Flame-retardant explosion-proof device for lithium battery assembly

Abstract

The invention belongs to the technical field of lithium batteries, and particularly relates to a lithium battery assembly flame-retardant explosion-proof device which comprises a base. A second protective shell is fixedly connected to the top of the base. The side wall of the second protective shell is slidably connected with a first protective shell through a sliding rail. The middle of the base rotates and drives a first rotating shaft through a motor. A pair of clamping plates is mounted at the top of the first rotating shaft, and the clamping plates are adjusted through bolts and nuts; a lithium battery pack is arranged in the middle of the pair of clamping plates; through circular protection formed by the first protection shell and the second protection shell, the periphery can be protected in the testing process of the lithium battery pack, splashing of flames and fragments is reduced, the protection effect is provided for surrounding workers for data recording, and personal injury is reduced.

Description

Technical Field

[0001] This invention belongs to the field of lithium battery technology, specifically a flame-retardant and explosion-proof device for lithium battery components. Background Technology

[0002] Lithium-ion battery modules are a common type of power component in modern society. They mainly include battery cells, battery modules, battery management systems, and thermal management systems. Due to their advantages such as high energy density and long cycle life, lithium-ion battery modules are widely used in consumer electronics, electric vehicles, energy storage systems, and many other fields.

[0003] A patent application with publication number CN105609684A discloses a flame-retardant and explosion-proof device for lithium battery modules, including a casing and individual batteries. The casing includes a battery compartment and a buffer compartment, with a buffer airbag between the battery compartment and the buffer compartment. Multiple individual batteries connected in series are located within the battery compartment, which is filled with an insulating, thermally conductive liquid or flame-retardant adhesive, completely enveloping all individual batteries. The buffer compartment is filled with inert gas and buffer asbestos. A cooling and pressure relief valve is located at the top center of the casing. This invention has a simple structure and reasonable design. The faulty battery is surrounded by the thermally conductive liquid or flame-retardant adhesive, allowing for rapid cooling and preventing continuous combustion and explosion reactions caused by high temperatures, thus ensuring the safety of the entire battery system.

[0004] In the current environment, various tests are required in the testing of lithium battery components to confirm their stability in various environments. Among them, the bending test environment requires the lithium battery components to be bent and twisted to a certain extent. At this time, if the lithium battery components are damaged or short-circuited, they are prone to explosion and combustion, which can cause injury to workers by flames or flying fragments.

[0005] Therefore, the present invention provides a flame-retardant and explosion-proof device for lithium battery components. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: A flame-retardant and explosion-proof device for lithium battery components according to the present invention includes a base; a second protective shell is fixedly connected to the top of the base; a first protective shell is slidably connected to the side wall of the second protective shell via a slide rail; a first rotating shaft is driven by a motor to rotate in the middle of the base; a pair of clamping plates are installed on the top of the first rotating shaft, and the clamping plates are adjustable by bolts and nuts; a lithium battery pack is provided in the middle of the pair of clamping plates.

[0008] Preferably, the first and second protective shells are filled from the inside out with a titanium alloy layer, a composite material layer, a buffer layer, and an energy-absorbing layer, respectively. The titanium alloy layer is a 0.3mm thick titanium alloy honeycomb structure (honeycomb pore size 5-8mm), filled with carbon fiber chopped strand mat, and covered with a polytetrafluoroethylene (PTFE) wear-resistant coating. The composite material layer uses ultra-high molecular weight polyethylene (UHMWPE) fiber, pressed through a gradient lamination process of "low density-medium density-high density" (each layer thickness 0.2-0.5mm). The structure consists of 12-15 layers (0.5mm thick), with nano-sized alumina particles (50-100nm in diameter) added between the layers as a rigid reinforcing phase. The buffer layer is filled with a "flexible-rigid" dynamic response material formed by impregnating an ultra-thin glass fiber mesh with a shear-thickening fluid (based on polyethylene glycol with added nano-sized silica particles). The energy-absorbing layer is based on a flexible silicone aerogel (5-50nm pore size) and composited with 3D knitted memory foam fibers (polyether polyurethane) and bonded together with an elastic adhesive.

