Intermittently-spraying fire extinguishing device capable of pressure relief and resetting and fire extinguishing method

Abstract

Disclosed in the present invention are an intermittently-spraying fire extinguishing device capable of pressure relief and resetting and a fire extinguishing method. Said fire extinguishing device comprises a housing and a gas-generating fire suppressant provided in the housing. A front cover is arranged on the front side of the housing, and a spray hole is formed in the surface of the front cover, an end surface of the gas-generating fire suppressant being connected to one end of a start component. A rotary shaft rotationally connected to the front cover is arranged in the housing, the surface of the rotary shaft being provided with spiral blades, and the top of the rotary shaft being fixedly connected to the center of a rotary cover located on the upper side of the front cover. A spray opening is formed in the surface of the rotary cover, such that when the rotary cover rotates, the spray opening periodically aligns and misaligns with the spray hole. The lower side of the front cover is connected to the top of a pressure relief disc by means of a pressure relief spring, a positioning rod fitted to the spray hole being provided on the upper side of the pressure relief disc. The present invention can continuously perform an intermittent spraying process, thereby preventing the risk of reburning; in addition, when an abnormal sudden increase occurs in the internal pressure of the housing, the spray opening and the spray hole can be kept in communication so as to relieve pressure in time, and the intermittent spraying process can be resumed when the internal pressure of the housing returns to normal.

Description

An intermittent spraying fire extinguishing device capable of pressure relief and reset and a fire extinguishing method Technical Field

[0001] The present invention relates to the technical field of new energy battery fire extinguishing, and in particular to an intermittent spraying fire extinguishing device capable of decompression and resetting, and a fire extinguishing method. Background Art

[0002] When new energy batteries experience thermal runaway, they often continue to produce flammable gases. Traditional aerosol fire extinguishing devices are difficult to extinguish the flames instantly. Pulse fire extinguishing devices can extinguish the flames instantly but cannot achieve the effect of continuous suppression. When the pulse fire extinguishing device is used in combination with the traditional aerosol fire extinguishing device, the pulse fire extinguishing device can extinguish the flames instantly generated by the battery thermal runaway, and the traditional aerosol fire extinguishing device can suppress the flames to a certain extent after the pulse fire extinguishing device is sprayed. Theoretically, the combination of the two overcomes each other's shortcomings and can extinguish the flames instantly and achieve the effect of continuous suppression; however, the following problems still exist. Taking the battery compartment where the battery is located as an example, when the battery experiences thermal runaway, a large amount of flammable gas escapes from the battery and enters the battery box. At this time, after the fire extinguishing device is activated, due to the gas production of the traditional aerosol fire extinguishing device The amount is large, and the aerosol fire extinguishing agent will quickly fill the entire battery box (that is, the battery compartment where the battery is located). In this process, only part of the flammable gas is pushed out of the battery compartment. More flammable gas is often pressed inside the battery and cannot be completely discharged because the positive pressure in the battery compartment is too large when the aerosol fire extinguishing device is sprayed. Therefore, when the aerosol fire extinguishing device is completed, the pressure in the battery compartment drops, and a large amount of flammable gas escapes from the inside of the battery again, and there is still a risk of re-ignition; in addition, the fire extinguishing device currently used needs to consider the situation of abnormal pressure increase during the fire extinguishing process, so it needs to have a pressure relief function; therefore, it is necessary to improve the traditional aerosol fire extinguishing device and design a fire extinguishing device that can be continuously and intermittently sprayed, so that the pressure of the battery box increases and decreases periodically, and has a pressure relief function, thereby solving the above problems. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide an intermittent spraying fire extinguishing device and fire extinguishing method that can relieve pressure and reset, which can continuously perform the intermittent spraying process so that the pressure of the battery box increases and decreases periodically, which is conducive to the complete discharge of the combustible gas inside the battery in the battery box, preventing the risk of re-ignition, and can have a pressure relief function.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: an intermittent spraying fire extinguishing device that can relieve pressure and reset, comprising a shell and a gas-generating fire extinguishing agent arranged in the shell, a front cover is provided on the front side of the shell, a nozzle is provided on the surface of the front cover, the end face of the gas-generating fire extinguishing agent is connected to one end of the starting component, a rotating shaft rotatably connected to the front cover is provided in the shell, a spiral blade is provided on the surface of the rotating shaft, the top of the rotating shaft is fixedly connected to the center of the rotating cover located on the upper side of the front cover, a spray hole is provided on the surface of the rotating cover, when the rotating cover rotates, the spray hole and the nozzle periodically overlap and intersect, the lower side of the front cover is connected to the top of the pressure relief disk through a pressure relief spring, and the upper side of the pressure relief disk is provided with a positioning rod that cooperates with the nozzle.

