Explosion-proof pressure relief device for power battery pack

Abstract

The invention discloses a power battery pack anti-explosion pressure relief device, and belongs to the technical field of power battery equipment, the power battery pack anti-explosion pressure relief device comprises a fixing assembly, the fixing assembly comprises a lower fixing bag, the upper side wall of the lower fixing bag is fixedly connected with an upper fixing bag, two partition plates are fixedly connected in the lower fixing bag, and a plurality of cooling assemblies are arranged in the lower fixing bag; and the cooling assembly comprises a battery unit, an anti-explosion valve is engraved at the upper end of the battery unit, a water storage box is fixedly connected to the side wall of the battery unit, a waterproof film is fixedly connected to the interior of the water storage box, and a vertical pipe is fixedly connected to the upper side wall of the battery unit. The pressure of the gases is utilized to enable the gas valve assembly to release a large amount of carbon dioxide, and the carbon dioxide is mixed with the gases sprayed by the battery, so that the gases sprayed by the battery are effectively diluted, the concentrations of combustible gases and toxic gases are reduced, and the inflammability and toxicity of the gases are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power battery equipment, and in particular to an explosion-proof pressure relief device for a power battery pack. Background Art

[0002] A power battery pack is a battery pack used in electric vehicles and other electric drive systems. It is mainly composed of multiple battery cells that can store and release electrical energy to power the electric motor. The battery pack must not only meet the requirements of high power and high energy density, but also have good thermal management and safety. With the popularity of electric vehicles, the design and technology of power battery packs are also constantly developing to improve driving range and charging efficiency while reducing costs.

[0003] A Chinese patent discloses a highly safe explosion-proof battery pack (authorization announcement number CN116885382B). When a battery fails and a large amount of gas is generated inside, the device can not only achieve the exhaust function, but also reduce the probability of the exhausted gas causing damage to nearby batteries to a certain extent, compared with the traditional explosion-proof valve exhaust method. In combination with the exhaust structure, the leakage of water in the water-gas separation cylinder can be reduced to a certain extent. In addition, in the water-gas separation cylinder, due to the entry of gas, when the water generates a vortex and the water temperature rises, the water pipe and water pump can be used to circulate and clean the water inside the water-gas separation cylinder, thereby further improving the heat dissipation effect of the water. After the separated gas is discharged through the exhaust pipe, part of the gas filtered by the filter is discharged from the warning whistle to achieve the purpose of warning, informing nearby personnel to stay away from the battery pack as soon as possible.

[0004] When the battery is out of control, a large amount of gas will accumulate inside. The current treatment method is to release these gases through the pressure relief valve when the internal pressure of the battery is too high to achieve the effect of pressure relief and explosion prevention. However, these released gases are mainly flammable gases such as hydrogen and methane and some toxic gases. Due to the poor ventilation performance inside the existing battery pack, the concentration of the gas increases after it is released because it cannot diffuse quickly. If it encounters sparks in this process, the gas will be instantly ignited, which may cause a fire and bring greater safety hazards. The above-mentioned patent releases the gas directly into the water, which will still cause the released gas to rise and discharge from the water surface in the form of bubbles, causing the gas to still be released and gathered. In this way, the problems of flammability and toxicity still exist. Therefore, this method does not effectively solve the safety hazards. In order to alleviate the above phenomenon, we propose an explosion-proof pressure relief device for a power battery pack. Summary of the invention

[0005] The object of the present invention is to provide an explosion-proof pressure relief device for a power battery pack to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A power battery pack explosion-proof pressure relief device, comprising a fixing assembly, characterized in that the fixing assembly comprises a lower fixing assembly, the upper fixing assembly is fixedly connected to the upper side wall of the lower fixing assembly, two partitions are fixedly connected inside the lower fixing assembly, and a plurality of cooling assemblies are arranged inside the lower fixing assembly;

[0008] The cooling assembly includes a battery unit, an explosion-proof valve is engraved on the upper end of the battery unit, a water storage box is fixedly connected to the side wall of the battery unit, a water-isolating membrane is fixedly connected inside the water storage box, a vertical pipe is fixedly connected to the upper side wall of the battery unit, a shift plug is slidably connected inside the vertical pipe, a plurality of vertical pipes are fixedly connected to the same gas mixing assembly, and a plurality of vertical pipes all penetrate the gas mixing assembly and are fixedly connected to a gas valve assembly;

