A fire protection system with a battery energy storage device

Abstract

The present invention discloses a fire-fighting system for a battery energy storage device, which belongs to the field of energy storage power stations. The fire-fighting system for a battery energy storage device comprises a frame, a battery placement cavity, a plurality of groups of battery placement cavities distributed along a horizontal array on the front face of the frame, and a plurality of battery placement cavities in each group distributed along a vertical array. The battery placement cavities are all upwardly inclined cubic structures, a cable assembly is provided on one side of the opening of the battery placement cavity, and the battery placement cavities are all used to insert lithium iron phosphate batteries. A strong heat dissipation mechanism for cooling the lithium iron phosphate batteries is provided on the outside of the frame; a woven net is provided on the lower wall of the battery placement cavity, and both sides of the woven net extend to both sides of the battery placement cavity respectively; a water bag is provided between the two sides of the woven net. The water bag can be realized by using an annular fire-proof structure as a fire-fighting measure on the outside of the lithium iron phosphate battery, and three fire-fighting operations can be performed without providing a valve, thereby reducing the fire-fighting cost of the battery energy storage device.

Description

Technical Field

[0001] The present invention relates to the field of energy storage power stations, and more particularly to a fire protection system of a battery energy storage device. Background Art

[0002] Energy storage power stations are established to regulate peak and valley electricity consumption. They generally come in two forms: pumped hydropower stations and ultra-large battery packs. Ultra-large battery packs are often composed of lithium iron phosphate batteries, which use lithium iron phosphate (LiFePO4) as the positive electrode material and carbon as the negative electrode material. Lithium iron phosphate batteries have a single-cell rated voltage of 3.2V and a charge cutoff voltage of 3.6V to 3.65V. They have the advantages of high operating voltage, high energy density, long cycle life, good safety performance, low self-discharge rate, and no memory effect, making them convenient for residential power supply.

[0003] A patent search revealed that a Chinese patent with publication number CN114432620A discloses an electrochemical energy storage power station fire protection system. The device includes a fire extinguishing device array, a liquid fire extinguishing agent storage tank, a centralized control module, a fire extinguishing agent delivery pump, a fire extinguishing agent pipeline in the cabinet, a liquid fire extinguishing agent supply pipeline, a display screen, and a power module. The gas fire extinguishing device array is composed of multiple fire extinguishing device storage tanks. Each fire extinguishing device storage tank is connected to the fire extinguishing agent pipeline in the cabinet through a fire extinguishing device drive valve at its tank port. The liquid fire extinguishing agent storage tank is connected to the liquid fire extinguishing agent supply pipeline through a fire extinguishing agent delivery pump. The liquid fire extinguishing agent supply pipeline is divided into two routes after passing through a one-way valve. One route is connected to the fire extinguishing agent pipeline in the cabinet through the fire extinguishing agent pipeline selection valve, and the other route is connected to the cabin fire fighting pipeline through the cabin pipeline selection valve. Although the fire extinguishing agent output selection valve is closed or confirmed to be closed, the cabin pipeline selection valve, the fire extinguishing agent pipeline selection valve, and the fire extinguishing device driving valve of the non-empty fire extinguishing device storage tank for the required fire extinguishing agent metering are opened, and the fire extinguishing agent is injected into the energy storage power station cabin through the cabin fire fighting pipeline to extinguish the fire. Then, the data detected by the fire detection device is continuously read in a set time period to judge the fire extinguishing effect;

[0004] However, when extinguishing a fire in a battery energy storage device, the above-mentioned patent sprays gaseous or liquid fire extinguishing agents onto individual out-of-control batteries through the fire extinguishing agent pipeline selection valve, the cabin pipeline selection valve, and the fire extinguishing agent output selection valve. However, a battery energy storage device often has multiple batteries arranged on a frame, and a large number of valves need to be set up corresponding to the batteries, resulting in an increase in the fire fighting cost of the battery energy storage device. To this end, we propose a fire fighting system for a battery energy storage device. Summary of the Invention

[0005] 1. Technical problems to be solved

[0006] In response to the problems existing in the prior art, the purpose of the present invention is to provide a fire protection system for a battery energy storage device. It can use an annular fire protection structure as a fire protection measure on the outside of the lithium iron phosphate battery, and can perform three-stage fire extinguishing without setting a valve, thereby reducing the fire protection cost of the battery energy storage device.

