Energy storage system, control method thereof, computing device, storage medium and program product

Abstract

The invention provides an energy storage system and a control method thereof, computing equipment, a storage medium and a program product, and belongs to the field of energy storage. The energy storage system comprises an energy storage device, a first detection unit, a high-pressure gas storage tank, a low-pressure gas storage tank and a control unit; a battery device of the energy storage device is accommodated in an accommodating cavity of the cabinet body; the first detection unit is at least used for detecting the smoke concentration in the accommodating cavity and sending a detection signal; the control unit is configured to obtain the detection signal, determine smoldering of the battery device in response to the detection signal meeting a first preset condition, and control the high-pressure gas storage tank to inject the first inert gas into the containing cavity, so that the oxygen concentration in the containing cavity is lower than a safety threshold value, and the possibility of flame combustion can be reduced. And then the low-pressure gas storage tank is controlled to inject the second inert gas into the containing cavity, so that the oxygen concentration in the containing cavity is maintained below the safety threshold value, the re-combustion possibility is reduced, the battery device in thermal runaway is spontaneously combusted, and the reliability of the energy storage system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and in particular, to an energy storage system, a control method thereof, a computing device, a storage medium, and a program product. Background Art

[0002] With the increasing demand for energy consumption, home energy storage and large-scale energy storage technologies have gradually emerged. Taking an energy storage system as an example, a large number of battery devices are provided in the energy storage system, and electric energy can be stored as needed and output at an appropriate time.

[0003] Thermal runaway may occur during long-term operation of the battery. When thermal runaway occurs in the battery, it will cause fire accidents such as combustion and explosion, thereby affecting the reliability of the energy storage system. How to improve the reliability of the energy storage system has become an urgent problem to be solved. Summary of the Invention

[0004] The present application aims to at least solve one of the technical problems existing in the background art. To this end, an object of the present application is to provide an energy storage system, a control method thereof, a computing device, a storage medium, and a program product, so as to improve the reliability of the energy storage system.

[0005] An embodiment of the first aspect of the present application provides an energy storage system, including: an energy storage device, a first detection unit, a high-pressure gas storage tank, a low-pressure gas storage tank, and a control unit. The energy storage device includes a cabinet body and a battery device. The cabinet body has a receiving cavity, and the battery device is received in the receiving cavity. The first detection unit is at least used to detect the smoke concentration in the receiving cavity and send out a detection signal, and the detection signal at least includes a smoke concentration signal. The high-pressure gas storage tank is communicated with the receiving cavity through a first gas path, and the first gas path can be opened and closed. The low-pressure gas storage tank is communicated with the receiving cavity through a second gas path, and the second gas path can be opened and closed. The control unit is configured to obtain the detection signal, and in response to the detection signal satisfying a first preset condition, determine that the battery device is smoldering, control the first gas path to be conducted and the second gas path to be cut off, so that the high-pressure gas storage tank injects a first inert gas into the receiving cavity, making the oxygen concentration in the receiving cavity lower than a safety threshold, and then control the second gas path to be conducted, so that the low-pressure gas storage tank injects a second inert gas into the receiving cavity.

[0006] In the technical solution of the embodiment of the present application, the detection signal obtained can detect the smoldering of the battery device at an early stage. When the battery device is smoldering, first, the high-pressure gas storage tank is used to quickly inject the first inert gas into the accommodation chamber, so as to quickly reduce the oxygen concentration in the accommodation chamber below the safety threshold when smoldering occurs, which can reduce the possibility of the smoldering being converted into flaming combustion to a certain extent. Then, the low-pressure gas storage tank is used to continuously inject the second inert gas into the accommodation chamber, so that the oxygen concentration in the accommodation chamber is maintained below the safety threshold to reduce the possibility of the battery device reigniting. On this basis, since the injection speed of the second inert gas from the low-pressure gas storage tank into the accommodation chamber is relatively low, it is to prevent the air pressure in the accommodation chamber from continuously increasing too high. In summary, this can help improve the reliability of the energy storage system.

[0007] In some embodiments, the energy storage system further includes a second detection unit, a liquid storage container, and a spraying device communicated with the liquid storage container; the second detection unit is used to detect the temperature in the accommodation chamber and send out a temperature signal; the control unit is further configured to obtain the temperature signal, and in response to the temperature signal indicating that the temperature in the accommodation chamber is not less than the temperature threshold, after controlling the first gas path to be conducted and the second gas path to be cut off, control the spraying device to spray coolant into the accommodation chamber. By spraying the coolant, the temperature of the battery device can be reduced, which can further reduce the possibility of reignition.

[0008] In some embodiments, a partition is provided in the cabinet, and the partition divides the interior of the cabinet into an accommodation chamber and an installation chamber. The liquid storage container and the high-pressure gas storage tank are accommodated in the installation chamber, and the low-pressure gas storage tank is arranged outside the cabinet. By making the battery device, the liquid storage container, the high-pressure gas storage tank, and the low-pressure gas storage tank not in the same chamber, the high-temperature substances and gases ejected when the battery device has a thermal runaway will not directly act on the liquid storage container, the high-pressure gas storage tank, and the low-pressure gas storage tank, resulting in the rupture of the liquid storage container, the high-pressure gas storage tank, and the low-pressure gas storage tank.

[0009] In some embodiments, the control unit is configured to delay the conduction of the second gas path by a first preset duration after controlling the first gas path to be conducted and the second gas path to be cut off, and within the first preset duration, the first inert gas in the high-pressure gas storage tank is injected into the accommodation chamber along the first gas path.

[0010] This embodiment enables the first inert gas in the high-pressure gas storage tank to be exhausted when the low-pressure gas storage tank injects gas into the accommodation chamber, so that when the second gas path is conducted, it is not necessary to control the first gas path to be cut off, which can prevent the first inert gas from being injected from the high-pressure gas storage tank into the low-pressure gas storage tank under the action of the pressure difference, thus simplifying the control process.

[0011] In some embodiments, the energy storage system further includes a third detection unit configured to detect the environment of the accommodation chamber and issue an environment signal; the control unit is configured to obtain the environment signal in response to the detection signal not meeting the first preset condition, and determine that the environment of the accommodation chamber is abnormal in response to the environment signal meeting the second preset condition, and control the second gas path to conduct, so that the low-pressure gas storage tank injects a second inert gas into the accommodation chamber.

[0012] In this embodiment, before the battery device undergoes smoldering, when the environment of the accommodation chamber is abnormal, a second inert gas is filled into the accommodation chamber at a low pressure, so that the accommodation chamber is in an inert gas atmosphere to achieve inerting protection.

[0013] In some embodiments, the third detection unit includes at least one of a humidity sensor, an oxygen concentration sensor, and a pressure sensor. The humidity sensor is configured to detect the environmental humidity of the accommodation chamber, the oxygen concentration sensor is configured to detect the oxygen concentration of the accommodation chamber, and the pressure sensor is configured to detect the air pressure of the accommodation chamber.

[0014] In some embodiments, the control unit is configured to, after determining that the environment of the accommodation chamber is abnormal and controlling the second gas path to conduct, further obtain the environment signal, and determine that the environment of the accommodation chamber is normal in response to the environment signal meeting the third preset condition, and control the second gas path to cut off. This embodiment sets a stop condition for the injection of the second inert gas, so that the low-pressure gas storage tank and the second gas path work intermittently to facilitate delaying their service life.

[0015] In some embodiments, the third detection unit includes a pressure sensor configured to detect the air pressure of the accommodation chamber. The second preset condition includes that the difference between the air pressure of the accommodation chamber and the atmospheric pressure is within a first pressure range. The third preset condition includes that the difference between the air pressure of the accommodation chamber and the atmospheric pressure is within a second pressure range. The pressure in the first pressure range is a positive value. The pressure in the second pressure range is greater than the pressure in the first pressure range, and the sum of the upper limit value of the second pressure range and the atmospheric pressure is less than the pressure of the low-pressure gas storage tank.

[0016] This embodiment enables the air pressure in the accommodation chamber to be a positive pressure relative to the atmospheric pressure, and at the same time, the air pressure in the accommodation chamber can also be lower than the pressures of the high-pressure gas storage tank and the low-pressure gas storage tank, so as to be able to inject gas into the accommodation chamber smoothly.

[0017] In some embodiments, the pressure of the high-pressure gas storage tank is greater than or equal to 15 MPa and less than or equal to 20 MPa, the pressure of the low-pressure gas storage tank is greater than or equal to 0.4 MPa and less than or equal to 0.6 MPa, and the second pressure range is 300 Pa to 1000 Pa.

[0018] In some embodiments, the third detection unit includes an oxygen concentration sensor configured to detect the oxygen concentration in the accommodation chamber. The second preset condition includes that the oxygen concentration in the accommodation chamber is greater than or equal to a first oxygen concentration threshold, and the third preset condition includes that the oxygen concentration in the accommodation chamber reaches a second oxygen concentration threshold. The first oxygen concentration threshold is greater than the second oxygen concentration threshold, and the second oxygen concentration threshold is a positive value.

[0019] This embodiment enables the accommodation chamber to maintain a low-oxygen environment rather than an oxygen-free environment when the environment is normal, allowing an operator to perform operations in the accommodation chamber.

[0020] In some embodiments, the control unit includes a first controller and a second controller. Both the first controller and the second controller can obtain detection signals. The first controller is configured to control the on / off of the first gas path, and the second controller is configured to control the on / off of the second gas path. The second controller is communicatively connected to the third detection unit and obtains environmental signals.

[0021] Compared with the technical solution of controlling the on / off of the first gas path and the second gas path by the same controller simultaneously, this can facilitate simplifying the control operation of a single controller.

[0022] In some embodiments, the first controller is communicatively connected to the second controller. The first controller sends communication information every second preset time period, and the first controller is electrically connected to the battery device. The second controller is configured to, after determining that the battery device is smoldering, in response to not obtaining communication information within the second preset time period, control the second gas path to conduct, so that the low-pressure gas storage tank injects a second inert gas into the accommodation chamber.

[0023] In this embodiment, when it is determined that the battery device is smoldering, if the first controller electrically connected to the battery device is broken down by high voltage and fails, resulting in the inability to smoothly control the high-pressure gas storage tank to fill the accommodation chamber with the first inert gas, the second controller determines that the first controller fails when it does not obtain communication information within the second preset time period, and then injects the second inert gas into the accommodation chamber through the low-pressure gas storage tank, so as to reduce the possibility of the smoldering being converted into flaming combustion to a certain extent.

