CN211265562U - Lithium battery thermal runaway protection pad - Google Patents
Lithium battery thermal runaway protection pad Download PDFInfo
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- CN211265562U CN211265562U CN201922147391.0U CN201922147391U CN211265562U CN 211265562 U CN211265562 U CN 211265562U CN 201922147391 U CN201922147391 U CN 201922147391U CN 211265562 U CN211265562 U CN 211265562U
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- gel
- lithium battery
- thermal runaway
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- strip
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model relates to a thermal-insulated, cooling and flame retardant material make and application, specifically be a thermal-insulated, cooling and fire-retardant lithium cell thermal runaway protection pad, it includes at least individual layer gel piece, the four sides of gel piece form the banding structure through high strength and high melting point plastic film banding, the upper surface and the lower surface of gel piece or cover have the protective film of high strength low melting point, and/or cover the explosion-proof protection layer that has flexibility or rigid wire mesh to constitute, protective film can be the protective film structure that technical personnel in the field all know, and the lateral surface of gel piece is provided with the supporting leg. When the lithium battery thermal runaway protection pad is used for the surface of a lithium battery package, the high temperature and high heat of the surface of the package can be effectively treated when the lithium battery thermal runaway occurs. When the temperature of the outer surface of the top of the packaging piece reaches 120-200 ℃, the gel generates gas to break the gel sheet to release the gel, and the gel is spread on the corrugated paper on the surface of the packaging piece to absorb heat and reduce the temperature.
Description
Technical Field
The application relates to the field of manufacturing and application of heat-insulating, cooling and flame-retardant materials, in particular to a heat-insulating, cooling and flame-retardant lithium battery thermal runaway protective pad.
Background
According to statistics, the air transportation volume of goods of lithium batteries and lithium-containing battery equipment in China reaches 50 million tons every year in recent years. The lithium battery is easy to smoke, fire and burn and even explode due to vibration, impact, collision, extrusion and the like caused by the influence of air flow in the process of aviation transportation, and can seriously cause machine damage and death. At present, the unsafe events of lithium batteries in the airplane passenger cabin occur in China every year, and the number of the unsafe events reaches dozens of years; the unsafe events of lithium batteries as goods for transportation are also counted each year. Unsafe events of lithium batteries have become the focus of air transportation at home and abroad.
Although the safety protection materials of the lithium battery are researched at home and abroad, such as the fireproof cover and the fireproof container of the lithium battery, the lithium battery still burns on fire in the experimental evaluation process.
There are two main types of safety protection to lithium cell goods: firstly, the lithium battery in a single package is subjected to a safety mode, the advantages are easy control and high protection efficiency, and the defects that each package needs to be protected and cannot be recycled, so that the cost is high; secondly, adopt the wrapper to protect a plurality of lithium cell packages, the advantage is that the recycle cost is relatively lower, and the shortcoming is that the lithium cell is difficult to control when failing.
A large amount of experimental results show that heat is mainly rebroadcast along the package top when lithium cell thermal runaway in the package, and package top and bottom are heated the biggest, consequently protect lithium cell package top and bottom, have very important meaning to the safety protection of lithium cell goods.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model provides a lithium battery thermal runaway protection pad for protecting the top and the bottom of a lithium battery package piece.
In order to achieve the purpose, the following technical scheme is adopted in the application:
the utility model provides a lithium cell thermal runaway protection pad which characterized in that: the gel sheet comprises at least a single layer of gel sheet, wherein four edges of the gel sheet are sealed by high-strength and high-melting-point plastic films to form a sealed edge structure, the upper surface and the lower surface of the gel sheet are covered by high-strength and low-melting-point protective films, and/or the gel sheet is covered by an explosion-proof protective layer consisting of flexible or rigid metal wire meshes, the protective films can be protective film structures known by the technical personnel in the field, and supporting legs are arranged on the outer sides of the gel sheet.
The gel sheets are of a double-layer or multi-layer structure, and adjacent gel sheets are connected by adopting glue for bonding or coating a protective film with an adhesive; the outer surface of the gel sheet is provided with the plastic reinforcing ribs, so that the gel sheet is convenient to use and protected.
Further, the single-side supporting legs are at least two, and the two supporting legs forming a pair are connected through a plastic sheet. The metal supporting legs are connected by plastic sheets with the width of 2-3 cm and the thickness of 1-3 mm; the plastic sheet is a polypropylene plastic sheet, a polyester plastic sheet or a polycarbonate plastic.
Still further, the support leg is an hourglass-shaped structure comprising an upper module, a lower module and a connecting nail, wherein the upper module is in a shape of being narrow at the bottom and wide at the top, the bottom of the upper module is in a planar structure, preferably in a circular or oval shape, and the size of the upper module is between 0.3 and 5cm, and the size of the top of the upper module is between 1.5 and 10 cm. The lower module is in a shape with a narrow top and a wide bottom, wherein the top is in a plane structure, the size is 0.3-5cm, the shape of the lower module is the same as that of the upper module, the size of the bottom is 1.5-10cm, and the shape of the lower module can be different from that of the upper module. The bottom of the upper module is placed on the upper part of the gel sheet on the outer side, the lower module is placed on the lower part of the gel sheet on the outer side, and the upper module and the lower module are connected through a connecting nail; the support legs pass through the single, double or multi-layered gel sheets.
