Charging chamber for lithium battery power supply in coal mine underground

Abstract

The present application provides a kind of coal mine underground lithium battery power supply charging chamber, including the chamber roadway of two lanes being provided with cable passage, ventilation main pipe and spray fire extinguishing system on ground;More than three charging chamber units are provided on one side in chamber roadway, and the charging chamber ground monitoring platform in communication connection with each charging chamber unit is provided on coal mine ground;Each charging chamber unit includes embedded room body with charger, monitoring substation, emergency backup power supply, further includes environmental monitoring assembly, infrared thermometer, audible and visual alarm, fire-fighting assembly and chamber unit isolation cover for sealing and isolating the lithium battery power supply vehicle or lithium battery power supply being charged in danger.The present application provides a reliable technical solution for how to achieve safe and efficient charging of numerous lithium battery power supply vehicles and rotating lithium battery power supply in coal mine through overall structural design, which is cost controllable and easy to implement and promote.

Description

Technical Field

[0001] This invention relates to the technical field of power lithium battery charging facilities for new energy vehicles, specifically to a lithium battery power supply charging chamber in an underground coal mine. Background Technology

[0002] Due to the significant advantages of lithium batteries over traditional lead-acid batteries, the power batteries used in underground coal mine vehicles have gradually transitioned from traditional lead-acid batteries to lithium batteries. Over time, vehicles powered by lithium batteries, such as explosion-proof lithium-ion trackless rubber-wheeled mining vehicles and lithium-ion battery loaders, are increasingly used in underground coal mines. However, this brings a significant challenge: how to safely and efficiently charge these numerous lithium-ion battery vehicles and equipment in the highly flammable and explosive environment of underground coal mines. The coal mining industry requires that power lithium batteries with a capacity exceeding 2kWh in underground coal mines must be charged in charging chambers. However, since the construction standards for underground charging chambers in the coal mining industry are still in the research and development stage, the charging chambers currently used by coal mining enterprises are relatively rudimentary, mainly employing two methods: First, to minimize the risk of combustion and explosion, only one power lithium battery-powered new energy vehicle or a single disassembled lithium battery is charged at a time within the underground roadway. While this method offers relatively good safety, it is obviously inefficient. To meet the charging needs of numerous new energy vehicles, multiple single-vehicle charging chambers would need to be repeatedly installed, which is clearly difficult and costly to implement in underground coal mines. The second method uses a roadway-style charging chamber, which involves setting up a dedicated roadway for charging, equipped with basic environmental monitoring and fire-fighting facilities. Multiple (three or more) charging chambers, each enclosed by a fence, are set up on the ground on the same side of the roadway. While the first method can simultaneously charge multiple new energy vehicles (or multiple lithium-ion batteries requiring swapping), significantly improving efficiency compared to the second method, it suffers from several problems. First, its safety decreases exponentially compared to the first method. If a fire breaks out at one charging station while multiple new energy vehicles are charging simultaneously, the fire, smoke, and toxic gases will quickly spread throughout the entire charging chamber tunnel. The existing basic fire-fighting measures in such tunnel-type charging chambers are insufficient to respond effectively, potentially leading to major safety accidents with personal injury and property damage. In other words, while the second method solves the efficiency problem, it lacks effective safety guarantees, resulting in a significant safety risk. Second, the charging machines are arranged in a row at intervals within the charging chamber tunnel and surrounded by fences. This requires ensuring both parking and charging lanes and vehicle access and rescue lanes, resulting in a wider charging chamber tunnel and increased construction costs.

[0003] To adapt to the needs of the new situation, the coal mining industry is currently accelerating research and development of technical solutions and standards for the construction of underground charging chambers in coal mines. From the perspective of patent applications, many enterprises and institutions are also actively researching technical solutions related to underground lithium battery power supply charging chambers in coal mines. For example, patent document CN221652171U discloses a cable suspension frame for electric locomotive charging chambers, which provides a technical solution on how to achieve safe and effective cable arrangement in charging chambers. Patent document CN116111273B discloses an explosion-proof device for underground lithium-ion battery power supply in coal mines, which provides a technical solution from the perspective of safe construction of charging chambers. However, searching the patent database makes it difficult to find a complete technical solution for underground lithium battery power supply charging chambers in coal mines that can simultaneously and effectively meet the requirements of safety and efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a coal mine lithium battery power charging chamber that is safe and reliable and can simultaneously and efficiently charge multiple coal mine underground new energy vehicles (power lithium batteries) to solve the problems existing in the prior art and meet the urgent needs of production practice.