[0009] The air valve assembly includes a transmission water box connected to the upper ends of multiple vertical pipes, two air storage tanks are fixedly connected to the upper side wall of the gas mixing assembly, air pipes are connected between the two ends of the two air storage tanks, a connecting pipe is connected between the two air pipes, a valve shell is connected in the middle of the connecting pipe, a valve core is rotatably connected inside the valve shell, a cross-shaped cavity is drilled on the valve core, and one-way valves are fixedly connected to the front and rear ends of the cross-shaped cavity, jet pipes are connected between the left and right side walls of the valve shell and the transmission water box, and a transmission assembly is fixedly connected between the displacement plug and the valve core.

[0010] As a further solution of the present invention, the transmission assembly includes a transmission tube connected to the upper side wall of the battery unit, and a transmission plug is slidably connected inside the transmission tube.

[0011] As a further solution of the present invention, a square telescopic rod is fixedly connected to the lower side wall of the valve core, and the square telescopic rod is rotatably connected to the valve housing, and the transmission plug is rotatably connected to the square telescopic rod.

[0012] As a further solution of the present invention, a sliding groove is cut on the inner wall of the transmission tube, a sliding rod is slidably connected inside the sliding groove, and the sliding rod is fixedly connected to the square telescopic rod.

[0013] As a further solution of the present invention, the cooling assembly also includes a water cylinder fixedly connected to the vertical pipe, and two water pipes are connected between the water cylinder and the water storage box.

[0014] As a further solution of the present invention, an annular plug is slidably connected between the vertical pipe and the water cylinder, a return spring is fixedly connected between the annular plug and the battery unit, and a plurality of evenly distributed exhaust holes are drilled on the vertical pipe.

[0015] As a further solution of the present invention, two nozzles are fixedly connected to the side wall of the vertical pipe, the two nozzles are connected to the water cylinder, and the upper ends of the two nozzles pass through the vertical pipe and are connected to the nozzles.

[0016] As a further solution of the present invention, a T-shaped rod is fixedly connected to the lower end of the displacement plug, and an insert sleeve is inserted into the lower ends of the two nozzles, and the T-shaped rod is fixedly connected to the insert sleeve.

[0017] As a further solution of the present invention, the gas mixing assembly includes a gas box, an inner diverter plate and an outer diverter plate are fixedly connected between the upper and lower inner walls of the gas box, the left and right side walls of the inner diverter plate are both provided with a first gas outlet, and the front and rear side walls of the outer diverter plate are both provided with a second gas outlet.

[0018] As a further solution of the present invention, the left and right side walls of the gas box are both connected with a plurality of evenly distributed exhaust pipes, and the exhaust pipes are arranged through the upper fixing package.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. When the present invention is used, through the gas valve assembly and the transmission assembly, when the battery releases a large amount of gas, the pressure of these gases can be used to make the gas valve assembly release a large amount of carbon dioxide, and mix it with the gas ejected from the battery. This process effectively dilutes the gas ejected from the battery, reduces the concentration of combustible gas and toxic gas, and thus reduces its flammability and toxicity.

[0021] 2. When the present invention is used, the gas mixing assembly is arranged to ensure that the carbon dioxide released by the gas valve assembly and the gas ejected by the battery can pass through the inner diverter plate and the first gas outlet to achieve rapid mixing, thereby further reducing the concentration of combustible gas and toxic gas released by the battery.

[0022] 3. When the present invention is used, the gas released by the battery is sprayed through the cooling assembly, which not only effectively reduces the temperature of the gas, but also utilizes the gas to quickly diffuse the sprayed water mist, thereby increasing the humidity of the surrounding environment. This process significantly reduces the risk of fire and the possibility of gas combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional stereogram of an explosion-proof pressure relief device for a power battery pack;

[0024] Figure 2 It is a structural schematic diagram of a fixed component in an explosion-proof pressure relief device for a power battery pack;

[0025] Figure 3 It is a schematic diagram of the structure of a cooling component part in an explosion-proof pressure relief device for a power battery pack;

[0026] Figure 4 It is a structural schematic diagram of a cooling component in an explosion-proof pressure relief device for a power battery pack;

[0027] Figure 5This is an exploded view of a cooling component in an explosion-proof pressure relief device for a power battery pack;

[0028] Figure 6 for Figure 5 The enlarged view of point A in the middle;

[0029] Figure 7 It is a structural schematic diagram of a gas mixing component in an explosion-proof pressure relief device for a power battery pack;

[0030] Figure 8 It is a structural schematic diagram of a gas valve assembly in an explosion-proof pressure relief device for a power battery pack;

[0031] Fig. 9 for Figure 8 The enlarged view of point B in the middle;

[0032] Fig.10 The figure is a diagram of the airflow trajectory inside the gas mixing component in an explosion-proof pressure relief device for a power battery pack.

