Thermal runaway treatment system

Abstract

The utility model provides a thermal runaway treatment system which is used for conveying fire extinguishing media into a plurality of energy storage containers in an energy storage power station, each energy storage container comprises a plurality of batteries, and a thermal runaway energy storage system comprises temperature detection pieces, a temperature sensor, a controller and a controller, the liquid nitrogen storage device is connected with the battery and is used for introducing a fire extinguishing medium into a shell of the battery; the liquid nitrogen storage tank comprises a containing cylinder storing liquid nitrogen and further comprises a covering cylinder arranged outside the containing cylinder in a sleeving mode, a heat insulation space is formed between the covering cylinder and the containing cylinder, the liquid nitrogen storage tank is communicated with the energy storage container through the liquid nitrogen conveying pipeline, and the liquid nitrogen storage device further comprises a controller connected with the temperature detection part and a liquid nitrogen storage device. The problem that a battery in the prior art is prone to thermal runaway is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium iron phosphate battery technical field, specifically, relate to a thermal runaway processing system. BACKGROUND

[0002] In lithium phosphate battery fire, available fire extinguishing medium includes gas, solid and liquid, in gas fire extinguishing medium aspect, hexafluoropropane, heptafluoropropane, perfluoroheptanone can be used for inhibiting and extinguishing lithium battery fire, in solid fire extinguishing medium aspect, dry powder fire extinguishing apparatus has certain effect, liquid fire extinguishing medium includes water and foam fire extinguisher.

[0003] In the prior art battery energy storage system, the battery is easy to catch fire under the condition of high temperature, causing fire, and the thermal runaway of the battery refers to the heat generation rate of the internal chemical reaction of the battery being much higher than the heat dissipation rate, and a large amount of heat accumulates in the battery, causing the temperature of the battery to rise rapidly, if effective control measures are not taken in the early stage of thermal runaway, the battery is easy to catch fire or explode, thereby causing economic and property losses. UTILITY MODEL CONTENTS

[0004] The main purpose of the utility model is to provide a thermal runaway processing system to solve the problem that the lithium iron phosphate battery in the prior art is prone to fire and difficult to extinguish in time, and thermal runaway occurs.

[0005] In order to achieve the above purpose, according to one aspect of the utility model, a thermal runaway processing system is provided, which is used for conveying fire extinguishing medium into a plurality of energy storage containers in an energy storage power station, each energy storage container includes a plurality of batteries, and the thermal runaway processing system comprises:

[0006] The temperature detection member is arranged in the battery;

[0007] The liquid nitrogen storage device comprises a liquid nitrogen storage tank, and the liquid nitrogen storage tank comprises:

[0008] The containing cylinder stores liquid nitrogen in the containing cylinder;

[0009] The cover cylinder is sleeved outside the containing cylinder, and a heat insulation space is formed between the inner wall of the cover cylinder and the outer wall of the containing cylinder;

[0010] The liquid nitrogen conveying pipeline communicates the liquid nitrogen storage tank with the energy storage container, so as to introduce the fire extinguishing medium into the energy storage container;

[0011] The controller is connected with the temperature detection member and the liquid nitrogen storage device.

[0012] Further, the liquid nitrogen storage device further comprises:

[0013] A vacuumizing unit is in communication with the heat insulation space through a vacuum pipe and is configured to vacuumize the heat insulation space.

[0014] Further, the thermal runaway processing system further comprises:

[0015] The liquid air energy storage system comprises a liquid air storage device and a compressed heat storage device.

[0016] The compressed heat storage device is connected to the liquid air storage device, and the liquid air storage device is in communication with the liquid nitrogen storage device.

[0017] Further, the thermal runaway processing system further comprises:

[0018] The liquid nitrogen separation device is arranged between the liquid air storage device and the liquid nitrogen storage device.

[0019] Further, the liquid nitrogen separation device comprises:

[0020] The first evaporator is connected to the liquid air storage device at an inlet thereof, and is configured to evaporate a product of the liquid air storage device at a preset temperature.

[0021] The post-processing unit is connected to the first gas-liquid separation unit.

[0022] Further, the post-processing unit comprises:

[0023] The booster pump is in communication with the outlet of the first gas-liquid separation unit.

[0024] The first temperature and pressure sensor is arranged at an outlet of the first heat exchanger.

[0025] The second gas-liquid separation unit is connected to the first temperature and pressure sensor, and is in communication with the liquid nitrogen storage device and the booster pump.

[0026] Further, the compressed heat storage device comprises:

[0027] The air purification unit is connected to the outlet of the booster.

[0028] The booster is connected to the outlet of the air purification unit.

[0029] Further, the liquid air storage device comprises:

[0030] The compressed heat storage unit is connected to the booster.

[0031] The heat exchanger is in communication with the compressed heat storage unit.

[0032] A second temperature and pressure sensor is provided at the outlet of the heat exchanger;

[0033] A gas-liquid separator is connected to an outlet of the heat exchanger.

