Novel filling type circulating cooling fire extinguishing system for lithium battery module

Abstract

The invention relates to the technical field of battery cooling and fire extinguishing, and discloses a novel filling type circulating cooling and fire extinguishing system for a lithium battery module. The battery module is arranged in an inner cavity of a battery placement bin in an inverted mode, and a first filling mechanism and a first backflow mechanism are arranged on one side of the battery module; the second filling mechanism and the second backflow mechanism are positioned on the other side of the battery module; a liquid storage tank and a high-pressure nitrogen tank which are communicated with each other are arranged in an inner cavity of the bottle group placing bin, a phase-change material is arranged in the liquid storage tank, the liquid storage tank is communicated with a bottle group circulating pipeline I and a bottle group circulating pipeline II, and the bottle group circulating pipeline I is communicated with a first filling mechanism and a first backflow mechanism; the bottle group circulating pipeline II is communicated with the second filling mechanism and the second backflow mechanism; and the valve group mechanism is used for controlling the flowing direction of a fire extinguishing agent in the bottle group circulating pipeline I and the bottle group circulating pipeline II. The high-temperature position of the battery module can be accurately cooled, and an efficient fire extinguishing measure of circulating cooling is formed.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cooling and fire extinguishing, and in particular to a novel perfusion-type circulating cooling and fire extinguishing system for a lithium battery module. Background Art

[0002] With the widespread use of lithium batteries in energy storage power stations and electric vehicles, the fire hazard caused by their thermal runaway has become a common safety challenge in both areas. The intensive operation of battery packs in energy storage power stations can easily trigger cascading thermal runaway; in electric vehicles, short circuits in battery cells under extreme operating conditions can instantly release large amounts of heat energy, leading to explosions. Both scenarios present problems such as rapid fire spread, difficulty in internal fire extinguishing, and a high risk of re-ignition. Traditional fire-fighting technologies have significant limitations: gas fire extinguishing has difficulty penetrating the interior of the battery to suppress thermal reactions; water-based sprays are prone to conductive corrosion of equipment and lack continuous cooling; and new fire-extinguishing agents face bottlenecks such as high costs or demanding application conditions. In addition, existing solutions are mostly designed for upright batteries and do not fully utilize the thermal management advantages of an inverted layout. Inverted installation of energy storage power stations allows for centralized heat dissipation, while the inverted design of electric vehicles facilitates coverage of key electrode locations with fire-extinguishing agents. However, these characteristics have not yet been effectively integrated.

[0003] Current fire-fighting systems urgently need breakthroughs in accuracy and adaptability. Energy storage power plants must address the independent prevention and control of large-scale battery packs and their rapid repair. Electric vehicles, on the other hand, require lightweight, fast-response systems that can withstand complex operating conditions. Existing technologies struggle to achieve both efficient fire suppression and continuous cooling, and they lack the flexibility to adapt across multiple scenarios. Summary of the Invention

[0004] The purpose of the present invention is to provide a new type of perfusion circulating cooling fire extinguishing system for lithium battery modules, aiming to solve or improve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a new type of perfusion circulating cooling fire extinguishing system for lithium battery modules, comprising:

[0006] A battery placement compartment, wherein a battery module is arranged in an inverted manner in its inner cavity, and a first perfusion mechanism, a first reflux mechanism, a second perfusion mechanism, and a second reflux mechanism are provided on the side wall of the battery placement compartment, wherein the first perfusion mechanism and the first reflux mechanism are provided on one side of the battery module, and the second perfusion mechanism and the second reflux mechanism are provided on the other side of the battery module;

[0007] A bottle group placement warehouse, the inner cavity of which is provided with a connected liquid storage tank and a high-pressure nitrogen tank, the liquid storage tank is provided with a phase change material, the liquid storage tank is connected to a bottle group circulation pipeline I and a bottle group circulation pipeline II, the bottle group circulation pipeline I is connected to the first perfusion mechanism and the first reflux mechanism, and the bottle group circulation pipeline II is connected to the second perfusion mechanism and the second reflux mechanism;

[0008] The valve group mechanism is used to control the flow direction of the fire extinguishing agent in the bottle group circulation pipeline I and the bottle group circulation pipeline II.

