Lithium battery thermal runaway heat insulation buffer fire extinguishing protection device

Abstract

The invention discloses a lithium battery thermal runaway heat insulation buffer fire extinguishing protection device which comprises a box body and a box cover capable of being turned over to cover the box body in a sealing mode, a pressure relief opening is formed in the box cover or / and the box body, and a quenching flame arrester is installed in the pressure relief opening in a matched mode; wave energy absorption pieces are installed on the inner wall of the box body and are combined energy absorption pieces in a wave continuous shape or protruding single energy absorption pieces. According to the quenching flame arrester, nearby flames can be timely and effectively quenched, the flames are prevented from disordering and spreading, the fire extinguishing efficiency and the fire extinguishing strength are enhanced, and the quenching flame arrester located at the pressure relief opening or the exhaust opening not only has the flame quenching effect, but also has the pressure dredging or pressure relief effect; the explosion resistance is improved through the double-layer box plate, flame diffusion and explosion pressure dredging are jointly inhibited through the quenching flame arrester and the wave energy absorption piece, explosion impact and high-temperature conduction are resisted through the composite heat insulation buffer layer, the safety of a passenger cabin is guaranteed, and the device is suitable for aviation lithium battery emergency disposal scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation safety protection equipment, and in particular to a lithium battery thermal runaway insulation buffer fire extinguishing protection device. Background Art

[0002] With the widespread use of lithium batteries in electronic devices, fires and explosions caused by thermal runaway in aircraft cabins have become frequent. If a lithium battery or electronic device containing a lithium battery catches fire due to thermal runaway, it is typically isolated and extinguished in a protective bag or box. However, if a lithium battery or electronic device containing a lithium battery burns inside the bag or box, the flames can spread wildly. If not promptly extinguished, the flames can spread and potentially increase the risk of fire. Chinese Patent CN106621127A discloses a fire-resistant and explosion-proof emergency disposal box. The box consists of a three-layer structure: an outer layer of brushed aluminum alloy, a middle layer of flexible foam, and an inner layer of alumina. The box also features a filtered exhaust vent that exhausts smoke through a metal protective mesh or filter box, but this does not effectively block flame propagation. During an explosion, high-temperature flames could escape, leading to secondary disaster risks. The middle layer, made of a single foam material, is ineffective in dissipating the explosive energy and is unable to withstand the impact of a thermal runaway explosion from a high-energy 18650 lithium battery (≤300wh). The existing protective box's pressure relief vents or exhaust vents, as well as the inside of the protective box, are not equipped with special flame quenching devices. This will result in the flame inside the protective box not being quenched promptly and effectively, and the flame will spread randomly within the protective box, and may even gather to intensify the fire or spread randomly to other locations where scattered fragments of electronic equipment containing lithium batteries are easily ignited, increasing the difficulty of fire extinguishing, and may even be released to external areas through the pressure relief vents or exhaust vents, causing harm. Summary of the Invention

[0003] The purpose of the present invention is to overcome the technical problems pointed out in the background technology, and provide a lithium battery thermal runaway insulation buffer fire extinguishing protection device, in which a quenching flame arrester is installed at the pressure relief port or the exhaust port, which can timely and effectively quench the nearby flames, prevent the flames from spreading and spreading, and enhance the fire extinguishing efficiency and fire extinguishing intensity. The quenching flame arrester located at the pressure relief port or the exhaust port not only quenches the flames, but also relieves pressure or relieves pressure.

[0004] The purpose of the present invention is achieved through the following technical solutions: A lithium battery thermal runaway insulation buffer fire extinguishing protection device comprises a box body and a box cover with a flip-up sealing cover fitted on the box body; a pressure relief port is provided on the box cover and / or the box body, and a quenching flame arrester is fitted in the pressure relief port.

[0005] In order to better implement the present invention, a quenching flame arrester is installed on the box cover and / or the box body, and a filter is installed on the pressure relief port.