[0034] Furthermore, the thermal runaway processing system further includes a cryogenic pump connected to the liquid air storage device.

[0035] Furthermore, the post-processing unit further includes:

[0036] The cold storage unit is communicated with the outlet of the second evaporator and is connected to the controller. The outlet end of the cold storage unit can be selectively communicated with the heat exchanger, the liquid nitrogen storage tank and the first heat exchanger.

[0037] Furthermore, a temperature sensor is provided in the liquid nitrogen storage tank, and the temperature sensor is connected to the controller.

[0038] Furthermore, the thermal runaway treatment system further includes:

[0039] The expansion generator is communicated with the outlet of the second evaporator.

[0040] Furthermore, the liquid nitrogen storage tank is also provided with:

[0041] Liquid level sensor, the liquid level sensor is connected with the controller.

[0042] By applying the technical solution of the present invention, during use, the temperature detection element detects the real-time temperature inside the battery and sends the detected result to the controller for judgment. When the controller determines that the real-time temperature is greater than the critical temperature, it indicates that the battery may be at risk of thermal runaway. Therefore, the controller will control the liquid nitrogen storage device to introduce a fire extinguishing medium into the battery shell to avoid thermal runaway of the battery. The device provided in this application can timely inject a fire extinguishing medium into the battery shell when the temperature of the battery reaches the minimum temperature of thermal runaway, thereby avoiding thermal runaway of the battery in advance. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0044] Figure 1 A schematic diagram of a liquid air energy storage system in a thermal runaway processing system according to an embodiment of the present invention is shown;

[0045] Figure 2 A schematic diagram of a liquid nitrogen storage device in a thermal runaway treatment system provided in an embodiment of the present application is shown;

[0046] Figure 3 The schematic diagram of the liquid nitrogen separation device in the thermal runaway processing system provided by the embodiment of the application.

[0047] Among them, the above figure includes the following reference signs:

[0048] 1, liquid nitrogen storage tank; 101, containing cylinder; 102, cover cylinder; 2, liquid nitrogen conveying pipeline; 3, vacuum pumping unit; 4, liquid nitrogen separation device; 5, evaporator; 6, primary gas-liquid separation unit; 7, booster pump; 8, first heat exchanger; 9, first temperature and pressure sensor; 10, secondary gas-liquid separation unit; 11, liquid nitrogen storage device; 12, air purification unit; 13, supercharger; 14, compressed heat storage unit; 15, second heat exchanger; 16, second temperature and pressure sensor; 17, gas-liquid separator; 18, liquid air storage device; 19, liquid air energy storage system; 20, energy storage power station; 21, cryogenic pump; 22, evaporator; 23, cold storage unit; 24, expansion generator; 25, controller; 26, liquid level sensor; 27, temperature sensor. DETAILED DESCRIPTION

[0049] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0050] In the lithium phosphate battery fire, the available fire extinguishing medium includes gas, solid and liquid; in terms of gas fire extinguishing medium, hexafluoropropene, heptafluoropropene and perfluoroheptanone can be used to suppress and extinguish lithium battery fire, in terms of solid fire extinguishing medium, dry powder fire extinguishing device has certain effect, and liquid fire extinguishing medium includes water and foam fire extinguishing device.

[0051] In the existing battery energy storage system, the battery is easy to catch fire in the case of high temperature, causing fire, and the thermal runaway of the battery means that the heat generation rate of the internal chemical reaction of the battery is much higher than the heat dissipation rate, and a large amount of heat accumulates in the battery, causing the temperature of the battery to rise rapidly. If effective control measures are not taken in the early stage of thermal runaway, the battery is easy to catch fire or explode, thereby causing economic and property losses.

[0052] The main purpose of the present application is to provide a thermal runaway processing system and a liquid nitrogen fire extinguishing method, so as to solve the problem that the lithium iron phosphate battery in the prior art is easy to catch fire and difficult to extinguish in time, and the thermal runaway problem.

[0053] Embodiment 1

[0054] The embodiment of the application first provides a thermal runaway processing system, which is used for conveying fire extinguishing medium into a plurality of energy storage containers in an energy storage power station 20, and the thermal runaway processing system comprises:

[0055] A temperature detection component is used to be set in the energy storage container to detect the real-time temperature inside the energy storage container;

[0056] A liquid nitrogen storage device 11 is connected to the energy storage container to be used for introducing a fire extinguishing medium into the energy storage container;

[0057] The controller 25 is connected to the temperature detection element and the liquid nitrogen storage device 11 to control the liquid nitrogen storage device 11 to inject a fire extinguishing medium into the energy storage power station 20 when the real-time temperature is greater than the critical temperature. The fire extinguishing medium is liquid nitrogen.

