Spiral fire-retardant type anti-explosion pressure release valve

Abstract

The utility model relates to the technical field of battery pressure release valves, and discloses a spiral fire-retardant type explosion-proof pressure release valve which comprises a shell, a through hole is formed in the bottom of the shell, and a fire-retardant assembly is arranged on the end face of the shell. According to the spiral fire-retardant type anti-explosion pressure release valve, in the spiral exhaust duct, the spiral structure of the spiral exhaust duct can enable airflow to generate centrifugal force, combustible phosphorus, carbon and other particles in gas can generate a separation effect under the action of the centrifugal force and are attached to the pipe wall, and therefore after high-temperature gas is exhausted and makes contact with oxygen in the atmosphere, further combustion is not generated any more; and under the action of centrifugal force, flammable phosphorus, carbon and other particles can be thrown to the inner wall of the spiral exhaust duct, high-pressure airflow continuously fluctuates among the grids, then part of the phosphorus, carbon and other particles fall on the inner walls of the grids, combustible particles are further prevented from being discharged, and the further combustion effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pressure relief valve technical field, concretely is a kind of helical fire barrier explosion relief valve. BACKGROUND

[0002] Chemical energy storage battery and automobile power battery pack are generally designed with explosion relief valve technology to realize internal pressure regulation and safety protection, when battery occurs abnormal in running process, such as overcharge, overdischarge, short circuit or thermal runaway, it can cause internal gas to accumulate rapidly, thereby making the internal pressure of battery pack rise sharply, in order to prevent battery pack shell rupture or explosion due to excessive pressure, usually a special explosion relief valve is installed.

[0003] But the above-mentioned pressure relief valve in actual use process, when gas combustible particles are more in the process of thermal runaway, flame will from pressure relief valve, quickly ignite surrounding battery or combustible object, flame rapidly spreads to cause greater security risk;In view of this, we propose a helical fire barrier explosion relief valve. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a helical fire barrier explosion relief valve to solve the problems raised in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme: a helical fire barrier explosion relief valve, including shell, the bottom of the shell is provided with through-hole, the end surface of the shell is provided with fire barrier assembly, the fire barrier assembly includes:

[0006] Spring, the spring is sleeved on the outer wall of guide rod, the guide rod is fixedly connected with the body, the inner wall of the body is sleeved with magnet, the top of the magnet is provided with iron sleeve;

[0007] Piston, the piston is threadedly connected with iron sleeve, the top of the piston is fixedly connected with gas permeable membrane, the top of the gas permeable membrane is provided with pressure ring, the top of the pressure ring is provided with iron sheet;

[0008] Spiral air exhaust duct, the bottom of the body is fixedly connected with spiral air exhaust duct, the inner wall of the spiral air exhaust duct is fixedly connected with grid.

[0009] Preferably, the body is fixedly connected with battery pack by screw, the shell is fixedly connected at the bottom end of the body, the shell is sleeved with spring, and the spring is used to provide elastic force, so that the piston adheres to the inner sealing ring.

[0010] Preferably, the bottom end surface of the body is sleeved with an outer sealing ring, the outer sealing ring abuts against the outer wall of the battery pack, the top end surface of the body is sleeved with an inner sealing ring, the inner sealing ring is sleeved with the piston, and the sealing degree of the pressure relief valve is maintained when no internal gas of the battery pack rapidly accumulates.

[0011] Preferably, the shell is provided with a snap spring, the outer wall of the shell is sleeved with a snap ring pressing ring, the snap spring abuts against the snap ring pressing ring, the snap spring limits the longitudinal position of the guide rod, and the closing of the pressure relief valve caused by accidental operation after the valve is opened is avoided.

[0012] Preferably, the pressing ring is sleeved with the inner wall of the piston, the outer wall of the iron sheet is sleeved with the inner wall of the piston, the outer wall of the piston is sleeved with the upper cover, and the upper cover abuts against the iron sheet; when the iron sheet and the upper cover are kept flat, it is indicated that the pressure relief valve has no gas leakage.