[0007] 2. Technical solution

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] A fire protection system of a battery energy storage device, comprising a frame,

[0010] Battery placement cavities, multiple groups of battery placement cavities are distributed along a horizontal array on the front of the frame, and multiple battery placement cavities in each group are distributed along a vertical array. The battery placement cavities are all upwardly inclined cubic structures. A cable assembly is provided on one side of the battery placement cavity opening. The battery placement cavities are all used to insert lithium iron phosphate batteries. The exterior of the frame is provided with a strong heat dissipation mechanism for cooling the lithium iron phosphate batteries.

[0011] A braided net is provided on the lower wall of the battery placement cavity, and two sides of the braided net extend to two sides of the battery placement cavity respectively;

[0012] A water bag is provided between two sides of the woven net, and each water bag is annular and coaxial with the battery placement cavity;

[0013] An airbag, which is arranged inside the water bag and has an annular structure and is coaxial with the water bag;

[0014] Internally threaded tubes, two groups of the internally threaded tubes are respectively installed on both sides of the airbag, and one end of at least two of the internally threaded tubes in each group is connected to the back of the lithium iron phosphate battery;

[0015] The water pool is arranged at the bottom of the frame and contains fire water. A supporting mechanism is arranged at the opening of the water pool.

[0016] The present invention successively bonds a woven net, a water bag, and an air bag in each battery placement cavity to form an annular fireproof structure, and then inserts lithium iron phosphate batteries into the annular fireproof structure one by one. The annular fireproof structure can be used as a fire-fighting measure on the outside of the lithium iron phosphate battery, and three fire-fighting operations can be performed without setting a valve, thereby reducing the fire-fighting cost of the battery energy storage device.

[0017] Furthermore, a fire water pipe is provided above the frame, and a plurality of fire sprinklers are distributed on the lower surface of the fire water pipe along a horizontal array. One end of the fire water pipe is a closed structure, and the other end of the fire water pipe is equipped with a booster pump. The fire water in the fire water pipe is sprayed into the interior of the energy storage power station along the fire sprinklers. The rapid spraying can respond to emergencies, quickly control fires, and prevent explosions in the energy storage power station.

[0018] Furthermore, a plurality of support rods are welded to the upper surface of the frame, and the upper ends of the support rods are hinged with clamps that are sleeved on the outside of the fire water pipes. The outsides of the support rods are provided with smoke monitoring units to support the fire water pipes and use the smoke monitoring units to monitor the smoke in the energy storage power station in real time. When smoke is detected, an alarm is promptly sent to the duty room.

[0019] Furthermore, the strong heat dissipation mechanism includes a fan arranged outside the frame, and a main air pipe is installed at the output end of the fan. One end of the main air pipe is a closed structure and extends to the upper edge of the frame. The lower surface of the main air pipe is located at the upper edge of the frame and has multiple branch pipes distributed along a horizontal array. One end of the branch pipes extends downward along the back of the frame and is a closed structure. Multiple air inlets are provided on both sides of the branch pipes. When smoke is detected, air is drawn in and the airflow is used to take away the heat from the lithium iron phosphate battery for strong heat dissipation, thereby facilitating the reduction of the temperature of the lithium iron phosphate battery and slowing down the spread of fire.

[0020] Furthermore, the flue gas monitoring unit includes a porous flange plate welded on one side of the support rod, and a flue gas sensor is installed through one side of the porous flange plate. A controller is connected between the flue gas sensors, which can contact the flue gas emitted by the burning lithium iron phosphate battery.

