, take the top 5 values, and obtain the position of this data point.

[0200] (6) An infrared imager is installed in the cabin to take the highest temperature value (X) in the image.

[0201] (7) Two video monitors are installed in the cabin to collect images of the batteries in the cabin (H).

[0202] (8) The data acquisition system sets the experimental time and records the duration (t).

[0203] (9) Record the fire extinguishing agent injection flow rate (m).

[0204] Step 2: After the fire extinguishing test, analyze the values ​​of T, P, G, F, M, X, H, t, and m to determine the effective score and weight value of each fire extinguishing performance index (as shown in Table 5).

[0205] Table 5: Initial analysis results of effective scores and weight values ​​of various fire extinguishing performance indicators in the seventh embodiment

[0206] Fire extinguishing performance index Effective score Weight value Temperature field in the battery compartment T 85 0.2 Battery compartment pressure value P 95 0.02 Gas concentration value G in the battery compartment 65 0.02 Smoke concentration value F in the battery compartment 90 0.06 Battery internal temperature value M 90 0.1 Infrared imaging measurement value X 95 0.2 In-cabin monitoring image H 97 0.2 Fire extinguishing duration t 85 0.1 Fire extinguishing agent injection flow m 80 0.1

[0207] Step 3: Calculate the scoring results of the battery fire extinguishing process and determine the evaluation level of the fire handling capability of the fire extinguishing system.

[0208] The scoring result of the battery fire extinguishing process is calculated by multiplying the effective score of each fire extinguishing performance indicator by the weight value and adding them together, which is E=0.2×85+0.02×95+0.02×65+0.06×90+0.1×90+0.2×95+0.2×97+0.1×85+0.1×80=92.3 points. It can be judged that the evaluation level of the fire handling capability of the fire extinguishing system is excellent.

[0209] Step 4: Compare and analyze the scoring results of the battery fire extinguishing process with the relevant data families in the fire extinguishing database, adjust the effective score of one fire extinguishing performance indicator, and obtain the revised 9 fire extinguishing performance indicators.

[0210] For example, through comparative analysis, it is found that the scoring result E value of the battery fire extinguishing process is relatively high, but the effective score of the gas concentration value G in the battery compartment is relatively low. You can choose to increase the effective score of this fire extinguishing performance indicator.

[0211] Step 5: Divide all the revised fire extinguishing performance indicators into three groups for calculation, and compare the calculated values ​​of each group with the database information in the fire database, and make a comprehensive judgment to determine the recommended values ​​of the fire extinguishing system design parameters.

[0212] After comparing and analyzing the database information with the fire database, the final output of the fire extinguishing system design recommended values ​​are: the supply flow rate of the foam mixture is 40L / s, the injection pressure is 0.6MPa, 10 nozzles are evenly distributed, and the continuous injection is 30min.

[0213] Step 6: Implement the battery fire extinguishing scenario test again according to the recommended values ​​of the fire extinguishing system design, conduct a second test and fire performance evaluation to verify whether the adjusted fire extinguishing effect is reasonable and economical or whether it meets the owner's requirements.

[0214] The secondary analysis results of the revised effective scores and weight values ​​of various fire extinguishing performance indicators are shown in Table 6. After using the revised recommended values ​​for fire extinguishing system design to handle the fire, the scoring result of the battery fire extinguishing process obtained by recalculation is E=0.2×90+0.02×95+0.02×70+0.06×95+0.1×95+0.2×97+0.2×97+0.1×90+0.1×80=93.3 points.

[0215] Table 6 Secondary analysis results of effective scores and weight values ​​of various fire extinguishing performance indicators in the seventh embodiment

[0216] Fire extinguishing performance index Effective score Weight value Temperature field in the battery compartment T 90 0.2 Battery compartment pressure value P 95 0.02 Gas concentration value G in the battery compartment 70 0.02 Smoke concentration value F in the battery compartment 95 0.06 Battery internal temperature value M 95 0.1 Infrared imaging measurement value X 97 0.2 In-cabin monitoring image H 97 0.2 Fire extinguishing duration t 85 0.1 Fire extinguishing agent injection flow m 80 0.1

[0217] It can be seen that after adjustment, the ambient temperature value, smoke concentration value, battery management system, infrared imaging measurement value, etc. are significantly improved, indicating that the cooling effect of compressed gas foam is significantly enhanced with the increase of injection flow rate, but the cabin pressure value and gas concentration value change little. The main reason is that the compressed gas foam fire extinguishing process does not produce gas, which has little effect on these two factors.