[0058] The energy storage station 20 includes several energy storage containers or outdoor energy storage cabinets, in which multiple batteries are installed. The multiple batteries are connected together in series. The following description only uses the energy storage container as an example, but the thermal runaway treatment system of the present application is not limited to being applicable to the energy storage station 20;

[0059] like Figures 1 to 3 As shown, the embodiment of the present application first provides a thermal runaway management system, which is used to deliver a fire extinguishing medium into an energy storage container to extinguish a fire. The thermal runaway management system includes: a temperature detection element provided on each battery in each energy storage container in the energy storage station 20, which is used to detect the real-time temperature inside each battery in each energy storage container in the energy storage station 20; a liquid nitrogen storage device 11 connected to the energy storage container, which is used to introduce the fire extinguishing medium into the energy storage station 20; and a controller 25 respectively connected to the temperature detection element and the liquid nitrogen storage device 11. When the temperature detection element detects that the real-time temperature of the battery is greater than a critical temperature, which is the minimum temperature at which the battery in the energy storage container experiences thermal runaway, the liquid nitrogen storage device 11 is controlled to introduce the fire extinguishing medium into the energy storage container to prevent the battery in the energy storage container from experiencing thermal runaway.

[0060] During use, the temperature detection element detects the real-time temperature of the batteries in the energy storage container and sends the detected result to the controller 25 for judgment. When the controller 25 determines that the real-time temperature is greater than the critical temperature, it indicates that the batteries in several energy storage containers in the energy storage power station 20 may be at risk of thermal runaway. Therefore, the controller 25 will control the liquid nitrogen storage device 11 to pass a fire extinguishing medium into the energy storage container to prevent the batteries in the energy storage container from thermal runaway. The device provided in the present application can promptly inject a fire extinguishing medium into the energy storage container when the battery temperature reaches the minimum temperature for thermal runaway, thereby preventing the batteries in the energy storage container from thermal runaway in advance.

[0061] Furthermore, the liquid nitrogen storage device 11 further includes: a liquid nitrogen storage tank 1 , in which liquid nitrogen is stored;

[0062] A liquid nitrogen delivery pipeline 2 is in communication with the liquid nitrogen storage tank 1 and the battery, and is used to deliver the liquid nitrogen in the liquid nitrogen storage tank 1 to the inside of the energy storage container.

[0063] Specifically, as shown in Figure 2 The liquid nitrogen storage device 11 includes a liquid nitrogen storage tank 1 for storing liquid nitrogen, and a liquid nitrogen delivery pipeline 2 in communication with the liquid nitrogen storage tank. The other end of the liquid nitrogen delivery pipeline 2 is in communication with the energy storage container. When the temperature of the battery in the energy storage container reaches the critical temperature, the liquid nitrogen enters the liquid nitrogen delivery pipeline 2 from the liquid nitrogen storage tank 1, and then enters the inside of the energy storage container from the liquid nitrogen delivery pipeline 2, thereby lowering the temperature of the battery in advance and avoiding the risk of continuous temperature rise and thermal runaway of the battery.

[0064] Further, the liquid nitrogen storage tank 1 includes a containing cylinder 101 in which the liquid nitrogen is stored.

[0065] A cover cylinder 102 is arranged outside the containing cylinder 101, and a heat insulation space is formed between the inner wall of the cover cylinder 102 and the outer wall of the containing cylinder 101.

[0066] Specifically, the liquid nitrogen storage tank 1 includes a containing cylinder 101 for storing liquid nitrogen, and a cover cylinder 102 arranged outside the containing cylinder 101. A heat insulation space is formed between the inner wall of the cover cylinder 102 and the outer wall of the containing cylinder 101. The heat insulation space is used to insulate the heat from the outside environment from the liquid nitrogen in the containing cylinder 101, thereby avoiding the temperature rise of the liquid nitrogen in the containing cylinder 101 due to the temperature of the outside environment, and preventing the liquid nitrogen from being delivered into the energy storage container to lower the temperature of the battery and cause the thermal runaway phenomenon.

[0067] Further, the liquid nitrogen storage device 11 further includes a vacuum pumping unit in communication with the heat insulation space through a vacuum pipeline, and used to pump the heat insulation space when the containing cylinder 101 stores the liquid nitrogen, so as to form a vacuum region in the heat insulation space.

[0068] Specifically, as shown in Figure 2 The liquid nitrogen storage device 11 further includes a vacuum pumping unit in communication with the heat insulation space through a vacuum pipeline. When the containing cylinder 101 stores the liquid nitrogen, the vacuum pumping unit is used to pump the heat insulation space, so that the heat insulation space in the vacuum state insulates the temperature of the outside environment. The heat insulation space in the vacuum state can effectively prevent the invasion of the heat from the outside environment. The temperature of the outside environment is usually higher than the temperature of the liquid nitrogen. If there is no heat insulation space, the heat will quickly conduct to the inside of the containing cylinder 101, causing a large amount of evaporation of the liquid nitrogen, increasing the loss and affecting the storage effect.