[0033] In the figure:

[0034] 1. Fixing assembly; 101. Lower fixing bag; 102. Upper fixing bag; 103. Partition plate;

[0035] 2. Cooling assembly; 201. Battery unit; 202. Explosion-proof valve; 203. Water storage box; 204. Water-proof membrane; 205. Vertical pipe; 206. Water cylinder; 207. Water pipe; 208. Annular plug; 209. Return spring; 210. Exhaust hole; 211. Plug transfer; 212. Spray pipe; 213. Spray head; 214. T-bar; 215. Insertion tube;

[0036] 3. Gas mixing assembly; 301. Gas box; 302. Inner splitter plate; 303. First gas outlet; 304. Outer splitter plate; 305. Second gas outlet; 306. Exhaust pipe;

[0037] 4. Air valve assembly; 401. Transmission water box; 402. Air storage tank; 403. Air pipe; 404. Connecting pipe; 405. Valve housing; 406. Valve core; 407. Cross cavity; 408. Check valve; 409. Jet pipe;

[0038] 5. Transmission assembly; 501. Transmission tube; 502. Transmission plug; 503. Square telescopic rod; 504. Slide groove; 505. Slide rod. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Example 1: Please refer to Figures 1 to 3 In an embodiment of the present invention, an explosion-proof pressure relief device for a power battery pack includes a fixing assembly 1, the fixing assembly 1 includes a lower fixing pack 101, an upper fixing pack 102 is fixedly connected to the upper side wall of the lower fixing pack 101, two partitions 103 are fixedly connected inside the lower fixing pack 101, and a plurality of cooling assemblies 2 are arranged inside the lower fixing pack 101;

[0041] The cooling assembly 2 includes a battery cell 201, and an explosion-proof valve 202 is engraved on the upper end of the battery cell 201. When the pressure inside the battery cell 201 is too high, the explosion-proof valve 202 is forced to open under pressure, thereby relieving pressure. The structure and principle of the explosion-proof valve 202 are both existing technologies and are not repeated here. A water storage box 203 is fixedly connected to the side wall of the battery cell 201, and a water-isolating membrane 204 is fixedly connected inside the water storage box 203. A vertical pipe 205 is fixedly connected to the upper side wall of the battery cell 201, and a displacement plug 211 is slidably connected inside the vertical pipe 205. The same gas mixing assembly 3 is fixedly connected to multiple vertical pipes 205, and multiple vertical pipes 205 all penetrate the gas mixing assembly 3 and are fixedly connected to a gas valve assembly 4.

[0042] See also Figures 7 to 10The air valve assembly 4 includes a transmission water box 401 connected to the upper ends of multiple vertical pipes 205, and the transmission water box 401 is filled with hydraulic oil. Two air storage tanks 402 are fixedly connected to the upper side wall of the gas mixing assembly 3. Air pipes 403 are connected between the two ends of the two air storage tanks 402. A connecting pipe 404 is connected between the two air pipes 403. The middle of the connecting pipe 404 is connected to a valve shell 405. A valve core 406 is rotatably connected inside the valve shell 405. A cross-shaped cavity 407 is excavated on the valve core 406. In the initial state, the valve core 406 is connected to the injection pipe 409 through the excavated cross-shaped cavity 407. Due to the existence of the one-way valve 408, the compressed gas in the connecting pipe 404 cannot be released through the cross-shaped cavity 407. The front and rear ends of the cross-shaped cavity 407 are fixedly connected. One-way valve 408, the left and right side walls of the valve shell 405 are connected to the transmission water box 401 with a jet pipe 409, and a transmission component 5 is fixedly connected between the shift plug 211 and the valve core 406. When the air pressure inside the battery unit 201 reaches the limit that the explosion-proof valve 202 can withstand, the explosion-proof valve 202 will rupture first. At this time, the gas inside the battery unit 201 is quickly ejected from the explosion-proof valve 202, and then the shift plug 211 is pushed up. When the shift plug 211 moves up, the pressure inside the transmission water box 401 is increased, and then the valve core 406 is driven to rotate 90 degrees through the transmission component 5. At this time, the inside of the valve core 406 is connected with the connecting pipe 404 through the cross-shaped cavity 407. At this time, the gas inside the gas storage tank 402 is quickly discharged into the gas box 301 through the cross-shaped cavity 407 and the jet pipe 409.