[0009] Preferably, the titanium alloy layer employs a titanium alloy honeycomb structure that disperses the instantaneous pressure generated by the explosion through "honeycomb collapse-deformation energy absorption" (which can reduce the peak pressure of the shock wave by more than 30%), thereby reducing direct fracture of the outer layer, and the titanium alloy density is 4.5 g / cm³. 3 The honeycomb structure is weight-reduced; the nano-alumina particles filling the gaps between the composite material layers enhance penetration resistance, while the friction between the particles further dissipates the residual energy of the blast shock wave; the overall thickness is controlled at 5-8 mm; when the buffer layer is impacted by an blast shock wave or high-speed fragments, the shear-thickening fluid instantly changes from liquid to solid (shear-thickening effect), absorbing more than 80% of the instantaneous impact force through intermolecular friction, thus delaying energy transfer; the energy-absorbing layer utilizes the porous structure of aerogel and the deformation recovery of memory foam to initially absorb the low-frequency vibration energy of the blast shock wave, and the aerogel density is 0.1-0.3 g / cm³. 3 This significantly reduces the overall weight.

[0010] Preferably, a support frame is fixedly connected to the top of the second protective shell; a storage box is fixedly connected to the top of the support frame; discharge ports are opened on both sides of the storage box; guide plates are fixedly connected to both sides of the storage box at positions corresponding to the discharge ports, and the bottom of the support frame is set towards the lithium battery pack; a temperature sensor is installed at the bottom of the support frame.

[0011] Preferably, the bottom of the base is threaded with a sand storage plate; the top of the base has multiple sets of sand discharge ports arranged in a circumferential array; multiple sets of sealing plates are rotatably connected around the first rotating shaft, and the width of the sealing plates is greater than the diameter of the sand discharge ports; triangular plates are fixedly connected to both sides of the top of the sealing plates.

[0012] Preferably, a first groove is formed in the middle of the multiple sets of triangular plates; a roller is rotatably provided at the bottom of the sealing plate; a limit plate is rotatably connected to both sides of the roller; the limit plate and the sealing plate are connected by a spring rod.

[0013] Preferably, a second sliding groove is formed at the top of the sealing plate between a pair of triangular plates; plastic films are fixed to both ends of the second sliding groove; a support rod is fixed to the lower middle part of the plastic film; multiple sets of protrusions are fixed to the surface of the roller; and the bottom of the support rod is in contact with the roller.

[0014] Preferably, a second rotating shaft is rotatably connected to the bottom of the storage box; a positioning rod is rotatably connected to the top of the second rotating shaft, and both ends of the positioning rod are fixed to the inner wall of the storage box; a stirring rod is fixed to the middle of the second rotating shaft.

[0015] Preferably, the end of the stirring rod is slidably connected to an extension plate via an elastic rope; a collision plate is rotatably connected to the lower middle part of the positioning rod; and multiple sets of through grooves are formed on the surfaces of both the extension plate and the collision plate.

[0016] Preferably, the bottom of the support rod is rotatably connected to a No. 3 rotating shaft; the No. 3 rotating shaft is in contact with the surface of the roller.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The lithium battery assembly flame-retardant and explosion-proof device of the present invention, through the circular protection composed of a first protective shell and a second protective shell, can protect the surroundings during the testing of the lithium battery assembly, reduce the splashing of flames and fragments, and thus provide protection for the personnel recording data around the perimeter, reducing personnel injury.

[0019] 2. The lithium battery assembly flame-retardant and explosion-proof device of the present invention utilizes the presence of fine sand inside the storage box to expel the fire in case of fire, cover the lithium battery pack, and fill the interior of the first and second protective shells, thus preventing air from entering and reducing the impact force of fragments, thereby increasing the personal safety of workers. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a perspective view of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the first and second protective shells in this invention;

[0024] Figure 4This is a schematic diagram of the base structure in this invention;

[0025] Figure 5 This is a schematic diagram of the sealing plate in this invention;

[0026] Figure 6 This is a schematic diagram of the storage box in this invention.