[0069] Secondly, the vacuum environment helps to reduce the weight of the liquid nitrogen storage tank 1 itself. Compared with using thick thermal insulation materials to prevent heat transfer, using vacuum insulation can reduce the weight of the tank body of the liquid nitrogen storage tank 1 itself while achieving the same insulation effect, making it easier to move and operate. Finally, being in a vacuum state can also improve the safety of the liquid nitrogen storage tank 1, reducing the heat transfer and reducing the pressure accumulation of the liquid nitrogen due to temperature rise, reducing the potential risk of explosion.

[0070] The thermal runaway treatment system further comprises a liquid air energy storage system 19, wherein the liquid air energy storage system 19 comprises a liquid air storage device 18 and a compressed heat storage device for processing air;

[0071] As shown in Figure 1 the compressed heat storage device is connected to the liquid air storage device 18 to input the product obtained by processing air by the compressed heat storage device into the liquid air storage device 18, so that the liquid air storage device 18 processes the product output by the compressed heat storage device to obtain a first mixture in a liquid state, and the liquid air storage device 18 is in communication with the liquid nitrogen storage device 11 to deliver the first mixture to the liquid nitrogen storage device 11.

[0072] Specifically, the thermal runaway treatment system further comprises a liquid air energy storage system 19, wherein the liquid air energy storage system 19 comprises a liquid air storage device 18 and a compressed heat storage device, the compressed heat storage device is used for processing air and inputting the product obtained by processing air into the liquid air storage device 18, so that the liquid air storage device 18 processes the product output by the compressed heat storage device to obtain a first mixture, the first mixture is in a liquid state, and the first mixture comprises liquid nitrogen and liquid oxygen, wherein the liquid air storage device 18 is in communication with the liquid nitrogen storage device 11 and inputs the obtained first mixture into the liquid nitrogen storage device 11 for storage, so as to be used at any time.

[0073] Further, the thermal runaway treatment system further comprises a liquid nitrogen separation device 4, which is arranged between the liquid air storage device 18 and the liquid nitrogen storage device 11, and is used for processing the first mixture to obtain liquid nitrogen and delivering the obtained liquid nitrogen to the liquid nitrogen storage device 11.

[0074] Specifically, the thermal runaway treatment system further comprises a liquid nitrogen separation device 4 arranged between the liquid air storage device 18 and the liquid nitrogen storage device 11, and the liquid nitrogen separation device 4 is used for processing the first mixture, and the product obtained after processing is liquid nitrogen.

[0075] Further, the liquid nitrogen separation device 4 comprises:

[0076] a first evaporator 5, an inlet of the first evaporator 5 being connected with the liquid air storage device 18, the first evaporator 5 being used to evaporate the first mixture at a preset temperature to obtain a second mixture containing gas and liquid, an outlet of the first evaporator 5 being connected with a primary gas-liquid separation unit 6, the primary gas-liquid separation unit 6 being used to separate the gas and the liquid in the second mixture and to deliver the liquid in the second mixture to the liquid air energy storage system;

[0077] a post-processing unit, the post-processing unit being connected with the primary gas-liquid separation unit 6, the post-processing unit being used to post-process the gas in the second mixture to obtain liquid nitrogen.

[0078] Specifically, as shown in Figure 3 the liquid nitrogen separation device 4 includes the first evaporator 5, an inlet of the first evaporator 5 being connected with the liquid air storage system, the first evaporator 5 being used to evaporate the first mixture at a preset temperature to obtain a second mixture containing gas and liquid, the preset temperature being the temperature at which liquid nitrogen forms nitrogen gas, wherein the gas is nitrogen gas and the liquid is liquid oxygen, an outlet of the first evaporator 5 being connected with the primary gas-liquid separation unit 6, the primary gas-liquid separation unit 6 being used to separate the gas and the liquid in the second mixture and to deliver the liquid in the second mixture to the liquid air energy storage system, the primary gas-liquid separation unit 6 further being connected with the post-processing unit, the primary gas-liquid separation unit 6 inputting the gas in the second mixture to the post-processing unit, the post-processing unit processing the gas in the second mixture and obtaining liquid nitrogen.

[0079] Further, the post-processing unit includes the booster pump 7, an inlet of the booster pump 7 being connected with an outlet of the primary gas-liquid separation unit 6, the booster pump 7 being used to initially boost the gas in the second mixture and to input the product obtained after the boosting to the first heat exchanger 8 for cooling treatment;

[0080] the first temperature and pressure sensor 9, the first temperature and pressure sensor 9 being arranged at the outlet of the first heat exchanger 8 and being used to detect a first real-time temperature of the liquid output from the outlet of the first heat exchanger 8, so as to determine whether the liquid is liquid nitrogen according to the first real-time temperature;

[0081] the secondary gas-liquid separation unit 10, the secondary gas-liquid separation unit 10 being connected with the outlet of the first heat exchanger 8 and being used to separate the liquid nitrogen flowing out of the first heat exchanger 8 when the liquid output from the outlet of the first heat exchanger 8 is liquid nitrogen; wherein the secondary gas-liquid separation unit 10 is connected with the liquid nitrogen storage device 11 and the booster pump 7 respectively, so as to deliver the obtained liquid to the liquid nitrogen storage device 11 and to deliver the obtained gas to the booster pump 7.