[0043] It is worth noting that one end of the jet pipe 409 is connected to the top of the first gas outlet 303 , so when any battery cell 201 releases gas, it will pass through the first gas outlet 303 , so that the gas can be better mixed with the gas released by the gas storage tank 402 .

[0044] The transmission assembly 5 includes a transmission tube 501 connected to the upper side wall of the battery unit 201, a transmission plug 502 is slidably connected inside the transmission tube 501, a square telescopic rod 503 is fixedly connected to the lower side wall of the valve core 406, and the square telescopic rod 503 is rotatably connected to the valve housing 405, the transmission plug 502 is rotatably connected to the square telescopic rod 503, a slide groove 504 is opened on the inner side wall of the transmission tube 501, a slide rod 505 is slidably connected inside the slide groove 504, and the slide rod 505 is fixedly connected to the square telescopic rod 503. When the pressure inside the transmission water box 401 increases, the oil pressure inside the transmission water box 401 will drive the transmission plug 502 to move up, the transmission plug 502 drives the square telescopic rod 503 to contract, and then the slide rod 505 is guided by the slide groove 504 to drive the square telescopic rod 503 to rotate 90 degrees, and at the same time, the square telescopic rod 503 will also drive the valve core 406 to rotate 90 degrees, so as to realize the release of gas from the air valve assembly 4.

[0045] Example 2: Please refer to Figures 4 to 6 Based on Example 1, the cooling assembly 2 further includes a water cylinder 206 fixedly connected to the vertical pipe 205, two water pipes 207 are connected between the water cylinder 206 and the water storage box 203, an annular plug 208 is slidably connected between the vertical pipe 205 and the water cylinder 206, a return spring 209 is fixedly connected between the annular plug 208 and the battery unit 201, a plurality of evenly distributed exhaust holes 210 are drilled on the vertical pipe 205, and two nozzles 212 are fixedly connected to the side wall of the vertical pipe 205, the two nozzles 212 are both connected to the water cylinder 206, and the upper ends of the two nozzles 212 penetrate the vertical pipe 205. The nozzle 213 is connected, and the lower end of the displacement plug 211 is fixedly connected to a T-shaped rod 214. The lower ends of the two nozzles 212 are plugged with an insert 215. Under normal circumstances, the insert 215 is inserted into the lower end of the nozzle 212, so that the nozzle 212 is not connected to the water cylinder 206. A through hole is drilled on the insert 215. When the insert 215 moves up and the through hole corresponds to the connection point between the nozzle 212 and the water cylinder 206, the nozzle 212 will be connected to the water cylinder 206, and the T-shaped rod 214 is fixedly connected to the insert 215. When the battery unit 201 loses control due to a short circuit or other special circumstances, the battery unit 201 A large amount of gas is generated inside due to the chemical reaction of the battery materials. These gases cause the shell of the battery cell 201 to gradually expand and deform, so that the battery cell 201 can squeeze the waterproof membrane 204, so that the water inside the vertical pipe 205 is discharged into the water cylinder 206 through the water pipe 207. At the same time, under the action of water pressure, the annular plug 208 will move downward. When the air pressure inside the battery cell 201 reaches the limit that the explosion-proof valve 202 can withstand, the explosion-proof valve 202 will rupture first. At this time, the gas inside the battery cell 201 will quickly spray out from the explosion-proof valve 202, and then push the displacement plug 211 upward, and finally pass through Multiple exhaust holes 210 are released into the gas mixing assembly 3. During the upward movement of the displacement plug 211, the displacement plug 211 pulls the insert 215 through the T-bar 214 to insert into the nozzle 212, so that the nozzle 212 is connected with the water cylinder 206. At this time, the annular plug 208 will be reset under the thrust of the reset spring 209, so that the water inside the water cylinder 206 is sprayed in the form of mist through the nozzle 212 and the nozzle 213 toward the gas released by the battery, which effectively cools the gas released by the battery. At the same time, the impact force of the gas released by the battery will cause the water mist to spread rapidly, thereby increasing the humidity of the surrounding air.

