Interference-free fire-fighting monitoring device and method for sodium-ion battery energy storage system

Abstract

The invention relates to the technical field of new energy storage power station safety, and discloses an interference-free fire-fighting monitoring device and method for a sodium-ion battery energy storage system, the device is applied to the sodium-ion battery energy storage system, the device comprises a collection unit, the collection unit comprises a collection pipe arranged on a battery pack, and the collection pipe is used for collecting gas of the battery pack; the detection unit comprises a monitoring box arranged on one side of the battery pack; a detection assembly is arranged in the monitoring box, and an information processing module is arranged on the monitoring box; the collection pipe is communicated with the monitoring box, and the detection assembly detects whether collected gas contains target gas or not, generates a detection signal and sends the detection signal to the information processing module; the information processing module is used for processing the detection signal and judging whether the target gas content exceeds a preset content threshold value or not, and if the target gas content exceeds the preset content threshold value, early warning is triggered. According to the invention, the influence of interference gas can be eliminated, accurate detection of target gas is realized, and the safety of the sodium ion battery energy storage system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of safety of new energy storage power stations, and in particular to an interference-free fire monitoring device and method for a sodium ion battery energy storage system. Background Art

[0002] The energy storage fire protection system consists of two parts: the monitoring system and the fire extinguishing linkage control system. The monitoring module is an effective means of early warning of thermal runaway of energy storage batteries and is suitable for battery pack-level safety control of energy storage systems. During the monitoring stage, the energy storage fire protection system monitors abnormal conditions in the battery pack environment in real time through temperature, gas and other sensors. Once a fire signal is detected, it immediately enters the emergency treatment stage, activates the fire extinguishing system, and realizes fire safety linkage.

[0003] As an effective alternative to lithium-ion batteries in the field of energy storage, sodium-ion batteries have a high content of combustible gas CO in the gas components of thermal runaway, which is a good gas for thermal runaway warning. Existing electrochemical energy storage systems usually use electrochemical sensors as a means of gas monitoring. They are highly sensitive, compact, and simple in structure, but their disadvantages are that they are not selective enough and are easily interfered by gases with similar electrolysis potentials. The hydrogen continuously released by some system auxiliary materials during use will seriously affect the detection of carbon monoxide target gas in the energy storage battery pack, affecting the normal operation of the energy storage fire protection system and failing to ensure safe and reliable operation of the battery. Summary of the invention

[0004] In view of the problem in the prior art that sodium ion batteries are interfered by gases with similar electrolysis potentials and are difficult to detect target gases, resulting in low battery safety, the present invention provides an interference-free fire monitoring device and method for a sodium ion battery energy storage system, which can eliminate the influence of interfering gases, achieve accurate detection of target gases, and improve battery safety. The specific technical solution is as follows: An interference-free fire monitoring device for a sodium-ion battery energy storage system is applied to the sodium-ion battery energy storage system and is used to monitor a sodium-ion battery pack, comprising: A collection unit, the collection unit comprising a collection tube disposed on the battery pack, the collection tube being used to collect gas from the battery pack; A detection unit, the detection unit comprising a monitoring box disposed on one side of the battery pack; a detection component is disposed in the monitoring box, and an information processing module is disposed on the monitoring box; The collection tube is connected to the monitoring box, and the detection component detects whether the gas collected by the collection tube contains the target gas, and generates a detection signal to send to the information processing module; the information processing module processes the detection signal and determines whether the detected target gas content exceeds a preset content threshold, and if so, triggers an early warning.

[0005] Preferably, the collection tube includes a main collection tube and several groups of branch collection tubes; the several groups of branch collection tubes are arranged in parallel on the battery pack, and one end of the several groups of branch collection tubes is commonly connected to the main collection tube.

[0006] Preferably, an air inlet pipe is provided in the monitoring box, and the air inlet pipe is connected to the main collection pipe.

[0007] Preferably, a sampling pump and a solenoid valve are provided on the air inlet pipe; the solenoid valve is used to control the flow rate output by the sampling pump.

[0008] Preferably, the detection component includes an air chamber; the air chamber is arranged in the monitoring box; an air inlet and an air outlet are respectively arranged at two ends of the upper part of the air chamber; the air inlet is connected to the air inlet pipe.