[0006] Preferably, a wave energy absorbing member is installed on the inner wall of the box body, and the wave energy absorbing member is a wave-shaped continuous combined energy absorbing member or a convex single energy absorbing member; the wave energy absorbing member has an arc-shaped surface wall and a sound-absorbing energy-absorbing cavity located on the inner side of the arc-shaped surface wall, the arc-shaped surface wall of the wave energy absorbing member is provided with a plurality of quenching holes, and the sound-absorbing energy-absorbing cavity of the wave energy absorbing member is filled with sound-absorbing flame-retardant energy-absorbing material.

[0007] Preferably, the quenching flame arrester is composed of a plurality of overlapping quenching structure monomers, wherein the quenching structure monomer is spirally wound from the inside to the outside by a quenching extension layer or is composed of a plurality of concentric layer units tightly attached from the inside to the outside, and the concentric layer unit is annularly wound by a quenching extension layer.

[0008] Preferably, the quenching extension layer is composed of a surface layer A, a surface layer B and a flame guide arc plate connected between the surface layer A and the surface layer B. The arc surface of the flame guide arc plate is wavy or triangular in shape as a whole. The flame guide arc plate divides the space between the surface layer A and the surface layer B and forms a flame quenching channel.

[0009] Preferably, the flame quenching channels of the end faces of adjacent quenching structure monomers in the quenching flame arrester are staggered with each other, the end faces of the first and last quenching structure monomers in the quenching flame arrester are installed with end side connectors, and end side connectors are installed between adjacent quenching structure monomers in the middle of the quenching flame arrester. The quenching flame arresters are connected in the length direction by limiting connecting rods to form a limiting cylindrical cage, and all the quenching structure monomers of the quenching flame arrester are located inside the limiting cylindrical cage.

[0010] Preferably, the quenching structure monomer of the quenching flame arrester is externally covered with a connecting shaping panel; the end side connecting piece includes an annular edge body and a plurality of end side reinforcement beams connected to the annular edge body, and gap spaces are formed between adjacent end side reinforcement beams in the end side connecting piece, and all gap spaces of the end side connecting piece are combined to form an end side gap space; the annular edge body of the end side connecting piece is distributed with a plurality of end side connection positions, and the end side connection positions of all end side connecting pieces in the quenching flame arrester correspond in the length direction of the quenching flame arrester and are connected and fixed in series by limiting connecting rods.

[0011] Preferably, the opening position of the top of the box body has a sealing edge A, the box cover has a sealing edge B that cooperates with the sealing edge A for sealing, an annular sealing groove is provided on the sealing contact surface of the sealing edge A, and a sealing protrusion that seals with the sealing groove is provided on the sealing contact surface of the sealing edge B, and a sealing rubber and / or high-temperature resistant foam material is provided in the sealing groove; the box cover is provided with a tempered glass observation window.

[0012] Preferably, the box body and / or the box cover are both made of double-layer box board materials, and the double-layer box board materials are composed of a supporting structure layer and a composite thermal insulation buffer layer. The supporting structure layer is made of high-strength aluminum, lightweight metal or carbon fiber composite material and is coated with a high-temperature resistant coating on the outside, and the thickness of the supporting structure layer is 1 to 3 mm; the composite thermal insulation buffer layer includes an impact-resistant layer and a thermal insulation layer, and the impact-resistant layer of the composite thermal insulation buffer layer is arranged on the inner side of the supporting structure layer; the impact-resistant layer has a thickness of 5 to 30 mm, a density of 80-200 kg / m³ and is made of one or more of polyimide foam, ceramic foam or silicone foam, and the thermal insulation layer has a thickness of 5 to 30 mm, a density of 50 to 400 kg / m³ and is made of one or more of high silica fiber, ceramic fiber, aluminum silicate fiber felt or aerogel composite material.