[0046] The gas mixing assembly 3 includes a gas box 301, and an inner diverter plate 302 and an outer diverter plate 304 are fixedly connected between the upper and lower inner walls of the gas box 301. The left and right side walls of the inner diverter plate 302 are both provided with a first gas outlet 303, and the front and rear side walls of the outer diverter plate 304 are both provided with a second gas outlet 305. The left and right side walls of the gas box 301 are both connected with a plurality of evenly distributed exhaust pipes 306, and the exhaust pipes 306 are arranged through the upper fixed package 102. When the gas generated by the battery is released into the gas box 301 through the exhaust hole 210, the gas will first be discharged through the first gas outlet 303 and mixed with the gas released by the gas valve assembly 4. The gas released by the gas valve assembly 4 is carbon dioxide, which has an effective flame retardant effect. The mixed gas will pass through the second gas outlet 305 again and finally be discharged through the exhaust pipe 306. The flammability and toxicity of the gas finally discharged will be greatly reduced, becoming non-flammable, and the toxicity will also be greatly reduced.

[0047] The working principle of the present invention is:

[0048] In the present invention, when the internal pressure of the battery cell 201 increases due to loss of control, the outer shell of the battery cell 201 expands due to the pressure first, and then squeezes the water-isolating membrane 204, so that the water inside the vertical pipe 205 is discharged into the water cylinder 206 through the water pipe 207. At the same time, under the action of the water pressure, the annular plug 208 moves downward. When the air pressure inside the battery cell 201 reaches the limit that the explosion-proof valve 202 can withstand, the explosion-proof valve 202 will rupture first. At this time, the gas inside the battery cell 201 is quickly ejected from the explosion-proof valve 202, and then the displacement plug 211 is moved upward, and finally released to the outside through the multiple exhaust holes 210. In the gas mixing assembly 3, during the upward movement of the displacement plug 211, the displacement plug 211 pulls the insert 215 through the T-bar 214 to insert into the nozzle 212, so that the nozzle 212 is connected with the water cylinder 206. At this time, the annular plug 208 is reset under the thrust of the reset spring 209, so that the water inside the water cylinder 206 is sprayed in the form of mist through the nozzle 212 and the nozzle 213 toward the gas released by the battery, which effectively cools the gas released by the battery. At the same time, the impact force of the gas released by the battery causes the water mist to spread rapidly, thereby increasing the humidity of the surrounding air, reducing the probability of the appearance of sparks in the surrounding area, and avoiding the combustion of the gas.

[0049] When the displacement plug 211 moves upward, the pressure inside the transmission water box 401 increases, and the oil pressure inside the transmission water box 401 will drive the transmission plug 502 to move upward. The transmission plug 502 drives the square telescopic rod 503 to contract, and then the slide rod 505 is guided by the slide groove 504 to drive the square telescopic rod 503 to rotate 90 degrees. At the same time, the square telescopic rod 503 will also drive the valve core 406 to rotate 90 degrees. At this time, the inside of the valve core 406 is connected with the connecting pipe 404 through the cross cavity 407. At this time, the carbon dioxide inside the gas storage tank 402 is quickly discharged into the gas box 301 through the cross cavity 407 and the jet pipe 409, so that the carbon dioxide is quickly mixed with the gas released by the battery cell 201. The mixed gas will pass through the first gas outlet 303 and the second gas outlet 305 again to make them mix more evenly. Finally, the gas is discharged through the exhaust pipe 306. Since the discharged gas is diluted by a large amount of carbon dioxide, their flammability and toxicity will be greatly reduced at this time, thereby effectively improving the explosion-proof effect of the battery pack.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An explosion-proof pressure relief device for a power battery pack, comprising a fixing assembly (1), characterized in that: The fixing assembly (1) comprises a lower fixing bag (101), an upper fixing bag (102) being fixedly connected to an upper side wall of the lower fixing bag (101), two partitions (103) being fixedly connected inside the lower fixing bag (101), and a plurality of cooling assemblies (2) being arranged inside the lower fixing bag (101); The cooling assembly (2) comprises a battery unit (201), an explosion-proof valve (202) is engraved on the upper end of the battery unit (201), a water storage box (203) is fixedly connected to the side wall of the battery unit (201), a water-isolating membrane (204) is fixedly connected inside the water storage box (203), a vertical pipe (205) is fixedly connected to the upper side wall of the battery unit (201), a displacement plug (211) is slidably connected inside the vertical pipe (205), a plurality of vertical pipes (205) are fixedly connected to the same gas mixing assembly (3), and a plurality of vertical pipes (205) all penetrate the gas mixing assembly (3) and are fixedly connected to a gas valve assembly (4); The gas valve assembly (4) comprises a transmission water box (401) connected to the upper ends of the plurality of vertical pipes (205); two gas storage tanks (402) are fixedly connected to the upper side wall of the gas mixing assembly (3); an air pipe (403) is connected between the two ends of the two gas storage tanks (402); a connecting pipe (404) is connected between the two air pipes (403); a valve housing (405) is connected in the middle of the connecting pipe (404); a valve core (406) is rotatably connected inside the valve housing (405); a cross-shaped cavity (407) is bored on the valve core (406); a check valve (408) is fixedly connected to the front and rear ends of the cross-shaped cavity (407); an air jet pipe (409) is connected between the left and right side walls of the valve housing (405) and the transmission water box (401); and a transmission assembly (5) is fixedly connected between the displacement plug (211) and the valve core (406).