[0021] Furthermore, the support mechanism includes a step groove opened at the opening of the water pool, and a grille plate with a porous square plate structure is inserted inside the step groove. A storage groove for placing the grille plate is installed on one side of the water pool. The grille plate is placed flat in the step groove, which can support the staff and facilitate the staff to walk above the water pool. Finally, the grille plate is returned to the corresponding storage groove to prevent it from blocking the opening of the water pool.

[0022] Furthermore, a plurality of support plates are distributed along a horizontal array inside the water pool, and both sides of the support plates are respectively connected to the two sides of the water pool, the upper ends of the support plates are flush with the lower walls of the step grooves, and the lower ends of the support plates are provided with connecting holes. A plurality of support plates are used to support the bottom of the grille plate to unload the load of the grille plate and alleviate the degree of deformation of the grille plate caused by extrusion.

[0023] Furthermore, the upper edges of the support plates are bonded with silicone films, and both sides of the silicone films are respectively attached to both sides of the pool. A plurality of foam blocks are bonded to the end of the silicone film away from the corresponding support plate, and magnets are bonded to one side of the foam blocks. Two adjacent magnets are sucked together, pulling the edges of adjacent silicone films to fit together, forming a splash-proof layer on the liquid surface of the pool, and the waves stirred up by the lithium iron phosphate battery entering the water are blocked by the splash-proof layer.

[0024] 3. Beneficial effects

[0025] Compared with the prior art, the advantages of the present invention are:

[0026] (1) This solution sequentially bonds a woven net, a water bag, and an air bag in each battery placement cavity to form an annular fireproof structure. The lithium iron phosphate batteries are then inserted into the annular fireproof structure one by one, and the lithium iron phosphate batteries and the corresponding internal threaded tubes are tightened with bolts to lock the lithium iron phosphate batteries in the battery placement cavity. The annular fireproof structure can be used as a fire-fighting measure on the outside of the lithium iron phosphate battery. When a single lithium iron phosphate battery catches fire, its own high temperature melts the air bag, releasing perfluorohexanone gas for the initial fire extinguishing, and then melts the water bag, releasing fire water for the secondary fire extinguishing. If the lithium iron phosphate battery continues to explode, the woven net will then melt, and under the action of its own weight, it will pull the woven net, water bag, and air bag along the slope of the battery placement cavity into the corresponding water pool for the second fire extinguishing. The three fire extinguishing operations can be performed without setting a valve, which can reduce the fire-fighting cost of the battery energy storage device.

[0027] (2) When smoke is detected in this solution, the main engine in the duty room starts the fan to draw air, transport it along the main gas pipe to each branch pipe, and then spray it into each battery placement cavity through the air inlet. The air flow is used to take away the heat from the lithium iron phosphate battery, and strong heat dissipation is performed to facilitate lowering the temperature of the lithium iron phosphate battery and slowing down the spread of the fire.

[0028] (3) When operating the lithium iron phosphate battery in this scheme, the grating plate in the storage tank is taken out and placed flat in the step groove at the opening of the pool, which can support the staff and facilitate the staff to walk above the pool. Finally, the grating plate in the step groove is taken out and put back into the corresponding storage tank to prevent it from blocking the opening of the pool, so that the lithium iron phosphate battery that slides down can fall smoothly into the corresponding pool.

[0029] (4) In this solution, when the lithium iron phosphate battery of the present invention falls into the pool, the corresponding silicone membrane is supported by a foam block, and two adjacent magnets are sucked tightly, pulling the edges of the adjacent silicone membranes to fit together, forming a splash-proof layer on the liquid surface of the pool. The waves stirred up by the lithium iron phosphate battery entering the water are blocked by the splash-proof layer, and at the same time, the two adjacent silicone membranes and the magnet at one end of the silicone membrane are squeezed apart by its own inertia, and the battery slides into the water along the gap between the two adjacent silicone membranes. Then, the adjacent magnets attract each other, pulling the two adjacent silicone membranes to fit together again, and supported by the foam block, so that the battery can float on the liquid surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of the main view of the present invention;

[0031] Figure 2 It is a schematic diagram of the structure of the rear view of the present invention;

[0032] Figure 3 It is a schematic cross-sectional structural diagram of the present invention;

[0033] Figure 4 For the present invention Figure 1 Schematic diagram of the enlarged structure at A in the middle;

[0034] Figure 5 For the present invention Figure 1 Schematic diagram of the enlarged structure at B in the middle;

[0035] Figure 6 For the present invention Figure 2 Schematic diagram of the enlarged structure at C in the middle;

[0036] Figure 7 For the present invention Figure 3 Schematic diagram of the enlarged structure at point D in the middle.