[0005] The technical solution of this invention is as follows: The underground lithium battery power charging chamber of this invention includes a chamber roadway located in an underground coal mine, having an inlet and an outlet, and a lighting system installed on the top wall. Fire doors are installed at both the inlet and outlet of the chamber roadway. The ground surface within the chamber roadway is divided into a one-way parking and charging lane and a vehicle passage and rescue lane. Its structural features include: a cable channel and a main ventilation duct fixedly installed above the right inner wall of the chamber roadway; a sprinkler fire extinguishing system installed along the length of the chamber roadway on the right side of the top wall; three or more identical charging chamber units spaced apart along the length of the chamber roadway; and a structure located in the coal mine. The charging chamber ground monitoring platform is connected to each charging chamber unit in communication. Each charging chamber unit includes an embedded chamber that is excavated and reinforced from the right side wall of the chamber tunnel. The embedded chamber contains a charger, a monitoring substation, and an emergency backup power supply. An environmental monitoring component is installed in conjunction with the embedded chamber to monitor environmental information. An infrared thermometer is used to monitor the current temperature of the lithium battery power supply that is charging. An audible and visual alarm is used to issue an alarm signal on site. A fire-fighting component is used to extinguish fires. The chamber unit isolation cover is used to seal and isolate the charging lithium battery power supply vehicle or the entire lithium battery power supply from the outside in case of an emergency.

[0006] A further proposed solution is as follows: The aforementioned monitoring substation receives and processes the detection signals sent by the environmental monitoring components and infrared thermometers of the charging chamber unit, and controls the audible and visual alarms, fire-fighting components, and isolation covers of the charging chamber unit according to the set warning level; the ground monitoring platform of the charging chamber is remotely connected to the monitoring substation.

[0007] A further solution is as follows: The aforementioned chamber unit isolation cover includes a first cover, slide rails, a second cover, and a cover release motor; both the first and second covers are hollow structural components with openings at both ends and surrounded by a front plate, a rear plate, and two side plates. The shape of the upper opening of the first cover is adapted to the shape of the top wall of the chamber tunnel, and the distance between the two side plates of the second cover is greater than the length of a charging new energy vehicle; the first cover is fixedly installed by means of its front plate being fixedly connected to the inner wall of the chamber tunnel above the embedded chamber, and its upper opening being sealed and fixedly connected to the top wall of the chamber tunnel, and the rear plate of the first cover is located above the dividing line set between the one-way parking and charging lane and the vehicle passage and rescue lane, and a sealing ring made of fire-retardant material is fixedly installed on the inner wall around the lower end of the first cover; each slide rail is connected to the upper... Two guide rails are fixedly connected to the top wall of the tunnel and are installed opposite each other inside the first cover. A limiting support rod is fixedly installed on each side of the lower end of the two guide rails. A sliding sleeve is fixedly installed on the inner side of each of the two side plates of the second cover. The second cover can slide down from the first cover by relying on the two guide rails. A sealing ring made of fireproof and flame-retardant material is fixedly installed on the inner wall around the lower end of the second cover. One cover release motor is fixedly installed on each side of the upper end of the front plate of the first cover. The two cover release motors are used to confine the second cover inside the first cover under normal conditions. In an emergency, under the control of the monitoring substation, the second cover is rotated to release the second cover so that it slides down and seals with the one-way parking and charging lane, thereby sealing and isolating the lithium battery power vehicle or the entire lithium battery power supply that is charging from the outside.

[0008] A further solution is that the aforementioned chamber unit isolation cover also includes an infrared thermal imager fixed on each of the two slide rails below the limiting support rod, used to monitor whether there are people in the enclosed area when the chamber unit isolation cover falls.

[0009] A further solution is to provide an emergency manual escape door on the rear panel of the second enclosure of the aforementioned chamber unit isolation cover, which is used for personnel accidentally trapped inside the chamber unit isolation cover to escape towards the vehicle access and rescue lane.

[0010] A further proposed solution is as follows: the aforementioned infrared thermometer is installed on the wall of the chamber passageway on one side of the entrance of the embedded chamber; the audible and visual alarm is installed on the wall of the chamber passageway above the entrance of the embedded chamber; under the control of the monitoring substation, the audible and visual alarm issues corresponding audible and visual alarm information according to different levels of alarm.

[0011] A further solution is as follows: Above the aforementioned embedded chamber, there is a ventilation branch pipe that connects the embedded chamber to the main ventilation duct, and there is a bundled cable with explosion-proof and flame-retardant wiring through a cable channel; the aforementioned charger is connected to the power supply in the coal mine through the bundled cable, and the monitoring substation is connected to the ground monitoring platform of the charging chamber through the bundled cable.