[0009] Optionally, a connected miniature bidirectional pump and a miniature liquid cooling device are provided on the top of the bottle group placement bin, and the bottle group circulation pipeline I and the bottle group circulation pipeline II are connected to the miniature liquid cooling device through the pump group circulation pipeline I and the pump group circulation pipeline II respectively.

[0010] Optionally, a trapezoidal liquid collecting trough is provided at the bottom of the battery placement compartment, a self-priming filter pump is provided at the bottom of the trapezoidal liquid collecting trough, and the self-priming filter pump is connected to the liquid storage tank through a reflux pipeline III.

[0011] Optionally, a quick-release battery holder is provided in the battery compartment, and the quick-release battery holder is detachably connected to the battery module via a plurality of holder clips.

[0012] Optionally, a fan is provided on the side wall of the bottle group storage bin.

[0013] Optionally, the liquid storage tank is connected to a liquid infusion pipeline.

[0014] Optionally, the high-pressure nitrogen tank is connected to a gas supply pipeline.

[0015] Optionally, the high-pressure nitrogen tank and the liquid storage tank are connected via a pressure reducing valve, a high-pressure hose and a one-way solenoid valve.

[0016] Optionally, an infrared temperature sensor is provided on the top of the battery storage compartment.

[0017] Optionally, a BMS early warning system is provided in the battery module.

[0018] The present invention discloses the following technical effects:

[0019] 1. The inverted installation of the battery module enhances heat dissipation efficiency, making it easier for the fire extinguishing agent to cover key leakage points. The valve group mechanism controls the flow direction of the fire extinguishing agent in the bottle group circulation pipeline I and the bottle group circulation pipeline II, which can accurately cool the high-temperature parts of the battery module and form a circulating cooling and efficient fire extinguishing measure.

[0020] 2. The present invention forms a temperature field characterization model through temperature detection by BMS and infrared temperature sensors, dynamically adjusts the fire extinguishing mode according to the battery temperature distribution, and realizes closed-loop management of the entire process of "early warning-precise fire extinguishing-continuous cooling", significantly reducing the risk of re-ignition.

[0021] 3. The present invention dynamically switches the circulation loop according to the temperature distribution, accurately controls the flow direction and flow rate of the fire extinguishing agent, avoids accidental contact with the normal module, and automatically switches the micro bidirectional pump 13 circulation as the nitrogen pressure drops, thereby improving the fire extinguishing cooling efficiency.

[0022] 4. The filter is combined with a trapezoidal liquid collection tank and a self-priming filter pump to achieve rapid recovery and purification of fire extinguishing agents, thereby improving resource utilization.

[0023] 5. The invention's graded pressure regulation (0.5-10MPa) and lightweight design are suitable for intensive control of energy storage power stations and complex operating conditions of electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the overall structure of the present invention from another perspective;

[0027] Figure 3 This is a schematic diagram of the structure of the bottle group placement bin of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the battery storage compartment of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the trapezoidal liquid collecting tank at the bottom of the battery storage compartment of the present invention;

[0030] Figure 6 It is a flowchart of the fire extinguishing and cooling process steps of the present invention.

[0031] Figure 1: Battery compartment; 2: Bottle group compartment; 3: Bottle group circulation line I; 4: Bottle group circulation line II; 5: Electric two-way valve; 6: Filling line I; 7: Pulse valve I; 8: Return line II; 9: Electric one-way valve; 10: Filter; 11: Electric return valve II; 12: Pump group circulation line I; 13: Micro two-way pump; 14: Micro liquid cooling device; 15: Fan; 16: Filling line II; 17: Pulse valve II; 18: Return line I; 19: Electric return valve Ⅰ; 20. Pump group circulation pipeline Ⅱ; 21. Exhaust port; 22. Liquid storage tank; 23. High-pressure nitrogen tank; 24. Bottle group bracket; 25. Pressure reducing valve; 26. High-pressure hose; 27. One-way solenoid valve; 28. Return pipeline Ⅲ; 29. ​​Air supply pipeline; 30. Liquid supply pipeline; 31. Battery module; 32. Quick-release battery bracket; 33. Bracket buckle; 34. Intelligent sensor nozzle; 35. Filter; 36. Infrared temperature sensor; 37. Trapezoidal liquid collection tank; 38. Self-priming filter pump. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making creative efforts are within the scope of protection of the present invention.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Reference Figures 1-6 The present invention provides a new type of perfusion circulating cooling fire extinguishing system for lithium battery modules, comprising:

[0035] The battery compartment 1 has an inverted inner cavity with a battery module 31. The side walls of the battery compartment 1 are provided with a first filling mechanism, a first reflux mechanism, a second filling mechanism, and a second reflux mechanism. The first filling mechanism and the first reflux mechanism are provided on one side of the battery module 31, and the second filling mechanism and the second reflux mechanism are provided on the other side of the battery module 31.

[0036] The bottle group placement warehouse 2 has an inner cavity provided with a liquid storage tank 22 and a high-pressure nitrogen tank 23 connected to each other. The liquid storage tank 22 is provided with a phase change material. The liquid storage tank 22 is connected to a bottle group circulation pipeline I3 and a bottle group circulation pipeline II4. The bottle group circulation pipeline I3 is connected to the first perfusion mechanism and the first reflux mechanism, and the bottle group circulation pipeline II4 is connected to the second perfusion mechanism and the second reflux mechanism.

[0037] The valve group mechanism is used to control the flow direction of the fire extinguishing agent in the bottle group circulation pipeline I3 and the bottle group circulation pipeline II4.

[0038] The flow direction of the fire extinguishing agent in the bottle group circulation pipeline I3 and the bottle group circulation pipeline II4 is controlled by the valve group mechanism. When the battery module 31 generates high temperature on the side close to the first perfusion mechanism, the first perfusion mechanism continuously sprays the fire extinguishing agent in the liquid storage tank 22 to the high-temperature side of the battery module 31 through the bottle group circulation pipeline I3 for cooling. When the fire extinguishing agent liquid level reaches the second reflux mechanism on the other side, the fire extinguishing agent is returned to the liquid storage tank 22 from the bottle group circulation pipeline II4 through the second reflux mechanism. Conversely, when the battery module 31 generates high temperature on the side close to the second perfusion mechanism, the second perfusion mechanism continuously sprays the fire extinguishing agent in the liquid storage tank 22 to the high-temperature side of the battery module 31 through the bottle group circulation pipeline II4 for cooling. When the fire extinguishing agent liquid level reaches the first reflux mechanism on the other side, the fire extinguishing agent is returned to the liquid storage tank 22 from the bottle group circulation pipeline I3 through the first reflux mechanism. This can accurately cool the high-temperature position of the battery module 31 and form an efficient fire extinguishing measure of circulating cooling.

[0039] Furthermore, the phase change material is prepared by directly spraying or hot-pressing paraffin wax + 10% expanded graphite material onto the inner wall of the liquid storage tank 22 to a thickness of 2 mm. When the high-temperature fire extinguishing agent flows into the liquid storage tank 22, the phase change material absorbs heat and melts, and the fire extinguishing agent is cooled. After the fire extinguishing agent flows out, the phase change material releases heat to the environment, re-solidifies, and returns to a solid state, thereby forming a continuous circulation cooling of the inflowing fire extinguishing agent; at the same time, a silane hydrophobic agent is sprayed on the inner wall to reduce the residual fire extinguishing agent, and a flange cover is opened on the top of the liquid storage tank 22 to facilitate regular cleaning or replenishment of the phase change material.

[0040] Furthermore, the liquid storage tank 22 and the high-pressure nitrogen tank 23 are fixed in the bottle group placement compartment 2 through a bottle group bracket 24 .

[0041] Furthermore, the first filling mechanism includes a filling pipeline I6 and a pulse valve I7 arranged on the filling pipeline I. The filling pipeline I6 is located at the bottom of the battery storage compartment 1, and the filling pipeline I6 is connected to the bottle group circulation pipeline I3.