[0037] Description of the numbers in the figure:

[0038] 1. Battery cavity; 2. Braided mesh; 3. Water bag; 4. Air bag; 5. Internally threaded pipe; 6. Water tank; 7. Fire hose; 8. Fire sprinkler; 9. Booster pump; 10. Support rod; 11. Clamp; 12. Fan; 13. Main gas pipe; 14. Branch pipe; 15. Air inlet; 16. Porous flange plate; 17. Smoke sensor; 18. Plastic frame; 19. Pin hole; 20. Protrusion; 21. Electrode socket; 22. Double-ended connecting wire; 23. Step groove; 24. Grille plate; 25. Storage slot; 26. Support plate; 27. Connecting hole; 28. Silicone membrane; 29. ​​Foam block; 30. Magnet. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] Example:

[0041] See also Figure 1-7 , a fire protection system of a battery energy storage device, comprising a frame,

[0042] Battery placement cavity 1, multiple groups of battery placement cavities 1 are distributed along the horizontal array on the front of the frame, and multiple battery placement cavities 1 in each group are distributed along the vertical array. The battery placement cavities 1 are all inclined upward cubic structures. A cable assembly is provided on one side of the opening of the battery placement cavity 1. The battery placement cavity 1 is used to insert lithium iron phosphate batteries. The outside of the frame is provided with a strong heat dissipation mechanism for cooling the lithium iron phosphate batteries;

[0043] The braided net 2 is set on the lower wall of the battery placement cavity 1 by gluing, and the two sides of the braided net 2 extend to the two sides of the battery placement cavity 1 respectively;

[0044] Water bladders 3 are arranged between the two sides of the woven net 2 by gluing. The water bladders 3 are all annular and coaxial with the battery placement cavity 1. The water bladders 3 are filled with sufficient fire water.

[0045] The airbag 4 is arranged inside the water bag 3 by gluing. The airbag 4 is annular and coaxial with the water bag 3. The airbag 4 is filled with a sufficient amount of perfluorohexanone gas.

[0046] Internally threaded tubes 5, two groups of internally threaded tubes 5 are respectively installed on both sides of the airbag 4 by gluing, and one end of at least two internally threaded tubes 5 in each group are connected to the back of the lithium iron phosphate battery by bolts;

[0047] The water pool 6 is arranged at the bottom of the frame and is filled with fire water. The opening of the water pool 6 is provided with a supporting mechanism.

[0048] When the present invention is working, first, a water pool 6 is built in a reserved groove on the ground of the energy storage power station, and a frame is set on one side of the water pool 6. The woven net 2, water bag 3 and air bag 4 are successively bonded in each battery placement cavity 1 to form an annular fireproof structure. Then, the lithium iron phosphate batteries are inserted into the annular fireproof structure one by one, and the lithium iron phosphate batteries and the corresponding internal threaded tubes 5 are tightened with bolts respectively to lock the lithium iron phosphate batteries in the battery placement cavity 1. The annular fireproof structure can be used as a fire-fighting measure on the outside of the lithium iron phosphate battery. If a single lithium iron phosphate battery catches fire, its own high temperature melts the air bag 4, releasing perfluorohexanone gas. The perfluorohexanone gas absorbs heat in the corresponding battery placement cavity 1 to perform initial fire extinguishing. As the lithium iron phosphate battery continues to heat up, the water bag is then melted. 3. Release the fire water for secondary fire extinguishing. The waste water slides down the slope of the battery placement cavity 1 into the corresponding water pool 6. If the lithium iron phosphate battery continues to explode, the braided net 2 will be melted and the structure of the braided net 2 will be deformed, causing its supporting strength to decrease. Under the action of its own weight, it will break free from the cable assembly, pulling the braided net 2, water bag 3 and air bag 4 to slide down the slope of the battery placement cavity 1 into the corresponding water pool 6, and immerse them in the fire water for another fire extinguishing. The third fire extinguishing can be performed without setting a valve, which can reduce the fire fighting cost of the battery energy storage device. If smoke is generated, the strong heat dissipation mechanism will be activated to dissipate strong heat in the energy storage power station. Finally, the support mechanism is placed at the opening of the water pool 6 to facilitate the staff to stand above the water pool 6 and salvage the scrapped lithium iron phosphate battery.