[0218] It can be seen that compressed gas foam is an ideal choice for energy storage battery fire extinguishing.

[0219] Embodiment 8

[0220] The eighth embodiment of the present invention takes a 20-foot energy storage power station as an example to further explain in detail how to evaluate the fire extinguishing performance of the energy storage battery fire extinguishing system and obtain the recommended values ​​of the fire extinguishing agent system design parameters based on the evaluation results.

[0221] The energy storage power station provided in this embodiment is a lithium iron phosphate battery. The initial fire disposal strategy for the energy storage battery is as follows: the selected fire extinguishing agent type is fire water, and the design parameters of the water sprinkler fire extinguishing system are: the supply flow rate of fire water is 50L / s, the injection pressure is 0.4MPa, 12 nozzles are evenly distributed, and the continuous injection is 30min. The specific implementation process of the evaluation method of the fire extinguishing performance of the water sprinkler fire extinguishing system of the lithium iron phosphate battery is as follows.

[0222] Step 1: Use the initial fire handling strategy to implement a battery fire extinguishing scenario test. After the test, collect real-time data of nine fire extinguishing performance indicators at a frequency of 3 times / min.

[0223] (1) Thermocouples are installed at four different locations in the battery compartment to measure the ambient temperature (T). These four locations include the top and bottom, front and rear ends of the battery compartment.

[0224] (2) A pressure sensor is installed in the battery compartment to measure the pressure value (P).

[0225] (3) Four gas detectors are installed in the battery compartment to measure gas concentration values ​​(G) and detect alkanes, hydrogen fluoride, and hydrogen.

[0226] (4) Four smoke concentration detectors are installed in the cabin to measure the smoke concentration value (F).

[0227] (5) Set up the battery management system (M), sort all battery temperature values ​​from high to low, take the top 5 values, and obtain the position of this data point.

[0228] (6) An infrared imager is installed in the cabin to take the highest temperature value (X) in the image.

[0229] (7) Two video monitors are installed in the cabin to collect images of the batteries in the cabin (H).

[0230] (8) The data acquisition system sets the experimental time and records the duration (t).

[0231] (9) Record the fire extinguishing agent injection flow rate (m).

[0232] Step 2: After the fire extinguishing test, analyze the values ​​of T, P, G, F, M, X, H, t, and m to determine the effective score and weight value of each fire extinguishing performance indicator (as shown in Table 7).

[0233] Table 7 Initial analysis results of effective scores and weight values ​​of various fire extinguishing performance indicators in the eighth embodiment

[0234] Fire extinguishing performance index Effective score Weight value Temperature field in the battery compartment T 80 0.2 Battery compartment pressure value P 90 0.02 Gas concentration value G in the battery compartment 75 0.02 Smoke concentration value F in the battery compartment 80 0.06 Battery internal temperature value M 85 0.1 Infrared imaging measurement value X 85 0.2 In-cabin monitoring image H 90 0.2 Fire extinguishing duration t 65 0.1 Fire extinguishing agent injection flow m 70 0.1

[0235] Step 3: Calculate the scoring results of the battery fire extinguishing process and determine the evaluation level of the fire handling capability of the fire extinguishing system.

[0236] The scoring result of the battery fire extinguishing process is calculated by multiplying the effective score of each fire extinguishing performance indicator by the weight value and adding them together, which is E=0.2×80+0.02×90+0.02×75+0.06×80+0.1×85+0.2×85+0.2×90+0.1×65+0.1×70=81.1 points. It can be judged that the evaluation level of the fire handling capability of the fire extinguishing system is good.

[0237] Step 4: Compare and analyze the scoring results of the battery fire extinguishing process with the relevant data families in the fire extinguishing database, adjust the effective scores of 1 to 2 fire extinguishing performance indicators, and obtain the revised 9 fire extinguishing performance indicators.

[0238] For example, through comparative analysis, it is found that the scoring result E value of the battery fire extinguishing process is relatively high, but the effective scores of the fire extinguishing agent injection flow rate m and duration t are relatively low. It is possible to choose to increase the effective scores of these two fire extinguishing performance indicators.

[0239] Step 5: Divide all the revised fire extinguishing performance indicators into three groups for calculation, and compare the calculated values ​​of each group with the database information in the fire database, and make a comprehensive judgment to determine the recommended values ​​of the fire extinguishing system design parameters.