[0042] Furthermore, the first reflux mechanism includes a reflux pipeline II8 and an electric reflux valve II11 arranged on the reflux pipeline II8. The reflux pipeline II8 is located at the top position of the battery placement compartment 1, and the reflux pipeline II8 is connected to the bottle group circulation pipeline I3.

[0043] Furthermore, the second filling mechanism includes a filling pipeline II 16 and a pulse valve II 17 arranged on the filling pipeline II 16 . The filling pipeline II 16 is located at the bottom of the battery placement compartment 1 , and the filling pipeline II 16 is connected to the bottle group circulation pipeline II 4 .

[0044] Furthermore, the second reflux mechanism includes a reflux pipeline I18 and an electric reflux valve I19 arranged on the reflux pipeline I18. The reflux pipeline I18 is located at the top position of the battery placement compartment 1, and the reflux pipeline I18 is connected to the bottle group circulation pipeline II4.

[0045] Furthermore, the ports of the perfusion pipeline I6 and the perfusion pipeline II16 facing the battery module 31 are respectively provided with intelligent sensing nozzles 34, which can automatically adjust the spray mode according to the water pressure or flow.

[0046] Furthermore, filter screens 35 are respectively provided on the return line II8 and the return line I18.

[0047] Furthermore, the battery storage compartment 1 is made of fireproof, heat-insulating and hydrophobic materials, which can effectively control fire, block the spread of flames and prevent the fire extinguishing agent from adhering to the fire extinguishing agent so that the fire extinguishing agent can flow into the bottom of the compartment.

[0048] In one embodiment of the present invention, a micro bidirectional pump 13 and a micro liquid cooling device 14 are provided on the top of the bottle group placement bin 2, and the bottle group circulation pipeline I3 and the bottle group circulation pipeline II4 are connected to the micro liquid cooling device 14 through the pump group circulation pipeline I12 and the pump group circulation pipeline II20 respectively.

[0049] After the fire extinguishing agent flows into one end of the micro bidirectional pump 13, the inflowing fire extinguishing agent is cooled by the micro liquid cooling device 14, and then the fire extinguishing agent flows out through the other end of the micro bidirectional pump 13, and finally flows back into the battery placement compartment 1 to form a cycle.

[0050] Furthermore, the fire extinguishing agent in the liquid storage tank 22 adopts perfluorohexanone fire extinguishing agent, which has both insulation and efficient cooling performance. Combined with the automatic cooling of the liquid storage tank phase change material and the micro liquid cooling device 13, continuous fire extinguishing cooling and efficient circulation of abnormal batteries in the battery storage compartment 1 are achieved.

[0051] In one embodiment of the present invention, a trapezoidal liquid collecting trough 37 is provided at the bottom of the battery storage compartment 1 , and a self-priming filter pump 38 is provided at the bottom of the trapezoidal liquid collecting trough 37 . The self-priming filter pump 38 is connected to the liquid storage tank 22 through the reflux pipe III 28 .

[0052] Furthermore, the walls and bottom of the trapezoidal liquid collecting tank 37 are made of hydrophobic material to facilitate the recovery of the fire extinguishing agent.

[0053] In one embodiment of the present invention, a quick-release battery holder 32 is provided in the battery compartment 1 , and the quick-release battery holder 32 is detachably connected to the battery module 31 via a plurality of holder buckles 33 .

[0054] The quick-release battery holder 32 and multiple holder clips 33 can not only effectively fix abnormal batteries and prevent the spread of fire, but also support one-click rapid replacement of damaged parts, shortening maintenance time.

[0055] The bracket buckle 33 is automatically locked and unlocked by an electromagnetic lock. The pressure sensor monitors the contact pressure between the battery module 31 and the quick-release battery bracket 32 ​​in real time. When abnormal vibration or displacement is detected, the system automatically triggers the electromagnetic lock to reinforce it. When replacing the battery, it can be unlocked with one click through the control unit.