[0012] A further proposed solution is as follows: The aforementioned environmental monitoring components include a methane sensor (for detecting methane concentration), a hydrogen sensor (for detecting hydrogen concentration), a carbon monoxide sensor (for detecting carbon monoxide concentration), a smoke sensor (for detecting smoke concentration), a flame sensor (for detecting the presence of flames), a temperature sensor (for detecting ambient temperature), a carbon dioxide sensor (for detecting carbon dioxide concentration), an oxygen sensor (for detecting oxygen concentration), and a camera that acquires real-time image information of the charging chamber unit. Specifically, the methane sensor, hydrogen sensor, carbon monoxide sensor, smoke sensor, flame sensor, and temperature sensor are suspended on the top wall of the chamber passageway above the one-way parking and charging lane on the front of the embedded chamber. The carbon dioxide sensor and oxygen sensor are located on the inner wall of the embedded chamber and at the air outlet of the ventilation branch pipe. The camera is located on the wall of the chamber passageway above the entrance to the embedded chamber.

[0013] A further proposed solution is as follows: The aforementioned fire-fighting components include a fire-fighting toolbox, automatic sprinkler heads, manual sprinkler heads, a backfire control valve, oxygen masks, and automatic fire doors for the chamber. The fire-fighting toolbox is located within an embedded chamber and contains fire extinguishers and sandbags for manual fire suppression. Both the automatic and manual sprinkler heads are connected to the sprinkler fire suppression system of the chamber's roadway and are positioned above the one-way parking and charging lane on the front side of the embedded chamber. The automatic sprinkler heads are controlled by a monitoring substation. The backfire control valve is located on the ventilation branch pipe and is electrically connected to and controlled by the monitoring substation. The oxygen masks are located in a dedicated toolbox in the center of the monitoring substation. The automatic fire doors for the chamber are located above the entrance to the embedded chamber, and their opening and closing are controlled by the monitoring substation.

[0014] Further options include: the aforementioned sprinkler fire extinguishing system is a sprinkler fire extinguishing system that sprays a lithium battery-specific fire extinguishing agent upon startup.

[0015] This invention has positive effects: Through innovative design of the overall structure, it provides a practical technical solution that effectively solves the problem of how to achieve safe and efficient charging of numerous lithium battery-powered vehicles and rotating lithium battery power supplies in coal mines. Under the premise of ensuring safety, it can efficiently charge multiple sets of lithium battery power supplies simultaneously, resolving the irreconcilable contradiction between safety and efficiency in lithium battery power supply charging in existing technologies. Furthermore, the technical solution of this invention is easy to implement, relatively inexpensive, and suitable for widespread promotion in coal mining enterprises. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the underground lithium battery power supply charging chamber in a coal mine, as viewed from the outlet.

[0017] Figure 2 This is a simplified overall structural diagram of the present invention with relevant components omitted;

[0018] Figure 3 This is a schematic diagram of the overall structure of a charging chamber unit of the present invention;

[0019] Figure 4 for Figure 3 A schematic diagram of the overall structure of an embedded chamber;

[0020] Figure 5 for Figure 3 A schematic diagram of a structure of a safety isolation enclosure;

[0021] Figure 6 for Figure 5 The diagram shown illustrates the structure of the safety isolation enclosure in emergency use.

[0022] Figure 7 This is a schematic diagram of the circuit structure of a charging chamber unit of the present invention.

[0023] The reference numerals in the above figures are as follows:

[0024] 1. Ductway 1, Exit 11, Fire door 12, One-way parking and charging lane 13, Vehicle passage and rescue lane 14; Cable channel 15; Main ventilation duct 16; Explosion-proof lighting assembly 17; Sprinkler fire extinguishing system 18;

[0025] Charging chamber unit 2, embedded chamber 21, ventilation branch pipe 21-1, bundled cable 21-2; charger 22, monitoring substation 23, emergency backup power supply 24, environmental monitoring components 25, methane sensor 25-1, hydrogen sensor 25-2, carbon monoxide sensor 25-3, smoke sensor 25-4, flame sensor 25-5, temperature sensor 25-6, carbon dioxide sensor 25-7, oxygen sensor 25-8, camera 25-9; infrared thermometer 26; acoustic and optical sensors. Alarm 27; Firefighting components 28, Firefighting toolbox 28-1, Automatic sprinkler head 28-2, Manual sprinkler head 28-3, Backfire control valve 28-4, Oxygen mask 28-5, Automatic fireproof door for chamber 28-6; Chamber unit isolation cover 29, First cover 29-1, Slide rail 29-2, Limiting support rod 29-2-1, Second cover 29-3, Sliding sleeve 29-3-1, Emergency manual escape door 29-3-2, Cover release motor 29-4, Infrared thermal imager 29-5;

[0026] 3. Ground monitoring platform for charging chamber. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] See Figures 1 to 7 The underground lithium battery power charging chamber in this embodiment mainly consists of a chamber roadway 1 located underground in the coal mine, multiple (more than 3) charging chamber units 2 with the same structure located on the right side of the chamber roadway 1 from the inlet to the outlet 11, and a charging chamber ground monitoring platform 3 located on the surface of the coal mine.