[0024] In some embodiments, the energy storage system includes a plurality of energy storage devices, as well as a first detection unit, a third detection unit, a high-pressure gas storage tank, and a first controller that are consistent in number with the energy storage devices. Each first detection unit, each third detection unit, each high-pressure gas storage tank, and each first controller are provided on one energy storage device. The plurality of energy storage devices are controlled by the same second controller, and the accommodation chambers of the plurality of energy storage devices are communicated with the same low-pressure gas storage tank.

[0025] This embodiment enables the energy storage system to integrate a plurality of energy storage devices, so as to provide a large amount of electric energy for electrical equipment.

[0026] In some embodiments, the energy storage system further includes an alarm. The control unit is further configured to send an alarm signal after determining the smoldering of the battery device, and the alarm obtains the alarm signal and gives an alarm.

[0027] In this embodiment, the alarm is used to perform the alarm operation. In this way, the operator can learn in time that the battery device is smoldering and can take corresponding measures in time.

[0028] In some embodiments, the battery device is connected to an electrical device through a circuit. The circuit is provided with a circuit breaker. The control unit is further configured to control the circuit breaker to trip after determining the smoldering of the battery device.

[0029] In some embodiments, the energy storage system further includes an inert gas generator, which is connected to a low-pressure gas storage tank through a connecting pipeline; the control unit is configured to control the inert gas generator to generate a second inert gas while controlling the second gas path to conduct, and fill the low-pressure gas storage tank with the second inert gas through the connecting pipeline.

[0030] In this embodiment, when the low-pressure gas storage tank fills the accommodation chamber with the second inert gas, the inert gas generator can continuously supply the second inert gas to the low-pressure gas storage tank.

[0031] An embodiment of the second aspect of the present application provides a control method for an energy storage system, which is applied to the energy storage system in the above embodiments. The control method includes: obtaining a detection signal; in response to the detection signal satisfying a first preset condition, determining that the battery device is smoldering, controlling the first gas path to conduct and the second gas path to cut off, so that the high-pressure gas storage tank injects the first inert gas into the accommodation chamber, making the oxygen concentration in the accommodation chamber lower than the safety threshold, and then controlling the second gas path to conduct, so that the low-pressure gas storage tank injects the second inert gas into the accommodation chamber.

[0032] An embodiment of the third aspect of the present application provides a computing device, including: at least one processor; and at least one memory communicatively connected to the at least one processor. The at least one memory stores instructions that, when executed alone or jointly by the at least one processor, cause the computing device to execute the control method of the energy storage system in the above embodiments.

[0033] An embodiment of the fourth aspect of the present application provides a computer-readable storage medium storing instructions that, when executed alone or jointly by one or more processors of a computing device, cause the computing device to execute the control method of the energy storage system in the above embodiments.

[0034] An embodiment of the fifth aspect of the present application provides a computer program product including instructions that, when executed alone or jointly by one or more processors of a computing device, cause the computing device to execute the control method of the energy storage system in the above embodiments.

[0035] The above description is only an overview of the technical solution of this application. In order to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of this application more obvious and understandable, the following specifically gives the specific implementation manners of this application. Description of the Drawings

[0036] In the drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in accordance with this application and should not be regarded as limiting the scope of this application.

[0037] Figure 1 Structural schematic diagram of an energy storage system according to some embodiments of this application; Figure 2 is Figure 1 Schematic diagram of the principle of the low-pressure gas storage tank of the energy storage system shown injecting gas into the cabinet; Figure 3 Schematic diagram of the principle of the low-pressure gas storage tank of the energy storage system injecting gas into the cabinet according to other embodiments of this application; Figure 4 Flow schematic diagram of the control method of the energy storage system according to some embodiments of this application; Figure 5 Structural schematic diagram of a computing device provided by an embodiment of this application.

[0038] Description of the Reference Numerals: 100, energy storage system; 10, energy storage device, 11, cabinet, 111, partition, 112, accommodation cavity, 113, installation cavity, 114, alarm, 116, start-stop button, 12, battery device; 20, first detection unit, 21, smoke concentration sensor, 22, second detection unit; 30, high-pressure gas storage tank; 40, low-pressure gas storage tank, 41, second valve, 42, check valve, 43, pressure reducing valve, 44, main pipeline, 45, control valve; 50, control unit, 51, first controller, 52, second controller, 53, signal processor; 60, liquid storage container; 70, third detection unit, 71, humidity sensor, 72, oxygen concentration sensor, 73, pressure sensor; 80, inert gas generator, 81, connecting pipeline; 200, computing device, 201, processor, 202, memory, 203, communication component, 204, bus. Detailed implementation manners

[0039] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0041] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0042] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0043] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0044] In the description of the embodiments of this application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0045] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0046] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "attachment", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements.

[0047] In the present application, the term "parallel" includes not only the case of absolute parallelism but also the case of approximately parallelism commonly recognized in engineering; at the same time, "perpendicular" also includes not only the case of absolute perpendicularity but also the case of approximately perpendicularity commonly recognized in engineering. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0048] With the continuous development of power energy storage systems, energy storage technologies are widely used in fields such as new energy power generation and power services. Among various energy storage forms, electrochemical energy storage has been vigorously developed due to its advantages such as high energy conversion efficiency, fast response speed, and modularity. Since the working environment of the energy storage system is relatively enclosed and the heat dissipation conditions are limited, the rechargeable batteries in the energy storage system are prone to heat accumulation during the charging and discharging process. Especially under extreme working conditions, heat accumulation is likely to cause a sharp increase in the internal temperature of the battery and lead to a thermal runaway phenomenon. If the thermal runaway phenomenon is not controlled, the large amount of heat and harmful gases emitted by the thermal runaway will cause a chain reaction, resulting in the ignition and explosion of other batteries. Battery ignition and explosion not only easily cause casualties but also result in significant economic losses.

[0049] The current fire protection solution for energy storage systems mainly identifies battery fires by collecting thermal runaway information inside the cabinet and triggers fire extinguishing operations after the thermal runaway information indicates a battery fire. However, this can only carry out emergency disposal after a fire occurs, and there are obvious limitations. Moreover, when lithium batteries are used in energy storage systems, if a lithium battery experiences thermal runaway, a chain exothermic reaction will occur inside it (such as the decomposition of the SEI film (solid electrolyte interface film), the reaction of the positive and negative electrode materials, the combustion of the electrolyte, etc.). In this case, even if the open fire is extinguished, the lithium battery may still continue to heat up due to chemical reactions inside, making it prone to reignition.

[0050] Based on the above considerations, an energy storage system is designed. When a single battery in the battery device experiences thermal runaway, and there is no open fire and the battery device is smoldering, an inert gas is quickly injected into the accommodation cavity where the battery device is located to reduce the concentration of combustibles at the source and reduce the possibility of the battery device burning with flames. Moreover, an inert gas is continuously injected into the accommodation cavity afterwards, which can reduce the possibility of reignition and enable the thermally runaway battery device to burn out by itself.

[0051] The energy storage system of the embodiments of the present application can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. Figure 1 The following is a schematic structural diagram of the energy storage system of some embodiments of the present application. As Figure 1 shown, the energy storage system includes an energy storage device, and the energy storage device uses a battery device as a power supply system. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low electricity consumption periods and provide electrical energy to relevant users or electrical equipment during high electricity consumption periods.

[0052] In some embodiments, the energy storage device can be an energy storage container, an energy storage electrical cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system.

[0053] In some embodiments, as Figure 1 shown, the energy storage device 10 can include a cabinet 11 and one or more battery clusters. The battery clusters are accommodated in the cabinet 11. The battery cluster can include a plurality of battery devices 12, and the plurality of battery devices 12 are connected in series through a busbar component to increase the voltage of the energy storage device 10. When the energy storage device 10 includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device 10.

[0054] In some embodiments, the battery device 12 may be a battery pack, which includes a housing and one or more battery cells housed within the housing. The housing may be a simple three-dimensional structure such as a single rectangular parallelepiped, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as rectangular parallelepipeds, cylinders, or spheres. The housing may be made of alloy materials such as aluminum alloys and iron alloys, polymer materials such as polycarbonate and polyisocyanurate foam, or composite materials such as fiberglass and epoxy resin.

[0055] The battery cells involved in the embodiments of the present application may be secondary batteries, which refer to battery cells that can be used continuously by activating the active materials by charging after the battery cells are discharged. The battery cells involved in the embodiments of the present application may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., and the embodiments of the present application are not limited to this. As an example, the battery cells may be cylindrical battery cells, prismatic battery cells, or battery cells of other shapes. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal prismatic battery cells. Polygonal prismatic battery cells are, for example, hexagonal battery cells, etc., and the present application has no special restrictions.

[0056] like Figure 1 As shown, the energy storage system 100 of the embodiment of the present application may further include a first detection unit 20, a high-pressure gas tank 30, a low-pressure gas tank 40, and a control unit 50. The first detection unit 20 is at least configured to detect the smoke concentration within the receiving chamber 112 and emit a detection signal, the detection signal comprising at least a smoke concentration signal. The high-pressure gas tank 30 is connected to the receiving chamber 112 via a first, switchable, air path. The low-pressure gas tank 40 is connected to the receiving chamber 112 via a second, switchable, air path. The control unit 50 is configured to obtain the detection signal and, in response to the detection signal satisfying a first preset condition, determine that the battery device 12 is smoldering. The control unit 50 controls the first air path to be open and the second air path to be closed, thereby allowing the high-pressure gas tank 30 to inject a first inert gas into the receiving chamber 112, reducing the oxygen concentration in the receiving chamber 112 to below a safety threshold. The control unit 50 then controls the second air path to be open, thereby allowing the low-pressure gas tank 40 to inject a second inert gas into the receiving chamber 112.

[0057] A first inert gas is stored in the high-pressure gas storage tank 30, and a second inert gas is stored in the low-pressure gas storage tank 40. The terms "high pressure" and "low pressure" are relative terms. The gas pressure in the high-pressure gas storage tank 30 is relatively high, while the gas pressure in the low-pressure gas storage tank 40 is relatively low. Furthermore, the gas pressures in both the high-pressure gas storage tank 30 and the low-pressure gas storage tank 40 are greater than the gas pressure in the cabinet 11, creating a pressure differential. This allows the first inert gas to be injected into the accommodating chamber 112 when the first gas path is open, and the second inert gas to be injected into the accommodating chamber 112 when the second gas path is open.