[0056] In one embodiment of the present invention, a fan 15 is provided on the side wall of the bottle group storage bin 2 for performing convection cooling on the liquid storage tank 22 , thereby accelerating the solidification of the phase change material in the liquid storage tank 22 .

[0057] Furthermore, the top wall of the battery storage compartment 1 and the side wall of the bottle group storage compartment 2 relative to the fan 15 are respectively provided with exhaust ports 21 for discharging excess gas to prevent excessive air pressure in the compartment.

[0058] In one embodiment of the present invention, the liquid storage tank 22 is connected to a liquid infusion pipeline 30 .

[0059] In one embodiment of the present invention, the high-pressure nitrogen tank 23 is connected to a gas supply pipeline 29 .

[0060] In one embodiment of the present invention, the high-pressure nitrogen tank 23 and the liquid storage tank 22 are connected via a pressure reducing valve 25 , a high-pressure hose 26 and a one-way solenoid valve 27 .

[0061] The high-pressure nitrogen tank 23 reduces the pressure of nitrogen through a pressure reducing valve 25 (0-10Mpa), and then passes the nitrogen into one end of the liquid storage tank 22 through a high-pressure hose 26 and a one-way solenoid valve 27. A pressure sensor is installed in the liquid storage tank 22 to monitor the pressure of the liquid storage tank, thereby dynamically adjusting the opening of the solenoid valve. A flexible air bag is used in the liquid storage tank 22 to separate the nitrogen and the fire extinguishing agent to avoid direct contact that may cause the fire extinguishing agent to volatilize.

[0062] In one embodiment of the present invention, an infrared temperature sensor 36 is provided on the top of the battery storage compartment 1 to detect infrared radiation released due to the increase in temperature of the battery module 31 to obtain the module temperature distribution.

[0063] In one embodiment of the present invention, a BMS warning system is provided in the battery module 31 , and the BMS warning system and the infrared temperature sensor 36 constitute a monitoring and warning unit.

[0064] Furthermore, the valve group mechanism includes multiple electric two-way valves 5 and multiple electric one-way valves 9. The multiple electric two-way valves 5 are respectively arranged on the bottle group circulation pipeline I3, the bottle group circulation pipeline II4, the pump group circulation pipeline I12 and the pump group circulation pipeline II20. The multiple electric one-way valves 9 are respectively arranged on the return pipeline II8, the return pipeline I18, the air supply pipeline 29 and the liquid supply pipeline 30.

[0065] Furthermore, filters 10 are provided on the return line II8 , the return line I18 , and the return line III28 .

[0066] Furthermore, it also includes a control unit, and all valves are connected to the control unit. The control unit can accurately control the on and off of each pipeline and the switching of the circulation loop according to the monitoring information, and control the flow rate of the fire extinguishing agent in the placement grid by adjusting the pulse frequency according to the battery status. It can also dynamically adjust the nitrogen pressure and flow, and all pipeline connections use a magnetic quick-release interface design, which can be disassembled and assembled without tools, facilitating subsequent maintenance and cleaning.

[0067] Fire extinguishing and cooling process:

[0068] After the system starts running, the monitoring and early warning unit maintains the monitoring state. When the battery module 31 in the battery storage compartment 1 is in an abnormal state, the BMS detects that the internal temperature of the battery module 31 is greater than 60°C, and the monitoring unit sends feedback to the control unit. The control unit starts a first-level response according to the preset action program, and opens the valve filling port and the corresponding circulation loop close to the high-temperature area through the battery temperature distribution detected by the infrared temperature sensor 36; starts the high-pressure nitrogen tank 23 in the bottle group storage compartment 2, and allows nitrogen to flow through the high-pressure hose 26 at a pressure of 0.5Mpa through the pressure reducing valve 25, and enters the liquid storage tank 22 through the one-way solenoid valve 27, thereby adjusting the electric two-way valve 5 according to the module temperature distribution in the battery compartment monitored by the infrared temperature sensor 36 to drive The dynamic fire extinguishing agent flows into the corresponding bottle group circulation pipeline I3 (bottle group circulation pipeline II4) at a low flow rate, and is released in the form of high-frequency mist through the pulse valve I7 (pulse valve II17) and the intelligent sensing nozzle 34 to evenly cover the surface of the high-temperature battery. After the battery is cooled, the vaporized fire extinguishing agent reaches a certain amount. In order to prevent the air pressure in the warehouse from being too high, the exhaust port 21 is opened to discharge excess gas; the liquid flows into the trapezoidal liquid collecting tank 37 at the bottom of the battery warehouse, and the stored fire extinguishing agent is filtered and recovered by the self-priming filter pump 38, and then flows through the reflux pipeline III28 and is re-filtered through the filter 10 and then flows back to the liquid storage tank 22 to be cooled by the internal phase change material, forming a cycle to continuously cool the battery modules in the warehouse.