[0005] Preferably, the top side of the rotating shaft is rotatably connected to the center of the front cover through a bearing.

[0006] Preferably, the pressure relief disc is a disc structure, a positioning rod is provided at the center position of its top, and a pressure relief rod is further provided at the outer edge position of its top, and the length of the positioning rod is greater than that of the pressure relief rod.

[0007] Preferably, the bottom of the pressure relief spring is connected to the pressure relief disk, the positioning rod is passed through the interior of the pressure relief spring, and the top of the pressure relief spring is connected to the edge area of ​​the nozzle through a mounting bracket.

[0008] Preferably, the gas-generating fire extinguishing agent is a columnar structure formed by pressing aerosol generating agent powder; and the starting component is an electric ignition head or a thermal wire structure.

[0009] Preferably, the outer edge of the front cover is threadedly connected to the top of the shell, and the bottom of the shell is threadedly connected to the outer edge of the rear cover.

[0010] Preferably, the gas-generating fire extinguishing agent is located in the area where the back cover is located, and a silica gel layer is provided between the outer surface of the gas-generating fire extinguishing agent and the inner surface of the back cover.

[0011] Preferably, the outer edge of the spiral blade is in sliding engagement with the inner wall of the shell, and the spiral blade is made of metal.

[0012] In addition, the present invention also discloses a fire extinguishing method of the above-mentioned intermittent spraying fire extinguishing device capable of pressure relief and reset, which comprises the following steps:

[0013] S1: When thermal runaway of the battery in the battery box occurs, the starting component ignites the gas-generating fire extinguishing agent, which produces gas and fire extinguishing substances;

[0014] S2: The airflow flows along the spiral channel formed by the spiral blades toward the location of the front cover. During this process, the spiral blades rotate under the thrust of the airflow.

[0015] S3: The rotation of the spiral blades causes the rotating shaft to rotate, which in turn drives the rotating cover to rotate, so that the spray holes on the surface of the rotating cover and the nozzles on the surface of the front cover periodically overlap and intersect;

[0016] S4: When the nozzle hole and the nozzle outlet coincide, the fire extinguishing substance is sprayed out from the nozzle outlet to extinguish the fire in the battery box. When the nozzle hole and the nozzle outlet intersect, the shell is sealed and the pressure is held back. Finally, the above process is repeated periodically to realize the intermittent spraying process, so that the pressure in the battery box increases and decreases periodically.

[0017] S5: When the pressure inside the battery box increases, the combustible gas diluted by the fire extinguishing material is pressed out from the gaps in the battery box. When the pressure inside the battery box decreases, the combustible gas inside the battery escapes and enters the battery box, and the above process is repeated in a cycle.

[0018] S6: When the gas-generating fire extinguishing agent generates gas too quickly, causing the pressure inside the shell to increase abnormally, the airflow impacts the bottom of the pressure relief disc. The impact force is greater than the elastic force of the pressure relief spring, causing the pressure relief spring to be compressed. At the same time, the positioning rod moves upward and passes through the nozzle, and then through the nozzle hole;

[0019] S7: After the positioning rod passes through the nozzle and the spray hole at the same time, the rotating cover is blocked and stops rotating. The high-pressure air inside the shell flows along the gap between the pressure relief rods and is discharged through the nozzle and the spray hole in sequence, thus completing the pressure relief process.