[0082] Specifically, the post-processing unit comprises a booster pump 7, an inlet of the booster pump 7 being communicated with an outlet of the primary gas-liquid separation unit 6, when the primary gas-liquid separation unit 6 inputs the gas in the second mixture into the booster pump 7, the booster pump 7 performs a primary pressurization treatment on the gas in the second mixture, facilitating subsequent cooling and liquefaction, and inputs the product after pressurization into the first heat exchanger 8 for cooling treatment, the temperature of the product after pressurization being reduced to the sublimation point of nitrogen to preliminarily form liquid nitrogen, and a first temperature and pressure sensor 9 is further arranged at the outlet of the first heat exchanger 8, the first temperature and pressure sensor 9 being used to detect a first real-time temperature of the liquid output from the first heat exchanger 8, and to determine whether the output liquid is liquid nitrogen according to the first real-time temperature, because the temperature of liquid nitrogen is greatly different from that of liquid oxygen, the temperature of the liquid detected by the first temperature and pressure sensor 9 can be used for the determination, and the outlet of the first heat exchanger 8 is further connected with a secondary gas-liquid separation unit 10, when the first temperature and pressure sensor 9 detects that the liquid output from the outlet of the first heat exchanger 8 is nitrogen, the output nitrogen is input into the secondary gas-liquid separation unit 10, and the liquid nitrogen is further subjected to gas-liquid separation by the secondary gas-liquid separation unit 10, because the primary separation cannot completely separate the gas and liquid, part of the gas remains in the liquid after the separation by the primary gas-liquid separation unit 6, and the secondary gas-liquid separation unit 10 is used to separate the remaining part of the gas from the liquid, wherein the secondary gas-liquid separation unit 10 is communicated with a liquid nitrogen storage device 11 and the booster pump 7, the liquid separated by the secondary gas-liquid separation unit 10 is input into the liquid nitrogen storage device 11, and the gas separated by the secondary gas-liquid separation unit 10 is input into the booster pump 7, and the booster pump 7 continues to treat the gas.

[0083] The compressed heat storage device comprises: an air purification unit 12, which is used to remove water and carbon dioxide in air to obtain mixed gas;

[0084] A booster 13 connected with the outlet of the air purification unit 12 to pressurize the mixed gas to obtain compressed gas, the form of the compressed gas including gas and liquid.

[0085] Specifically, the compressed heat storage device comprises the air purification unit 12, air in the outside world is transported into the air purification unit 12 through a pump and a pipeline, the air purification unit 12 is used to remove high-boiling-point substances in air, the high-boiling-point substances mainly being water and carbon dioxide, to avoid the freezing of water and carbon dioxide from damaging the subsequent equipment, the outlet of the air purification unit 12 being communicated with the booster 13, the air purification unit 12 transporting the product after purification to the booster 13 for pressurization treatment, and obtaining compressed gas, wherein the form of the compressed gas includes gas and liquid, facilitating subsequent cooling and liquefaction.

[0086] Further, the liquid air storage device 18 comprises:

[0087] a compression heat storage unit 14 connected with the supercharger 13 to absorb heat generated in the process of supercharging the mixed gas by the supercharger 13 and store the heat to increase the power generation of the liquid air energy storage system 19;

[0088] a second heat exchanger 15 connected with the compression heat storage unit 14 to reduce the temperature of the compressed gas to a set temperature;

[0089] a second temperature and pressure sensor 16 arranged at the outlet of the second heat exchanger 15 to detect the second real-time temperature of the product output from the second heat exchanger 15;

[0090] a gas-liquid separator 17 connected with the outlet of the second heat exchanger 15 to separate the product output from the second heat exchanger 15 into gas and liquid when the second real-time temperature is lower than the set temperature, wherein the second heat exchanger 15 is connected with the liquid air energy storage system 19 and the supercharger 13 respectively to send the separated liquid to the liquid air energy storage system 19 and send the separated gas to the supercharger 13 for supercharging the gas again.

[0091] Specifically, the liquid air storage device includes the compression heat storage unit 14, the supercharger 13 is connected with the compression heat storage unit 14, a large amount of heat is generated in the process of supercharging the mixed gas by the supercharger 13, the compression heat storage unit 14 is used to collect and store the heat generated in the process of supercharging, the stored heat can be used to increase the power generation of the liquid air energy storage system 19, the outlet of the compression heat storage unit 14 is connected with the second heat exchanger 15, the second heat exchanger 15 is used to reduce the temperature of the compressed gas to a set temperature, the second temperature and pressure sensor 16 is arranged at the outlet of the second heat exchanger 15 to detect the second real-time temperature of the product after heat exchange by the second heat exchanger 15, the second heat exchanger 15 is connected with the liquid air energy storage system 19 and the supercharger 13 respectively, the gas-liquid separator 17 inputs the separated liquid to the liquid air energy storage system 19 and inputs the separated gas to the supercharger 13 for supercharging the gas again by the supercharger 13 when the second real-time temperature of the product output from the second heat exchanger 15 is lower than the set temperature.