[0049] See Figure 1 and Figure 2 A fire water pipe 7 is provided above the frame, and a plurality of fire sprinklers 8 are distributed along a horizontal array on the lower surface of the fire water pipe 7. One end of the fire water pipe 7 is a closed structure, and the other end of the fire water pipe 7 is equipped with a booster pump 9. The water inlet end of the booster pump 9 is connected to the fire pipe. When the fire is large, the high-temperature gas triggers the fire sprinkler 8, and the fire water in the fire water pipe 7 is sprayed into the energy storage power station along the fire sprinkler 8. The fire water in the fire water pipe 7 is pressurized by the booster pump 9 and sprayed quickly, which can respond to emergencies, quickly control the fire, and prevent the energy storage power station from exploding.

[0050] See Figure 1 and Figure 4 A plurality of support rods 10 are welded on the upper surface of the frame. The upper ends of the support rods 10 are hinged with clamps 11 that are sleeved on the outside of the fire water pipe 7. A smoke monitoring unit is set on the outside of the support rods 10. The smoke monitoring unit is connected to the host in the duty room through a network cable. When the present invention is working, the support rods 10 and the corresponding clamps 11 support the fire water pipe 7, which makes it convenient for the fire water pipe 7 to be suspended in the air, and the smoke monitoring unit is used to monitor the smoke in the energy storage power station in real time. When smoke is found, the duty room is promptly alerted.

[0051] See Figure 1 、 Figure 2 and Figure 6The strong heat dissipation mechanism includes a fan 12 arranged outside the frame, and the fan 12 is connected to the main unit in the duty room through a signal repeater. A main air pipe 13 is installed at the output end of the fan 12. One end of the main air pipe 13 is a closed structure and extends to the upper edge of the frame. The lower surface of the main air pipe 13 is located at the upper edge of the frame and a plurality of branch pipes 14 are distributed along a horizontal array. One end of the branch pipes 14 extends downward along the back of the frame and is a closed structure. A plurality of air inlet holes 15 are provided on both sides of the branch pipes 14. When the present invention detects smoke, the main unit in the duty room starts the fan 12 to draw air and transport it to each branch pipe 14 along the main air pipe 13, and then sprays it into each battery placement cavity 1 along the air inlet holes 15. The airflow is used to take away the heat from the lithium iron phosphate battery for strong heat dissipation, thereby conveniently reducing the temperature of the lithium iron phosphate battery and slowing down the spread of the fire.

[0052] See Figure 1 and Figure 4 The flue gas monitoring unit includes a porous flange plate 16 welded to one side of the support rod 10. A flue gas sensor 17 is installed through one side of the porous flange plate 16. A controller is connected between the flue gas sensors 17. When the present invention is working, the porous flange plate 16 is used to support the corresponding flue gas sensor 17, so that the flue gas sensor 17 is suspended on one side of the corresponding support rod 10, so that it can contact the flue gas emitted by the burning lithium iron phosphate battery, transmit the detection signal to the controller, and send it to the host in the duty room via the signal repeater.