[0013] Preferably, a high-temperature resistant coating that can withstand temperatures of not less than 1000°C is provided between the inner side of the supporting structure layer and the impact-resistant layer of the composite thermal insulation buffer layer, and a flame-retardant layer is provided on the inner side of the thermal insulation layer of the composite thermal insulation buffer layer, and the flame-retardant layer is made of ceramic fiber cloth that can withstand temperatures of not less than 800°C.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: (1) The present invention is provided with a quenching flame arrester installed at the pressure relief port or the exhaust port, which can timely and effectively quench nearby flames, prevent the flames from spreading and spreading, and enhance the efficiency and intensity of fire extinguishing. The quenching flame arrester located at the pressure relief port or the exhaust port not only quenches the flames, but also relieves the pressure or relieves the pressure. A filter is also installed at the pressure relief port or the exhaust port, and the toxic gases are filtered and discharged after being discharged by the filter.

[0015] (2) The present invention can be used for both pre-protection treatment of items that have not experienced thermal runaway and post-protection treatment of items that have experienced thermal runaway. The items can be placed in a box and isolated from the air to extinguish the fire, or fire extinguishing materials can be placed inside the box first and then the items can be placed to extinguish the fire. In the process of handling the thermal runaway items, no metal melt, flame or toxic substance splashing will occur, effectively reducing the hazards of lithium battery thermal runaway accidents. The present invention provides a wave energy absorbing part inside the box. The flames generated by the combustion of the thermal runaway lithium battery product are quenched by the quenching holes of the wave energy absorbing part and each quenching flame arrester. If the thermal runaway lithium battery product explodes, the shock wave effect generated by the explosion reaches the wave energy absorbing part and is divided and absorbed by the wave energy absorbing part. If the flame is transmitted to the wave energy absorbing part, it can be quenched by the quenching holes. At the same time, the sound-absorbing and flame-retardant energy-absorbing material plays the role of sound-absorbing, energy-absorbing and flame-retardant.

[0016] (3) The present invention improves explosion resistance through double-layer box panels, suppresses flame spread and relieves explosion pressure through quenching flame arresters and wave energy absorbers, and uses a composite insulation buffer layer to combine foam energy absorption and fiber insulation advantages to resist explosion impact and high temperature conduction, thereby ensuring cabin safety and being suitable for aviation lithium battery emergency disposal scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the external structure of the quenching protection device in the embodiment; Figure 2 for Figure 1 Schematic diagram of the structure without the box cover; Figure 3 for Figure 2 A schematic diagram of a partial cross-sectional structure; Figure 4 Schematic diagram of the preferred layout of the composite thermal insulation buffer layer in the embodiment; Figure 5 The schematic diagram of the structure of the combination of two quenching structure monomers is given as an example of an embodiment; Figure 6 for Figure 5 Schematic diagram of the structure of the combined covering and connecting shaping panels; Figure 7 for Figure 6 Schematic diagram of the principle of serial fixation through limit connecting rods after assembly; Figure 8 Schematic diagram of the side structure of the quenched extension layer in the embodiment.

[0018] The names corresponding to the reference numerals in the accompanying drawings are: 1 - Box body, 11 - Sealing edge A, 111 - Sealing groove, 12 - Bottom plate, 13 - Side plate, 2 - Box lid, 21 - Sealing edge B, 22 - Cover plate, 23 - Hinge, 3 - Pressure relief vent, 4 - Metal lock, 5 - Tempered glass observation window, 6 - Handle, 7 - Wave energy absorber, 8 - Quenching flame arrester, 9 - Quenching structure unit, 91 - Quenching extension layer, 911 - Surface layer A, 912 - Surface layer B, 913 - Flame guide arc plate, 10 - End side connector, 101 - End side gap space, 102 - Annular edge body, 103 - End side reinforcement beam, 104 - End side connection position, 1041 - Limit connecting rod, 14 - Flame retardant layer, 15 - Thermal insulation layer, 16 - Impact resistant layer, 17 - High temperature resistant coating, 18 - Connecting plastic panel. DETAILED DESCRIPTION

[0019] Below in conjunction with embodiment, the present invention is described in further detail: Example