[0058] The first inert gas and the second inert gas can both be selected from one or more of nitrogen, argon, helium, neon, etc. The first inert gas and the second inert gas can be the same or different.

[0059] In some embodiments, the first gas path and the second gas path can be independent of each other and not connected to each other. Specifically, the energy storage system 100 can also include two tubes, the gas outlet of the high-pressure gas storage tank 30 and the gas outlet of the low-pressure gas storage tank 40 are respectively connected to one end of the two tubes, and the other ends of the two tubes extend into the accommodating cavity 112. The tubes are provided with through holes, which are connected to the accommodating cavity 112. The inner surface of the tube connected to the gas outlet of the high-pressure gas storage tank 30 encloses the first gas path, and the inner surface of the tube connected to the gas outlet of the low-pressure gas storage tank 40 encloses the second gas path. Among them, the gas outlet or the tube can be provided with an on-off valve, which is opened and closed to realize the on-off of the gas path it encloses.

[0060] In some embodiments, a portion of the first gas circuit and a portion of the second gas circuit are shared. Figure 1 As shown, the gas outlet of the high-pressure gas tank 30 is connected to one end of a connecting pipe, and the other end of the connecting pipe is connected to the gas outlet of the low-pressure gas tank 40. A portion of the connecting pipe is located within the accommodating chamber 112, and the connecting pipe is provided with an opening that communicates with the accommodating chamber 112. A first valve is provided at the gas outlet of the high-pressure gas tank 30 or the section of the connecting pipe between the gas outlet and the opening. The first gas path is opened and closed by controlling the opening and closing of the first valve. A second valve 41 is provided at the gas outlet of the low-pressure gas tank 40 or the section of the connecting pipe between the gas outlet and the opening. The second gas path is opened and closed by controlling the opening and closing of the second valve 41. In this example, after determining that the battery device 12 is smoldering, the first gas path is opened and the second gas path is closed to prevent the high-pressure gas tank 30 from filling the low-pressure gas tank 40 with the first inert gas due to the pressure differential. Furthermore, the second valve 41 can be a one-way valve, which only allows the second inert gas to flow from the gas outlet of the low-pressure gas storage tank 40 to the accommodating chamber 112 in one direction, so as to prevent the first inert gas from being filled into the low-pressure gas storage tank 40 under the action of pressure difference.

[0061] The control unit 50 is an electronic device capable of receiving sensor signals, processing data, and driving actuators. The control unit 50 is communicatively connected to the first detection unit 20. Since the detection signal includes a smoke concentration signal, the control unit 50 can at least receive the smoke concentration signal. In the embodiment of the present application, smoldering refers to flameless combustion. During smoldering, there is no visible light, and at the same time, smoke is generated. It can be seen from this that smoke is generated during smoldering. Therefore, it can be determined whether the battery device 12 is smoldering through the smoke concentration signal.

[0062] The first detection unit 20 at least includes a smoke detection element. The smoke detection element can specifically be any one of a smoke concentration sensor 21, a photoionization detector, etc. As a possible example, the first detection unit 20 can only include a smoke detection element. In this example, the first preset condition is that the smoke concentration in the accommodation cavity 112 reaches a preset smoke concentration. As an example, the first detection unit 20 can include a smoke detection element and a flame detection element. The flame detection element is used to detect the flame intensity in the accommodation cavity 112. The flame detection element can be implemented as a flame sensor, etc. The detection signal includes a smoke concentration signal and a flame intensity signal. In this example, the first preset condition includes the following conditions: the smoke concentration in the accommodation cavity 112 reaches a preset smoke concentration; the flame intensity in the accommodation cavity 112 is lower than a preset value. The above-mentioned preset smoke concentration can be a smoke concentration threshold indicating that the battery device 12 is smoldering, and the preset value is a threshold of the flame intensity when the battery device 12 has flameless combustion. As an example, the first detection unit 20 can also include a sound detection unit. The sound detection unit is used to detect the sound in the accommodation cavity 112. The detection signal includes a smoke concentration signal and a sound signal. In this example, the first preset condition includes the following conditions: the smoke concentration in the accommodation cavity 112 reaches a preset smoke concentration; the sound in the accommodation cavity 112 is a pre-determined popping sound. Since the battery device 12 makes a popping sound during smoldering, it can be assisted to determine whether the battery device 12 is smoldering through the sound signal.

[0063] The installation position of the first detection unit 20 (smoke detection element) in the accommodation cavity 112 is not limited. For example, it can be provided on the top wall of the cabinet 11, or can be provided on the bottom wall of the cabinet 11, or can also be provided on the carrier for carrying the battery device 12 in the cabinet 11. The number of the first detection units 20 is also not limited, and can be one or more. Figure 1 Two smoke detection elements are shown, and it can also be three, four or more. In the embodiment where there are multiple first detection units 20, they can be used as spares. Even if some first detection units 20 fail, the other first detection units 20 can still work normally to enable reliable detection.

[0064] During actual operation, the energy storage system 100 of this embodiment can detect smoldering (flameless combustion) of the battery unit 12 early by acquiring detection signals when a battery cell experiences thermal runaway. The system first rapidly fills the containment chamber 112 with a first inert gas via the high-pressure gas storage tank 30. This allows the oxygen concentration within the containment chamber 112 to be quickly reduced to below a safety threshold when smoldering occurs, thereby suppressing the oxygen concentration (one of the three elements of combustion) before a fire ignites. This reduces the likelihood of smoldering transitioning to flaming combustion, allowing the battery cell experiencing thermal runaway to spontaneously combust (i.e., cease combustion) while in the smoldering state, thereby reducing the risk of igniting adjacent battery units 12. Furthermore, after rapidly filling the containment chamber 112 with the first inert gas, the system continuously fills the containment chamber 112 with a second inert gas via the low-pressure gas storage tank 40. This maintains the oxygen concentration within the containment chamber 112 below a safety threshold (maintaining a low-oxygen environment) while suppressing the combustion reaction of the battery unit 12, thereby reducing the likelihood of re-ignition of the battery unit 12. On this basis, since the low-pressure gas storage tank 40 fills the second inert gas into the accommodating chamber 112 at a low injection speed, the gas pressure in the accommodating chamber 112 is prevented from continuously increasing and becoming too high. In summary, this can help improve the reliability of the energy storage system 100.

[0065] According to some embodiments of this application, please continue to refer to Figure 1 The energy storage system 100 may further include a liquid storage container 60 and a spray device connected to the liquid storage container 60. The energy storage system 100 may further include a second detection unit 22, which is configured to detect the temperature within the accommodating chamber 112 and issue a temperature signal. In this example, the control unit 50 is further configured to obtain the temperature signal and, in response to the temperature signal indicating that the temperature within the accommodating chamber 112 is not less than a temperature threshold, control the spray device to spray coolant into the accommodating chamber 112 after controlling the first gas path to be opened and the second gas path to be closed.

[0066] The liquid storage container 60 is used to contain the coolant, which can be any one of water, liquid carbon dioxide, liquid nitrogen, etc. The liquid storage container 60 can be connected to the spray device through a connecting pipe. The spray device is arranged in the accommodating cavity 112. The spray device can be, for example, a nozzle. Figure 1 As shown, the spray device may be located above all the battery devices 12 , or the spray device may also be provided on the side wall of the accommodating cavity 112 .

[0067] The control unit 50 is also communicatively connected to the second detection unit 22 to be able to receive temperature signals. The second detection unit 22 can specifically be implemented as any one of a temperature sensor, an infrared thermal imager, etc. The installation position of the second detection unit 22 in the accommodation cavity 112 is not limited. For example, it can be provided on the top wall of the cabinet body 11, or can be provided on the bottom wall of the cabinet body 11, or can also be provided on the carrier frame inside the cabinet body 11 for carrying the battery device 12. The number of the second detection units 22 is also not limited, and can be one or more, Figure 1 Two are shown in

[0068] and can also be three, four or more. In an embodiment where there are multiple second detection units 22, they can be used as spares. Even if some of the second detection units 22 fail, the other second detection units 22 can still work normally to reliably detect the temperature.

[0069] During the actual working process, if a thermal runaway occurs in a battery cell, by acquiring the detection signal and determining that the battery device 12 has a smoldering fire according to the detection signal, the first inert gas is quickly injected into the accommodation cavity 112 through the high-pressure gas storage tank 30. When there is a thermal runaway and a smoldering fire, the temperature also rises. By acquiring the temperature signal and when the temperature signal indicates that the temperature in the accommodation cavity 112 is greater than or equal to the temperature threshold, the spraying device is controlled to spray the coolant.

[0070] In this embodiment, when a smoldering fire occurs in the battery device 12, after quickly injecting the first inert gas into the accommodation cavity 112, the coolant is also sprayed into the accommodation cavity 112. Since the temperature rises during the thermal runaway and the smoldering fire, by spraying the coolant, the temperature of the battery device 12 can be reduced. This can not only reduce the possibility of re-ignition, but also further reduce the possibility of the smoldering fire being converted into a flaming combustion, thereby reducing the risk of the thermal runaway spreading and causing the battery cells of the adjacent battery device 12 to have a thermal runaway.

[0071] In some embodiments, the control unit 50 can determine whether the temperature signal is not less than the temperature threshold after controlling the first gas path to be conducted and the second gas path to be cut off and before controlling the second gas path to be conducted, and control the spraying device to spray the coolant into the accommodation cavity 112 in response to the temperature signal being not less than the temperature threshold. In this example, determining whether the temperature signal is not less than the temperature threshold is performed after the high-pressure injection of the first inert gas.

[0072] In some embodiments, the control unit 50 can, in response to the detection signal satisfying the first preset condition to determine that the battery device 12 is smoldering, and in response to the temperature signal being no less than a temperature threshold, first control the first gas path to be open and the second gas path to be closed, so that the high-pressure gas storage tank 30 injects the first inert gas into the accommodating chamber 112, then control the spray device to spray coolant into the accommodating chamber 112, and finally control the second gas path to be open, so that the low-pressure gas storage tank 40 injects the second inert gas into the accommodating chamber 112. In this example, determining whether the temperature signal is no less than the temperature threshold is performed before the high-pressure filling of the first inert gas.