[0053] See Figure 2 and Figure 6 A plastic frame 18 is bonded between the back of the water bag 3 and the back of the corresponding air bag 4. The plastic frame 18 is annular and has multiple pin holes 19 on both sides. Both sides of the water bag 3 are integrally installed with protrusions 20 that pass through the pin holes 19. When the present invention is working, the plastic frame 18 is used to stick the back of the water bag 3 and the back of the corresponding air bag 4 to improve the tightness of the connection between the water bag 3 and the air bag 4, and the water bag 3 uses the protrusions 20 of the pin holes 19 to tighten the plastic frame 18, which is convenient for sliding down with the lithium iron phosphate battery.

[0054] See Figure 1 and Figure 5 The cable assembly includes two electrode sockets 21 installed on one side of the battery placement cavity 1. Double-ended connecting wires 22 are plugged into the openings of the two electrode sockets 21. One end of the double-ended connecting wires 22 is plugged into the electrodes of the corresponding lithium iron phosphate battery. When the present invention is working, the two electrode sockets 21 are respectively connected to the neutral wire and the live wire of the transmission line, and the two double-ended connecting wires 22 are respectively connected to the lithium iron phosphate battery and the transmission line, so that the lithium iron phosphate battery can be easily connected to the distribution network. When the lithium iron phosphate battery slides down, the corresponding double-ended connecting wire 22 is driven out of the electrode socket 21 without being greatly hindered.

[0055] See Figure 2 and Figure 3 The support mechanism includes a step groove 23 opened at the opening of the pool 6, and a grid plate 24 with a porous square plate structure is inserted inside the step groove 23. A storage groove 25 for placing the grid plate 24 is installed on one side of the pool 6. When operating the lithium iron phosphate battery of the present invention, the grid plate 24 in the storage groove 25 is taken out and placed flat in the step groove 23 at the opening of the pool 6. It can support the staff and facilitate the staff to walk above the pool 6. Finally, the grid plate 24 in the step groove 23 is taken out and put back into the corresponding storage groove 25 to prevent it from blocking the opening of the pool 6, so that the lithium iron phosphate battery that slides down can fall smoothly into the corresponding pool 6.

[0056] See Figure 1 、 Figure 2 and Figure 3 A plurality of support plates 26 are distributed in a horizontal array inside the water pool 6. Both sides of the support plates 26 are respectively connected to both sides of the water pool 6. The upper ends of the support plates 26 are flush with the lower walls of the step groove 23. The lower ends of the support plates 26 are provided with connecting holes 27. When the grille plate 24 is placed flat on the step groove 23, a plurality of support plates 26 are used to support the bottom of the grille plate 24, unloading the load of the grille plate 24 and alleviating the degree of deformation of the grille plate 24 caused by compression. The connecting holes 27 are used to circulate fire water, so as to facilitate the balance of the liquid level in various parts of the water pool 6 and reduce the overflow of fire water.

[0057] See Figure 1 、 Figure 3 and Figure 7 , the upper edge of the support plate 26 is bonded with a silicone film 28, and the two sides of the silicone film 28 are respectively attached to the two sides of the pool 6, and the end of the silicone film 28 away from the corresponding support plate 26 is bonded with a plurality of foam blocks 29, and one side of the foam block 29 is bonded with a magnet 30. When the lithium iron phosphate battery of the present invention falls into the pool 6, the foam block 29 is used to support the corresponding silicone film 28, and the two adjacent magnets 30 are sucked tightly, pulling the edges of the adjacent silicone films 28 to fit together, forming a splash-proof layer on the liquid surface of the pool 6. The waves stirred up by the lithium iron phosphate battery entering the water are blocked by the splash-proof layer to prevent the waves from splashing onto other lithium iron phosphate batteries. At the same time, the two adjacent silicone films 28 and the magnet 30 at one end of the silicone film 28 are squeezed apart by their own inertia, and the battery slides into the water along the gap between the two adjacent silicone films 28. Then, the adjacent magnets 30 attract each other, pulling the two adjacent silicone films 28 to fit together again, and supported by the foam block 29, so that the battery can float on the liquid surface.