[0020] like Figure 1 、 Figure 2As shown, a lithium battery thermal runaway insulation buffer fire extinguishing protection device includes a box body 1 and a box cover 2 with a reversible sealing cover attached to the box body 1. The box cover 2 is reversibly connected to the box body 1 by a plurality of hinges 23. The box cover 2 and / or the box body 1 are provided with a pressure relief port 3 or an exhaust port. A quenching flame arrester 8 is installed in the pressure relief port 3 or the exhaust port. Preferably, a filter is installed in the pressure relief port 3 to filter out toxic gases or toxic substances. The box body 1 and / or the box cover 2 of the present invention are both made of double-layer box sheet material. The double-layer box sheet material consists of a supporting structure layer and a composite insulation buffer layer. The supporting structure layer is made of high-strength aluminum, lightweight metal or carbon fiber composite material and is coated on the outside with a high-temperature resistant coating that can withstand a temperature of not less than 600°C (that is, the coated high-temperature resistant coating is located on the outer side of the quenching protection device of the present invention). The thickness of the supporting structure layer is 1 to 3 mm, and the supporting structure layer provides mechanical structural support and external protection. The composite thermal insulation buffer layer includes an impact-resistant layer 16 and a thermal insulation layer 15. The impact-resistant layer 16 of the composite thermal insulation buffer layer is located inside the support structure layer (i.e., the support structure layer is located on the inner side of the box body 1). The impact-resistant layer 16 has a thickness of 5 to 30 mm and a density of 80-200 kg / m³, and is made of one or more of polyimide foam, ceramic foam, or silicone foam. The thermal insulation layer 15 has a thickness of 5 to 30 mm and a density of 50 to 400 kg / m³, and is made of one or more of high-silica fiber, ceramic fiber, aluminum silicate fiber felt, or aerogel composite material. The impact-resistant layer 16 is primarily used to absorb explosion impact energy and provide thermal insulation.

[0021] In some embodiments, a high-temperature resistant coating 17 with a temperature tolerance of not less than 1000°C is provided between the inner side of the support structure layer and the impact-resistant layer 16 of the composite heat-insulating buffer layer. A flame-retardant layer 14 is provided inside the heat-insulating layer 15 of the composite heat-insulating buffer layer. The flame-retardant layer 14 is made of ceramic fiber cloth with a temperature tolerance of not less than 800°C. The flame-retardant layer 14 plays a role in blocking high-temperature conduction. Figure 4As shown, the preferred composite thermal insulation buffer layer is sequentially manufactured from a high-temperature resistant coating 17, an impact-resistant layer 16, a thermal insulation layer 15, and a flame-retardant layer 14, wherein the high-temperature resistant coating 17 is located on one side of the support structure layer, and the flame-retardant layer 14 is located on the inner side of the box body 1. The composite thermal insulation buffer layer is sequentially manufactured from a high-temperature resistant coating 17, an impact-resistant layer 16, a thermal insulation layer 15, and a flame-retardant layer 14, which are preferably laminated layer by layer using a high-temperature resistant adhesive, with a total thickness of 15-60 mm. Preferably, the supporting structure layer (such as an aluminum shell) withstands external mechanical impact (such as transportation collision), and the surface ceramic coating blocks direct burning from external flames; the inner composite thermal insulation buffer layer and the flame retardant layer (ceramic fiber cloth) immediately suppress the flame from penetrating inward, with a temperature resistance of ≥800°C; the low thermal conductivity (≤0.05W / m・K) of the thermal insulation layer (aluminum silicate fiber felt, etc.) blocks heat conduction, making the outer surface temperature of the box ≤70°C (when the internal temperature is 1000°C); the impact-resistant layer (polyimide foam, etc.) absorbs the energy of the explosion shock wave (such as the impact energy of a 300Wh18650 lithium battery explosion) through material compression deformation; the high-temperature resistant coating (silicon carbide) forms a ceramic protective layer at extremely high temperatures to prevent the inner layer material from melting and failing.