[0020] S8: When the pressure in the shell returns to normal, the pressure relief disc moves downward under the elastic force of the pressure relief spring, thereby driving the positioning rod to move downward, releasing the blocking effect on the rotating cover, and the rotating cover resumes rotation, so that the spray holes on the surface of the rotating cover and the nozzles on the surface of the front cover periodically overlap and interlace again, and the intermittent spraying process continues.

[0021] Furthermore, in S6, the process in which the positioning rod moves upward and passes through the nozzle and then passes through the spray hole is divided into the following two cases:

[0022] 1. When the spray hole and the nozzle coincide, the positioning rod moves upward directly and passes through the spray hole;

[0023] 2. When the spray hole and the nozzle are intertwined, the positioning rod stops moving, and then when the spray hole and the nozzle coincide, the positioning rod continues to move upward and passes through the spray hole.

[0024] Beneficial effects of the present invention:

[0025] The present invention applies the spiral blade used in the mechanical field to the field of fire extinguishing devices. The spiral blade is rotated by the thrust of the airflow, thereby driving the rotating cover to rotate, so that the spray holes on the surface of the rotating cover and the nozzles on the surface of the front cover periodically overlap and interleave, so that the fire extinguishing material can be continuously sprayed intermittently, so that the pressure of the battery box increases and decreases periodically, which is conducive to the complete discharge of combustible gases inside the batteries in the battery box and prevents the risk of re-ignition. In addition, because the spiral blade can be made of metal, when the high-temperature fire extinguishing material passes through this spiral channel, it can absorb part of the heat and play a cooling role, so that the temperature at the nozzle does not become too high. The spiral blade acts as a coolant in the aerosol fire extinguishing device. In addition, through the cooperation between the pressure relief spring, the pressure relief disk and the positioning rod, the present invention can keep the nozzle and the spray hole connected when the pressure inside the shell increases abnormally, thereby timely releasing the pressure. It can also resume the periodic overlap and interleave process of the spray hole and the nozzle when the pressure inside the shell returns to normal, and continue the intermittent spraying process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic diagram of the internal structure of an intermittent spraying fire extinguishing device capable of pressure relief and reset;

[0027] FIG2 is an enlarged structural diagram of the area where the pressure relief disc is located in FIG1 ;

[0028] FIG3 is a schematic diagram of the connection structure between the pressure relief disc, the positioning rod and the pressure relief rod;

[0029] FIG4 is a schematic diagram of the three-dimensional structure of the housing, the rotating shaft and the spiral blades in FIG1 ;

[0030] FIG5 is a schematic diagram of the three-dimensional structure of FIG1;

[0031] FIG6 is a schematic diagram of the top structure of the front cover in FIG1 . Implementation Method

[0032] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0033] As shown in Figures 1 to 6, an intermittent spraying fire extinguishing device that can relieve pressure and reset includes a shell 1 and a gas-generating fire extinguishing agent 2 arranged in the shell 1. A front cover 3 is provided on the front side of the shell 1, and a nozzle 4 is provided on the surface of the front cover 3. The end face of the gas-generating fire extinguishing agent 2 is connected to one end of the starting component 5. A rotating shaft 6 rotatably connected to the front cover 3 is provided in the shell 1, and a spiral blade 7 is provided on the surface of the rotating shaft 6. The top of the rotating shaft 6 is fixedly connected to the center of a rotating cover 8 located on the upper side of the front cover 3. A nozzle 9 is provided on the surface of the rotating cover 8. When the rotating cover 8 rotates, the nozzle 9 and the nozzle 4 periodically overlap and intersect. The lower side of the front cover 3 is connected to the top of the pressure relief disk 13 through a pressure relief spring 12. The upper side of the pressure relief disk 13 is provided with a positioning rod 14 that cooperates with the nozzle 4.