[0240] After comparing and analyzing the database information with the fire database, the final output of the fire extinguishing system design recommended values ​​are: the fire water supply flow rate is 60L / s, the injection pressure is 0.6MPa, 16 nozzles are evenly distributed, and the continuous injection is 40min.

[0241] Step 6: Implement the battery fire extinguishing scenario test again according to the recommended values ​​of the fire extinguishing system design, conduct a second test and fire performance evaluation to verify whether the adjusted fire extinguishing effect is reasonable and economical or whether it meets the owner's requirements.

[0242] The secondary analysis results of the revised effective scores and weight values ​​of various fire extinguishing performance indicators are shown in Table 8. After using the revised recommended values ​​for fire extinguishing system design to handle the fire, the scoring result of the battery fire extinguishing process is recalculated as E = 0.2 × 90 + 0.02 × 90 + 0.02 × 75 + 0.06 × 80 + 0.1 × 90 + 0.2 × 90 + 0.2 × 95 + 0.1 × 75 + 0.1 × 80 = 87.6 points.

[0243] Table 8 Secondary analysis results of effective scores and weight values ​​of various fire extinguishing performance indicators in the eighth embodiment

[0244] Fire extinguishing performance index Effective score Weight value Temperature field in the battery compartment T 90 0.2 Battery compartment pressure value P 90 0.02 Gas concentration value G in the battery compartment 75 0.02 Smoke concentration value F in the battery compartment 80 0.06 Battery internal temperature value M 90 0.1 Infrared imaging measurement value X 90 0.2 In-cabin monitoring image H 95 0.2 Fire extinguishing duration t 75 0.1 Fire extinguishing agent injection flow m 80 0.1

[0245] It can be seen that after adjustment, the ambient temperature value, smoke concentration value, battery management system, infrared imaging measurement value, etc. have all been significantly improved, indicating that the cooling effect of cooling water spray has been significantly enhanced with the increase of injection flow, but the cabin pressure value and gas concentration value have changed little. The main reason is that the cooling process does not produce gas, which has little effect on these two factors. In addition, after significantly increasing the flow rate and injection time, the fire extinguishing effect has been significantly improved, but the flow rate is too large, which is difficult to achieve in engineering and is not economical for energy storage power station fire extinguishing.

[0246] It can be seen that fire water is an ideal coolant for energy storage battery fire extinguishing, but it is not an ideal choice for the overall fire extinguishing effect.

[0247] Embodiment 9

[0248] The ninth embodiment of the present invention further provides an electronic device, see Figure 7 The electronic device includes a processor 201 and a memory 202, wherein at least one computer program is stored in the memory, and the at least one computer program is loaded and executed by one or more of the above processors to enable the computer to implement the fire extinguishing performance evaluation method as described above.

[0249] Of course, the electronic device may also have components such as a wired or wireless network interface, a keyboard, and an input / output interface for input and output. The electronic device may also include other components for realizing various functions of the device, which will not be described in detail here.

[0250] Embodiment 10

[0251] The tenth embodiment of the present invention further provides a computer-readable storage medium, in which at least one program code is stored. The program code is loaded and executed by a processor to enable a computer to implement the fire extinguishing performance evaluation method as described above.

[0252] Optionally, the computer readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc (CD-ROM), a magnetic tape, a floppy disk, and an optical disc data storage device. Those skilled in the art may understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including several instructions to enable a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disc, and other media that can store program codes.

[0253] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0254] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0255] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for evaluating the fire extinguishing performance of an energy storage battery fire extinguishing system, characterized in that: The evaluation method includes: After the fire extinguishing test of the energy storage battery fire extinguishing system is completed, real-time test data of multiple fire extinguishing performance indicators at different fire extinguishing stages are obtained, and the multiple fire extinguishing performance indicators include the temperature field in the battery compartment, the gas concentration value in the battery compartment, the smoke concentration value in the battery compartment and the internal temperature value of the battery; Compare the real-time test data of each fire extinguishing performance indicator with the corresponding historical reference data to determine the effective score of each fire extinguishing performance indicator; Determine the weight value of each fire extinguishing performance indicator; Determine the scoring result of the battery fire extinguishing process based on the effective score and weight value of each fire extinguishing performance indicator among the multiple fire extinguishing performance indicators; Based on the scoring results of the battery fire extinguishing process, the evaluation level of the fire handling capability of the fire extinguishing system is determined.