2. The explosion-proof pressure relief device for a power battery pack according to claim 1, characterized in that: The transmission assembly (5) comprises a transmission tube (501) connected to the upper side wall of the battery unit (201), and a transmission plug (502) is slidably connected inside the transmission tube (501).

3. The explosion-proof pressure relief device for a power battery pack according to claim 2, characterized in that: A square telescopic rod (503) is fixedly connected to the lower side wall of the valve core (406), and the square telescopic rod (503) is rotatably connected to the valve housing (405), and the transmission plug (502) is rotatably connected to the square telescopic rod (503).

4. The explosion-proof pressure relief device for a power battery pack according to claim 3, characterized in that: A sliding groove (504) is cut on the inner wall of the transmission tube (501), a sliding rod (505) is slidably connected inside the sliding groove (504), and the sliding rod (505) is fixedly connected to the square telescopic rod (503).

5. The explosion-proof pressure relief device for a power battery pack according to claim 1, characterized in that: The cooling assembly (2) further comprises a water cylinder (206) fixedly connected to the vertical pipe (205), and two water pipes (207) are connected between the water cylinder (206) and the water storage box (203).

6. The explosion-proof pressure relief device for a power battery pack according to claim 5, characterized in that: An annular plug (208) is slidably connected between the vertical pipe (205) and the water cylinder (206), a return spring (209) is fixedly connected between the annular plug (208) and the battery unit (201), and a plurality of evenly distributed exhaust holes (210) are drilled on the vertical pipe (205).

7. The explosion-proof pressure relief device for a power battery pack according to claim 6, characterized in that: Two spray pipes (212) are fixedly connected to the side wall of the vertical pipe (205), and the two spray pipes (212) are both connected to the water cylinder (206). The upper ends of the two spray pipes (212) penetrate the vertical pipe (205) and are connected to a spray head (213).

8. The explosion-proof pressure relief device for a power battery pack according to claim 7, characterized in that: The lower end of the displacement plug (211) is fixedly connected to a T-shaped rod (214), the lower ends of the two nozzles (212) are both plugged with an insert tube (215), and the T-shaped rod (214) and the insert tube (215) are fixedly connected.

9. The explosion-proof pressure relief device for a power battery pack according to claim 1, characterized in that: The gas mixing assembly (3) comprises a gas box (301), an inner flow dividing plate (302) and an outer flow dividing plate (304) are fixedly connected between the upper and lower inner walls of the gas box (301), the left and right side walls of the inner flow dividing plate (302) are both provided with a first gas outlet (303), and the front and rear side walls of the outer flow dividing plate (304) are both provided with a second gas outlet (305).

10. The explosion-proof pressure relief device for a power battery pack according to claim 9, characterized in that: The left and right side walls of the gas box (301) are both connected to a plurality of evenly distributed exhaust pipes (306), and the exhaust pipes (306) are arranged through the upper fixing bag (102).

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