[0034] Preferably, the top side of the rotating shaft 6 is rotatably connected to the center of the front cover 3 through a bearing. The bearing can effectively limit the rotating shaft 6, making its rotation process stable and reliable, while preventing the rotating shaft 6 from axial movement.

[0035] Preferably, the pressure relief disc 13 is a circular disc with a positioning rod 14 positioned at the center of its top and a pressure relief rod 15 positioned at the outer edge of its top. The positioning rod 14 is longer than the pressure relief rod 15. In this embodiment, the pressure relief rod 15 prevents the pressure relief disc 13 from moving upward to abut against the bottom of the front cover 3 and thereby obstructing the nozzle 4. The pressure relief rod 15 ensures a gap between the pressure relief disc 13 and the front cover 3.

[0036] Preferably, the bottom of the pressure relief spring 12 is connected to the pressure relief disk 13 , the positioning rod 14 is passed through the pressure relief spring 12 , and the top of the pressure relief spring 12 is connected to the edge area of ​​the nozzle 4 through the mounting bracket 16 .

[0037] Preferably, the gas-generating fire extinguishing agent 2 is a cylindrical structure formed by pressing aerosol generating agent powder; the activating component 5 is an electric ignition head or a thermal wire structure. This type of aerosol generating agent pressed into a cylindrical structure burns more slowly than a powdered aerosol generating agent, ensuring the continuous release of the fire extinguishing agent.

[0038] The aerosol generator is a prior art, for example, the invention patent disclosed in Chinese Patent Publication No. CN101745195B is "An aging-resistant aerosol generator and its preparation process", which discloses that the aerosol generator is composed of an oxidant, a reducing agent, and a binder. The oxidant is potassium nitrate, the binder is phenolic resin, and the reducing agent is melamine. The mass percentages thereof are: potassium nitrate 74% to 80%, phenolic resin 8% to 15%, and the balance is melamine.

[0039] Its preparation method is:

[0040] Step 1: dissolving phenolic resin in ethanol to prepare a phenolic resin solution with a mass concentration of 40% to 55%;

[0041] Step 2: Grind the oxidizing agent and reducing agent to a fineness of 80-200 standard mesh, mix them according to the required proportion, and sieve them through 80-200 mesh three times to make them evenly mixed;

[0042] Step 3: Then add the phenolic resin solution to the mixed powder, stir for 10 minutes, and then use a 40-mesh screen to force granulate. Then dry the agent in an environment with a temperature of 40°C and a relative humidity of less than 20% until the volatile components are less than 1%;

[0043] Step 4: The dried medicine is pressed under a pressure of 10 MPa to form an aerosol generating agent column structure.

[0044] When the starting component 5 is an electric ignition head, it can be connected to a fire detection device, such as a temperature sensor and / or a smoke sensor. When a fire or overheating condition occurs, the fire detection device detects the high temperature generated within the battery compartment and sends a signal to the microprocessor, which controls the starting component 5 to ignite the gas-generating fire extinguishing agent 2. If the starting component 5 is a thermistor, the fire can be directly ignited by the thermistor, which then directly ignites the gas-generating fire extinguishing agent 2. This eliminates the need for additional fire detection devices or other external equipment, resulting in a simpler and more cost-effective design.

[0045] Preferably, the outer edge of the front cover 3 is threadedly connected to the top of the housing 1, and the bottom of the housing 1 is threadedly connected to the outer edge of the rear cover 10. Through this threaded connection method, the convenience of installation of the entire fire extinguishing device can be improved and the production process is convenient.

[0046] Preferably, the gas-generating fire extinguishing agent 2 is located in the area where the back cover 10 is located, and a silicone layer 11 is provided between the outer surface of the gas-generating fire extinguishing agent 2 and the inner surface of the back cover 10. The silicone layer 11 can effectively isolate the heat generated by the combustion of the gas-generating fire extinguishing agent 2, preventing the surface temperature of the back cover 10 and the housing 1 from being too high.