[0013] Preferably, the spiral exhaust duct is arranged in the inside of the battery pack, and the inside of the spiral exhaust duct is arranged in a snail shape; the spiral structure of the exhaust passage can make the gas flow generate centrifugal force; combustible phosphorus carbon particles and the like in the gas can generate a separation effect under the action of the centrifugal force and adhere to the pipe wall.

[0014] Preferably, the inner wall of the spiral exhaust duct is provided with a plurality of groups of micropores, and the plurality of groups of micropores are arranged at equal intervals on the inner wall of the spiral exhaust duct.

[0015] Compared with the prior art, the spiral fire-resistant explosion-proof pressure relief valve has the following beneficial effects:

[0016] 1. The spiral fire-resistant explosion-proof pressure relief valve is provided with a fire-resistant assembly; gas enters the fire-resistant assembly from the inlet of the spiral exhaust duct arranged in the inside of the battery pack, then the gas flow drives the piston to move upward, and then the gas flow is released to the outside environment, so that the pressure of the battery pack is reduced, explosion of the battery pack caused by excessive pressure is avoided, in the spiral exhaust duct, the spiral structure of the spiral exhaust duct can make the gas flow generate centrifugal force; combustible phosphorus carbon particles and the like in the gas can generate a separation effect under the action of the centrifugal force and adhere to the pipe wall, so that the high-temperature gas discharged does not further burn after contacting with oxygen in the atmosphere, the propagation of the burning is slowed down, the flame spreading speed after thermal runaway occurs is prevented or delayed; under the action of the centrifugal force, the combustible phosphorus carbon particles and the like are thrown to the inner wall of the spiral exhaust duct; the high-pressure gas flow fluctuates between the grids, the flow rate of the gas is reduced, and then part of the phosphorus carbon particles and the like fall on the inner wall of the grid, so that the effect of further preventing the combustible particles from being discharged to further burn is further achieved.

[0017] 2、The spiral fire barrier explosion-proof pressure relief valve is provided with micropores, combustible particles usually have small particle size, under the action of van der Waals force and the like, they are easily adsorbed and retained by the micropore wall surface, thereby reducing the further diffusion of the particles and further blocking the combustible particles from being discharged to produce further combustion effect. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a main body structure schematic view of the utility model;

[0019] Figure 2 It is a main body explosion structure schematic view of the utility model;

[0020] Figure 3 It is a main body cross section structure schematic view of the utility model;

[0021] Figure 4 It is a main body Figure 3 A region structure schematic view of the utility model;

[0022] Figure 5 It is a spiral air exhaust duct amplification structure schematic view of the utility model.

[0023] In the figure: 1, shell; 2, fire barrier assembly; 201, spring; 202, guide rod; 203, outer sealing ring; 204, snap spring; 205, snap ring pressure ring; 206, body; 207, inner sealing ring; 208, magnet; 209, iron sleeve; 210, piston; 211, gas permeable membrane; 212, pressure ring; 213, iron sheet; 214, spiral air exhaust duct; 215, grid; 3, upper cover; 4, micropore. DETAILED DESCRIPTION

[0024] As Figures 1-5 shown, the utility model provides a technical scheme: a spiral fire barrier explosion-proof pressure relief valve, including shell 1, the bottom of shell 1 is provided with through hole, the end face of shell 1 is provided with fire barrier assembly 2, fire barrier assembly 2 includes spring 201, guide rod 202, outer sealing ring 203, snap spring 204, snap ring pressure ring 205, body 206, inner sealing ring 207, magnet 208, iron sleeve 209, piston 210, gas permeable membrane 211, pressure ring 212, iron sheet 213, spiral air exhaust duct 214 and grid 215.

[0025] In an embodiment of the utility model, spring 201 is sleeved on the outer wall of guide rod 202, guide rod 202 is fixedly connected with the body 206, the inner wall of body 206 is fixedly connected with magnet 208, the top of magnet 208 is provided with iron sleeve 209, body 206 is fixedly connected with battery pack through screw, shell 1 is fixedly connected at the bottom of body 206, shell 1 is sleeved with spring 201, spring 201 is used to provide elastic force, makes piston 210 adhere to inner sealing ring 207, the outer sleeve of shell 1 is provided with snap spring 204, the outer wall of shell 1 is sleeved with snap ring 205, snap spring 204 and snap ring 205 abut, snap spring 204 limits the longitudinal position of guide rod 202, avoids the closing of valve pressure relief valve caused by accidental operation after opening valve.