[0073] In general, whether before or after the first inert gas is filled into the accommodating chamber 112 , if it is determined that the temperature signal is not less than the temperature threshold, the spray device is controlled to spray the coolant after the first inert gas is filled.

[0074] In some embodiments, the control unit 50 may be further configured to control the spray device to spray coolant into the accommodating chamber 112 after controlling the first gas path to be opened and the second gas path to be closed, and before controlling the second gas path to be opened. In this example, when it is determined that the battery device 12 is smoldering, the accommodating chamber 112 is first rapidly filled with a first inert gas via the high-pressure gas storage tank 30. If the temperature signal indicates that the temperature within the accommodating chamber 112 is greater than or equal to a temperature threshold, the spray device is controlled to spray coolant, and then the accommodating chamber 112 is filled with a second inert gas via the low-pressure gas storage tank 40.

[0075] In other embodiments, the control unit 50 may be further configured to, after controlling the second gas path to be open, control the spray device to spray coolant into the accommodating chamber 112. In this example, when it is determined that the battery device 12 is smoldering, the accommodating chamber 112 is first rapidly filled with a first inert gas via the high-pressure gas storage tank 30, and then filled with a second inert gas via the low-pressure gas storage tank 40, so that the accommodating chamber 112 maintains a low-oxygen environment before spraying.

[0076] According to some embodiments of this application, please continue to refer to Figure 1 A partition 111 is provided inside the cabinet 11, which divides the interior of the cabinet 11 into a receiving chamber 112 and an installation chamber 113. The liquid storage container 60 and the high-pressure gas storage tank 30 can both be accommodated in the installation chamber 113, and the low-pressure gas storage tank 40 is arranged outside the cabinet 11.

[0077] The cabinet 11 can be rectangular, and the thickness of the partition 111 can be arranged parallel to the length or width of the cabinet 11. In some embodiments, the outlet of the high-pressure gas storage tank 30 is connected to one end of a tube. In this example, the tube extends from the mounting cavity 113 into the accommodating cavity 112. The flow tube connected to the liquid storage container 60 also extends from the mounting cavity 113 into the accommodating cavity 112.

[0078] In this embodiment, the battery device 12 is not located in the same chamber as the liquid storage container 60, the high-pressure gas storage tank 30, and the low-pressure gas storage tank 40. This prevents the high-temperature substances and gases ejected from the battery device 12 during thermal runaway from directly affecting the liquid storage container 60, the high-pressure gas storage tank 30, and the low-pressure gas storage tank 40. This reduces the risk of the liquid storage container 60, the high-pressure gas storage tank 30, and the low-pressure gas storage tank 40 being ruptured by the high-temperature substances and gases, thereby enabling the energy storage system 100 to operate reliably.

[0079] According to some embodiments of the present application, the control unit 50 is configured to delay for a first preset time period to control the conduction of the second gas path after controlling the conduction of the first gas path and the disconnection of the second gas path, and within the first preset time period, the first inert gas in the high-pressure gas storage tank 30 is injected into the accommodating chamber 112 along the first gas path.

[0080] The first preset time duration is related to the gas volume in the high-pressure gas storage tank 30 and the outflow rate of the first inert gas. The first preset time duration is greater than or equal to the time required for the gas volume in the high-pressure gas storage tank 30 to reach zero cubic meters (i.e., the time duration for the first inert gas to be depleted). In some embodiments, the first preset time duration is greater than or equal to 3 minutes (min) and less than or equal to 5 minutes, and can specifically be 3 minutes, 4 minutes, 5 minutes, or a range consisting of any two thereof.

[0081] As a possible example, the energy storage system 100 may include a timer, which is connected to the control unit 50. When the control unit 50 determines that the battery device 12 is smoldering, it controls the first gas path to be connected and the second gas path to be cut off. At the same time, it controls the timer to count. When the timing reaches a first preset time, the first inert gas in the high-pressure gas storage tank 30 is exhausted, and the second gas path is controlled to be connected.

[0082] As a possible example, the second valve 41 for realizing on-off of the second gas path may also be a time-delay valve, which is configured to open the second gas path after the first gas path is opened for a first preset time period.

[0083] In this embodiment, when the low-pressure gas storage tank 40 injects gas into the accommodating chamber 112, the first inert gas in the high-pressure gas storage tank 30 is exhausted. This allows the second gas path to be connected, and there is no need to control the first gas path to be cut off. This prevents the high-pressure gas storage tank 30 from injecting the first inert gas into the low-pressure gas storage tank 40 due to the pressure difference, thereby simplifying the control process.

[0084] Figure 2 for Figure 1 The schematic diagram of the principle of the low-pressure gas storage tank 40 of the energy storage system 100 injecting gas into the cabinet 11 is shown. According to some embodiments of the present application, such as Figure 1 and Figure 2As shown, the energy storage system 100 may further include a third detection unit 70, which is configured to detect the environment of the accommodation chamber 112 and issue an environment signal. In this example, the control unit 50 may further be configured to, in response to the detection signal not meeting the first preset condition, obtain the environment signal, and in response to the environment signal meeting the second preset condition, determine that the environment of the accommodation chamber 112 is abnormal, and control the second gas path to conduct, so that the low-pressure gas storage tank 40 injects the second inert gas into the accommodation chamber 112.

[0085] The third detection unit 70 is communicatively connected to the control unit 50. The second preset condition refers to the condition when the environment signal characterizes that the environment of the accommodation chamber 112 is abnormal. In this embodiment, when the detection signal does not meet the first preset condition, that is, when the battery device 12 is not smoldering, it is determined whether the environment signal meets the second preset condition. In the case where the environment signal meets the second preset condition, the second inert gas is low-pressure filled into the accommodation chamber 112 through the low-pressure gas storage tank 40. In Figure 3 , when the low-pressure gas storage tank 40 low-pressure fills the second inert gas into the accommodation chamber 112, the gas flow direction of the second inert gas is shown by a solid arrow.

[0086] In some embodiments, along the inflow end to the outflow end of the first gas path, a check valve 42 and a pressure reducing valve 43 are sequentially arranged on the first gas path. The check valve 42 only allows the second inert gas to flow from the outlet of the high-pressure gas storage tank 30 to the accommodation chamber 112.

[0087] This embodiment enables the second inert gas to be low-pressure filled into the accommodation chamber 112 when the environment of the accommodation chamber 112 is abnormal before the battery device 12 smolders, so that the accommodation chamber 112 is in an inert gas atmosphere to achieve inerting protection. It can be understood that throughout the entire product life cycle of the energy storage system 100 in this embodiment, the accommodation chamber 112 is maintained in an inert gas atmosphere to achieve inerting protection.

[0088] According to some embodiments of the present application, please continue to refer to Figure 2 , the third detection unit 70 may specifically include at least one of a humidity sensor 71, an oxygen concentration sensor 72, and a pressure sensor 73. The humidity sensor 71 is configured to detect the environmental humidity of the accommodation chamber 112, the oxygen concentration sensor 72 is configured to detect the oxygen concentration of the accommodation chamber 112, and the pressure sensor 73 is configured to detect the air pressure of the accommodation chamber 112.

[0089] The installation position of the third detection unit 70 in the accommodation chamber 112 is not limited. For example, it may be provided on the top wall of the cabinet 11, or may be provided on the bottom wall of the cabinet 11, or may also be provided on the carrier for carrying the battery device 12 within the cabinet 11.

[0090] As an example, the third detection unit 70 includes a humidity sensor 71. Correspondingly, the second preset condition includes that the humidity in the accommodation chamber 112 is not less than a first humidity threshold, and the first humidity threshold is a threshold for characterizing the abnormal environmental humidity in the accommodation chamber 112. For example, the first humidity threshold can be 40%, that is, when the humidity in the accommodation chamber 112 is greater than or equal to 40%, it is determined that the environment in the accommodation chamber 112 is abnormal, and a second inert gas is injected into the accommodation chamber 112 to reduce the environmental humidity in the accommodation chamber 112. In this embodiment, when the humidity in the accommodation chamber 112 is abnormal, by injecting a second inert gas into the accommodation chamber 112, the inerting protection achieved is to reduce the humidity in the accommodation chamber 112, reducing the possibility of insulation failure (short circuit / leakage) of the energy storage system 100 due to high humidity, thereby facilitating the improvement of the reliability of the energy storage system 100.

[0091] As an example, the third detection unit 70 includes an oxygen concentration sensor. Correspondingly, the second preset condition includes that the oxygen concentration in the accommodation chamber 112 is not less than a first oxygen concentration threshold, and the first oxygen concentration threshold is a threshold for characterizing the abnormal oxygen concentration in the accommodation chamber 112. For example, the first oxygen concentration threshold can be 9%, that is, when the oxygen concentration in the accommodation chamber 112 is greater than or equal to 9%, it is determined that the environment in the accommodation chamber 112 is abnormal, and a second inert gas is injected into the accommodation chamber 112 to reduce the oxygen concentration in the accommodation chamber 112. In this embodiment, when the oxygen concentration in the accommodation chamber 112 is abnormal before smoldering, by injecting a second inert gas into the accommodation chamber 112, the inerting protection achieved is to reduce the oxygen concentration in the accommodation chamber 112 to prevent the possibility of the battery cell catching fire. [[ID=**4**]] [[ID=**5**]]

[0092] [[ID=**6**]]As an example, the third detection unit 70 includes a pressure sensor 73. Correspondingly, the second preset condition includes that the difference between the air pressure in the accommodation chamber 112 and the atmospheric pressure is within a first pressure range, where the pressure in the first pressure range is positive, indicating that the air pressure in the accommodation chamber 112 is slightly higher than the atmospheric pressure (that is, the difference between the air pressure in the accommodation chamber 112 and the atmospheric pressure is small). The difference between the air pressure in the accommodation chamber 112 and the atmospheric pressure refers to the value obtained by subtracting the atmospheric pressure from the air pressure in the accommodation chamber 112. In this embodiment, when the air pressure in the accommodation chamber 112 is slightly higher than the atmospheric pressure, by injecting a second inert gas into the accommodation chamber 112, the inerting protection achieved is to increase the air pressure in the accommodation chamber 112 to ensure that the air pressure in the accommodation chamber 112 is a positive pressure relative to the atmospheric pressure (that is, the air pressure in the accommodation chamber 112 is greater than the atmospheric pressure), so as to prevent oxygen in the atmosphere from flowing into the accommodation chamber 112 and maintaining the oxygen concentration in the accommodation chamber 112 below the first oxygen concentration threshold. [[ID=**7**]] [[ID=**8**]]

[0093] [[ID=**9**]]According to some embodiments of the present application, the control unit 50 can also be configured to, after determining that the environment in the accommodation chamber 112 is abnormal and controlling the second gas path to conduct, further obtain an environmental signal, and determine that the environment in the accommodation chamber 112 is normal and control the second gas path to cut off in response to the environmental signal satisfying a third preset condition.