[0022] The present invention features a quenching flame arrester 8 that effectively blocks flame propagation and channels explosion pressure, significantly improving safety. It can withstand the impact of a 300Wh lithium battery thermal runaway without flame leakage. The present invention is manufactured from a dual-layer composite thermal insulation buffer layer and a supporting structure layer. The supporting structure layer provides structural support. The composite thermal insulation buffer layer comprises a multi-layer composite structure consisting of an impact-resistant layer 16, a thermal insulation layer 15, a flame-retardant layer 14, and a high-temperature-resistant coating 17. This enhances structural toughness, absorbs shock waves, and provides excellent explosion resistance. It can withstand the shock pressure of a 300Wh 18650 lithium battery thermal runaway combustion explosion. Testing showed that neither the housing 1 nor the lid 2 suffered damage, providing excellent protection. The composite thermal insulation buffer layer blocks high-temperature conduction, absorbs shock waves, and blocks high-temperature propagation. The synergistic effect of the two layers extends emergency response time. When subjected to a 300Wh lithium battery thermal runaway shock, the outer surface temperature of the housing (excluding the flame arrester and the surrounding 10cm area) did not exceed 70°C when the internal temperature reached 1000°C.

[0023] In some embodiments, a quenching flame arrester 8 is installed on the box cover 2 and / or the box body 1. The quenching flame arrester 8 is installed on the inner wall of the box cover 2 and / or the box body 1. The quenching flame arrester 8 is not necessarily installed at the pressure relief port 3 or the exhaust port, but can also be directly installed on the inner wall of the box cover 2 and / or the box body 1, and flame quenching treatment is performed at different positions inside the box body 1.

[0024] In some embodiments, see Figure 3 The inner wall of the box body 1 is provided with a wave energy absorbing member 7. The box body 1 is surrounded by a bottom plate 12 and a side plate 13 to form a receiving cavity with an opening at the top. Figure 2As shown, the housing 1 is generally rectangular in shape (i.e., it has a rectangular accommodating chamber). Thus, the housing 1 has four side panels 13, one each located in the front, back, left, and right directions. The wave absorbers 7 are primarily mounted on the side panels 13 of the housing 1, with a smaller number also being mounted on the bottom panel 12 of the housing 1. The wave absorbers 7 are either wave-continuous composite absorbers or raised single absorbers. The raised single absorbers are arc-shaped single absorbers that protrude from the inner wall of the housing 1 and define a sound-absorbing cavity with the inner wall. The wave-continuous composite absorbers consist of multiple raised single absorbers connected in a wave-like arc. The wave absorbers 7 can be removably screwed or adhesively secured to the inner wall of the housing 1. The wave absorbers 7 are preferably manufactured from aluminum or other lightweight metals, or carbon fiber composite materials. The wave energy absorber 7 has a curved surface and a sound-absorbing cavity located within it. The cavity is the space between the curved surface of the wave energy absorber 7 and the inner wall of the housing 1. The curved surface of the wave energy absorber 7 is provided with a plurality of quenching holes. The cavity is filled with a sound-absorbing, flame-retardant, energy-absorbing material. For example, the sound-absorbing, flame-retardant, energy-absorbing material may be a honeycomb structure (i.e., a porous honeycomb structure) composed of glass wool (primarily for sound absorption), carbon fiber-reinforced resin-based composite material (primarily for energy absorption), and ceramic fiber (primarily for flame retardancy). If an explosion occurs within the housing 1, the shock wave generated by the explosion reaches the wave energy absorber 7, where it is divided and absorbed. If flames reach the wave energy absorber 7, they are quenched by the quenching holes. The sound-absorbing, flame-retardant, energy-absorbing material simultaneously provides sound absorption, energy absorption, and flame retardancy.