[0092] The heat runaway processing system further includes a cryogenic pump 21 connected with the liquid air storage device 18 to extract liquid air from the liquid air storage device 18 when the liquid air energy storage system 19 is in the energy releasing state and send the extracted air to a second evaporator 22 to convert the liquid air into gaseous air.

[0093] Specifically, the thermal runaway treatment system further comprises a cryogenic pump 21 in communication with the liquid air storage device 18, when the liquid air energy storage system 19 is in the energy releasing state, the cryogenic pump 21 extracts the liquid air from the liquid air energy storage system 19 and delivers the extracted air to the second evaporator 22, and the liquid air is evaporated by the second evaporator 22 to convert the liquid air into gaseous air.

[0094] The post-processing unit further comprises a cold storage unit 23, the cold storage unit 23 is in communication with the outlet of the second evaporator 22 and is connected with the controller 25 to absorb and store the cold energy generated when the liquid air is evaporated by the second evaporator 22, and the outlet end of the cold storage unit 23 is selectively in communication with the second heat exchanger 15, the liquid nitrogen storage tank 1 and the first heat exchanger 8 to deliver the stored cold energy to the second heat exchanger 15 for cooling the compressed gas, or to the liquid nitrogen storage tank 1 for cooling the liquid nitrogen in the liquid nitrogen storage tank 1, or to the first heat exchanger 8 for cooling the product of the booster pump 7.

[0095] Specifically, the post-processing unit further comprises a cold storage unit 23, the cold storage unit 23 is in communication with the outlet of the second evaporator 22 and is connected with the controller 25 to absorb and store the cold energy generated when the liquid air is evaporated by the second evaporator 22, and the outlet end of the cold storage unit 23 is selectively in communication with the second heat exchanger 15, the liquid nitrogen storage tank 1 and the first heat exchanger 8 to deliver the stored cold energy to the second heat exchanger 15 for cooling the compressed gas, or to the liquid nitrogen storage tank 1 for cooling the liquid nitrogen in the liquid nitrogen storage tank 1, or to the first heat exchanger 8 for cooling the product of the booster pump 7.

[0096] The temperature sensor 27 is arranged in the liquid nitrogen storage tank 1 and is connected with the controller 25, and the temperature sensor 27 is used to detect the temperature of the liquid nitrogen in the liquid nitrogen storage tank 1, so that when the temperature of the liquid nitrogen in the liquid nitrogen storage tank 1 is lower than the set value of the liquid nitrogen temperature, the controller 25 controls the cold storage unit 23 to deliver cold energy to the liquid nitrogen storage tank 1.

[0097] Specifically, the temperature sensor 27 is arranged in the liquid nitrogen storage tank 1, and the temperature sensor 27 is connected with the controller 25. The temperature sensor 27 is used to detect the temperature of the liquid nitrogen in the liquid nitrogen storage tank 1. When the temperature of the liquid nitrogen is lower than the set value of the temperature of the liquid nitrogen, the controller 25 controls the cold storage unit 23 to deliver cold energy to the liquid nitrogen storage tank 1, so as to ensure that the temperature of the liquid nitrogen in the liquid nitrogen storage tank 1 is always lower than the set value of the temperature of the liquid nitrogen.

[0098] The thermal runaway treatment system further comprises an expansion generator 24, which is in communication with the outlet of the second evaporator 22, so as to generate electricity by using gaseous air.

[0099] Specifically, the thermal runaway treatment system further comprises the expansion generator 24, which is in communication with the outlet of the second evaporator 22, so that the expansion generator 24 can generate electricity by using the gas output at the outlet of the second evaporator 22.

[0100] The liquid level sensor 26 is arranged in the liquid nitrogen storage tank 1, and the liquid level sensor 26 is connected with the controller 25. The liquid level sensor 26 is used to detect the real-time liquid level of the liquid nitrogen in the liquid nitrogen storage tank 1. When the real-time liquid level is less than the preset liquid level, the controller 25 controls the liquid nitrogen separation device 4 to deliver liquid nitrogen into the liquid nitrogen storage tank 1.

[0101] Specifically, the liquid level sensor 26 is arranged in the liquid nitrogen storage tank 1, and the liquid level sensor 26 is connected with the controller 25. The liquid level sensor 26 is used to detect the real-time liquid level of the liquid nitrogen in the liquid nitrogen storage tank 1. When the real-time liquid level is less than the preset liquid level, the controller 25 controls the liquid nitrogen separation device 4 to deliver liquid nitrogen into the liquid nitrogen storage tank 1, until the real-time liquid level in the liquid nitrogen storage tank 1 is greater than or equal to the preset liquid level, so as to ensure that there is enough liquid nitrogen to avoid the occurrence of thermal runaway when the battery is about to have thermal runaway.