[0094] The third preset condition refers to the condition when the environmental signal indicates that the environment of the accommodation chamber 112 is normal. In this embodiment, when it is determined that the environment of the accommodation chamber 112 is abnormal, the second gas path is controlled to conduct, so as to inject a second inert gas into the accommodation chamber 112. After that, the third detection unit 70 continuously detects the environment of the accommodation chamber 112 and issues an environmental signal, and the control unit 50 continuously determines whether the environmental signal meets the third preset condition. When the environmental signal meets the third preset condition, the second gas path is controlled to be cut off, and the injection of the second inert gas into the accommodation chamber 112 is stopped.

[0095] This embodiment stops injecting the second inert gas into the accommodation chamber 112 after the environment of the accommodation chamber 112 becomes normal. In other words, this embodiment sets a stop condition for the injection of the second inert gas. On the one hand, the cost of the inert gas can be saved. On the other hand, the low-pressure gas storage tank 40 and the second gas path work intermittently, which is beneficial to delaying their service life.

[0096] According to some embodiments of the present application, in the embodiment where the third detection unit 70 includes a pressure sensor 73 for detecting the air pressure in the accommodation chamber 112, the second preset condition includes that the difference between the air pressure in the accommodation chamber 112 and the atmospheric pressure is within a first pressure range, and the third preset condition includes that the difference between the air pressure in the accommodation chamber 112 and the atmospheric pressure is within a second pressure range. The pressure in the first pressure range is a positive value, the pressure in the second pressure range is greater than the pressure in the first pressure range, and the sum of the upper limit value of the second pressure range and the atmospheric pressure is less than the pressure of the low-pressure gas storage tank 40.

[0097] That the pressure in the first pressure range is a positive value means that any value in the first pressure range is greater than 0 Pa. That the pressure in the second pressure range is greater than the pressure in the first pressure range means that the lower limit value of the second pressure range is greater than the upper limit value of the first pressure range. When the difference between the air pressure in the accommodation chamber 112 and the atmospheric pressure is the upper limit value of the second pressure range, the air pressure in the accommodation chamber 112 reaches the maximum safety threshold. Since the sum of the upper limit value of the second pressure range and the atmospheric pressure is less than the pressure of the low-pressure gas storage tank 40, it means that the air pressure in the accommodation chamber 112 is still less than the pressure of the low-pressure gas storage tank 40 when it reaches the maximum safety threshold.

[0098] In this embodiment, when the battery device 12 is not smoldering, when the pressure difference between the air pressure in the accommodation chamber 112 and the atmospheric pressure is within the first pressure range, the low-pressure gas storage tank 40 injects the second inert gas into the accommodation chamber 112 until the pressure difference between the air pressure in the accommodation chamber 112 and the atmospheric pressure increases to be within the second pressure range, and then the low-pressure gas storage tank 40 stops injecting the second inert gas into the accommodation chamber 112, so that the air pressure in the accommodation chamber 112 is positive relative to the atmospheric pressure when the environment is normal, so as to prevent oxygen in the atmosphere from flowing into the accommodation chamber 112 and keep the oxygen concentration in the accommodation chamber 112 below the first oxygen concentration threshold.

[0099] In this embodiment, when the battery device 12 undergoes smoldering combustion, since the pressures of the high-pressure gas storage tank 30 and the low-pressure gas storage tank 40 are both greater than the air pressure in the accommodation chamber 112 under normal ambient conditions, it is ensured that gas can be injected into the accommodation chamber 112 under the action of the pressure difference.

[0100] This embodiment enables the air pressure in the accommodation chamber 112 to be positive relative to the atmospheric pressure, and at the same time, the air pressure in the accommodation chamber 112 is also lower than the pressures of the high-pressure gas storage tank 30 and the low-pressure gas storage tank 40, so that when the battery device 12 undergoes smoldering combustion, the oxygen concentration in the accommodation chamber 112 can be reduced by injecting gas, which is beneficial to enabling the battery cells that have experienced thermal runaway to burn without open flames.

[0101] According to some embodiments of the present application, the pressure of the high-pressure gas storage tank 30 can be greater than or equal to 15 MPa and less than or equal to 20 MPa, the pressure of the low-pressure gas storage tank 40 can be greater than or equal to 0.4 MPa and less than or equal to 0.6 MPa, and the second pressure range can be 300 Pa to 1000 Pa.

[0102] The pressure of the high-pressure gas storage tank 30 can be 15 MPa, 16 MPa, 17 MPa, 18 MPa, 19 MPa, 20 MPa, or a range composed of any two of them. The pressure of the low-pressure gas storage tank 40 can be 0.4 MPa, 0.45 MPa, 0.5 MPa, 0.55 MPa, 0.6 MPa, or a range composed of any two of them.

[0103] The upper limit value of the second pressure range is 1000 Pa, and the sum of 1000 Pa and the atmospheric pressure is less than the pressure of the low-pressure gas storage tank 40. The first pressure range can be 50 Pa to 100 Pa. In the embodiments of the present application, numerical ranges such as m Pa to n Pa include the upper limit value and the lower limit value as long as there is no special description. That is, "m Pa to n Pa" represents a numerical range of "m Pa or more and n Pa".

[0104] According to some embodiments of the present application, in the embodiment where the third detection unit 70 includes an oxygen concentration sensor 72 for detecting the oxygen concentration in the accommodation chamber 112, the second preset condition includes that the oxygen concentration in the accommodation chamber 112 is greater than or equal to the first oxygen concentration threshold, the third preset condition includes that the oxygen concentration in the accommodation chamber 112 reaches the second oxygen concentration threshold, the first oxygen concentration threshold is greater than the second oxygen concentration threshold, and the second oxygen concentration threshold can be a positive value.

[0105] Exemplarily, the second oxygen concentration threshold may be 3% to 6%, for example, it may be 3%, 4%, 5%, 6%, or a range composed of any two of them. In this embodiment, when the battery device 12 is not smoldering, when the oxygen concentration in the accommodation chamber 112 is greater than or equal to the first oxygen concentration threshold, the low-pressure gas storage tank 40 injects the second inert gas into the accommodation chamber 112 until the oxygen concentration in the accommodation chamber 112 decreases to the second oxygen concentration threshold, and then the low-pressure gas storage tank 40 stops injecting the second inert gas into the accommodation chamber 112, so that the oxygen concentration in the accommodation chamber 112 is maintained between the first oxygen concentration threshold and the second oxygen concentration threshold when the environment is normal.

[0106] This embodiment enables the inside of the accommodation chamber 112 to maintain a low-oxygen environment rather than an oxygen-free environment when the environment is normal, so that the oxygen concentration in the accommodation chamber 112 is neither too high nor too low, enabling the operator to stay and operate inside the accommodation chamber 112.

[0107] According to some embodiments of the present application, in the embodiment where the third detection unit 70 includes a humidity sensor 71 for detecting the environmental humidity in the accommodation chamber 112, the second preset condition includes that the humidity in the accommodation chamber 112 is greater than or equal to the first humidity threshold, and the third preset condition includes that the humidity in the accommodation chamber 112 reaches the second humidity threshold, and the second humidity threshold is less than the first humidity threshold. Exemplarily, the second humidity threshold may be 15% to 30%, for example, it may be 15%, 18%, 20%, 22%, 25%, 28%, 30%, or a range composed of any two of them. This embodiment enables the humidity in the accommodation chamber 112 to be maintained between the first humidity threshold and the second humidity threshold when the environment is normal, so that the humidity in the accommodation chamber 112 is neither too high nor too low.

[0108] According to some embodiments of the present application, as Figure 1 and Figure 2 shown, the control unit 50 may specifically include a first controller 51 and a second controller 52. Both the first controller 51 and the second controller 52 can obtain detection signals. The first controller 51 is configured to control the on / off of the first gas path, and the second controller 52 is configured to control the on / off of the second gas path. The second controller 52 is communicatively connected to the third detection unit 70 and obtains environmental signals.

[0109] The first controller 51 and the second controller 52 can generate operation control signals according to the instruction operation code and the timing signal to complete the control of fetching instructions and executing instructions. Both the first controller 51 and the second controller 52 are communicatively connected to the first detection element. The first controller 51 is connected to the valve for controlling the on / off of the first gas path, and the second controller 52 is connected to the valve for controlling the on / off of the second gas path. In Figure 2 it, the second controller 52 is connected to the second valve 41. In Figure 2In this case, both the first controller 51 and the second controller 52 can be connected to the signal processor 53. Figure 2 The dashed line in this case may represent a signal line.

[0110] As a possible example, both the first controller 51 and the second controller 52 can acquire a detection signal and determine whether the detection signal meets a first preset condition. As a possible example, only the first controller 51 may determine whether the detection signal meets the first preset condition and send the determination result to the second controller 52.

[0111] Compared with the technical solution of simultaneously controlling the on / off of the first gas path and the second gas path by the same controller, in this embodiment, the first controller 51 and the second controller 52 are respectively controlled, which helps to simplify the control operation of a single controller.

[0112] According to some embodiments of the present application, the first controller 51 and the second controller 52 may also be communicatively connected. The first controller 51 sends communication information every second preset duration. The first controller 51 is electrically connected to the battery device 12. The second controller 52 may be configured to control the second gas path to conduct after determining that the battery device 12 is smoldering, in response to not acquiring the communication information within the second preset duration, so that the low-pressure gas storage tank 40 injects a second inert gas into the accommodation cavity 112.

[0113] The second preset duration can be reasonably set according to the actual working conditions. For example, it can be 3 seconds (s) to 10 s, specifically 3 s, 5 s, 6 s, 8 s, 10 s, or a range composed of any two of them. The communication information may be a heartbeat message, status data, a level signal, etc. When the communication information is not acquired within the second preset duration, it indicates that the first controller 51 and the second controller 52 are disconnected, and then the second controller 52 determines that the first controller 51 fails.