[0027] In the diagram: 1. Protective shell No. 1; 11. Protective shell No. 2; 12. Lithium battery pack; 13. Clamping plate; 14. Base; 15. Rotating shaft No. 1; 2. Titanium alloy layer; 21. Composite material layer; 22. Buffer layer; 23. Energy absorption layer; 3. Support frame; 31. Storage box; 32. Discharge port; 33. Guide plate; 4. Sand discharge port; 41. Sealing plate; 42. Sand storage plate; 43. Triangular plate; 5. Slide No. 1; 51. Roller; 52. Limiting plate; 6. Slide No. 2; 61. Support rod; 62. Plastic film; 63. Protrusion; 7. Rotating shaft No. 2; 71. Positioning rod; 72. Stirring rod; 8. Extension plate; 81. Collision plate; 9. Rotating shaft No. 3. Detailed Implementation

[0028] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0029] like Figures 1 to 2 As shown in the embodiment of the present invention, a flame-retardant and explosion-proof device for a lithium battery assembly includes a base 14; a second protective shell 11 is fixedly connected to the top of the base 14; a first protective shell 1 is slidably connected to the side wall of the second protective shell 11 via a slide rail; a first rotating shaft 15 is driven by a motor to rotate the middle of the base 14; a pair of clamping plates 13 are installed on the top of the first rotating shaft 15, and the clamping plates 13 are adjustable by bolts and nuts; a lithium battery pack 12 is disposed in the middle of the pair of clamping plates 13; during the bending test of the lithium battery pack 12 by the operator, the lithium battery pack 12 can be installed on the pair of clamping plates 13. Between the clamping plates 13, the appropriate width is adjusted by rotating the nuts. Then, the staff can move the first protective shell 1 so that the first protective shell 1 and the second protective shell 11 form a complete circle to protect the lithium battery pack 12 from all sides. In the event of a deflagration of the lithium battery pack 12, it can block the flames and flying debris. The circular protection formed by the first protective shell 1 and the second protective shell 11 can protect the lithium battery pack 12 from all sides during testing, reduce the flying of flames and debris, and thus provide protection for the staff who are recording data from all sides, reducing personnel injury.

[0030] like Figures 1 to 3As shown, the interiors of the No. 1 protective shell 1 and the No. 2 protective shell 11 are respectively filled from the inside out with a titanium alloy layer 2, a composite material layer 21, a buffer layer 22, and an energy-absorbing layer 23; the titanium alloy layer 2 is a 0.3mm thick titanium alloy honeycomb structure (honeycomb pore size 5-8mm), filled with carbon fiber chopped strand mat, and covered with a polytetrafluoroethylene (PTFE) wear-resistant coating; the composite material layer 21 is made of ultra-high molecular weight polyethylene (UHMWPE) fiber, pressed through a gradient lamination process of "low density-medium density-high density" (each layer thickness 0. The buffer layer 22 consists of 12-15 layers (0.2-0.5 mm thick), with nano-sized alumina particles (50-100 nm in diameter) added between the layers as a rigid reinforcing phase. The buffer layer 22 is filled with a "flexible-rigid" dynamic response material formed by impregnating an ultra-thin glass fiber mesh with a shear-thickening fluid (based on polyethylene glycol with added nano-sized silica particles). The energy-absorbing layer 23 is based on a flexible silicone aerogel (5-50 nm in pore size) and is composited with 3D knitted memory foam fibers (polyether polyurethane) and bonded together with an elastic adhesive.

[0031] like Figure 3 As shown, the titanium alloy honeycomb structure used in the aforementioned titanium alloy layer 2 disperses the instantaneous pressure generated by the explosion through "honeycomb collapse-deformation energy absorption" (which can reduce the peak pressure of the shock wave by more than 30%), thereby reducing direct fracture of the outer layer. Furthermore, the titanium alloy has a density of 4.5 g / cm³. 3 The honeycomb structure is weight-reduced; the nano-alumina particles filling the gaps between layers of the composite material layer 21 enhance penetration resistance, while the friction between particles further dissipates the residual energy of the blast shock wave; the overall thickness is controlled at 5-8 mm; when the buffer layer 22 is impacted by an blast shock wave or high-speed fragments, the shear-thickening fluid instantly changes from liquid to solid (shear-thickening effect), absorbing more than 80% of the instantaneous impact force through intermolecular friction, thus delaying energy transfer; the energy-absorbing layer 23 utilizes the porous structure of aerogel and the deformation recovery of memory foam to initially absorb the low-frequency vibration energy of the blast shock wave, and the aerogel density is 0.1-0.3 g / cm³. 3 This significantly reduces the overall weight.