[0058] Working principle: When working, first reserve a groove on the ground of the energy storage power station and build a water pool 6. Set the frame on one side of the water pool 6, and successively bond the woven net 2, water bag 3 and air bag 4 in each battery placement cavity 1 to form an annular fireproof structure. Then insert the lithium iron phosphate batteries one by one into the annular fireproof structure, and use bolts to tighten the lithium iron phosphate battery and the corresponding internal threaded tube 5 respectively to lock the lithium iron phosphate battery in the battery placement cavity 1. The annular fireproof structure can be used as a fire-fighting measure on the outside of the lithium iron phosphate battery.

[0059] When a single lithium iron phosphate battery catches fire, its own high temperature melts the airbag 4, releasing perfluorohexanone gas, which absorbs heat in the corresponding battery placement cavity 1 to perform the initial fire extinguishing.

[0060] As the lithium iron phosphate battery continues to heat up, the water bag 3 is melted, releasing fire water for secondary fire extinguishing, and the waste water slides down the slope of the battery placement cavity 1 into the corresponding water pool 6.

[0061] If the lithium iron phosphate battery continues to explode and then melts the woven net 2, the structure of the woven net 2 will be deformed, and its supporting strength will be reduced. Under the action of its own weight, it will break free from the cable assembly, pulling the woven net 2, water bag 3 and air bag 4 along the slope of the battery placement cavity 1 to slide into the corresponding water pool 6, and immerse them in the fire water for another fire extinguishing. The fire can be extinguished three times without setting a valve, which can reduce the fire fighting cost of the battery energy storage device.

[0062] If smoke is generated, the strong heat dissipation mechanism will be activated to dissipate strong heat inside the energy storage power station.

[0063] When smoke is detected in the present invention, the main engine in the duty room starts the fan 12 to draw air, transport it to each branch pipe 14 along the main air pipe 13, and then spray it into each battery placement cavity 1 along the air inlet 15. The air flow is used to take away the heat from the lithium iron phosphate battery, and strong heat dissipation is performed, which facilitates the reduction of the temperature of the lithium iron phosphate battery and slows down the spread of the fire.

[0064] When operating the lithium iron phosphate battery of the present invention, the grid plate 24 in the storage slot 25 is taken out and placed flat in the step slot 23 at the opening of the pool 6, which can support the staff and facilitate the staff to walk above the pool 6 to salvage the scrapped lithium iron phosphate battery. Finally, the grid plate 24 in the step slot 23 is taken out and put back into the corresponding storage slot 25 to prevent it from blocking the opening of the pool 6, so that the lithium iron phosphate battery that slides down can fall smoothly into the corresponding pool 6.

[0065] When the lithium iron phosphate battery of the present invention falls into the pool 6, the foam block 29 is used to support the corresponding silicone membrane 28, and the two adjacent magnets 30 are sucked tightly, pulling the edges of the adjacent silicone membranes 28 to fit together, forming a splash-proof layer on the liquid surface of the pool 6. The waves stirred up by the lithium iron phosphate battery entering the water are blocked by the splash-proof layer. At the same time, the two adjacent silicone membranes 28 and the magnet 30 at one end of the silicone membrane 28 are squeezed apart by its own inertia, and the battery slides into the water along the gap between the two adjacent silicone membranes 28. Then, the adjacent magnets 30 attract each other, pulling the two adjacent silicone membranes 28 to fit together again, and supported by the foam block 29, making it convenient to float on the liquid surface.