[0026] The bottom end surface of body 206 is sleeved with outer sealing ring 203, and the outer wall of the battery pack abuts against the outer sealing ring 203. When there is no rapid accumulation of internal gas in the battery pack, the sealing degree of the pressure relief valve is maintained. The piston 210 is threadedly connected with the iron sleeve 209. The top end surface of the body 206 is sleeved with an inner sealing ring 207. The inner sealing ring 207 is sleeved with the piston 210. The iron sleeve 209 is magnetically connected with the magnet 208. The iron sleeve 209 and the piston 210 are pulled towards the body 206 by magnetism. The top of the piston 210 is fixedly connected with a breathable membrane 211. The top of the breathable membrane 211 is provided with a compression ring 212. The top of the compression ring 212 is provided with an iron sheet 213. The compression ring 212 is sleeved with the inner wall of the piston 210. The outer wall of the iron sheet 213 is sleeved with the inner wall of the piston 210. The outer wall of the piston 210 is sleeved with an upper cover 3. The upper cover 3 abuts against the iron sheet 213. When the iron sheet 213 and the upper cover 3 are in a flat state, it indicates that the pressure relief valve has no gas leakage.

[0027] The bottom of the body 206 is fixedly connected with a spiral exhaust duct 214. The inner wall of the spiral exhaust duct 214 is fixedly connected with a grid 215. The spiral exhaust duct 214 is arranged inside the battery pack. The inside of the spiral exhaust duct 214 is arranged in a spiral shape. The spiral structure of the exhaust passage can generate centrifugal force on the airflow. The combustible phosphorus carbon particles in the gas will be separated under the action of centrifugal force and adhere to the pipe wall.

[0028] When the battery pack appears, such as overcharge, over-discharge, short circuit or thermal runaway, the internal gas accumulates rapidly, so that the internal pressure of the battery pack rises sharply, the gas enters the fire barrier assembly 2 from the inlet of the spiral exhaust duct 214 located inside the battery pack, then the airflow pushes the piston 210 to move upward, and then releases the airflow to the outside environment, realizes the pressure reduction of the battery pack, avoids the explosion of the battery pack due to excessive pressure, in the spiral exhaust duct 214, the spiral structure of the spiral exhaust duct 214 can make the gas flow produce centrifugal force, the combustible phosphorus carbon particles in the gas will produce separation effect under the action of centrifugal force and adhere to the pipe wall, so that the high-temperature gas after being discharged does not produce further combustion after contacting with the oxygen in the atmosphere, slows down the propagation of combustion, and can prevent or delay the flame spread speed after thermal runaway occurs.

[0029] The protruding grid 215 is arranged on the inner wall of the spiral exhaust duct 214, under the action of centrifugal force, the combustible phosphorus carbon particles will be thrown to the inner wall of the spiral exhaust duct 214, the high-pressure airflow will fluctuate between the grids 215, which reduces the flow rate of the gas, and then makes part of the phosphorus carbon particles fall on the inner wall of the grid 215, further blocking the combustible particles from being discharged to produce further combustion effect.

[0030] In addition, the inner wall of the spiral exhaust duct 214 is provided with micropores 4, the number of the micropores 4 is arranged in several groups, and the several groups of micropores 4 are arranged at equal intervals on the inner wall of the spiral exhaust duct 214, when the air flows through the spiral exhaust duct 214, the combustible particles will contact with the wall surface of the micropores 4, since the particles usually have small particle size, under the action of van der Waals force, they are easily adsorbed and retained by the wall surface of the micropores 4, thereby reducing the further diffusion of the particles, further blocking the combustible particles from being discharged to produce further combustion effect.