[0025] In some embodiments, the quenching flame arrester 8 is composed of a plurality of quenching structure monomers 9 stacked together, such as Figure 5 As shown, in this embodiment, the quenching structure monomer 9 is cylindrical in shape, and two adjacent quenching structure monomers 9 are overlapped in the height direction. The quenching structure monomer 9 is spirally rolled from the inside to the outside by the quenching extension layer 91, and the quenching structure monomer 9 is tightly rolled by the spiral stacking of the quenching extension layer 91 from the center to the outside; or, the quenching structure monomer 9 is composed of a number of concentric layer units tightly attached in sequence from the inside to the outside, and the concentric layer units are rolled into a ring shape by the quenching extension layer 91, that is, the quenching structure monomer 9 can be rolled concentrically by the quenching extension layer 91 into concentric layer units of different sizes, and then each concentric layer unit is tightly stacked in sequence from the inside to the outside. As shown Figure 8 As shown, Figure 8This is a schematic side view or cross-section of the quenching extension layer 91. The quenching extension layer 91 is composed of a surface layer A911, a surface layer B912, and a flame guiding arc plate 913 connected between the surface layers A911 and B912. The arc surface of the flame guiding arc plate 913 is generally wavy or triangular, and the flame guiding arc plate 913 divides the space between the surface layers A911 and B912, forming a flame quenching channel. The flame guiding channel is formed between the surface layers A911 and B912, and the flame guiding arc plate 913 divides the flame guiding channel with a wavy or triangular line. When the quenching extension layer 91 forms the quenching structure unit 9, see Figure 5 The quenching structure units 9 combine in cross-section to form honeycomb-shaped flame quenching channels. These channels guide the flame into the device, interrupting, segmenting, and quenching it. This allows flames entering the pressure relief or exhaust ports of the protective device to be quickly and effectively quenched. High-temperature flames generated by thermal runaway lithium batteries enter the quenching flame arrester 8 and are quenched by the honeycomb-shaped flame quenching channels (size ≤ 0.5 mm), achieving flame quenching and pressure relief.

[0026] In some embodiments, the flame quenching channels of the end faces of adjacent quenching structural monomers 9 in the quenching flame arrester 8 are staggered with each other, preferably staggered, that is, the flame quenching channels of adjacent quenching structural monomers 9 are staggered with each other and not interconnected; of course, they can also be not staggered. The end faces of the first and last quenching structural monomers 9 in the quenching flame arrester 8 are installed with end side connectors 10, and end side connectors 10 are installed between adjacent quenching structural monomers 9 in the middle of the quenching flame arrester 8. The quenching flame arrester 8 is connected in the length direction by a limiting connecting rod 1041 to form a limiting cylindrical cage, and all the quenching structural monomers 9 of the quenching flame arrester 8 are located inside the limiting cylindrical cage. Preferably, the quenching structural monomers 9 of the quenching flame arrester 8 are externally covered with a connecting shaping panel 18 (the quenching structural monomers 9 of the quenching flame arrester 8 can be covered with only a connecting shaping panel 18 without using a limiting connecting rod 1041, such as Figure 6 As shown; or a connecting shaping panel 18 is formed by combining a connecting shaping panel 18 with a connecting shaping panel 18, and the entire exterior of all quenching structure monomers 9 of the quenching flame arrester 8 is covered with a connecting shaping panel 18, and then all the limiting connecting rods 1041 are used to strengthen the connection and form a limiting cylindrical cage on the outside). Figure 6 、 Figure 7As shown, the end-side connector 10 includes an annular edge body 102 and a plurality of end-side reinforcement beams 103 connected to the annular edge body 102. Interstitial spaces are formed between adjacent end-side reinforcement beams 103 in the end-side connector 10. All interstitial spaces in the end-side connector 10 are collectively formed into an end-side interstitial space 101. The annular edge body 102 of the end-side connector 10 is provided with a plurality of end-side connection positions 104. The end-side connection positions 104 of all end-side connectors 10 in the quenching flame arrester 8 correspond to each other along the length of the quenching flame arrester 8 and are connected and fixed in series via a limiting connecting rod 1041.