[0029] The tunnel 1 itself is different from existing technologies, such as Figure 1The tunnel shown is either a tunnel with an arched dome or a tunnel with a flat roof. The tunnel 1 has an entrance (not marked in the figure) and an exit 11. Both the entrance and exit 11 are equipped with fire doors 12 that comply with coal mine safety regulations and can be manually closed on-site or automatically closed remotely by the charging tunnel ground monitoring platform 3. The ground inside the tunnel 1 is divided into a one-way parking and charging lane 13 and a vehicle passage and rescue lane 14. The inner wall of the tunnel 1, located on the upper right side in the direction from the entrance to the exit 11, is fixedly equipped with a cable channel 15 and a main ventilation duct 16 that runs through the tunnel 1. The top of the tunnel 1 is equipped with two rows of explosion-proof lighting lamps 17 along the length of the tunnel 1. The top right side of the tunnel 1 is equipped with a spray fire extinguishing system 18 for spraying lithium battery-specific fire extinguishing agent in case of fire. This embodiment differs from the fire extinguishing agents commonly used in existing technologies. Instead, it employs a lithium battery-specific fire extinguishing agent. This lithium battery-specific fire extinguishing agent contains special fire extinguishing additives that can accelerate cell aging, degrade internal battery materials, prevent internal reactions and reignition, and provide rapid fire extinguishing and adsorption of toxic gases through water foaming. Compared to water, its lower surface tension allows it to enter the battery more easily, and its rapid vaporization speed enables the full release of internal battery energy and continuous cooling.

[0030] Each charging chamber unit 2 includes an embedded chamber 21, a charger 22, a monitoring substation 23, an emergency backup power supply 24, an environmental monitoring component 25, an infrared thermometer 26, an audible and visual alarm 27, a fire-fighting component 28, and a chamber unit isolation cover 29.

[0031] An embedded chamber 21 is located in the lower middle part of the right inner wall of the tunnel 1 in the direction from the tunnel entrance to the exit 11. The embedded chamber is a structure formed by excavating inward along the width of the tunnel 1 from the right inner wall and reinforcing the excavated space. Above the embedded chamber 21 is a ventilation branch pipe 21-1 connecting the interior of the embedded chamber 21 to the main ventilation duct 16, and a bundled cable 21-2 with explosion-proof and flame-retardant wiring running through the cable channel 15. By setting the embedded chamber 21, this embodiment significantly reduces the overall width of the tunnel 1 compared to existing technologies, lowering the construction cost of the tunnel 1. Furthermore, it aligns with the overall technical solution of this embodiment, facilitating the rational installation and layout of relevant monitoring and security facilities.

[0032] The charger 22 is housed within the embedded chamber 21. The charger 22 employs an existing explosion-proof charger, such as the multi-gun explosion-proof intelligent charging device for new energy vehicles disclosed in authorization announcement number CN108973736B. During charging, the charger 22 can interact with the lithium battery power supply installed on the new energy vehicle or a specially transported lithium battery power supply to obtain parameters such as the current charge level, current temperature, current charging voltage, and charging current of the lithium battery power supply. The charger 22 is externally connected to a general-purpose AC1140V or AC660V power supply in a coal mine via a bundled cable 21-2.

[0033] The monitoring substation 23 is located within the embedded chamber 21. As the main control center of the charging chamber unit 2, the monitoring substation 23 receives and processes detection signals from various detection devices, including the environmental monitoring component 25 and the infrared thermometer 26 of the charging chamber unit 2. Based on the set warning levels, it controls the operation of the audible and visual alarm 27, the fire-fighting component 28, and the isolation cover 29 of the charging chamber unit 2. The monitoring substation 23 also communicates remotely with the ground monitoring platform 3 of the charging chamber to exchange information. It should be noted that the circuit structure and working principle of the monitoring substation 23 are existing technologies and will not be described in detail. A dedicated toolbox is located in the middle of the monitoring substation 23, and a backup power supply installation box is located at the bottom of the monitoring substation 23.

[0034] Emergency backup power supply 24 is used to provide operating power when the external power supply to charging chamber unit 2 fails. Emergency backup power supply 24 is located in the backup power supply installation box at the bottom of monitoring substation 23. The power supply capacity of the backup power supply must meet the requirements of the entire fire duration; typically, a backup power supply capable of continuously providing emergency power for 4 hours is used. Emergency backup power supply 24 is a commercially available component.