[0102] Embodiment 2

[0103] On the basis of the embodiment 1, the application further provides a liquid nitrogen extinguishing method. The liquid nitrogen extinguishing method is suitable for the thermal runaway treatment system, and the liquid nitrogen extinguishing method comprises the following steps: acquiring the real-time temperature of the battery in the energy storage container of the energy storage power station; when the real-time temperature is greater than the critical temperature, controlling the valve on the liquid nitrogen delivery pipeline to be opened, so as to deliver liquid nitrogen into the energy storage container, and avoid the phenomenon of thermal runaway of the battery.

[0104] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects: in the use process, air is input into the air purification unit 12 for purification to remove water and carbon dioxide in the air, avoid water and carbon dioxide icing to damage the subsequent equipment, the product obtained after purification by the air purification unit 12 is input into the supercharger 13 for supercharging, and compressed gas is obtained, the compressed gas obtained presents gaseous and liquid state, because the supercharger 13 cannot compress all the gas to form liquid at one time, so a part of gaseous state will be contained in the compressed gas obtained, the supercharger 13 is further connected with the compression heat storage unit 14, the compression heat storage unit 14 is used for absorbing the heat generated in the compression process of the supercharger 13 and storing, to use the heat stored to increase the power generation of the liquid air energy storage system 19, the compression heat storage unit 14 is further connected with the second heat exchanger 15, the second heat exchanger 15 is used for reducing the temperature of the compressed gas to the set temperature, the second temperature and pressure sensor 16 is arranged at the outlet of the second heat exchanger 15, the second temperature and pressure sensor 16 is used for detecting whether the temperature of the compressed gas from the second heat exchanger 15 is less than the set temperature, if not, the part of compressed gas needs to be input into the second heat exchanger 15 again for heat exchange, if yes, the compressed gas is input into the gas-liquid separator 17 for gas-liquid separation, and the separated liquid is transported into the liquid air energy storage system 19, and the separated gas is transported into the supercharger 13 to perform supercharging treatment again, the liquid in the liquid air energy storage system 19 is transported into the liquid nitrogen separation device 4, the liquid is separated into gas and liquid by the liquid nitrogen separation device 4, specifically, the liquid is transported into the first evaporator 5 in the liquid nitrogen separation device 4, evaporated by the first evaporator 5, a second mixture containing gas and liquid is obtained, and the product obtained after evaporation is transported into the first-stage gas-liquid separation unit 6 to separate the product into gas and liquid, the obtained liquid is transported into the liquid air energy storage system, the gas obtained after evaporation is transported into the supercharging pump 7, the supercharging pump 7 performs primary supercharging on the gas, and the product after supercharging is input into the first heat exchanger 8 for temperature reduction treatment, facilitating subsequent liquefaction, the first temperature and pressure sensor 9 is used for detecting the first real-time temperature of the liquid output from the outlet of the first heat exchanger 8, when judging as liquid nitrogen, the liquid is transported into the second-stage gas-liquid separation unit 10 to separate again, the obtained liquid is transported into the liquid nitrogen storage device 11 for storage, and the obtained gas is transported into the supercharging pump 7 for treatment, the liquid air storage device 18 is further connected with the low-temperature pump 21, when the liquid air energy storage system 19 is in the energy release state, liquid air needs to be extracted from the liquid air storage device 18 and transported into the second evaporator 22 to convert the liquid air into gaseous air, the outlet of the second evaporator 22 is connected with the cold storage unit 23,The cold storage unit 23 can deliver the stored cold energy to the second heat exchanger 15, the first heat exchanger 8 and the liquid nitrogen storage tank 1 to cool the liquid nitrogen in the liquid nitrogen storage tank 1, and a temperature sensor 27 is arranged in the liquid nitrogen storage tank 1, when the temperature of the liquid nitrogen is lower than the set value of the liquid nitrogen temperature, the controller 25 controls the cold storage unit 23 to deliver cold energy into the liquid nitrogen storage tank 1 to maintain the temperature of the liquid nitrogen, and a liquid level sensor 26 is also arranged in the liquid nitrogen storage tank 1 to detect the real-time liquid level in the liquid nitrogen storage tank 1, when the real-time liquid level is less than the preset liquid level, the controller 25 controls the liquid nitrogen separation device 4 to deliver liquid nitrogen into the liquid nitrogen storage tank 1 to ensure that there is enough liquid nitrogen to be injected into the inside of the energy storage container when the battery temperature reaches the critical temperature, so as to avoid the phenomenon of thermal runaway of the batteries in the energy storage container.

[0105] It is to be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0106] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application, unless otherwise specifically stated. It is to be understood that the drawings are not necessarily to scale as the dimensions of the parts shown are for the purpose of providing an understanding of the example embodiments. Technical, methods, and apparatuses known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as if the discussion were incorporated herein and been part of the present disclosure. In the examples shown and discussed herein, any specific values are to be interpreted as illustrative only and not limiting. Thus, other examples of example embodiments can have different values. It is to be noted that like numbers and letters refer to like elements throughout the several views of the drawings and that, as such, detailed descriptions of these elements are not necessary in each disclosure where these elements are discussed.