[0047] Preferably, the outer edge of the spiral blade 7 slides in engagement with the inner wall of the housing 1, and the spiral blade 7 is made of metal. In the present invention, the outer diameter of the spiral blade 7 is slightly smaller than the inner wall of the housing 1. This prevents the fire extinguishing material from being ejected upward through the gap between the blade edge and the inner wall of the housing 1, and also reduces the sliding friction between the spiral blade 7 and the inner wall of the housing 1 during rotation. Since the combustion of the gas-generating fire extinguishing agent 2 (e.g., an aerosol generating agent) generates high-temperature substances, a metal spiral blade 7 can absorb some of the heat as the high-temperature fire extinguishing material passes through this spiral channel, thus cooling the material and preventing the temperature at the nozzle 4 from being excessively high. The spiral blade 7 acts as a coolant in the aerosol fire extinguishing device.

[0048] Preferably, a diaphragm is also attached to the spray hole 9 on the surface of the rotating cover 8, which can prevent moisture in the outside air from entering through the spray hole 9 and the corresponding gap during the storage and transportation stage, thereby preventing the fire extinguishing agent from absorbing moisture. At the same time, the diaphragm itself is easy to rupture when under pressure, so it does not affect the spraying process of the fire extinguishing device.

[0049] In addition, the present invention also discloses a fire extinguishing method of the above-mentioned intermittent spraying fire extinguishing device capable of pressure relief and reset, which comprises the following steps:

[0050] S1: When a battery in the battery box experiences thermal runaway, the starting component 5 ignites the gas-generating fire extinguishing agent 2, which generates gas and fire extinguishing substances;

[0051] S2: The airflow flows along the spiral channel formed by the spiral blade 7 toward the position of the front cover 3. During this process, the spiral blade 7 rotates under the thrust of the airflow;

[0052] S3: The rotation of the spiral blade 7 causes the rotating shaft 6 to rotate, which in turn drives the rotating cover 8 to rotate, so that the spray holes 9 on the surface of the rotating cover 8 and the nozzles 4 on the surface of the front cover 3 periodically overlap and intersect;

[0053] S4: When the spray hole 9 and the nozzle 4 coincide with each other, the fire extinguishing material is sprayed out from the nozzle 4 to extinguish the fire in the battery box. When the spray hole 9 and the nozzle 4 intersect, the shell 1 is sealed and the pressure is held. Finally, the above process is repeated periodically to realize the intermittent spraying process, so that the pressure in the battery box increases and decreases periodically. In this step, when the fire extinguishing material is sprayed out from the nozzle to extinguish the fire in the battery box, the gas inside the battery box increases, causing the pressure to increase. When the shell is sealed and the pressure is held, the internal pressure of the battery box is released from the gap of the battery box itself, and the pressure decreases. Therefore, the pressure in the battery box increases and decreases periodically.

[0054] S5: When the pressure inside the battery box increases, the combustible gas diluted by the fire extinguishing substance is pressed out from the gaps in the battery box. When the pressure inside the battery box decreases, the combustible gas inside the battery escapes and enters the battery box, and the above process is repeated. Through this low-pressure and high-pressure reciprocating cycle, the combustible gas generated in the battery can be diluted by the fire extinguishing substance and continuously discharged from the battery box, completing the entire fire extinguishing process and effectively preventing the risk of re-ignition.

[0055] S6: When the gas-generating fire extinguishing agent 2 generates gas too quickly, causing the pressure in the housing 1 to increase abnormally, the gas flow impacts the bottom of the pressure relief disk 13. The impact force is greater than the elastic force of the pressure relief spring 12, causing the pressure relief spring 12 to be compressed. At the same time, the positioning rod 14 moves upward and passes through the nozzle 4 and then through the nozzle hole 9.

[0056] S7: After the positioning rod 14 passes through the nozzle 4 and the spray hole 9 at the same time, the rotating cover 8 is blocked and stops rotating. The high-pressure airflow inside the housing 1 follows the gap between the pressure relief rods 15 and is discharged through the nozzle 4 and the spray hole 9 in sequence, thus completing the pressure relief process.