[0032] like Figures 1 to 6As shown, a support frame 3 is fixed to the top of the second protective shell 11; a storage box 31 is fixed to the top of the support frame 3; discharge ports 32 are opened on both sides of the storage box 31; guide plates 33 are fixed to both sides of the storage box 31 at positions corresponding to the discharge ports 32, and the bottom of the support frame 3 faces the lithium battery pack 12; a temperature sensor is installed at the bottom of the support frame 3; during the testing of the lithium battery pack 12, fires caused by breakage or short circuits will be monitored by the temperature sensor. When the temperature exceeds the threshold, the discharge port 32 will open, and the fine sand inside the storage box 31 will move along the trajectory of the guide plate 33 through the discharge port 32. The bottom opening of the guide plate 33 faces the surface of the lithium battery pack 12, and the falling fine sand will quickly cover and wash the fire location on the surface of the lithium battery pack 12. The presence of fine sand inside the storage box 31 can discharge it when a fire occurs, covering the lithium battery pack 12, filling the interior of the first protective shell 1 and the second protective shell 11, preventing air from entering and reducing the impact force of fragments, thereby increasing the personal safety of the staff.

[0033] like Figures 1 to 5 As shown, the bottom of the base 14 is threaded with a sand storage plate 42; the top of the base 14 has multiple sets of sand discharge ports 4 arranged in a circumferential array; the first rotating shaft 15 is rotatably connected to multiple sets of sealing plates 41, and the width of the sealing plates 41 is greater than the diameter of the sand discharge ports 4; triangular plates 43 are fixed to both sides of the top of the sealing plates 41; after fine sand enters the first protective shell 1 and the second protective shell 11 inside the storage box 31 to bury the lithium battery pack 12, the workers can drive the sealing plates 41 to rotate, causing the multiple sets of sealing plates 41 to move, exposing the sand discharge ports 4, and then... The fine sand between the first protective shell 1 and the second protective shell 11 is discharged through the sand discharge port 4 and stored inside the sand storage plate 42 for subsequent unified processing. At the same time, during the movement of the sealing plate 41, a pair of triangular plates 43 installed on the top of the sealing plate 41 can guide the fine sand located on the top of the base 14 and assist it in entering the sand discharge port 4. Through the multiple sets of sand discharge ports 4 opened on the base 14, after the lithium battery pack 12 is stabilized, the fine sand can be discharged through the sand discharge port 4 by rotating the sealing plate 41, which makes it convenient for the staff to pick up and put down the lithium battery pack 12.

[0034] like Figure 5As shown, a first groove 5 is provided in the middle of the multiple sets of triangular plates 43; a roller 51 rotates at the bottom of the sealing plate 41; a limiting plate 52 is rotatably connected to both sides of the roller 51; the limiting plate 52 and the sealing plate 41 are connected by a spring rod; during the movement of the sealing plate 41, the roller 51 will rotate. At this time, some fine sand will remain on the surface of the base 14. The back-and-forth movement of the sealing plate 41 will gradually reduce it. At this time, the rolling of the roller 51 will come into contact with some fine sand. Under the uneven contact rolling, a vibration effect is generated, shaking the fine sand on the surface of the sealing plate 41. The rolling effect of the roller 51 can induce vibration, shaking the fine sand on the surface of the sealing plate 41 and the triangular plates 43, so that it falls smoothly and reduces adhesion, which may cause jamming during subsequent movement.