2. The fire extinguishing performance evaluation method of the energy storage battery fire extinguishing system according to claim 1, characterized in that: The multiple fire extinguishing performance indicators also include: pressure value in the battery compartment, infrared imaging measurement value, in-cabin monitoring image, fire extinguishing agent injection flow rate and fire extinguishing duration.

3. The fire extinguishing performance evaluation method of the energy storage battery fire extinguishing system according to claim 1, characterized in that: The scoring result of the battery fire extinguishing process is determined based on the effective score and weight value of each fire extinguishing performance indicator in the multiple fire extinguishing performance indicators, including: Determine whether there is at least one fire extinguishing performance indicator with a valid score of 0; If yes, the score result of the battery fire extinguishing process is determined to be 0; If not, the sum of the products of the effective scores and weight values ​​of the multiple fire extinguishing performance indicators is determined as the scoring result of the battery fire extinguishing process.

4. The fire extinguishing performance evaluation method of the energy storage battery fire extinguishing system according to claim 1, characterized in that: The evaluation level of the fire handling capability of the fire extinguishing system is determined based on the scoring result of the battery fire extinguishing process, including: Compare the scoring results of the battery fire extinguishing process with the values ​​of each fire extinguishing performance threshold; If the score result of the battery fire extinguishing process is greater than the first score, it is determined to be the first fire extinguishing performance level; If the score result of the battery fire extinguishing process is greater than the second score value and less than the first score value, it is determined to be the second fire extinguishing performance level; If the score result of the battery fire extinguishing process is greater than the third score value and less than the second score value, it is determined to be the third fire extinguishing performance level; If the score result of the battery fire extinguishing process is greater than the fourth score value and less than the third score value, it is determined to be the fourth fire extinguishing performance level; If the score result of the battery fire extinguishing process is less than the fourth score value, it is determined to be the fifth fire extinguishing performance level; The fire handling capability of the first fire extinguishing performance level is better than that of the second fire extinguishing performance level, the fire handling capability of the second fire extinguishing performance level is better than that of the third fire extinguishing performance level, the fire handling capability of the third fire extinguishing performance level is better than that of the fourth fire extinguishing performance level, and the fire handling capability of the fourth fire extinguishing performance level is better than that of the fifth fire extinguishing performance level; The first score is greater than the second score, the second score is greater than the third score, and the third score is greater than the fourth score.

5. The fire extinguishing performance evaluation method of the energy storage battery fire extinguishing system according to claim 2, characterized in that: The evaluation method further comprises: By adjusting the effective score of at least one fire extinguishing performance indicator among the multiple fire extinguishing performance indicators, the corrected fire extinguishing performance indicators are obtained; The revised fire extinguishing performance indicators are compared and analyzed with the relevant data groups in the fire extinguishing database to determine the recommended values ​​of the fire extinguishing system design parameters; the fire extinguishing database stores the experimental data, historical operation data, accident case data and expert experience data of the energy storage battery fire extinguishing process.

6. The method for evaluating the fire extinguishing performance of the energy storage battery fire extinguishing system according to claim 5, characterized in that: The modified fire extinguishing performance indicators are compared and analyzed with the relevant data groups in the fire extinguishing database to determine the recommended values ​​of the fire extinguishing system design parameters, including: Compare and analyze the corrected temperature field in the battery compartment, fire extinguishing duration, extinguishing agent injection flow rate and battery internal temperature value with the relevant data family in the fire extinguishing database to determine the recommended value of extinguishing agent flow rate, the recommended value of extinguishing agent pressure and the first recommended value of extinguishing agent continuous injection time; Compare and analyze the corrected infrared imaging measurement values, cabin monitoring images, battery internal temperature values ​​and fire extinguishing duration with the relevant data sets in the fire extinguishing database to determine the recommended value for the arrangement of the fire extinguishing agent nozzles and the second recommended value for the continuous injection time of the fire extinguishing agent; Compare and analyze the corrected gas concentration value, pressure value, smoke concentration value, extinguishing agent injection flow rate and fire extinguishing duration in the battery compartment with the relevant data families in the fire extinguishing database to determine the recommended value of the extinguishing agent type; The larger one of the first recommended value and the second recommended value of the continuous injection time of the fire extinguishing agent is determined as the final recommended value of the continuous injection time of the fire extinguishing agent.