[0057] S8: When the pressure in the housing 1 returns to normal, the pressure relief disc 13 moves downward under the elastic force of the pressure relief spring 12, thereby driving the positioning rod 14 to move downward, releasing the blocking effect on the rotating cover 8, and the rotating cover 8 resumes rotation, so that the spray holes 9 on the surface of the rotating cover 8 and the nozzles 4 on the surface of the front cover 3 periodically overlap and interlace again, and the intermittent spraying process continues.

[0058] Furthermore, in S6, the process in which the positioning rod 14 moves upward and passes through the nozzle 4 and then passes through the nozzle hole 9 is divided into the following two situations:

[0059] 1. When the spray hole 9 and the nozzle 4 coincide with each other, the positioning rod 14 directly moves upward and passes through the spray hole 9;

[0060] Second, when the spray hole 9 and the nozzle 4 are interlaced, the positioning rod 14 stops moving, and then when the spray hole 9 and the nozzle 4 overlap, the positioning rod 14 continues to move upward and passes through the spray hole 9.

[0061] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The embodiments and features in the embodiments of this application may be arbitrarily combined with each other unless they conflict. The scope of protection of the present invention shall be the technical solutions described in the claims, including equivalent alternatives to the technical features of the technical solutions described in the claims. Equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. An intermittent spraying fire extinguishing device capable of pressure relief and reset, comprising a housing (1) and a gas-generating fire extinguishing agent (2) disposed in the housing (1), a front cover (3) being disposed on the front side of the housing (1), a nozzle (4) being disposed on the surface of the front cover (3), an end surface of the gas-generating fire extinguishing agent (2) being connected to one end of a starting component (5), characterized in that: A rotating shaft (6) rotatably connected to the front cover (3) is provided in the housing (1), a spiral blade (7) is provided on the surface of the rotating shaft (6), the top of the rotating shaft (6) is fixedly connected to the center of a rotating cover (8) located on the upper side of the front cover (3), a spray hole (9) is provided on the surface of the rotating cover (8), and when the rotating cover (8) rotates, the spray hole (9) and the nozzle (4) overlap and intersect periodically, the lower side of the front cover (3) is connected to the top of the pressure relief disk (13) via a pressure relief spring (12), and a positioning rod (14) cooperating with the nozzle (4) is provided on the upper side of the pressure relief disk (13).

2. The intermittent spraying fire extinguishing device capable of pressure relief and reset according to claim 1, characterized in that: The top side of the rotating shaft (6) is rotatably connected to the center of the front cover (3) via a bearing.

3. The intermittent spraying fire extinguishing device capable of pressure relief and reset according to claim 1, characterized in that: The pressure relief disc (13) is a disc structure, a positioning rod (14) is arranged at the center position of the top thereof, and a pressure relief rod (15) is also arranged at the outer edge position of the top thereof, and the length of the positioning rod (14) is greater than the length of the pressure relief rod (15).

4. The intermittent spraying fire extinguishing device capable of pressure relief and reset according to claim 3, characterized in that: The bottom of the pressure relief spring (12) is connected to the pressure relief disk (13), the positioning rod (14) is inserted into the pressure relief spring (12), and the top of the pressure relief spring (12) is connected to the edge area of ​​the nozzle (4) through the mounting bracket (16).

5. The intermittent spraying fire extinguishing device capable of pressure relief and reset according to claim 1, characterized in that: The gas-generating fire extinguishing agent (2) is a columnar structure formed by pressing aerosol generating agent powder; the starting component (5) is an electric ignition head or a thermal wire structure.

6. The intermittent spraying fire extinguishing device capable of pressure relief and reset according to claim 1, characterized in that: The outer edge of the front cover (3) is threadedly connected to the top of the shell (1), and the bottom of the shell (1) is threadedly connected to the outer edge of the rear cover (10).