[0035] The environmental monitoring component 25 is used to monitor the environmental information of the area where the charging chamber unit 2 is located. The environmental monitoring component 25 includes a methane sensor 25-1 for detecting the methane concentration in the area where the charging chamber unit 2 is located, a hydrogen sensor 25-2 for detecting the hydrogen concentration, a carbon monoxide sensor 25-3 for detecting the carbon monoxide concentration, a smoke sensor 25-4 for detecting the smoke concentration, a flame sensor 25-5 for detecting whether a flame is present, a temperature sensor 25-6 for detecting the ambient temperature, a carbon dioxide sensor 25-7 for detecting the carbon dioxide concentration, an oxygen sensor 25-8 for detecting the oxygen concentration, and a camera 25-9 for acquiring real-time image information of the charging chamber unit 2. The methane sensor 25-1, hydrogen sensor 25-2, carbon monoxide sensor 25-3, smoke sensor 25-4, flame sensor 25-5, and temperature sensor 25-6 are suspended on the top wall of the chamber tunnel 1 above the one-way parking and charging lane 13 facing the embedded chamber 21; the carbon dioxide sensor 25-7 and oxygen sensor 25-8 are located on the inner wall of the embedded chamber 21 at the air outlet of the ventilation branch pipe 21-1; and the camera 25-9 is located on the wall of the chamber tunnel 1 above the entrance of the embedded chamber 21. All components of the environmental monitoring component 25 are electrically connected to the monitoring substation 23 and transmit the detection information to the monitoring substation. All components of the environmental monitoring component 25 are commercially available parts.

[0036] Infrared thermometer 26 is installed on the wall of the tunnel 1 on one side of the entrance to the embedded chamber 21. Infrared thermometer 26 is used to detect the current temperature of the lithium battery power supply during charging in real time, forming a double safety net with the lithium battery power supply obtained by the charger 22. Infrared thermometer 26 is electrically connected to the monitoring substation 23 and sends the detection information to the monitoring substation. Infrared thermometer 26 is a commercially available component.

[0037] The audible and visual alarm 27 is installed on the wall of the tunnel 1 above the entrance of the embedded chamber 21; the audible and visual alarm 27 is used to emit audible and visual alarm signals, and is electrically connected to the monitoring substation 23. The audible and visual alarm 27 is a commercially available component.

[0038] The fire-fighting component 28 includes a fire-fighting toolbox 28-1, automatic sprinkler heads 28-2, manual sprinkler heads 28-3, a backfire control valve 28-4, an oxygen mask 28-5, and an automatic fire door 28-6 for the chamber. The fire-fighting toolbox 28-1 is located inside the embedded chamber 21 and contains manual fire extinguishers and sandbags. Both the automatic sprinkler heads 28-2 and the manual sprinkler heads 28-3 are connected to the sprinkler fire suppression system 18 of the chamber's roadway 1 and are located above the one-way parking and charging lane 13 on the front of the embedded chamber 21. The automatic sprinkler heads 28-2 are electrically connected to the monitoring substation 23 and are automatically activated by the monitoring substation 23. The manual sprinkler heads 28-3 are manually activated when needed, with dual backups to ensure reliability. Control valve 28-4 is located on ventilation branch pipe 21-1 and electrically connected to monitoring substation 23. When the emergency mode of this charging chamber unit 2 is activated, the monitoring substation 23 controls the ventilation branch pipe 21-1 to close, preventing flames and smoke from spreading to other charging chamber units 2 via the ventilation branch pipe 21-1 and main ventilation pipe 16. Oxygen masks 28-5 are located in a dedicated toolbox in the middle of monitoring substation 23 and are worn by on-site personnel in charging chamber unit 2 during emergency escape. Automatic fireproof door 28-6 is located above the entrance to the embedded chamber 21. Under set conditions, the automatic fireproof door 28-6 is automatically closed by monitoring substation 23 to isolate the equipment inside the embedded chamber 21 from the fire source. The automatic fireproof door 28-6 is a commercially available explosion-proof electric roller shutter door.