[0027] like Figure 1 、 Figure 2 As shown, the mouth of the top of the box body 1 has a sealing edge A11, and the box cover 2 has a sealing edge B21 that seals with the sealing edge A11. An annular sealing groove 111 is provided on the sealing contact surface of the sealing edge A11, and a sealing protrusion that seals with the sealing groove 111 is provided on the sealing contact surface of the sealing edge B21. The sealing groove 111 is provided with sealing rubber and / or high-temperature resistant foam material (the high-temperature resistant foam material is preferably silicone foam). When the box cover 2 is closed on the box body 1, the sealing protrusion of the sealing edge B21 is pressed into the sealing groove 111, and the sealing protrusion is sealed and wrapped by the sealing rubber or high-temperature resistant foam material. A high-airtight seal is formed by mechanical pressing, which plays a role of high-temperature resistance and sealing, ensures good sealing, and can effectively isolate smoke leakage. The box cover 2 is provided with a tempered glass observation window 5 (temperature resistance ≥ 800°C, capable of real-time monitoring of the internal fire situation). Through the tempered glass observation window 5, the internal situation of the box body 1 (whether the fire is extinguished or whether a local explosion occurs) can be observed. The top plate of the box cover 2 is a cover plate 22, and the tempered glass observation window 5 is set on the cover plate 22. The cover plate 22 is provided with a pressure relief port 3 (or exhaust port), and the pressure relief port 3 (or exhaust port) is equipped with a quenching flame arrester 8. Figure 1 As shown, a metal lock 4 is installed between the box cover 2 and the box body 1, and the box cover 2 and the box body 1 are firmly locked by the metal lock 4. Handles 6 are fixed on opposite sides of the box body 1 for easy handling.

[0028] During use, dangerous civil aviation goods (primarily lithium batteries or electronic devices containing lithium batteries, such as portable electronic devices like laptops) that have not experienced thermal runaway, or lithium batteries or electronic devices containing lithium batteries that have experienced thermal runaway, are placed inside the box 1. The box lid 2 is closed and locked with a metal lock 4. For example, when a lithium battery or electronic device experiencing thermal runaway burns, the flame generated by the thermal runaway product is quenched by the quenching holes in the wave energy absorber 7 and the quenching flame arresters 8, reducing the flame's potential to spread. If the flame enters the exhaust or pressure relief port 3, the quenching flame arresters 8 in the exhaust or pressure relief port 3 quench the flame, preventing it from escaping through the exhaust or pressure relief port 3. At the same time, the toxic gases are filtered out by the filter before being released and discharged. If the thermal runaway lithium battery explodes, the shock wave generated by the explosion reaches the wave energy absorber 7, where it is divided and absorbed. If the flame propagates to the wave energy absorber 7, it is quenched by the quenching holes. The sound-absorbing, flame-retardant, and energy-absorbing materials simultaneously provide sound-absorbing, energy-absorbing, and flame-retardant properties.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A lithium battery thermal runaway insulation buffer fire extinguishing protection device, characterized by: The invention comprises a box body and a box cover which is a reversible sealing cover and is fitted on the box body. The box cover and / or the box body are provided with a pressure relief port, and a quenching flame arrester is fitted in the pressure relief port.

2. The lithium battery thermal runaway insulation buffer fire extinguishing protection device according to claim 1, characterized in that: A quenching flame arrester is installed on the box cover and / or the box body, and a filter is installed on the pressure relief port.

3. A lithium battery thermal runaway insulation buffer fire extinguishing protection device according to claim 1 or 2, characterized in that: A wave energy absorbing member is installed on the inner wall of the box body, and the wave energy absorbing member is a wave-shaped continuous combined energy absorbing member or a convex single energy absorbing member; the wave energy absorbing member has an arc-shaped surface wall and a sound-absorbing energy-absorbing cavity located on the inner side of the arc-shaped surface wall, and the arc-shaped surface wall of the wave energy absorbing member is provided with a plurality of quenching holes, and the sound-absorbing energy-absorbing cavity of the wave energy absorbing member is filled with sound-absorbing flame-retardant energy-absorbing material.

4. A lithium battery thermal runaway insulation buffer fire extinguishing protection device according to claim 1 or 2, characterized in that: The quenching flame arrester is composed of a plurality of overlapping quenching structure monomers, wherein the quenching structure monomer is spirally rolled from the inside to the outside by a quenching extension layer or is composed of a plurality of concentric layer units tightly attached from the inside to the outside, and the concentric layer unit is annularly rolled by a quenching extension layer.