[0009] Preferably, the air chamber is a multiple reflection light path infrared air chamber; an infrared light source and a detector are arranged in the air chamber.

[0010] Preferably, the wavelength emitted by the infrared light source is 4.67 μm or 4.72 μm.

[0011] Preferably, the detector is used to detect whether the battery pack contains the target gas and send the detection signal to the information processing module.

[0012] Preferably, the target gas is carbon monoxide, and the information processing module receives the detection signal of the detector and processes the detection signal to determine whether the detected carbon monoxide content exceeds a preset content threshold, and if so, triggers an early warning.

[0013] A non-interference fire monitoring method for a sodium ion battery energy storage system, applied to the non-interference fire monitoring device for the aforementioned sodium ion battery energy storage system, comprising: The gas at different positions in the battery pack is collected through the collection tube, and the collected gas is transmitted to the monitoring box; The detection component in the monitoring box is used to detect whether the collected gas contains the target gas, and a detection signal is generated and sent to the information processing module; The information processing module processes the detection signal and determines whether the detected target gas content exceeds the preset content threshold. If it exceeds, an early warning is triggered.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The interference-free fire monitoring device for the sodium-ion battery energy storage system of the present application can obtain the gas around the battery pack at close range and in real time by directly setting the collection tube on the battery pack, and quickly capture the extremely small amount of target gas released by the battery pack, thereby improving the detection sensitivity of the target gas. The detection component analyzes the gas transmitted from the collection tube, generates a detection signal when the target gas is found, and accurately analyzes the detection signal through the information processing module to determine whether the target gas content exceeds the preset threshold. When the target gas is detected and its content exceeds the threshold, an early warning is triggered. This device is interference-free, and the presence of other interfering gases in the surrounding area will not have a significant impact on the detection of the target gas, ensuring that the detection results truly reflect the actual situation of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0015] Figure 1 It is a schematic diagram of the overall structure of an interference-free fire monitoring device for a sodium ion battery energy storage system of the present invention.

[0016] Figure 2 It is a schematic diagram of the connection relationship of the detection units in the interference-free fire monitoring device of the sodium ion battery energy storage system of the present invention.

[0017] Figure 3 This is a principle demonstration diagram of a multiple reflection light path infrared gas chamber in an interference-free fire monitoring device of a sodium ion battery energy storage system of the present invention.

[0018] Figure 4 This is a flow chart of interference-free fire monitoring of a sodium ion battery energy storage system of the present invention.

[0019] The following are the descriptions of the reference numerals: 100-collection unit, 101-battery pack, 102-collection tube, 102a-branch collection tube, 102b main collection tube, 200-detection unit, 201-monitoring box, 201a-inlet pipe, 201b-sampling pump, 202-detection component, 202a-air chamber, 202b-air inlet, 202c-air outlet, 202d-infrared light source, 202e-detector, 203-information processing module. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be understood that when used in this specification, the terms "include" and "comprising" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0022] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0023] It should be further understood that the term “and / or” used in the specification of the present invention refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0024] See the following examples Figures 1 to 4 .

[0025] The present application embodiment provides an interference-free fire monitoring device for a sodium ion battery energy storage system, which is applied to the sodium ion battery energy storage system and is used to monitor a sodium ion battery pack 101, including: The collection unit 100 includes a collection tube 102 disposed on the battery pack 101, and the collection tube 102 is used to collect gas from the battery pack 101; The detection unit 200 includes a monitoring box 201 disposed on one side of the battery pack 101; a detection component 202 is disposed in the monitoring box 201, and an information processing module 203 is disposed on the monitoring box; The collection tube 102 is connected to the monitoring box 201, and the detection component 202 detects whether the gas collected by the collection tube 102 contains the target gas, and generates a detection signal and sends it to the information processing module 203; the information processing module 203 processes the detection signal and determines whether the detected target gas content exceeds a preset content threshold, and if so, triggers an early warning.

[0026] The interference-free fire monitoring device of the sodium-ion battery energy storage system of the present application realizes an interference-free design. Whether there are other interfering gases around, or the humidity and temperature fluctuate frequently, it will not have a significant impact on the detection of the target gas. It can accurately filter out external interference factors, ensure that the detection results truly reflect the actual situation of the battery pack 101, and enhance the reliability of the detection.