[0069] If the temperature of the lithium battery module 31 continues to rise, when the BMS detects that the internal temperature of the battery module 31 reaches 100°C, or the battery temperature does not drop to room temperature and remain stable after the first-level response, and the information is fed back to the control unit, the control unit will start the second-level response according to the preset program, and open the valve filling port and the corresponding circulation loop close to the high-temperature area through the battery temperature distribution detected by the infrared temperature sensor 36; the pressure reducing valve 25 adjusts the nitrogen pressure to 5Mpa, driving the fire extinguishing agent to flow into the corresponding bottle group circulation pipeline I3 (bottle group circulation pipeline II4) at a high flow rate, and releases the fire extinguishing agent in the form of a low-frequency jet through the pulse valve I7 (pulse valve II17) and the intelligent sensing nozzle 34 to impact the high-temperature battery, adjust the power of the self-priming filter pump 38, increase the filtration and recovery efficiency of the fire extinguishing agent, and perform more efficient cooling treatment on the batteries in the warehouse to suppress thermal runaway.

[0070] If the temperature of the lithium battery module 31 continues to rise, the BMS detects that the internal temperature of the battery module 31 reaches 120°C, or the battery temperature does not drop to room temperature and remain stable after the second-level response, the third-level response is initiated, and the valve filling port close to the high-temperature area and the corresponding circulation loop are opened through the battery temperature distribution detected by the infrared temperature sensor 36; the pressure reducing valve 25 adjusts the nitrogen pressure to 10Mpa, drives the fire extinguishing agent to flow into the corresponding bottle group circulation pipeline I3 (bottle group circulation pipeline II4) at full flow, and injects the fire extinguishing agent into the battery compartment at a higher flow rate through the pulse valve I7 (pulse valve II17) and the intelligent sensing nozzle 34, closes the self-priming filter pump to allow the fire extinguishing agent to immerse the battery module, and when the liquid level exceeds the electric reflux valve I19 (electric reflux valve) on the top of the battery compartment wall under the corresponding circuit Ⅱ11), the valve is opened to allow the fire extinguishing agent to flow out and pass through the filter 35 for initial filtration, and then pass through the reflux pipe Ⅰ18 (reflux pipe Ⅱ8) and filter 10 for further filtration before flowing back to the liquid storage tank 22 to be cooled by the internal phase change material, forming a cycle and allowing the fire extinguishing agent to flow at a certain speed in the battery compartment; if during the three-stage circulation fire extinguishing cooling response process, the nitrogen pressure in the bottle group drops to less than 5Mpa, the system will automatically switch to the pump group perfusion circulation loop, switch the bottle group circulation pipe Ⅰ3 to the pump group circulation pipe Ⅰ12 connected in parallel with it, and switch the bottle group circulation pipe Ⅱ4 to the pump group circulation pipe Ⅱ20 connected in parallel with it, and maintain the perfusion fire extinguishing and cooling cycle by connecting the micro bidirectional pump 13 and the micro liquid cooling device 14, so as to continuously cool down the battery module and extinguish the fire.

[0071] During any response period, when the temperature of the lithium battery module 31 monitored by the BMS system or the infrared temperature sensor 36 drops to a safe temperature range (room temperature ±5°C) and remains stable for a period of time (at least 1 hour) and no longer rises, the control unit closes the high-pressure nitrogen tank 23, the pressure reducing valve 25, the one-way solenoid valve 27, the pulse valve and each electric valve. The system ends work and returns to standby mode, checks the system and promptly fills and maintains each device.