[0039] The chamber unit isolation cover 29 is used to completely enclose a new energy vehicle or a disassembled lithium battery power source that catches fire while charging in this charging chamber unit 2, sealing it off from the outside environment. On the one hand, the lack of oxygen inside the chamber unit isolation cover 29 quickly reduces the fire and effectively prevents the fire from spreading to other charging chamber units 2. On the other hand, it prevents toxic and harmful smoke and gases from spreading within the chamber tunnel 1, causing casualties. Please refer to [link / reference]. Figure 5 and Figure 6 As a specific implementation, the chamber unit isolation cover 29 in this embodiment includes a first cover 29-1, a slide rail 29-2, a second cover 29-3, a cover release motor 29-4, and an infrared thermal imager 29-5. The first cover 29-1 is a hollow structural component with openings at both the top and bottom and surrounded by a front plate, a rear plate, and two side plates. The shape of the upper end of the first cover 29-1 is adapted to the shape of the top of the chamber roadway 1, such as... Figure 5As shown, to adapt to the arched dome of the tunnel 1, the height of the rear plate of the first cover 29-1 is greater than the height of the front plate, and the upper ends of the two side plates are arc-shaped; the distance between the two side plates is greater than the length of a charging new energy vehicle. Obviously, if the top of the tunnel 1 is flat, then the upper end of the first cover 29-1 is set as a flat opening. The first cover 29-1 is fixedly connected to the inner wall of the chamber passage 1 above the entrance of the embedded chamber 21 with its front plate, and the upper port of the first cover 29-1 is sealed and fixedly connected to the top wall of the chamber passage 1. The rear plate of the first cover 29-1 is located above the dividing line between the one-way parking and charging lane 13 and the vehicle passage and rescue lane 14. A sealing ring made of fireproof and flame-retardant material (not shown or labeled in the figure) is fixedly provided on the inner wall around the lower end of the first cover 29-1. Each slide rail 29-2 is fixedly connected to the top wall of the chamber passage 1 with its upper end. Two slide rails are arranged opposite each other inside the first cover 29-1. A limiting support rod 29-2-1 is fixedly provided on the opposite side of the lower end of each of the two slide rails 29-2. A setting for the use of limiting support rod 29-2-1 is fixedly provided on the lower side of each slide rail 29-2. An infrared thermal imager 29-5 monitors whether there are personnel in the enclosed area when the isolation cover 29 of the chamber unit is lowered. The second cover 29-3 is a hollow, rectangular structure consisting of a front panel, a rear panel, and two side panels. The distance between the two side panels of the second cover 29-3 is greater than the length of a charging new energy vehicle. Each of the two side panels of the second cover 29-3 is fixedly equipped with a sliding sleeve 29-3-1 that slides and engages with a slide rail 29-2, allowing the second cover 29-3 to slide down along the two slide rails 29-2. A sealing ring made of fire-retardant material (not shown or labeled in the figure) is fixedly installed on the inner wall around the lower end of the second cover 29-3 to achieve a sealed connection between the lower end of the second cover 29-3 and the one-way parking and charging lane 13 after the second cover 29-3 slides down. As a preferred embodiment, the rear panel of the second cover 29-3 is equipped with an emergency manual escape door 29-3-2 for personnel who are accidentally trapped inside the isolation cover 29 of the chamber unit to escape. One of each of the two cover release motors 29-4 is fixedly installed on both sides of the upper end of the front plate of the first cover 29-1. Under normal circumstances, the two cover release motors 29-4 confine the second cover 29-3 within the first cover 29-1. In an emergency, under the control of the monitoring substation 23, the two cover release motors 29-4 rotate to release the second cover 29-3, which slides downwards and seals against the one-way parking and charging lane 13. This achieves the goal of completely enclosing the new energy vehicle charging in the charging chamber unit 2 or the unloaded lithium battery power supply, isolating it from the outside world. Obviously, the chamber unit isolation cover 29 is not limited to the aforementioned structure. Structures employing the same method, such as a three-layer nested automatic falling structure or other structures capable of completely enclosing a burning new energy vehicle or an unloaded lithium battery power supply, is also within the scope of protection of this invention.

[0040] The ground monitoring platform 3 of the charging chamber is connected to the monitoring substation 23 of each charging chamber unit 2. The ground monitoring platform 3 displays the information uploaded by the monitoring substation 23 of each charging chamber unit 2 in real time so that the ground monitoring staff can grasp the real-time status of each charging chamber unit 2. At the same time, the ground monitoring platform 3 can remotely send action control commands to the monitoring substation 23 of each charging chamber unit 2 to realize remote control of each charging chamber unit 2, including stopping charging, power off, fire extinguishing activation, etc.

[0041] The ground monitoring platform 3 for the charging chamber and the monitoring substations 23 of each charging chamber unit 2 are all equipped with the same hierarchical alarm processing thresholds, as follows:

[0042] Level 1 warning: When the real-time temperature of the lithium battery power supply installed on the new energy vehicle being charged or the lithium battery power supply being charged independently reaches the set threshold (such as 55℃), the monitoring substation 23 controls the audible and visual alarm 27 to issue a Level 1 audible and visual alarm signal.

[0043] Level 2 Alarm: When any of the following conditions are met: methane concentration reaches 0.5%, carbon monoxide concentration reaches 0.0024%, hydrogen concentration reaches 0.5%, ambient temperature reaches the Level 2 alarm threshold (e.g., 34 ℃), or lithium battery power supply temperature reaches the Level 2 alarm threshold (e.g., 60 ℃), monitoring substation 23 controls audible and visual alarm 27 to issue a Level 2 audible and visual alarm signal; monitoring substation 23 and charging chamber ground monitoring platform 3 simultaneously display Level 2 alarm pop-up information, monitoring substation 23 cuts off external power supply, charger 22 stops charging; emergency backup power supply 24 activates emergency power supply.