[0035] like Figure 5 As shown, a second groove 6 is provided at the top of the sealing plate 41 between a pair of triangular plates 43; plastic films 62 are fixed to both ends of the second groove 6; a support rod 61 is fixed to the lower middle part of the plastic film 62; multiple sets of protrusions 63 are fixed to the surface of the roller 51; the bottom of the support rod 61 is in contact with the roller 51; during the rolling process of the roller 51, the protrusions 63 will continuously contact the bottom of the support rod 61, and the protrusions of the protrusions 63 will drive the support rod 61 to move up and down. At the same time, the fine sand on the surface of the plastic film 62 that enters through the first groove 5 will be pushed by the support rod 61 and moved to both sides according to the undulation of the middle part of the plastic film 62 and discharged through the sand discharge port 4 into the sand storage plate 42 for subsequent processing. Through the movement effect of the sealing plate 41, the support rod 61 can be moved during the movement, creating an undulating effect in the middle part of the plastic film 62, thereby moving the fine sand to both sides, reducing the accumulation of fine sand on the top of the sealing plate 41, and reducing the need for manual cleaning by subsequent staff.

[0036] like Figure 6 As shown, a second rotating shaft 7 is rotatably connected to the bottom of the storage box 31; a positioning rod 71 is rotatably connected to the top of the second rotating shaft 7, and both ends of the positioning rod 71 are fixed to the inner wall of the storage box 31; a stirring rod 72 is fixed to the middle of the second rotating shaft 7; during the discharge of fine sand inside the storage box 31, as the second rotating shaft 7 rotates, the stirring rod 72 will rotate inside the storage box 31, causing the stirring rod 72 to stir the fine sand inside the storage box 31, and to tap the clumps in the fine sand to reduce the presence of clumps. Through the rotation effect of the second rotating shaft 7, the stirring rod 72 can be driven to stir the fine sand, so that some of the clumps of sand and gravel can be broken up and discharged smoothly, reducing the obstruction of the discharge process caused by clumps and affecting the coverage effect of the lithium battery pack 12.

[0037] like Figure 6As shown, the end of the stirring rod 72 is slidably connected to the extension plate 8 via an elastic rope; the lower part of the positioning rod 71 is rotatably connected to the collision plate 81; multiple sets of through grooves are opened on the surfaces of the extension plate 8 and the collision plate 81; during the rotation of the second rotating shaft 7, as the rotation speed increases, the extension plate 8 can be moved outward under the action of centrifugal force, so that the extension plate 8 and the collision plate 81 come into contact. When the extension plate 8 and the collision plate 81 collide, the through grooves opened on the extension plate 8 and the collision plate 81 can pick up some of the clumps of fine sand. When the two collide and come into contact, the clumps of fine sand are broken up. Through the contact and collision effect of the extension plate 8 and the collision plate 81, the clumping of fine sand inside the support frame 3 can be reduced, thereby reducing the jamming of fine sand during the discharge process and increasing the stability of fine sand discharge.

[0038] like Figure 5 As shown, the bottom of the support rod 61 is rotatably connected to a third rotating shaft 9; the third rotating shaft 9 is in contact with the surface of the roller 51; during the movement of the sealing plate 41, the rotation of the roller 51 will cause multiple sets of protrusions 63 to continuously contact the third rotating shaft 9. The rotation effect of the third rotating shaft 9 drives the support rod 61 to move, pushing the middle of the plastic film 62 to rise and fall. The rotation effect of the third rotating shaft 9 can reduce the jamming caused when the bottom of the support rod 61 contacts the surface of the roller 51.

[0039] Working principle: During the bending test of the lithium battery pack 12, the lithium battery pack 12 can be installed between a pair of clamping plates 13. The appropriate width can be adjusted by rotating the nut. Then, the operator can move the first protective shell 1 so that the first protective shell 1 and the second protective shell 11 form a complete circle to protect the lithium battery pack 12 from all sides. In the event of a deflagration of the lithium battery pack 12, it can block the flames and flying debris. During the test of the lithium battery pack 12, fires caused by breakage or short circuits will be monitored by the temperature sensor. When the temperature exceeds the threshold, the discharge port 32 will be opened. The fine sand inside the storage box 31 will move along the trajectory of the guide plate 33 through the discharge port 32. The bottom opening of the guide plate 33 faces the surface of the lithium battery pack 12. The falling fine sand will quickly cover and wash the fire position on the surface of the lithium battery pack 12.