[0027] In this embodiment, by directly setting the collection tube 102 on the battery pack 101, the gas around the battery pack 101 can be acquired in real time at a close distance, and the extremely small amount of target gas released by the battery pack 101 can be quickly captured, thereby improving the detection sensitivity of the target gas. In this embodiment, the monitoring box 201 is disposed on one side of the battery pack 101 to accommodate the detection component 202 and the information processing module 203. The monitoring box 201 serves as a physical carrier of the detection unit 200, protecting the internal components and providing an operating platform.

[0028] At the same time, the detection component 202 analyzes the gas transmitted from the collection tube 102. When the target gas is found, a detection signal is generated, and the detection signal is accurately analyzed through the information processing module 203 to determine whether the target gas content exceeds the preset threshold. When the target gas is detected and its content exceeds the threshold, an early warning is triggered, and the battery safety hazard is detected at the initial stage. For example, when an abnormal reaction occurs inside the battery, a specific target gas begins to be released and the concentration rises, the early warning system is immediately activated, and measures such as stopping the battery operation and arranging professional maintenance can be quickly taken to effectively prevent serious accidents such as thermal runaway, fire and even explosion of the battery, and comprehensively improve battery safety. Specifically, the collection tube 102 includes a main collection tube 102b and several groups of branch collection tubes 102a; the several groups of branch collection tubes 102a are arranged in parallel on the battery pack 101, and one end of the several groups of branch collection tubes 102a is commonly connected to the main collection tube 102b.

[0029] In a specific implementation, since the battery pack 101 is the monitoring object of the monitoring device, the collection tube 102 is provided with several groups to form a transverse multi-branch structure, and several branch collection tubes 102a are arranged in parallel transversely, and one end of these branches is commonly connected to the longitudinal main collection tube 102b, forming a parallel branch but one-end concentrated connection mode, which can collect gas samples from different areas of the battery pack 101 more evenly, and effectively gather the gas in multiple branches to a centralized point, which is convenient for subsequent transportation and positioning.

[0030] Specifically, an air inlet pipe 201a is provided in the monitoring box 201, and the air inlet pipe 201a is connected to the main collection pipe 102b.

[0031] The air inlet pipe 201a is provided with a sampling pump 201b and a solenoid valve; the solenoid valve is used to control the flow rate output by the sampling pump 201b.

[0032] In this embodiment, the monitoring box 201 is connected to the main collection tube 102b through the air inlet pipe 201a. After the sampling pump 201b is started, suction will be generated to suck the gas in the main collection tube 102b into the monitoring box 201 through the air inlet pipe 201a. The solenoid valve adjusts the size of the channel through which the gas flows by controlling its own opening and closing degree, thereby achieving precise control of the output flow of the sampling pump 201b. The setting of the sampling pump 201b can actively extract gas, which improves the gas collection efficiency compared to natural diffusion and other methods, and can quickly obtain sufficient gas samples for monitoring. And through the control of the flow by the solenoid valve, the sampling volume can be flexibly adjusted according to different monitoring needs.

[0033] In a specific implementation, the air inlet pipe 201a is connected to the collection tube 102 to introduce the collected gas into the monitoring box 201. The sampling pump 201b is arranged on the air inlet pipe 201a to pump the gas from the collection tube 102 into the monitoring box 201. The solenoid valve controls the flow rate output by the sampling pump 201b to ensure a stable supply of gas. By controlling the flow rate, the gas collection speed and flow rate can be accurately controlled to improve the stability and accuracy of monitoring.

[0034] Specifically, the detection component 202 includes an air chamber 202a; the air chamber 202a is arranged in the monitoring box 201; the air inlet 202b and the air outlet 202c are respectively arranged at both ends of the upper part of the air chamber 202a; the air inlet 202b is connected to the air inlet pipe 201a.

[0035] The air chamber 202a is a multiple reflection light path infrared air chamber; an infrared light source 202d and a detector 202e are arranged in the air chamber 202a.

[0036] The wavelength of light emitted by the infrared light source 202d is 4.67 μm or 4.72 μm.

[0037] The detector 202e is used to detect whether the battery pack 101 contains the target gas and send a detection signal to the information processing module 203.