[0066] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A fire protection system of a battery energy storage device, comprising a frame, characterized in that: A battery placement cavity (1), wherein a plurality of groups of the battery placement cavities (1) are distributed along a horizontal array on the front of the frame, and a plurality of the battery placement cavities (1) in each group are distributed along a vertical array, and the battery placement cavities (1) are all in an upwardly inclined cubic structure, and a cable assembly is provided on one side of the opening of the battery placement cavity (1). The battery placement cavities (1) are all used to insert lithium iron phosphate batteries, and a strong heat dissipation mechanism for cooling the lithium iron phosphate batteries is provided on the outside of the frame; a woven net (2), the woven net (2) being arranged on the lower wall of the battery placement cavity (1), with two sides of the woven net (2) respectively extending to two sides of the battery placement cavity (1); A water bag (3), the water bag (3) being arranged between two sides of the woven net (2), the water bag (3) being an annular structure and being coaxial with the battery placement cavity (1); An air bag (4), the air bag (4) being arranged inside the water bag (3), the air bag (4) being an annular structure and being coaxial with the water bag (3); Internally threaded tubes (5), two groups of the internally threaded tubes (5) are respectively installed on both sides of the airbag (4), and one end of at least two of the internally threaded tubes (5) in each group is connected to the back of the lithium iron phosphate battery; A water pool (6), the water pool (6) is arranged at the bottom of the frame, and contains fire water. A support mechanism is provided at the opening of the water pool (6); A plurality of support plates (26) are distributed in a horizontal array inside the water pool (6); The upper edges of the support plates (26) are bonded with silicone films (28), and the two sides of the silicone films (28) are respectively attached to the two sides of the pool (6). The ends of the silicone films (28) away from the corresponding support plates (26) are bonded with multiple foam blocks (29), and one side of the foam blocks (29) is bonded with magnets (30).

2. A fire protection system of a battery energy storage device according to claim 1, characterized in that: A fire-fighting water pipe (7) is provided above the frame, and a plurality of fire-fighting nozzles (8) are distributed in a horizontal array on the lower surface of the fire-fighting water pipe (7). One end of the fire-fighting water pipe (7) is a closed structure, and the other end of the fire-fighting water pipe (7) is equipped with a booster pump (9).

3. A fire protection system of a battery energy storage device according to claim 2, characterized in that: A plurality of support rods (10) are welded to the upper surface of the frame, and the upper ends of the support rods (10) are hinged with clamps (11) sleeved on the outside of the fire water pipe (7), and the outsides of the support rods (10) are provided with smoke monitoring units.

4. A fire protection system of a battery energy storage device according to claim 1, characterized in that: The strong heat dissipation mechanism comprises a fan (12) arranged outside the frame, a main air pipe (13) is installed at the output end of the fan (12), one end of the main air pipe (13) is a closed structure and extends to the upper edge of the frame, the lower surface of the main air pipe (13) is located at the upper edge of the frame and is distributed along a horizontal array with a plurality of branch pipes (14), one end of each of the branch pipes (14) extends downward along the back of the frame and is a closed structure, and a plurality of air inlet holes (15) are opened on both sides of the branch pipe (14).

5. The fire protection system of the battery energy storage device according to claim 3, characterized in that: The smoke monitoring unit comprises a porous flange plate (16) welded to one side of the support rod (10), a smoke sensor (17) is installed through one side of the porous flange plate (16), and a controller is connected between the smoke sensors (17).

6. A fire protection system of a battery energy storage device according to claim 1, characterized in that: A plastic frame (18) is bonded between the back of the water bag (3) and the back of the corresponding air bag (4). The plastic frame (18) is an annular structure and has a plurality of pin holes (19) on both sides. Both sides of the water bag (3) are integrally installed with protrusions (20) that pass through the pin holes (19).

7. The fire protection system of a battery energy storage device according to claim 1, characterized in that: The cable assembly comprises two electrode jacks (21) installed on one side of the battery placement cavity (1), and the openings of the two electrode jacks (21) are both plugged with double-ended connecting wires (22), and one end of the double-ended connecting wires (22) is plugged into the corresponding electrodes of the lithium iron phosphate battery.

8. The fire protection system of a battery energy storage device according to claim 1, characterized in that: The support mechanism comprises a stepped groove (23) provided at the opening of the water pool (6), a grid plate (24) having a porous square plate structure is inserted into the interior of the stepped groove (23), and a storage groove (25) for placing the grid plate (24) is installed on one side of the water pool (6).

9. A fire protection system of a battery energy storage device according to claim 8, characterized in that: Both sides of the support plate (26) are respectively connected to both sides of the pool (6), the upper end of the support plate (26) is flush with the lower wall of the step groove (23), and the lower end of the support plate (26) is provided with a connecting hole (27).

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