7. A fire extinguishing performance evaluation device for an energy storage battery fire extinguishing system, characterized in that: The evaluation device includes an information acquisition unit, an information analysis unit and a fire extinguishing performance evaluation unit; The information acquisition unit is used to obtain real-time test data of multiple fire extinguishing performance indicators at different fire extinguishing stages after the fire extinguishing test of the energy storage battery fire extinguishing system is completed; The information analysis unit includes an effective score determination module, a weight value determination module and a fire extinguishing process analysis module; wherein, The effective score determination module is used to compare the real-time test data of each fire extinguishing performance indicator with the corresponding historical reference data to determine the effective score of each fire extinguishing performance indicator; The weight value determination module is used to determine the weight value of each fire extinguishing performance indicator; The fire extinguishing process analysis module is used to determine the scoring result of the battery fire extinguishing process based on the effective score and weight value of each fire extinguishing performance indicator in the multiple fire extinguishing performance indicators; The fire extinguishing performance evaluation unit is used to determine the evaluation level of the fire handling capability of the fire extinguishing system based on the scoring result of the battery fire extinguishing process.

8. The fire extinguishing performance evaluation device of the energy storage battery fire extinguishing system according to claim 7, characterized in that: The fire extinguishing process analysis module includes a judgment submodule, a first dozen submodule and a second dozen submodule; The judgment submodule is used to judge whether there is at least one fire extinguishing performance indicator with a valid score of 0, and output the judgment result; The first scoring submodule is used to determine the scoring result of the battery fire extinguishing process as 0 when the judgment result is that the effective score of at least one fire extinguishing performance indicator is 0; The second scoring submodule is used to determine the scoring result of the battery fire extinguishing process as the sum of the products of the effective scores of multiple fire extinguishing performance indicators and the weight values ​​when the judgment result is that the effective scores of all fire extinguishing performance indicators are not 0.

9. The fire extinguishing performance evaluation device of the energy storage battery fire extinguishing system according to claim 7, characterized in that: The fire extinguishing performance evaluation unit includes a comparison module, a first evaluation module, a second evaluation module, a third evaluation module, a fourth evaluation module and a fifth evaluation module; The comparison module is used to compare the scoring result of the battery fire extinguishing process with the size of each fire extinguishing performance threshold; The first evaluation module is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the first fire extinguishing performance level when the scoring result of the battery fire extinguishing process is greater than the first score; The second evaluation module is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the second fire extinguishing performance level when the scoring result of the battery fire extinguishing process is greater than the second score and less than the first score; The third evaluation module is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the third fire extinguishing performance level when the scoring result of the battery fire extinguishing process is greater than the third score and less than the second score; The fourth evaluation module is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the fourth fire extinguishing performance level when the scoring result of the battery fire extinguishing process is greater than the fourth score and less than the third score; The fifth evaluation module is used to determine the evaluation level of the fire handling capability of the fire extinguishing system as the fifth fire extinguishing performance level when the scoring result of the battery fire extinguishing process is less than the fourth score value; Among them, the fire handling capability of the first fire extinguishing performance level is better than that of the second fire extinguishing performance level, the fire handling capability of the second fire extinguishing performance level is better than that of the third fire extinguishing performance level, the fire handling capability of the third fire extinguishing performance level is better than that of the fourth fire extinguishing performance level, and the fire handling capability of the fourth fire extinguishing performance level is better than the fifth fire extinguishing performance level; the first score is greater than the second score, the second score is greater than the third score, and the third score is greater than the fourth score.

10. The fire extinguishing performance evaluation device of the energy storage battery fire extinguishing system according to claim 7, characterized in that: The evaluation device also includes a fire extinguishing system design unit, which includes a fire extinguishing database, an adjustment module, and a recommended value determination module; The fire extinguishing database stores experimental data, historical operation data, accident case data and expert experience data of the energy storage battery fire extinguishing process; The adjustment module is used to obtain the corrected fire extinguishing performance indicators by adjusting the effective score of at least one fire extinguishing performance indicator among the multiple fire extinguishing performance indicators; The recommended value determination module is used to compare and analyze the corrected fire extinguishing performance indicators with the relevant data groups in the fire extinguishing database to determine the recommended values ​​of the fire extinguishing system design parameters.

11. An electronic device, characterized in that: The electronic device comprises a processor and a memory, wherein at least one computer program is stored in the memory, and the at least one computer program is loaded and executed by one or more of the processors, so that the computer implements the fire extinguishing performance evaluation method according to any one of claims 1 to 6.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one program code, and the program code is loaded and executed by a processor so that a computer implements the fire extinguishing performance evaluation method according to any one of claims 1 to 6.

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