[0044] Level 3 Emergency Response: When the ambient temperature reaches the Level 3 emergency response threshold (e.g., 54℃), the concentrations of methane, carbon monoxide, hydrogen, and smoke reach the Level 3 emergency response threshold, or a flame is detected, monitoring substation 23 controls audible and visual alarm 27 to issue an emergency audible and visual alarm signal (voice such as "Fire extinguishing activated, please be aware"). Simultaneously, monitoring substation 23 and the ground monitoring platform 3 of the charging chamber display a level 3 emergency information pop-up window. Monitoring substation 23 cuts off the external power supply, and charger 22 stops charging. Emergency backup power supply 24 turns on to provide emergency power. Monitoring substation 23 of this charging chamber unit 2 simultaneously controls the automatic sprinkler head 28-2 to start spraying lithium battery-specific fire extinguishing agent for fire extinguishing. Backfire control valve 28-4 closes and cuts off the ventilation between the ventilation branch pipe 21-1 of the embedded chamber 21 and the main ventilation pipe 16. The automatic fireproof door 28-6 of the chamber closes the embedded chamber 21. The cover release motor 29-4 of the chamber unit isolation cover 29 is activated to completely cover the new energy vehicle or the lithium battery power supply that has been unloaded from charging, making it sealed and isolated from the outside. All of the above actions can be remotely controlled by the charging chamber ground monitoring platform 3. Under certain conditions, the charging chamber ground monitoring platform 3 can remotely control the closure of the fire doors 12 at the entrance and exit 11 of the roadway to prevent threats to other parts of the coal mine.

[0045] As can be seen from the foregoing, the underground lithium battery power supply charging chamber of this embodiment provides a practical and feasible technical solution to the problem of how to achieve safe and efficient charging of numerous lithium battery power supplies in underground coal mines in the prior art. It can efficiently charge multiple sets of lithium battery power supplies at the same time while ensuring safety, and solves the contradiction between safety and efficiency in lithium battery power supply charging in the prior art. Moreover, the technical solution of this embodiment is easy to implement, relatively inexpensive, and suitable for widespread promotion in coal mining enterprises.

[0046] The above embodiments are descriptions of specific implementations of the present invention, and not limitations thereof. Those skilled in the art can make various modifications and changes without departing from the spirit and scope of the present invention to obtain corresponding equivalent technical solutions. Therefore, all equivalent technical solutions should be included in the patent protection scope of the present invention.

Claims

1. A lithium battery power charging chamber for underground coal mines, comprising a chamber roadway located underground in a coal mine with an inlet and an outlet, and lighting fixtures installed on the roof wall; fire doors are provided at both the inlet and outlet of the chamber roadway; the ground surface within the chamber roadway is divided into a one-way parking and charging lane and a vehicle passage and rescue lane; characterized in that: It also includes a cable channel and main ventilation duct fixedly installed on the upper right side of the inner wall of the tunnel; a sprinkler fire extinguishing system installed on the right side of the top wall of the tunnel along the length of the tunnel; three or more identical charging tunnel units spaced apart along the length of the tunnel; and a charging tunnel ground monitoring platform installed on the coal mine surface and communicating with each charging tunnel unit; each charging tunnel unit includes an embedded chamber excavated and reinforced from the right side wall of the tunnel, a charger, a monitoring substation and an emergency backup power supply installed in the embedded chamber, an environmental monitoring component for monitoring environmental information installed in conjunction with the embedded chamber, an infrared thermometer for monitoring the current temperature of the lithium battery power supply that is charging, an audible and visual alarm for issuing alarm signals on site, fire extinguishing components, and a tunnel unit isolation cover for sealing and isolating the charging lithium battery power supply vehicle or the entire lithium battery power supply that is in danger from the outside. The chamber unit isolation cover includes a first cover, slide rails, a second cover, and a cover release motor. Both the first and second covers are hollow structures with openings at both ends and surrounded by a front plate, a rear plate, and two side plates. The shape of the upper opening of the first cover is adapted to the shape of the top wall of the chamber tunnel. The distance between the two side plates of the second cover is greater than the length of a charging new energy vehicle. The first cover is fixedly installed with its front plate fixedly connected to the inner wall of the chamber tunnel above the embedded chamber, and its upper opening sealed and fixedly connected to the top wall of the chamber tunnel. The rear plate of the first cover is located above the dividing line between the one-way parking / charging lane and the vehicle passage / rescue lane. A sealing ring made of fire-retardant material is fixedly installed on the inner wall around the lower end of the first cover. Each slide rail is connected to the chamber from its upper end. The top wall of the tunnel is fixedly connected to two oppositely arranged rails inside the first enclosure. A limiting support rod is fixedly installed on each side of the lower end of the two rails. A sliding sleeve is fixedly installed on the inner side of each of the two side plates of the second enclosure. The second enclosure slides down from the first enclosure by sliding with the rails. A sealing ring made of fireproof and flame-retardant material is fixedly installed on the inner wall around the lower end of the second enclosure. One enclosure release motor is fixedly installed on each side of the upper end of the front plate of the first enclosure. The two enclosure release motors are used to confine the second enclosure inside the first enclosure under normal conditions. In an emergency, under the control of the monitoring substation, they rotate to release the second enclosure so that it slides down and seals with the one-way parking and charging lane, thereby sealing and isolating the charging lithium battery power vehicle or the entire lithium battery power source from the outside.