[0114] In this embodiment, when it is determined that the battery device 12 is smoldering, if the first controller 51 electrically connected to the battery device 12 fails due to being broken down by high voltage and cannot smoothly control the high-pressure gas storage tank 30 to inject the first inert gas into the accommodation cavity 112, the second controller 52 determines that the first controller 51 fails when the communication information is not acquired within the second preset duration, and then injects the second inert gas into the accommodation cavity 112 through the low-pressure gas storage tank 40, so as to reduce the possibility of the smoldering being converted into flaming combustion to a certain extent and reduce the risk of adjacent battery devices 12 being ignited.

[0115] In some embodiments, the second controller 52 may further be configured to issue a prompt message in response to not obtaining communication information within a second preset duration. The prompt message may be, but is not limited to, one or more of sound information, light information, image information, and text information. By issuing the prompt message, the operator can be prompted that the communication between the first controller 51 and the second controller 52 is disconnected. In this way, the operator can learn in time that the first controller 51 fails, and then perform maintenance on the first controller 51 as early as possible.

[0116] Figure 3 FIG. 4 is a schematic diagram of the principle of injecting gas from the low-pressure gas storage tank 40 of the energy storage system 100 according to some other embodiments of the present application into the cabinet 11. According to some embodiments of the present application, the energy storage system 100 may include a plurality of energy storage devices 10, a first detection unit 20, a third detection unit 70, a high-pressure gas storage tank 30, and a first controller 51 that are consistent with the number of the energy storage devices 10. Each first detection unit 20, each third detection unit 70, each high-pressure gas storage tank 30, and each first controller 51 are provided in one energy storage device 10. The plurality of energy storage devices 10 are controlled by the same second controller 52, and the accommodation cavities 112 of the plurality of energy storage devices 10 are communicated with the same low-pressure gas storage tank 40.

[0117] The plurality of energy storage devices 10 may be arranged in series and / or in parallel. In Figure 3 FIG. 4, two energy storage devices 10 are shown. Correspondingly, there are two first detection units 20, second detection units 22, third detection units 70, high-pressure gas storage tanks 30, liquid storage containers 60, and first controllers 51. Each energy storage device 10 is provided with a first detection unit 20, a second detection unit 22, a third detection unit 70, a high-pressure gas storage tank 30, a liquid storage container 60, and a first controller 51. Of course, in other embodiments, the number of energy storage devices 10 may also be three, four, or more.

[0118] In some embodiments, such as Figure 3As shown, the energy storage system 100 may include a main pipeline 44, a first branch pipeline, and a second branch pipeline. One end of the main pipeline 44 is communicated with the air outlet of the low-pressure gas storage tank 40, and the other end of the main pipeline 44 is connected to both the first branch pipeline and the second branch pipeline. The first branch pipeline extends into the accommodation cavity 112 of one of the energy storage devices 10 and is communicated with the accommodation cavity 112. Then, the main pipeline 44 is connected to the first branch pipeline to form a second gas path between the low-pressure gas storage tank 40 and one of the energy storage devices 10. The second branch pipeline extends into the accommodation cavity 112 of the other energy storage device 10 and is communicated with the accommodation cavity 112. Then, the main pipeline 44 is connected to the second branch pipeline to form a second gas path between the low-pressure gas storage tank 40 and the other energy storage device 10. Wherein, second valves 41 are provided on both the first branch pipeline and the second branch pipeline, and a control valve 45 is provided on the main pipeline 44. The control valve 45 can control the on-off of the main pipeline 44.

[0119] In this embodiment, by providing the main pipeline 44, a part of the second gas paths corresponding to the two energy storage devices 10 is shared. By providing the control valve 45, when both of the two energy storage devices 10 meet the conditions that the battery device 12 is not smoldering and the environment of the accommodation cavity 112 is normal, only one valve (i.e., the control valve 45) needs to be controlled to close, so that the second inert gas can be simultaneously not injected into the accommodation cavities 112 of the two energy storage devices 10, and it is not necessary to control the two second valves 41 to close.

[0120] On this basis, by providing the second valves 41 on both the first branch pipeline and the second branch pipeline, when the control valve 45 is opened and one of the two second valves 41 is opened, the second inert gas can be separately injected into the accommodation cavity 112 of one of the two energy storage devices 10. This can adapt to the usage scenarios where one of the two energy storage devices 10 meets the condition that the battery device 12 is smoldering or the battery device 12 is not smoldering and the environment of the accommodation cavity 112 is abnormal.

[0121] This embodiment enables the energy storage system 100 to integrate multiple energy storage devices 10, so as to provide a large amount of electric energy for electrical equipment. Moreover, it is designed that multiple energy storage devices 10 are controlled by the same second controller 52, which is convenient for management and has a wider range of applicable scenarios.

[0122] According to some embodiments of the present application, the energy storage system 100 may further include an alarm 114. The control unit 50 may also be configured to send an alarm signal after determining that the battery device 12 is smoldering, and the alarm 114 obtains the alarm signal and gives an alarm. As Figure 1 As shown, the energy storage system 100 may further include an alarm 114, and the alarm 114 is communicatively connected to the control unit 50. In the embodiment where the control unit 50 includes the above-mentioned first controller 51 and the above-mentioned second controller 52, the alarm 114 may specifically be communicatively connected to the first controller 51. Wherein, as Figure 1As shown, the alarm 114 can be set on the cabinet body 11, or can also be set outside the cabinet body 11. The alarm information emitted by the alarm 114 can be, but is not limited to, one or more of sound information, light information, image information, and text information. For example, the alarm 114 can be a buzzer, etc. In this embodiment, the alarm operation is performed by the alarm 114, so that the operator can learn in time that the battery device 12 has a smoldering fire and can take corresponding measures in time.

[0123] According to some embodiments of the present application, the battery device 12 is connected to an electrical device through a circuit, and the circuit is provided with a circuit breaker. The control unit 50 can also be configured to control the circuit breaker to disconnect after determining that the battery device 12 has a smoldering fire. By cutting off the circuit between the battery device 12 and the electrical device after determining that the battery device 12 has a smoldering fire, it is beneficial to improve the reliability of the energy storage system 100. Of course, in other embodiments, the control unit 50 can also be configured to control other circuit breakers of the energy storage device 10 to disconnect after determining that the battery device 12 has a smoldering fire to ensure reliability.

[0124] According to some embodiments of the present application, the energy storage system 100 can further include an inert gas generator 80, and the inert gas generator 80 is connected to the low-pressure gas storage tank 40 through a connecting pipe 81. The control unit 50 can also be configured to control the inert gas generator 80 to generate a second inert gas while controlling the second gas path to be conducted, and fill the low-pressure gas storage tank 40 with the second inert gas through the connecting pipe 81. The inert gas generator 80 is used to generate the second inert gas. Specifically, when the control unit 50 controls the second gas path to be conducted, it issues a gas production instruction, and the inert gas generator 80 obtains the gas production instruction and generates the second inert gas. This embodiment enables the inert gas generator 80 to continuously supply the second inert gas to the low-pressure gas storage tank 40 when the low-pressure gas storage tank 40 fills the accommodation chamber 112 with the second inert gas, so as to solve the problem of the limited storage volume of the low-pressure gas storage tank 40.

[0125] In some embodiments, the energy storage system 100 can further include a capacity detection unit, and the capacity detection unit is used to detect the gas volume in the low-pressure gas storage tank 40 and issue a gas volume signal. The control unit 50 can also be configured to, after controlling the inert gas generator 80 to generate the second inert gas, in response to the environmental signal meeting the third preset condition, determine that the environment of the accommodation chamber 112 is normal, then obtain the gas volume signal, and in response to the gas volume signal indicating that the low-pressure gas storage tank 40 is full, control the inert gas generator 80 to stop.

[0126] The capacity detection unit can specifically be implemented as any one of a pressure sensor 73, a mass flowmeter, etc. The gas volume signal is used to indicate whether the low-pressure gas storage tank 40 is full, that is, to indicate whether the gas volume in the low-pressure gas storage tank 40 reaches the maximum allowable gas volume.

[0127] In this embodiment, when the battery device 12 is not smoldering and the environment in the accommodation chamber 112 is abnormal, while the low-pressure gas storage tank 40 fills the accommodation chamber 112 with the second inert gas, the inert gas generator 80 supplies the second inert gas to the low-pressure gas storage tank 40 until the environment in the accommodation chamber 112 returns to normal. Then, the low-pressure gas storage tank 40 stops filling the accommodation chamber 112 with the second inert gas, and continues to determine whether the low-pressure gas storage tank 40 is full. If it is not full, the second inert gas continues to be supplied to the low-pressure gas storage tank 40. If it is full, the second inert gas is no longer supplied to the low-pressure gas storage tank 40. In this way, the low-pressure gas storage tank 40 has sufficient gas volume, enabling the energy storage system 100 to operate reliably subsequently.

[0128] In some embodiments, the energy storage system 100 may further include a start-stop button 116. When the start-stop button 116 is pressed, the energy storage system 100 stops operating. In this way, in an emergency, the operator can operate the start-stop button 116 to stop the energy storage system 100, which is conducive to ensuring safety. As shown in Figure 1 ..., the start-stop button 116 can be set on the cabinet 11 or outside the cabinet 11.

[0129] An embodiment of the second aspect of the present application provides a control method for an energy storage system 100. The implementation solution provided by this control method to solve problems is similar to the implementation solution described in the above energy storage system 100. Therefore, the specific limitations in one or more embodiments of the control method for the energy storage system 100 provided below can refer to the limitations on the energy storage system 100 in the above text, and the repeated content will not be elaborated too much.

[0130] Figure 4 is a schematic flowchart of the control method for the energy storage system 100 according to some embodiments of the present application. This control method is applied to any of the above energy storage systems 100. As shown in Figure 4 ..., this control method includes the following steps S10 to S20.

[0131] S10, obtain a detection signal.

[0132] S20, in response to the detection signal satisfying the first preset condition, determine that the battery device 12 is smoldering, control the first gas path to conduct and the second gas path to cut off, so that the high-pressure gas storage tank 30 injects the first inert gas into the accommodation chamber 112, making the oxygen concentration in the accommodation chamber 112 lower than the safety threshold, and then control the second gas path to conduct, so that the low-pressure gas storage tank 40 injects the second inert gas into the accommodation chamber 112.