[0040] After fine sand enters the storage box 31 and buries the lithium battery pack 12 inside the first protective shell 1 and the second protective shell 11, the workers can rotate the sealing plate 41 to move multiple sets of sealing plates 41, exposing the sand discharge port 4. This allows the fine sand between the first and second protective shells 11 to be discharged through the sand discharge port 4 and stored inside the sand storage plate 42 for later unified processing. Simultaneously, during the movement of the sealing plate 41, a pair of triangular plates 43 installed on the top of the sealing plate 41 guide the fine sand located on the top of the base 14, assisting it in entering the sand discharge port 4. During the movement of the sealing plate 41, the roller 51 rotates, at which point some of the fine sand will remain. The fine sand remaining on the surface of the base 14 is gradually reduced by the back-and-forth movement of the sealing plate 41. At this time, the rolling of the roller 51 will come into contact with some of the fine sand, and the vibration effect will be generated under the uneven contact rolling, shaking the fine sand on the surface of the sealing plate 41. During the rolling of the roller 51, the protrusion 63 will continuously contact the bottom of the support rod 61. The protrusion of the protrusion 63 will drive the support rod 61 to move up and down. At the same time, the fine sand on the surface of the fine sand plastic film 62 that enters through the first chute 5 will be pushed by the support rod 61 and moved to both sides according to the undulation of the middle of the plastic film 62 and discharged through the sand discharge port 4 into the sand storage plate 42 to wait for subsequent processing.

[0041] During the discharge of fine sand from inside storage tank 31, as the second rotating shaft 7 rotates, the stirring rod 72 rotates inside storage tank 31, stirring the fine sand inside storage tank 31 and breaking up any clumps in the sand to reduce their presence. As the rotation speed of the second rotating shaft 7 increases, the extension plate 8 moves outward under centrifugal force, causing the extension plate 8 to come into contact with the collision plate 81. When the extension plate 8 and the collision plate 81 collide, the through grooves in the extension plate 8 and the collision plate 81 can pick up some of the clumps of fine sand, breaking them up when they collide. During the movement of the sealing plate 41, the rotation of the roller 51 causes multiple sets of protrusions 63 to continuously come into contact with the third rotating shaft 9. The rotation of the third rotating shaft 9 drives the support rod 61 to move, causing the middle of the plastic film 62 to undulate up and down.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A flame-retardant and explosion-proof device for lithium battery components, comprising a base (14); characterized in that: The base (14) is fixedly connected to the top of the second protective shell (11); the side wall of the second protective shell (11) is slidably connected to the first protective shell (1) via a slide rail; the middle of the base (14) is rotated by a motor to a first rotating shaft (15); a pair of clamping plates (13) are installed on the top of the first rotating shaft (15), and the clamping plates (13) are adjusted by bolts and nuts; a lithium battery pack (12) is provided in the middle of the pair of clamping plates (13).

2. The flame-retardant and explosion-proof device for lithium battery modules according to claim 1, characterized in that: The first protective shell (1) and the second protective shell (11) are respectively filled from the inside out with a titanium alloy layer (2), a composite material layer (21), a buffer layer (22), and an energy-absorbing layer (23); the titanium alloy layer (2) is a 0.3mm thick titanium alloy honeycomb structure (honeycomb pore size 5-8mm), filled with carbon fiber chopped strand mat, and covered with a polytetrafluoroethylene (PTFE) wear-resistant coating; the composite material layer (21) is made of ultra-high molecular weight polyethylene (UHMWPE) fiber, pressed through a gradient lamination process of "low density-medium density-high density" (UHMWPE). Each layer is 0.2-0.5 mm thick, with a total of 12-15 layers. Nano-sized alumina particles (50-100 nm in diameter) are added between the layers as a rigid reinforcing phase. The buffer layer (22) is filled by impregnating a shear-thickening fluid (based on polyethylene glycol with added nano-sized silica particles) into an ultra-thin glass fiber mesh to form a "flexible-rigid" dynamic response material. The energy-absorbing layer (23) is based on a flexible silicon-based aerogel (5-50 nm in diameter) and composited with 3D knitted memory foam fibers (polyether polyurethane) and bonded together with an elastic adhesive.