[0038] In a specific implementation, the air chamber 202a in the monitoring device adopts a multiple reflection optical path infrared air chamber design. After the collection tube 102 collects the gas around the battery pack 101, the gas enters the air chamber 202a through the air inlet pipe 201a, flows in from the air inlet 202b, and then flows out from the air outlet 202c. An infrared light source 202d is provided in the air chamber 202a, which emits infrared light with a wavelength of 4.67μm or 4.72μm. The air chamber 202a is designed to have a reflector structure, so that the infrared light is reflected multiple times in the air chamber 202a, and the optical path is greatly extended. During the propagation of light, if the target gas released by the battery pack 101 exists in the air chamber 202a, the gas molecules will absorb and scatter the infrared light of a specific wavelength. The detector 202e can capture the changes in these light signals, and then determine whether the battery pack 101 contains the target gas, and send the detection signal to the information processing module 203.

[0039] In the present embodiment, the air chamber 202a is a multiple reflection optical path infrared air chamber 202a, which is used to accommodate the infrared light source 202d and the detector 202e. The air chamber 202a is designed as a reflector so that the infrared light can be reflected multiple times therein, and the light can be reflected back and forth inside the air chamber 202a, thereby increasing the optical path length. Since the light is reflected multiple times in the air chamber 202a, the contact opportunity between the light and the gas molecules is increased, which means that even very low concentrations of gas can be effectively detected, thereby reducing the detection limit. This is crucial for early detection of small leaks or abnormal conditions in the battery pack 101, and the multiple reflection type design reduces the size of the monitoring module by achieving a longer optical path in a limited physical space, and is easy to install inside the battery pack 101 without taking up too much space. Inside the battery pack 101, space is a very valuable resource. The multiple reflection type design allows the monitoring module to adapt to limited space more flexibly without sacrificing performance, thereby improving space utilization.

[0040] Among them, the infrared light source 202d emits infrared light of a specific wavelength, which usually corresponds to the specific absorption wavelength of the target gas. The wavelength of 4.67μm or 4.72μm is the specific wavelength of infrared light absorbed by carbon monoxide. When the infrared light passes through the gas chamber 202a, if there is a target gas in the gas chamber 202a, these gas molecules will absorb the infrared light of the specific wavelength. The amount of light absorbed is proportional to the concentration of the target gas in the gas chamber 202a. The detector 202e detects the reflected infrared light to determine the content of carbon monoxide (target gas) in the collected gas. By detecting the infrared light of a specific wavelength, the presence and concentration of carbon monoxide can be accurately detected.

[0041] Among them, the change of infrared light intensity to determine the rise and fall of gas concentration is implemented according to the principle of Lambert-Beer's law. Lambert-Beer's law is a law that describes the attenuation of light when passing through a medium. It is usually used in spectroscopy, especially in absorption spectrum analysis. This law shows that the absorbance of light when passing through a medium is proportional to the concentration of the medium, the path length, and the attenuation coefficient of the light. In non-dispersive infrared monitoring technology, Lambert-Beer's law can be used to calculate the concentration of a specific gas (such as carbon monoxide) by measuring the change of infrared light intensity at a specific wavelength to determine the gas concentration.

[0042] Specifically, the information processing module 203 receives the detection signal of the detector 202e, and processes the detection signal to determine whether the detected target gas content exceeds a preset content threshold, and if so, triggers an early warning.

[0043] The information processing module 203 processes the data obtained by the detector 202e, and outputs the monitoring value to the fire protection system according to the result. Real-time monitoring and early warning of the carbon monoxide content in the battery pack 101 are realized, and the response speed and efficiency of the fire protection system are improved. When the carbon monoxide content of the gas in the battery pack 101 reaches or exceeds 500ppm, an early warning is triggered to ensure that timely measures are taken before the carbon monoxide content reaches a dangerous level to prevent the occurrence of fire accidents. In some embodiments, the information processing module 203 converts the detected gas concentration information into an electrical signal, and the electrical signal is converted into a digital signal. The processed data is calculated using a preset algorithm to obtain the actual concentration of the target gas.