[0107] In the description of the present application, it is to be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0108] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0109] In addition, it should be noted that the use of "first", "second", and the like words of resemblance to limit parts, only for the convenience of the corresponding parts are distinguished, such as no other declaration, the above words have no special meaning, therefore can not be understood as the limitation of the scope of protection of the utility model.

[0110] The above only is the preferred embodiment of the utility model, and does not limit the utility model, and for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A thermal runaway treatment system, characterized in that: The thermal runaway processing system is used to deliver a fire extinguishing medium to a plurality of energy storage containers in an energy storage power station (20), each of the energy storage containers comprising a plurality of batteries, and the thermal runaway processing system comprises: a temperature detecting element, configured to be disposed in the battery; A liquid nitrogen storage device (11), the liquid nitrogen storage device (11) comprising a liquid nitrogen storage tank (1), the liquid nitrogen storage tank (1) comprising: a accommodating cylinder (101), wherein the liquid nitrogen is stored in the accommodating cylinder (101); A covering cylinder (102), wherein the covering cylinder (102) is sleeved on the outside of the accommodating cylinder (101), and a heat-insulating space is formed between the inner wall of the covering cylinder (102) and the outer wall of the accommodating cylinder (101); a liquid nitrogen delivery pipeline (2), the liquid nitrogen delivery pipeline (2) connecting the liquid nitrogen storage tank (1) with the energy storage container so as to introduce a fire extinguishing medium into the energy storage container; A controller (25), the controller (25) being connected to the temperature detection element and the liquid nitrogen storage device (11).

2. The thermal runaway treatment system according to claim 1, characterized in that: The liquid nitrogen storage device (11) further comprises: A vacuum pumping unit is connected to the heat-insulating space through a vacuum pipe and is used to vacuum the heat-insulating space.

3. The thermal runaway treatment system according to claim 2, characterized in that: The thermal runaway treatment system further comprises: A liquid air energy storage system (19), wherein the liquid air energy storage system (19) comprises a liquid air storage device (18) and a compression heat storage device; The compressed heat storage device is connected to the liquid air storage device (18), and the liquid air storage device (18) is connected to the liquid nitrogen storage device (11).

4. The thermal runaway treatment system according to claim 3, characterized in that: The thermal runaway treatment system further comprises: A liquid nitrogen separation device (4), wherein the liquid nitrogen separation device (4) is arranged between the liquid air storage device (18) and the liquid nitrogen storage device (11).

5. The thermal runaway treatment system according to claim 4, characterized in that: The liquid nitrogen separation device comprises: a first evaporator (5), wherein the inlet of the first evaporator (5) is connected to the liquid air storage device (18) and is used to evaporate the product of the liquid air storage device (18) at a preset temperature, and the outlet of the first evaporator (5) is connected to a primary gas-liquid separation unit (6); A post-processing unit is connected to the primary gas-liquid separation unit (6).

6. The thermal runaway treatment system according to claim 5, characterized in that: The post-processing unit comprises: a booster pump (7), wherein the inlet of the booster pump (7) is connected to the outlet of the primary gas-liquid separation unit (6); a first temperature and pressure sensor (9), the first temperature and pressure sensor (9) being arranged at the outlet of the first heat exchanger (8); A secondary gas-liquid separation unit (10), the secondary gas-liquid separation unit (10) being connected to the first temperature and pressure sensor (9); wherein the secondary gas-liquid separation unit (10) is respectively connected to the liquid nitrogen storage device (11) and the booster pump (7).

7. The thermal runaway treatment system according to claim 6, characterized in that: The compression heat storage device comprises: Air purification unit (12); A supercharger (13), the supercharger (13) being connected to an outlet of the air purification unit (12).

8. The thermal runaway treatment system according to claim 7, characterized in that: The liquid air storage device (18) comprises: a compression heat storage unit (14), the compression heat storage unit (14) being connected to the booster (13); a heat exchanger (15), the heat exchanger (15) being in communication with the compression heat storage unit (14); a second temperature and pressure sensor (16), the second temperature and pressure sensor (16) being arranged at the outlet of the heat exchanger (15); A gas-liquid separator (17), wherein the gas-liquid separator (17) is in communication with an outlet of the heat exchanger (15).

9. The thermal runaway treatment system according to claim 8, characterized in that: The thermal runaway treatment system further includes a cryogenic pump (21) in communication with the liquid air storage device (18).

10. The thermal runaway treatment system according to claim 9, characterized in that: The post-processing unit further includes: A cold storage unit (23), the cold storage unit (23) is in communication with the outlet of the second evaporator (22) and is connected to the controller (25), and the outlet end of the cold storage unit (23) can be selectively in communication with the heat exchanger (15), the liquid nitrogen storage tank (1), and the first heat exchanger (8).

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