7. The intermittent spraying fire extinguishing device capable of pressure relief and reset according to claim 6, characterized in that: The gas-generating fire extinguishing agent (2) is located in the area where the rear cover (10) is located, and a silica gel layer (11) is provided between the outer surface of the gas-generating fire extinguishing agent (2) and the inner surface of the rear cover (10).

8. The intermittent spraying fire extinguishing device capable of pressure relief and reset according to claim 1, characterized in that: The outer edge of the spiral blade (7) is slidably matched with the inner wall of the shell (1), and the spiral blade (7) is made of metal.

9. A fire extinguishing method using the pressure-releasing and resetting intermittent spraying fire extinguishing device according to any one of claims 1 to 8, characterized in that: It includes the following steps: S1: When a battery in the battery box experiences thermal runaway, the starting component (5) ignites the gas-generating fire extinguishing agent (2), and the gas-generating fire extinguishing agent (2) generates gas and fire extinguishing substances; S2: the airflow flows along the spiral channel formed by the spiral blade (7) toward the position of the front cover (3). During this process, the spiral blade (7) rotates due to the thrust of the airflow; S3: During the rotation of the spiral blade (7), the rotating shaft (6) is rotated, thereby driving the rotating cover (8) to rotate, so that the spray holes (9) on the surface of the rotating cover (8) and the spray ports (4) on the surface of the front cover (3) are periodically overlapped and staggered; S4: When the spray hole (9) and the nozzle (4) overlap, the fire extinguishing substance is sprayed out from the nozzle (4) to extinguish the fire in the battery box. When the spray hole (9) and the nozzle (4) intersect, the shell (1) is sealed and the pressure is held. Finally, the above process is repeated periodically to realize an intermittent spraying process, so that the pressure in the battery box increases and decreases periodically. S5: When the pressure in the battery box increases, the combustible gas diluted by the fire extinguishing material is pressed out from the gap of the battery box. When the pressure in the battery box decreases, the combustible gas inside the battery escapes and enters the battery box, and the above process is repeated in a cycle. S6: When the gas-generating fire extinguishing agent (2) generates gas at an excessively fast speed, causing the pressure in the housing (1) to increase abnormally, the gas flow impacts the bottom of the pressure relief disk (13). The impact force is greater than the elastic force of the pressure relief spring (12), causing the pressure relief spring (12) to be compressed. At the same time, the positioning rod (14) moves upward and passes through the nozzle (4), and then passes through the nozzle hole (9). S7: After the positioning rod (14) passes through the nozzle (4) and the spray hole (9) at the same time, the rotating cover (8) is blocked and stops rotating, and the high-pressure airflow inside the housing (1) is discharged along the gap between the pressure relief rods (15) through the nozzle (4) and the spray hole (9) in sequence, thereby performing a pressure relief process; S8: When the pressure in the housing (1) returns to normal, the pressure relief disc (13) moves downward due to the elastic force of the pressure relief spring (12), thereby driving the positioning rod (14) to move downward, thereby releasing the blocking effect on the rotating cover (8), and the rotating cover (8) resumes rotation, so that the spray holes (9) on the surface of the rotating cover (8) and the spray ports (4) on the surface of the front cover (3) are periodically overlapped and staggered again, and the intermittent spraying process continues.

10. The fire extinguishing method according to the intermittent spraying type fire extinguishing device capable of pressure relief and reset according to claim 9, characterized in that: In S6, the process in which the positioning rod (14) moves upward and passes through the nozzle (4) and then passes through the nozzle hole (9) is divided into the following two situations:

1. When the spray hole (9) and the nozzle (4) coincide with each other, the positioning rod (14) directly moves upward and passes through the spray hole (9); Second, when the spray hole (9) and the nozzle (4) are interlaced, the positioning rod (14) stops moving, and then when the spray hole (9) and the nozzle (4) overlap, the positioning rod (14) continues to move upward and passes through the spray hole (9).

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