2. The underground lithium battery power supply charging chamber in a coal mine according to claim 1, characterized in that: The monitoring substation receives and processes the detection signals sent by the environmental monitoring components and infrared thermometers of the charging chamber unit, and controls the audible and visual alarms, fire-fighting components, and isolation cover of the charging chamber unit according to the set warning level; the ground monitoring platform of the charging chamber is remotely connected to the monitoring substation.

3. The underground lithium battery power supply charging chamber in a coal mine according to claim 1, characterized in that: The chamber unit isolation cover also includes an infrared thermal imager fixed on each of the two slide rails below the limiting support rod, for monitoring whether there are people in the enclosed area when the chamber unit isolation cover falls.

4. The underground lithium battery power supply charging chamber in a coal mine according to claim 1, characterized in that: The rear panel of the second enclosure of the chamber unit isolation cover is equipped with an emergency manual escape door for personnel accidentally trapped inside the chamber unit isolation cover to escape towards the vehicle access and rescue lane.

5. The underground lithium battery power supply charging chamber in a coal mine according to claim 1, characterized in that: The infrared thermometer is installed on the wall of the chamber passageway on one side of the doorway of the embedded chamber; the audible and visual alarm is installed on the wall of the chamber passageway above the doorway of the embedded chamber; under the control of the monitoring substation, the audible and visual alarm emits corresponding audible and visual alarm information according to different levels of alarm.

6. The underground lithium battery power supply charging chamber in a coal mine according to claim 1, characterized in that: Above the embedded chamber is a ventilation branch pipe that connects the embedded chamber to the main ventilation duct, and a bundled cable with explosion-proof and flame-retardant wiring through a cable channel; the charger is connected to the power supply in the coal mine through the bundled cable, and the monitoring substation is connected to the ground monitoring platform of the charging chamber through the bundled cable.

7. The underground lithium battery power supply charging chamber in a coal mine according to claim 6, characterized in that: The environmental monitoring components include a methane sensor (for detecting methane concentration), a hydrogen sensor (for detecting hydrogen concentration), a carbon monoxide sensor (for detecting carbon monoxide concentration), a smoke sensor (for detecting smoke concentration), a flame sensor (for detecting the presence of flames), a temperature sensor (for detecting ambient temperature), a carbon dioxide sensor (for detecting carbon dioxide concentration), an oxygen sensor (for detecting oxygen concentration), and a camera for acquiring real-time image information of the charging chamber unit, all electrically connected to the monitoring substation and transmitting detection information to the monitoring substation; wherein, the methane sensor, hydrogen sensor, carbon monoxide sensor, smoke sensor, flame sensor, and temperature sensor are suspended on the top wall of the chamber aisle above the one-way parking and charging lane in front of the embedded chamber; the carbon dioxide sensor and oxygen sensor are located on the inner wall of the embedded chamber and at the air outlet of the ventilation branch pipe; the camera is located on the wall of the chamber aisle above the entrance of the embedded chamber.

8. The underground lithium battery power supply charging chamber in a coal mine according to claim 6, characterized in that: The fire-fighting components include a fire-fighting toolbox, automatic sprinkler heads, manual sprinkler heads, a backfire control valve, oxygen masks, and automatic fire doors for the chamber. The fire-fighting toolbox is located inside the embedded chamber and contains fire extinguishers and sandbags for manual fire suppression. Both the automatic and manual sprinkler heads are connected to the sprinkler fire suppression system of the chamber's roadway and are located above the one-way parking and charging lane on the front of the embedded chamber. The automatic sprinkler heads are controlled by a monitoring substation. The backfire control valve is located on the ventilation branch pipe and is electrically connected to and controlled by the monitoring substation. The oxygen masks are located in a dedicated toolbox located in the middle of the monitoring substation. The automatic fire doors for the chamber are located above the entrance to the embedded chamber and their opening and closing are controlled by the monitoring substation.

9. The underground lithium battery power supply charging chamber in a coal mine according to claim 1, characterized in that: The sprinkler fire extinguishing system is a sprinkler fire extinguishing system that sprays a lithium battery-specific fire extinguishing agent when activated.

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