[0072] If the BMS system is damaged during thermal runaway during operation, the temperature status of the lithium battery module will be comprehensively judged in combination with the monitoring information of the infrared temperature sensor.

[0073] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, 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, and therefore cannot be understood as a limitation on the present invention.

[0074] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A new type of perfusion circulating cooling fire extinguishing system for lithium battery modules, characterized in that: include: A battery storage compartment (1) has an inner cavity in which a battery module (31) is arranged in an inverted manner; a first filling mechanism, a first reflux mechanism, a second filling mechanism, and a second reflux mechanism are arranged on a side wall of the battery storage compartment (1); the first filling mechanism and the first reflux mechanism are arranged on one side of the battery module (31), and the second filling mechanism and the second reflux mechanism are located on the other side of the battery module (31); A bottle group placement bin (2) has an inner cavity provided with a liquid storage tank (22) and a high-pressure nitrogen tank (23) in communication with each other, the liquid storage tank (22) being provided with a phase change material, the liquid storage tank (22) being connected with a bottle group circulation pipeline I (3) and a bottle group circulation pipeline II (4), the bottle group circulation pipeline I (3) being connected with the first filling mechanism and the first reflux mechanism, and the bottle group circulation pipeline II (4) being connected with the second filling mechanism and the second reflux mechanism; The valve group mechanism is used to control the flow direction of the fire extinguishing agent in the bottle group circulation pipeline I (3) and the bottle group circulation pipeline II (4).

2. A novel perfusion-type circulating cooling fire extinguishing system for lithium battery modules according to claim 1, characterized in that: A micro bidirectional pump (13) and a micro liquid cooling device (14) are provided on the top of the bottle group placement bin (2), and the bottle group circulation pipeline I (3) and the bottle group circulation pipeline II (4) are respectively connected to the micro liquid cooling device (14) through the pump group circulation pipeline I (12) and the pump group circulation pipeline II (20).

3. A novel perfusion-type circulating cooling fire extinguishing system for lithium battery modules according to claim 1, characterized in that: A trapezoidal liquid collecting trough (37) is provided at the bottom of the battery storage compartment (1), a self-priming filter pump (38) is provided at the bottom of the trapezoidal liquid collecting trough (37), and the self-priming filter pump (38) is connected to the liquid storage tank (22) through a reflux pipeline III (28).

4. A novel perfusion-type circulating cooling fire extinguishing system for lithium battery modules according to claim 1, characterized in that: A quick-release battery bracket (32) is provided in the battery placement compartment (1), and the quick-release battery bracket (32) is detachably connected to the battery module (31) via a plurality of bracket buckles (33).

5. A novel perfusion-type circulating cooling fire extinguishing system for lithium battery modules according to claim 1, characterized in that: A fan (15) is provided on the side wall of the bottle group placement bin (2).

6. A novel perfusion-type circulating cooling fire extinguishing system for lithium battery modules according to claim 1, characterized in that: The liquid storage tank (22) is connected to a liquid replenishing pipeline (30).

7. A novel perfusion-type circulating cooling fire extinguishing system for lithium battery modules according to claim 1, characterized in that: The high-pressure nitrogen tank (23) is connected to a gas supply pipeline (29).

8. The novel perfusion circulating cooling fire extinguishing system for lithium battery modules according to claim 1 is characterized in that: The high-pressure nitrogen tank (23) and the liquid storage tank (22) are connected via a pressure reducing valve (25), a high-pressure hose (26) and a one-way electromagnetic valve (27).

9. A novel perfusion-type circulating cooling fire extinguishing system for lithium battery modules according to claim 1, characterized in that: An infrared temperature sensor (36) is provided on the top of the battery storage compartment (1).

10. A novel perfusion-type circulating cooling fire extinguishing system for lithium battery modules according to claim 1, characterized in that: A BMS early warning system is provided in the battery module (31).

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