3. The flame-retardant and explosion-proof device for lithium battery modules according to claim 1, characterized in that: The titanium alloy layer (2) employs a titanium alloy honeycomb structure that disperses the instantaneous pressure generated by the explosion through "honeycomb collapse-deformation energy absorption" (which can reduce the peak pressure of the shock wave by more than 30%), thereby reducing direct fracture of the outer layer. Furthermore, the titanium alloy has a density of 4.5 g / cm³. 3 The honeycomb structure is weight-reduced; the nano-alumina particles filling the gaps between the layers of the composite material layer (21) enhance the penetration resistance, and at the same time, the friction between the particles further consumes the residual energy of the explosion shock wave; the overall thickness is controlled at 5-8mm; when the buffer layer (22) is impacted by the explosion shock wave or high-speed fragments, the shear-thickening fluid instantly changes from liquid to solid (shear-thickening effect), and absorbs more than 80% of the instantaneous impact force through intermolecular friction, thus delaying energy transfer; the energy-absorbing layer (23) utilizes the porous structure of aerogel and the deformation recovery of memory foam to initially absorb the low-frequency vibration energy of the explosion shock wave, and the density of the aerogel is 0.1-0.3g / cm³. 3 This significantly reduces the overall weight.

4. The flame-retardant and explosion-proof device for lithium battery modules according to claim 1, characterized in that: The second protective shell (11) is fixedly connected to the top of a support frame (3); the support frame (3) is fixedly connected to the top of a storage box (31); the storage box (31) has discharge ports (32) on both sides; the storage box (31) has guide plates (33) fixedly connected to both sides of the storage box (31) at positions corresponding to the discharge ports (32), and the bottom of the support frame (3) is set towards the lithium battery pack (12); a temperature sensor is installed at the bottom of the support frame (3).

5. The flame-retardant and explosion-proof device for lithium battery modules according to claim 1, characterized in that: The base (14) has a sand storage plate (42) threaded to its bottom; the base (14) has multiple sand discharge ports (4) arranged in a circular array on its top; the first rotating shaft (15) has multiple sealing plates (41) rotatably connected around its perimeter, and the width of the sealing plate (41) is greater than the diameter of the sand discharge port (4); the top two sides of the sealing plate (41) are fixed with triangular plates (43).

6. The flame-retardant and explosion-proof device for lithium battery modules according to claim 5, characterized in that: A first groove (5) is provided in the middle of the multiple sets of triangular plates (43); a roller (51) is rotatably provided at the bottom of the sealing plate (41); a limiting plate (52) is rotatably connected to both sides of the roller (51); the limiting plate (52) and the sealing plate (41) are connected by a spring rod.

7. The flame-retardant and explosion-proof device for lithium battery modules according to claim 5, characterized in that: The top of the sealing plate (41) is provided with a second groove (6) between a pair of triangular plates (43); plastic film (62) is fixed to both ends of the second groove (6); a support rod (61) is fixed to the lower middle part of the plastic film (62); multiple sets of protrusions (63) are fixed to the surface of the roller (51); the bottom of the support rod (61) is in contact with the roller (51).

8. A flame-retardant and explosion-proof device for lithium battery modules according to claim 4, characterized in that: The bottom of the storage box (31) is rotatably connected to a second rotating shaft (7); the top of the second rotating shaft (7) is rotatably connected to a positioning rod (71), and both ends of the positioning rod (71) are fixed to the inner wall of the storage box (31); a stirring rod (72) is fixed to the middle of the second rotating shaft (7).

9. A flame-retardant and explosion-proof device for lithium battery modules according to claim 8, characterized in that: The end of the stirring rod (72) is slidably connected to an extension plate (8) via an elastic rope; a collision plate (81) is rotatably connected to the lower part of the middle of the positioning rod (71); multiple sets of through grooves are opened on the surfaces of the extension plate (8) and the collision plate (81).

10. A flame-retardant and explosion-proof device for lithium battery modules according to claim 7, characterized in that: The bottom of the support rod (61) is rotatably connected to a third rotating shaft (9); the third rotating shaft (9) and the surface of the roller (51) are in contact.

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