[0133] The control method of this embodiment enables the energy storage system 100 to detect the smoldering (flameless combustion) of the battery device 12 at an early stage through the obtained detection signal during the actual operation when a thermal runaway occurs in a battery cell. First, the high-pressure gas storage tank 30 quickly injects the first inert gas into the accommodation chamber 112, so as to quickly reduce the oxygen concentration in the accommodation chamber 112 when smoldering occurs, and inhibit the oxygen concentration (one of the three elements of combustion) before a fire breaks out. This can reduce the possibility of the smoldering converting into flaming combustion to a certain extent, enabling the battery cell with thermal runaway to burn out spontaneously in the smoldering state (i.e., stop burning by itself), which is beneficial to reducing the risk of igniting adjacent battery devices 12. In addition, after quickly injecting the first inert gas into the accommodation chamber 112, the low-pressure gas storage tank 40 injects the second inert gas into the accommodation chamber 112, so as to maintain a low-oxygen environment in the accommodation chamber 112 on the premise of inhibiting the combustion reaction of the battery device 12, which can reduce the possibility of the battery device 12 reigniting. In summary, this can help improve the reliability of the energy storage system 100.

[0134] Optionally, the control method may further include S10. S30, obtaining a temperature signal.

[0135] In this embodiment, the specific implementation process of S20 may include steps S21 to S23.

[0136] S21, in response to the detection signal satisfying the first preset condition, determining that the battery device 12 is smoldering, controlling the first gas path to conduct and the second gas path to cut off, so that the high-pressure gas storage tank 30 injects the first inert gas into the accommodation chamber 112.

[0137] S22, in response to the temperature signal being not less than the temperature threshold, controlling the spraying device to spray coolant into the accommodation chamber 112.

[0138] S23, controlling the second gas path to conduct, so that the low-pressure gas storage tank 40 injects the second inert gas into the accommodation chamber 112.

[0139] Optionally, S23 may specifically be to control the second gas path to conduct after delaying for the first preset duration, and within the first preset duration, the first inert gas in the high-pressure gas storage tank 30 is injected into the accommodation chamber 112 along the first gas path. Among them, the order of steps S22 and S23 is not limited. S22 may be executed before S23 or after S23.

[0140] Optionally, the control method may further include steps S40 and S50.

[0141] S40, in response to the detection signal not satisfying the first preset condition, obtaining an environmental signal.

[0142] S50. In response to the environmental signal satisfying the second preset condition, determine that the environment in the accommodation chamber 112 is abnormal, and control the second gas path to conduct, so that the low-pressure gas storage tank 40 injects the second inert gas into the accommodation chamber 112.

[0143] Optionally, after S50, the control method may further include steps S60 and S70.

[0144] S60. Obtain the environmental signal.

[0145] S70. In response to the environmental signal satisfying the third preset condition, determine that the environment in the accommodation chamber 112 is normal, and control the second gas path to cut off.

[0146] Optionally, S21 may specifically be: in response to the detection signal satisfying the first preset condition, determine that the battery device 12 is smoldering, control the first gas path to conduct and the second gas path to cut off, so that the high-pressure gas storage tank 30 injects the first inert gas into the accommodation chamber 112, and at the same time send an alarm signal to the alarm 114, and the alarm signal is used to trigger the alarm 114 to perform an alarm operation.

[0147] Optionally, S21 may specifically be: in response to the detection signal satisfying the first preset condition, determine that the battery device 12 is smoldering, control the first gas path to conduct and the second gas path to cut off, so that the high-pressure gas storage tank 30 injects the first inert gas into the accommodation chamber 112, and at the same time control the circuit breaker to disconnect.

[0148] Optionally, S50 may specifically be: in response to the environmental signal satisfying the second preset condition, determine that the environment in the accommodation chamber 112 is abnormal, control the second gas path to conduct, so that the low-pressure gas storage tank 40 injects the second inert gas into the accommodation chamber 112, and at the same time control the inert gas manufacturing machine 80 to manufacture the second inert gas, and fill the second inert gas into the low-pressure gas storage tank 40 through the connecting pipe 81. Further, after the above S70, the control method may further include steps S80 and S90.

[0149] S80. Obtain the gas volume signal.

[0150] S90. In response to the gas volume signal indicating that the low-pressure gas storage tank 40 is full, control the inert gas manufacturing machine 80 to stop.

[0151] Figure 5 This is a schematic structural diagram of a computing device provided by an embodiment of the present application. An embodiment of the third aspect of the present application further provides a computing device 200, and the computing device 200 includes: at least one processor 201 and a memory 202. Optionally, the computing device 200 further includes a communication component 203. Among them, the processor 201, the memory 202, and the communication component 203 are connected through a bus 204.

[0152] In a specific implementation process, at least one processor 201 executes computer-executable instructions stored in a memory 202, so that the at least one processor 201 executes the above-mentioned method. For the specific implementation process of the processor 201, reference can be made to the above-mentioned method embodiment, and its implementation principle and technical effects are similar, which will not be elaborated here in this embodiment.

[0153] In the above embodiments, it should be understood that the processor may be a central processing unit (Central Processing Unit, abbreviated as: CPU), or may also be other general-purpose processors, digital signal processors (Digital Signal Processor, abbreviated as: DSP), application specific integrated circuits (Application Specific Integrated Circuit, abbreviated as: ASIC), etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the invention can be directly embodied as being executed by a hardware processor, or can be executed by a combination of hardware and software modules in the processor.

[0154] The memory may include a high-speed memory (Random Access Memory, RAM), and may also include a non-volatile memory (Non-volatile Memory, NVM), such as at least one disk memory.

[0155] The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the sake of convenience in representation, the buses in the drawings of this application are not limited to only one bus or one type of bus.

[0156] The embodiment of the present application also provides a computer-readable storage medium, on which instructions are stored, and when the instructions are executed alone or jointly by one or more processors of a computing device, the computing device is enabled to execute the method in any of the above embodiments.

[0157] A computer-readable storage medium includes volatile and non-volatile, removable and non-removable media implemented by any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. The computer-readable storage medium includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD), or other optical storage devices, magnetic cassettes, tapes, magnetic disk storage devices or other magnetic storage devices, or any other non-transmissive medium that can be used to store information for access by a computing device.

[0158] An embodiment of the present application also provides a computer program product, including instructions that, when executed alone or jointly by one or more processors of a computing device, cause the computing device to execute the method in any of the above embodiments.

[0159] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented in accordance with the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically exemplified below.

[0160] A specific embodiment of the present application is described below. It should be understood that this specific embodiment is only described for the purpose of illustration and should not be construed as a limitation of the present application.

[0161] As Figure 1 shown, the energy storage system 10 includes a cabinet 11 and one or more battery clusters, and the battery clusters are accommodated in the cabinet 11. The battery cluster may include a plurality of battery devices 12. A partition 111 is provided in the cabinet 11, and the partition 111 divides the interior of the cabinet 11 into a receiving cavity 112 and an installation cavity 113. The battery cluster is accommodated in the receiving cavity 112, and an alarm 114 and a start-stop button 116 are provided on the cabinet 11. The battery device 12 is connected to the electrical equipment through a circuit, and a circuit breaker is provided in the circuit.

[0162] The energy storage system 100 further includes a first controller 51, a second controller 52, a high-pressure gas storage tank 30, a low-pressure gas storage tank 40, a liquid storage container 60, and two smoke concentration sensors 21 and two temperature sensors provided on the cabinet 11.

[0163] The high-pressure gas storage tank 30 stores nitrogen. The high-pressure gas storage tank 30 is connected to the accommodation chamber 112 through a first gas path. The low-pressure gas storage tank 40 stores nitrogen. The low-pressure gas storage tank 40 is connected to the accommodation chamber 112 through a second gas path. The pressure of the high-pressure gas storage tank 30 is greater than or equal to 15 MPa and less than or equal to 20 MPa, and the pressure of the low-pressure gas storage tank 40 is greater than or equal to 0.4 MPa and less than or equal to 0.6 MPa. The liquid storage container 60 and the high-pressure gas storage tank 30 can both be accommodated in the installation chamber 113. The low-pressure gas storage tank 40 is arranged outside the cabinet body 11 and is connected to an inert gas generator 80 arranged outside the cabinet body 11 through a connecting pipe 81. The liquid storage container 60 is communicated with a spraying device arranged in the accommodation chamber 112.

[0164] The smoke concentration sensor 21 is used to detect the smoke concentration in the accommodation chamber 112 and send out a smoke concentration signal. The temperature sensor is used to detect the temperature in the accommodation chamber 112 and send out a temperature signal. The first controller 51 and the second controller 52 are both communicatively connected to the smoke concentration sensor 21 and the temperature sensor so as to be able to receive the smoke concentration signal and the temperature signal. The first controller 51 can control the on-off of the first gas path, and the second controller 52 can control the on-off of the second gas path. The first controller 51 is arranged on the cabinet body 11, and the second controller 52 is arranged outside the cabinet body 11. The first controller 51 is communicatively connected to the second controller 52. The first controller 51 sends out communication information every second preset time period, and the first controller 51 is electrically connected to the battery device 12.

[0165] The energy storage system 100 further includes a humidity sensor 71, an oxygen concentration sensor 72, a pressure sensor 73 and a capacity detection unit communicatively connected to the second controller 52. The humidity sensor 71 is used to detect the ambient humidity of the accommodation chamber 112, the oxygen concentration sensor 72 is used to detect the oxygen concentration of the accommodation chamber 112, the pressure sensor 73 is used to detect the air pressure of the accommodation chamber 112, and the capacity detection unit is used to detect the gas volume in the low-pressure gas storage tank 40.