[0044] The embodiment of the present application also provides a non-interference fire monitoring method for a sodium ion battery energy storage system, which is applied to the non-interference fire monitoring device for the aforementioned sodium ion battery energy storage system, comprising: S1, collecting gas from different positions in the battery pack 101 through the collection tube 102, and transmitting the collected gas to the monitoring box 201; The sampling points of the collection tube 102 are evenly distributed at multiple key positions of the battery pack 101, such as the electrode connection position, the cell interval, and near the vent of the battery pack 101. The collection tube 102 is tightly fixed to the battery pack 101 through a special connector to prevent the mixing of external gas. A gas pump is provided in the collection tube 102, which actively extracts gas samples from the corresponding positions in the battery pack 101 at preset time intervals, such as once every 10 seconds. The collected gas is transmitted through the pipeline and enters the gas buffer area in the monitoring box 201, waiting for further detection.

[0045] Through multi-point collection, different areas in the battery pack 101 can be fully covered to avoid missed detection due to uneven gas distribution in local locations. In addition, the setting of the gas buffer area ensures that the collected gas is not interfered by the outside world, providing reliable gas samples for subsequent detection.

[0046] S2, using the detection component 202 in the monitoring box 201 to detect whether the collected gas contains the target gas, and generate a detection signal to send to the information processing module 203; When the gas enters the gas buffer area of ​​the monitoring box 201, the gas chamber 202a (multiple reflection optical path infrared gas chamber 202a) in the detection component 202 starts to work. The gas flows in from the air inlet 202b at the top of the gas chamber 202a. In the gas chamber 202a, the infrared light source 202d emits infrared light with a wavelength of 4.67μm or 4.72μm. The light is reflected multiple times by the reflector in the gas chamber 202a and fully contacts the gas molecules. If the gas contains target gas, the target gas molecules will absorb infrared light of a specific wavelength, causing the light intensity to change. The detector 202e monitors the change in light intensity in real time and converts this change into an electrical signal. After amplification by the signal amplifier, a detection signal is generated and sent to the information processing module 203. The design of the infrared gas chamber 202a with multiple reflection paths greatly increases the chances of light contacting gas molecules, enabling the detection component 202 to detect extremely low concentrations of target gas, significantly improving the detection sensitivity. Accurate detection of light intensity changes and signal amplification processing ensure that the detection signal can truly reflect the presence of the target gas in the gas. S3. The information processing module 203 processes the detection signal and determines whether the detected target gas content exceeds a preset content threshold. If so, an early warning is triggered.

[0047] In some embodiments, after receiving the detection signal, the information processing module 203 filters the signal to remove the noise interference mixed in during the signal transmission process. At the same time, the processed signal strength is compared with the pre-stored target gas concentration-signal strength correspondence to calculate the currently detected target gas content. Then, the calculated target gas content is compared with the preset content threshold. If the target gas content exceeds the threshold, the information processing module 203 immediately sends a warning signal to related equipment (such as a computer in the monitoring center, a staff member's mobile phone, etc.) through a wireless communication module, such as Bluetooth, Wi-Fi or 4G module, and activates the local alarm at the same time. Whether it is remote communication or local alarm, personnel can be informed of safety hazards in battery pack 101 at the first time, so that they can take quick measures, such as stopping battery operation and conducting maintenance, etc., effectively avoiding the occurrence of serious safety accidents such as battery thermal runaway, fire or even explosion, and significantly improving the safety of sodium-ion batteries.

[0048] The working principle of the interference-free fire monitoring device of the sodium ion battery energy storage system of the present invention is as follows: Preparation stage: Distributed gas path covering battery pack 101 An S-shaped collection tube 102 is arranged inside the battery pack 101 to ensure that the gas path can cover various areas of the battery pack 101 so as to accurately obtain carbon monoxide information at different locations. One end of the collection tube 102 is connected to the air inlet pipe 201a in the monitoring box 201 to ensure that the gas sample can be smoothly transported from the battery pack 101 to the monitoring box 201.

[0049] Transportation stage: gas collection and transportation are completed using transportation components Start the sampling pump 201b on the air inlet pipe 201a, and begin to inhale the gas sample from the inside of the battery pack 101 through the collection tube 102. Control the output flow of the sampling pump 201b through the solenoid valve 201c to ensure that the gas sample is delivered to the monitoring box 201 at a stable speed and quantity.