[0031] In the utility model, when the battery pack appears such as overcharge, overdischarge, short circuit or thermal runaway, internal gas rapidly accumulates, thereby making the internal pressure of the battery pack sharply rise, the gas enters into the fire blocking assembly 2 from the entrance of the spiral air exhaust duct 214 located in the internal part of the battery pack, then the gas flow pushes the piston 210 to move upward, thereby releasing the gas flow to the external environment, realizing the pressure reduction of the battery pack, avoiding the explosion of the battery pack due to the excessively large pressure, in the spiral air exhaust duct 214, the spiral structure of the spiral air exhaust duct 214 can make the gas flow generate centrifugal force, the combustible phosphorus carbon particles in the gas can generate separation effect under the action of the centrifugal force and adhere to the pipe wall, so that the high-temperature gas after being discharged does not generate further combustion after contacting with the oxygen in the atmosphere, the combustion propagation is slowed down, the flame spreading speed after the thermal runaway occurs can be prevented or delayed, the protruding grid 215 is arranged on the inner wall of the spiral air exhaust duct 214, under the action of the centrifugal force, the combustible phosphorus carbon particles can be thrown to the inner wall of the spiral air exhaust duct 214, the high-pressure gas flow constantly fluctuates between the grids 215, the flow rate of the gas is reduced, thereby making part of the phosphorus carbon particles fall on the inner wall of the grid 215, further blocking the combustible particulate matter from being discharged to generate further combustion effect.

[0032] The foregoing has described the utility model in detail, but some modifications or improvements can be made on the basis of the utility model, which is obvious to the general technical personnel in the technical field. Therefore, the modifications or improvements without departing from the spirit of the utility model are within the protection scope of the utility model.

Claims

1. A screw flame arrest explosion relief valve comprising a housing (1), characterized in that: The bottom of the shell (1) is provided with a through hole, and the end face of the shell (1) is provided with a fire stopping assembly (2), the fire stopping assembly (2) comprises: Spring (201), the spring (201) is sleeved on the outer wall of the guide rod (202), the guide rod (202) is fixedly connected with the body (206), the inner wall of the body (206) is sleeved with the magnet (208), the top end of the magnet (208) is provided with an iron sleeve (209); Piston (210), the piston (210) is threadedly connected with the iron sleeve (209), the top of the piston (210) is fixedly connected with a breathable membrane (211), the top of the breathable membrane (211) is provided with a compression ring (212), the top of the compression ring (212) is provided with an iron sheet (213); Spiral exhaust duct (214), the bottom of the body (206) is fixedly connected with a spiral exhaust duct (214), the inner wall of the spiral exhaust duct (214) is fixedly connected with a grid (215).

2. A flame arrestant explosion relief pressure relief valve according to claim 1, characterized in that: The body (206) is fixedly connected with the battery pack by screws, the shell (1) is fixedly connected at the bottom end of the body (206), and the shell (1) is sleeved with the spring (201).

3. A flame arrestant explosion relief pressure relief valve according to claim 1, characterized in that: The bottom end face of the body (206) is sleeved with an outer sealing ring (203), the outer sealing ring (203) abuts against the outer wall of the battery pack, the top end face of the body (206) is sleeved with an inner sealing ring (207), and the inner sealing ring (207) is sleeved with the piston (210).

4. A flame arrestant explosion relief pressure relief valve according to claim 1, characterized in that: The shell (1) is provided with a clamping spring (204), the outer wall of the shell (1) is sleeved with a clamping ring compression ring (205), and the clamping spring (204) abuts against the clamping ring compression ring (205).

5. A flame arrestant explosion relief pressure relief valve according to claim 1, characterized in that: The compression ring (212) is sleeved with the inner wall of the piston (210), the outer wall of the iron sheet (213) is sleeved with the inner wall of the piston (210), the outer wall of the piston (210) is sleeved with an upper cover (3), and the upper cover (3) abuts against the iron sheet (213).

6. A flame arrestant explosion relief pressure relief valve according to claim 1, characterized in that: The spiral exhaust duct (214) is arranged in the battery pack, and the inside of the spiral exhaust duct (214) is arranged in a snail shape.

7. A flame arrestant explosion relief pressure relief valve according to claim 1, characterized in that: The inner wall of the spiral exhaust duct (214) is provided with a plurality of groups of micropores (4), and the plurality of groups of micropores (4) are arranged at equal intervals on the inner wall of the spiral exhaust duct (214).

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