[0166] The control process of the energy storage system 100 can be as follows: Step 1) Obtain the smoke concentration signal and the temperature signal; Step 2) In response to the smoke concentration signal satisfying a first preset condition, determine that the battery device 12 is smoldering, control the first gas path to be conducted and the second gas path to be cut off, so that the high-pressure gas storage tank 30 injects nitrogen into the accommodation chamber 112; the first preset condition is that the smoke concentration in the accommodation chamber 112 reaches a preset smoke concentration, and at the same time, send an alarm signal to the alarm 114 and control the circuit breaker to trip; Step 3) In response to the temperature signal indicating that the temperature in the accommodation chamber 112 is not less than the temperature threshold, control the spraying device to spray coolant into the accommodation chamber 112; Step 4) Delay for 3 to 5 minutes to control the second gas path to conduct, so that the low-pressure gas storage tank 40 injects nitrogen into the accommodation chamber 112, and the nitrogen in the high-pressure gas storage tank 30 has been exhausted when the second gas path conducts; Step 5) In response to the smoke concentration signal not meeting the first preset condition, obtain the signals sent by the humidity sensor 71, the oxygen concentration sensor 72, and the pressure sensor 73; Step 6) Determine whether the humidity of the accommodation chamber 112 is not less than 40%; if so, control the second gas path to conduct, so that the low-pressure gas storage tank 40 injects nitrogen into the accommodation chamber 112; Step 7) Obtain the signal sent by the humidity sensor 71, and determine that the humidity of the accommodation chamber 112 reaches 20%; if so, control the second gas path to cut off; Step 8) Determine whether the oxygen concentration of the accommodation chamber 112 is not less than 9%; if so, control the second gas path to conduct, so that the low-pressure gas storage tank 40 injects nitrogen into the accommodation chamber 112; Step 9) Obtain the signal sent by the oxygen concentration sensor, and determine that the oxygen concentration of the accommodation chamber 112 reaches 4%; if so, control the second gas path to cut off; Step 10) Determine whether the difference between the air pressure in the accommodation chamber 112 and the atmospheric pressure is within [50 Pa, 100 Pa]; if so, control the second gas path to conduct, so that the low-pressure gas storage tank 40 injects nitrogen into the accommodation chamber 112; Step 11) Obtain the signal sent by the pressure sensor 73, and determine whether the difference between the air pressure in the accommodation chamber 112 and the atmospheric pressure is within [300 Pa, 1000 Pa]; if so, control the second gas path to cut off.

[0167] When controlling the second gas path to conduct in Step 6), Step 8), and Step 10), it is also controlled to make the inert gas generator 80 produce the second inert gas, and the second inert gas is filled into the low-pressure gas storage tank 40 through the connecting pipe 81. Further, after controlling the second gas path to cut off, according to the gas path detected by the capacity detection unit, when the low-pressure gas storage tank 40 is full, the inert gas generator 80 is controlled to stop operating.

[0168] The above Step 3) can also be after Step 4). In this example, when the battery device 12 does not undergo smoldering combustion, nitrogen is injected into the accommodation chamber 112 through the low-pressure gas storage tank 40, so that the accommodation chamber 112 is in a low-oxygen environment. When the battery device 12 does not undergo smoldering combustion, first, nitrogen is quickly injected into the accommodation chamber 112 through the high-pressure gas storage tank 30 to quickly reduce the oxygen concentration in the accommodation chamber 112 to the safety threshold, and then nitrogen is injected into the accommodation chamber 112 through the low-pressure gas storage tank 40, so that the oxygen concentration in the accommodation chamber 112 is maintained below the safety threshold, and then spraying is performed.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An energy storage system, characterized in that, Comprising: An energy storage device, including a cabinet body and a battery device. The cabinet body has a receiving cavity, and the battery device is received in the receiving cavity; A first detection unit, at least for detecting the smoke concentration in the receiving cavity and sending out a detection signal, and the detection signal at least includes a smoke concentration signal; A high-pressure gas storage tank, which is communicated with the receiving cavity through a first gas path, and the first gas path can be opened and closed; A low-pressure gas storage tank, which is communicated with the receiving cavity through a second gas path, and the second gas path can be opened and closed; A control unit, configured to obtain the detection signal, in response to the detection signal satisfying a first preset condition, determine that the battery device is smoldering, control the first gas path to be conducted and the second gas path to be cut off, so that the high-pressure gas storage tank injects a first inert gas into the receiving cavity, making the oxygen concentration in the receiving cavity lower than the safety threshold, and then control the second gas path to be conducted, so that the low-pressure gas storage tank injects a second inert gas into the receiving cavity.

2. The energy storage system according to claim 1, characterized in that The energy storage system further includes a second detection unit, a liquid storage container and a spraying device communicated with the liquid storage container; the second detection unit is used for detecting the temperature in the receiving cavity and sending out a temperature signal; The control unit is configured to further obtain the temperature signal, and in response to the temperature signal indicating that the temperature in the receiving cavity is not less than the temperature threshold, after controlling the first gas path to be conducted and the second gas path to be cut off, control the spraying device to spray a cooling liquid into the receiving cavity.

3. The energy storage system according to claim 2, wherein A partition is provided in the cabinet body, and the partition divides the interior of the cabinet body into the receiving cavity and an installation cavity. The liquid storage container and the high-pressure gas storage tank are received in the installation cavity, and the low-pressure gas storage tank is arranged outside the cabinet body.

4. The energy storage system according to claim 1, wherein The control unit is configured to, after controlling the first gas path to be conducted and the second gas path to be cut off, delay a first preset duration to control the second gas path to be conducted, and within the first preset duration, the first inert gas in the high-pressure gas storage tank is injected into the receiving cavity along the first gas path.

5. The energy storage system according to claim 1, wherein The energy storage system further includes a third detection unit, and the third detection unit is used for detecting the environment of the receiving cavity and sending out an environment signal; The control unit is configured to, in response to the detection signal not satisfying the first preset condition, obtain the environment signal, and in response to the environment signal satisfying a second preset condition, determine that the environment of the receiving cavity is abnormal, and control the second gas path to be conducted, so that the low-pressure gas storage tank injects a second inert gas into the receiving cavity.

6. The energy storage system according to claim 5, wherein The third detection unit includes at least one of a humidity sensor, an oxygen concentration sensor and a pressure sensor. The humidity sensor is used for detecting the environmental humidity of the receiving cavity, the oxygen concentration sensor is used for detecting the oxygen concentration of the receiving cavity, and the pressure sensor is used for detecting the air pressure of the receiving cavity.

7. The energy storage system according to claim 5, wherein The control unit is configured to, after determining that the environment of the receiving cavity is abnormal and controlling the second gas path to be conducted, further obtain the environment signal, and in response to the environment signal satisfying a third preset condition, determine that the environment of the receiving cavity is normal, and control the second gas path to be cut off.

8. The energy storage system according to claim 7, wherein The third detection unit includes a pressure sensor for detecting the air pressure in the accommodation chamber. The second preset condition includes that the difference between the air pressure in the accommodation chamber and the atmospheric pressure is within a first pressure range. The third preset condition includes that the difference between the air pressure in the accommodation chamber and the atmospheric pressure is within a second pressure range. The pressure in the first pressure range is positive, the pressure in the second pressure range is greater than the pressure in the first pressure range, and the sum of the upper limit value of the second pressure range and the atmospheric pressure is less than the pressure of the low-pressure gas storage tank.

9. The energy storage system according to claim 8, wherein The pressure of the high-pressure gas storage tank is greater than or equal to 15 MPa and less than or equal to 20 MPa, the pressure of the low-pressure gas storage tank is greater than or equal to 0.4 MPa and less than or equal to 0.6 MPa, and the second pressure range is 300 Pa to 1000 Pa.

10. The energy storage system according to claim 7, wherein The third detection unit includes an oxygen concentration sensor for detecting the oxygen concentration in the accommodation chamber. The second preset condition includes that the oxygen concentration in the accommodation chamber is greater than or equal to a first oxygen concentration threshold. The third preset condition includes that the oxygen concentration in the accommodation chamber reaches a second oxygen concentration threshold. The first oxygen concentration threshold is greater than the second oxygen concentration threshold, and the second oxygen concentration threshold is positive.

11. The energy storage system according to claim 5, wherein The control unit includes a first controller and a second controller. Both the first controller and the second controller can obtain the detection signal. The first controller is configured to control the on / off of the first gas path. The second controller is configured to control the on / off of the second gas path. The second controller is communicatively connected to the third detection unit and obtains the environmental signal.

12. The energy storage system according to claim 11, wherein, The first controller is communicatively connected to the second controller. The first controller sends communication information every second preset time period. The first controller is electrically connected to the battery device. The second controller is configured to, after determining that the battery device is smoldering, in response to not obtaining the communication information within the second preset time period, control the second gas path to conduct, so that the low-pressure gas storage tank injects a second inert gas into the accommodation chamber.

13. The energy storage system according to claim 11, wherein The energy storage system includes a plurality of the energy storage devices, and the first detection unit, the third detection unit, the high-pressure gas storage tank, and the first controller with the same quantity as the energy storage devices. Each of the first detection units, each of the third detection units, each of the high-pressure gas storage tanks, and each of the first controllers is disposed on one of the energy storage devices. A plurality of the energy storage devices are controlled by the same second controller. The accommodation chambers of the plurality of the energy storage devices are communicated with the same low-pressure gas storage tank.

14. The energy storage system according to any one of claims 1 to 13, characterized in that, The energy storage system further includes an alarm. The control unit is further configured to, after determining that the battery device is smoldering, send an alarm signal. The alarm obtains the alarm signal and gives an alarm; and / or, The battery device is connected to an electrical device through a circuit. The circuit is provided with a circuit breaker. The control unit is further configured to, after determining that the battery device is smoldering, control the circuit breaker to trip.

15. The energy storage system according to any one of claims 1 to 13, characterized in that, The energy storage system further comprises an inert gas production machine, which is connected to the low-pressure gas storage tank via a connecting pipe; The control unit is configured to control the second gas path to be open while also controlling the inert gas production machine to produce the second inert gas and to fill the second inert gas into the low-pressure gas storage tank through the connecting pipe.

16. A control method for an energy storage system, applied to the energy storage system according to any one of claims 1 to 15, characterized in that, The control method includes: acquiring the detection signal; In response to the detection signal satisfying a first preset condition, it is determined that the battery device is smoldering, the first gas path is controlled to be open and the second gas path is controlled to be shut off, so that the high-pressure gas storage tank injects a first inert gas into the accommodating chamber, so that the oxygen concentration in the accommodating chamber is lower than a safety threshold, and then the second gas path is controlled to be open, so that the low-pressure gas storage tank injects a second inert gas into the accommodating chamber.

17. A computing device, characterized in that, include: at least one processor; as well as At least one memory is communicatively connected to the at least one processor, the at least one memory storing instructions, which, when executed individually or collectively by the at least one processor, cause the computing device to perform the method of claim 16.

18. A computer-readable storage medium, characterized in that, Instructions are stored which, when executed individually or collectively by one or more processors of a computing device, cause the computing device to perform the method of claim 16.

19. A computer program product, characterized in that, The method comprises instructions that, when executed individually or collectively by one or more processors of a computing device, cause the computing device to perform the method of claim 16 .

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