[0050] Detection stage: Detection of gas is completed using detection component 202 The infrared light source 202d in the detection component 202 in the monitoring box 201 emits infrared light of specific wavelengths, which correspond to the absorption wavelengths of carbon monoxide. After the gas sample enters the air chamber 202a, the carbon monoxide molecules therein absorb the infrared light emitted by the infrared light source 202d. Due to the special design of the air chamber 202a, the infrared light is reflected multiple times in the air chamber 202a, which increases the chance of interaction with the gas molecules. The detector 202e is located at the other end of the air chamber 202a and is used to detect the infrared light after passing through the air chamber 202a. By measuring the attenuation degree of the infrared light, the detector 202e can determine the concentration of carbon monoxide in the air chamber 202a. The signal obtained by the detector 202e is sent to the information processing module 203, which is responsible for processing the signal and converting it into a reading of the gas concentration. If the detected carbon monoxide concentration reaches or exceeds the preset threshold, the information processing module 203 will trigger an early warning and output the monitoring amount to the fire protection system so that corresponding safety measures can be taken. The information processing module 203 outputs the detection results to the fire protection system for subsequent monitoring and emergency response.

[0051] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the specification, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to a variety of modifications that still fall within the inventive content of the description.

[0052] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention).

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the description of the present invention.

Claims

1. An interference-free fire monitoring device for a sodium ion battery energy storage system, characterized in that: Applied to sodium-ion battery energy storage system to monitor sodium-ion battery packs, including: A collection unit, the collection unit comprising a collection tube disposed on the battery pack, the collection tube being used to collect gas from the battery pack; A detection unit, the detection unit comprising a monitoring box disposed on one side of the battery pack; a detection component is disposed in the monitoring box, and an information processing module is disposed on the monitoring box; The monitoring box is provided with an air inlet pipe; the detection assembly includes an air chamber; the air chamber is provided in the monitoring box; an air inlet and an air outlet are provided at both ends of the upper part of the air chamber; the air inlet is connected to the air inlet pipe; an infrared light source and a detector are provided in the air chamber; The collection tube is connected to the air inlet pipe of the monitoring box, and the detector monitors the light intensity change of the infrared light source in real time, and determines whether the battery pack contains the target gas according to the light intensity change, and generates a detection signal to send to the information processing module; the information processing module processes the detection signal and determines whether the detected target gas content exceeds the preset content threshold, and if so, triggers an early warning.

2. The interference-free fire monitoring device for the sodium ion battery energy storage system according to claim 1 is characterized in that: The collection tubes include a main collection tube and several groups of branch collection tubes; the several groups of branch collection tubes are arranged in parallel on the battery pack, and one end of the several groups of branch collection tubes is commonly connected to the main collection tube.

3. The interference-free fire monitoring device for the sodium ion battery energy storage system according to claim 2, characterized in that: The air inlet pipe is communicated with the main air collecting pipe.

4. The interference-free fire monitoring device for the sodium ion battery energy storage system according to claim 3 is characterized in that: The air inlet pipe is provided with a sampling pump and a solenoid valve; the solenoid valve is used to control the flow rate output by the sampling pump.

5. The interference-free fire monitoring device for the sodium ion battery energy storage system according to claim 4, characterized in that: The air chamber is a multiple reflection light path infrared air chamber.

6. The interference-free fire monitoring device for the sodium ion battery energy storage system according to claim 5, characterized in that: The wavelength emitted by the infrared light source is 4.67 μm or 4.72 μm.

7. The interference-free fire monitoring device for the sodium ion battery energy storage system according to claim 1, characterized in that: The target gas is carbon monoxide. The information processing module receives the detection signal of the detector and processes the detection signal to determine whether the detected carbon monoxide content exceeds a preset content threshold. If so, an early warning is triggered.

8. A method for interference-free fire monitoring of a sodium ion battery energy storage system, characterized in that: The interference-free fire monitoring device applied to the sodium ion battery energy storage system according to any one of claims 1 to 7 comprises: The gas at different positions in the battery pack is collected through the collection tube, and the collected gas is transmitted to the monitoring box; The detection component in the monitoring box is used to detect whether the collected gas contains the target gas, and a detection signal is generated and sent to the information processing module; The information processing module processes the detection signal and determines whether the detected target gas content exceeds the preset content threshold. If it exceeds, an early warning is triggered.

Images