5. The lithium battery thermal runaway insulation buffer fire extinguishing protection device according to claim 4, characterized in that: The quenching extension layer is composed of a surface layer A, a surface layer B and a flame guide arc plate connected between the surface layer A and the surface layer B. The arc surface of the flame guide arc plate is wavy or triangular in shape as a whole. The flame guide arc plate divides the space between the surface layer A and the surface layer B and forms a flame quenching channel.

6. The lithium battery thermal runaway insulation buffer fire extinguishing protection device according to claim 4, characterized in that: The flame quenching channels of the end faces of adjacent quenching structure monomers in the quenching flame arrester are staggered with each other, the end faces of the first and last quenching structure monomers in the quenching flame arrester are installed with end side connectors, and end side connectors are installed between adjacent quenching structure monomers in the middle of the quenching flame arrester. The quenching flame arresters are connected in the length direction by limiting connecting rods to form a limiting cylindrical cage, and all the quenching structure monomers of the quenching flame arrester are located inside the limiting cylindrical cage.

7. The lithium battery thermal runaway insulation buffer fire extinguishing protection device according to claim 6, characterized in that: The quenching structure monomer of the quenching flame arrester is covered with a connecting shaping panel on the outside; the end side connecting piece includes an annular edge body and a plurality of end side reinforcement beams connected to the annular edge body, and gap spaces are formed between adjacent end side reinforcement beams in the end side connecting piece, and all gap spaces of the end side connecting piece are combined to form an end side gap space; the annular edge body of the end side connecting piece is distributed with a plurality of end side connection positions, and the end side connection positions of all end side connecting pieces in the quenching flame arrester correspond in the length direction of the quenching flame arrester and are connected and fixed in series by limiting connecting rods.

8. The lithium battery thermal runaway insulation buffer fire extinguishing protection device according to claim 1, characterized in that: The top of the box body has a sealing edge A at the mouth, and the box cover has a sealing edge B that cooperates with the sealing edge A for sealing. An annular sealing groove is provided on the sealing contact surface of the sealing edge A, and a sealing protrusion that seals with the sealing groove is provided on the sealing contact surface of the sealing edge B. The sealing groove is provided with sealing rubber and / or high-temperature resistant foam material; the box cover is provided with a tempered glass observation window.

9. The lithium battery thermal runaway insulation buffer fire extinguishing protection device according to claim 1, characterized in that: The box body and / or box cover are both made of double-layer box board materials, and the double-layer box board materials are composed of a supporting structure layer and a composite thermal insulation buffer layer. The supporting structure layer is made of high-strength aluminum, lightweight metal or carbon fiber composite material and is coated with a high-temperature resistant coating on the outside. The thickness of the supporting structure layer is 1 to 3 mm; the composite thermal insulation buffer layer includes an impact-resistant layer and a thermal insulation layer, and the impact-resistant layer of the composite thermal insulation buffer layer is arranged on the inner side of the supporting structure layer; the impact-resistant layer has a thickness of 5 to 30 mm, a density of 80-200 kg / m³ and is made of one or more of polyimide foam, ceramic foam or silicone foam, and the thermal insulation layer has a thickness of 5 to 30 mm, a density of 50 to 400 kg / m³ and is made of one or more of high silica fiber, ceramic fiber, aluminum silicate fiber felt or aerogel composite material.

10. The lithium battery thermal runaway insulation buffer fire extinguishing protection device according to claim 9, characterized in that: A high-temperature resistant coating that can withstand temperatures of not less than 1000°C is provided between the inner side of the supporting structure layer and the impact-resistant layer of the composite thermal insulation buffer layer. A flame-retardant layer is also provided on the inner side of the thermal insulation layer of the composite thermal insulation buffer layer. The flame-retardant layer is made of ceramic fiber cloth that can withstand temperatures of not less than 800°C.

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