Furthermore, the upper module and the lower module are made of flame-retardant rubber, silica gel, cork copper alloy, aluminum alloy, titanium alloy or steel; the connecting nails are of filiform structures, hollow tubular structures or strip-shaped structures, the connecting nails are made of high-strength fiber products, copper alloys, aluminum alloys, titanium alloys or steel, the number of the connecting nails is one or more, the connecting nails penetrate through the upper module, the gel sheet and the lower module, and the ends of the connecting nails are larger than the diameters of the filiform structures, the hollow tubular structures or the strip-shaped structures.
Further, the distance between the pair of support legs is 10-30 cm, preferably 25-30 cm.
Furthermore, a plurality of strip-shaped gel storage strips used before the gel sheet is canned for gelation are formed by adopting a plastic film through heat sealing, the plastic film is polyethylene, polyamide, polyethylene/polyamide or polyethylene/polyamide multilayer co-extrusion film, the thickness of the plastic film is 45-120 micrometers, and the width of each strip-shaped gel storage strip is 2-10 cm.
Furthermore, the gel sheet comprises a plurality of strip-shaped gel storage strips, the strip-shaped gel storage strips are isolated by heat sealing strips, the width of each heat sealing strip is 1-3cm, and the tail ends of the strip-shaped gel storage strips are provided with sealing strips which are formed by heat sealing through plastic films.
Furthermore, the single long gel storage strip is provided with a check type liquid inlet; a plurality of long form gel storage strips share a liquid inlet channel, and the liquid inlet channel both sides are equipped with the sealing strip, and the sealing strip forms through the plastic film heat-seal.
Further, the protective film is an ethylene-vinyl acetate copolymer film, a polyethylene film, a polystyrene film or a polyester film with the melting point lower than 200 ℃. Preferably the melting point is below 150 c, more preferably the melting point is below 100 c.
Furthermore, the adjacent gel sheets are connected by adopting a protective film coated with an adhesive, and the protective film is a nylon film or a polyamide film with the melting point higher than 120 ℃. Preferably having a melting point above 150 c, more preferably having a melting point above 200 c.
Meanwhile, an adhesive layer of elastomer type pressure sensitive adhesive, resin type pressure sensitive adhesive or white latex is used between adjacent gel sheets.
Further, the four sides of the gel sheet are sealed by bonding with an adhesive, or by using a protective film coated with an adhesive.
Further, the supporting leg includes two metal gasket, metal gasket's center is hollow, and hollow department adopts rubber stopper, wood stopper or silica gel stopper to fill, metal gasket's bottom is solid construction.
Furthermore, the diameter of the metal gasket is 2-4 cm, the periphery of the metal gasket is polished into a round edge, the wall thickness of the metal gasket is 1-3mm, and the height of the plug is 1-3mm higher than that of the metal gasket; the height of the metal gasket is 1-2 cm; the height of the solid structure is 1-5 mm; the height of the supporting legs is 3-4 mm higher than the thickness of the upper surface and the lower surface of the gel sheet.
Compared with the prior art, the application has the following beneficial effects:
1. when the lithium battery thermal runaway protection pad is used for the surface of a lithium battery package, the high temperature and high heat of the surface of the package can be effectively treated when the lithium battery thermal runaway occurs. When the temperature of the outer surface of the top of the packaging piece reaches 120-200 ℃, the gel generates gas to break the gel sheet to release the gel, and the gel is spread on the corrugated paper on the surface of the packaging piece to absorb heat and reduce the temperature. The gel sheet has the function of controlling the thermal runaway of the lithium battery below the gel sheet, so that the thermal runaway of the upper lithium battery is prevented, and the chain reaction speed of the thermal runaway of the lithium battery in the package is delayed.
2. This application gel piece can produce the inflation before breaking for there is the space between gel piece and the package surface, and the gel of strip form gel storage strip makes the gel piece break under great pressure, and the gel is released sharply, is convenient for spread on the package surface, plays the function of heat absorption, cooling.
3. The gel sheet can adopt a double-layer structure design: the first layer of gel sheet is low in cracking temperature, so that gel is released in time, heat absorption and cooling are carried out on high temperature released by the thermal runaway lithium battery, and even chain reaction of thermal runaway of the lithium battery in the packaging piece is interrupted; the surface of the second layer of gel sheet is provided with a protective film, and the gel in the gel sheet can be released at a higher temperature, so that the effects of continuously insulating heat and reducing temperature at a high temperature are achieved.
4. The surface of the gel sheet is provided with the plastic reinforcing ribs, so that the strength of the gel sheet is improved, and the operation is convenient.
5. The reinforcing ribs on the surface of the gel sheet are provided with supporting legs, the gel sheet is placed on the outer surface of the packaging piece, the weight of the packaging piece on the gel sheet is applied to the supporting legs, the gel sheet is prevented from being squeezed, the gel sheet is enabled to have a proper gap with the surface of the packaging piece, and the gel can be spread on the surface of the packaging piece after the gel sheet is broken.
6. The periphery of the gel sheet is sealed, so that the leakage of the gel can be effectively prevented.
Drawings
FIG. 1 is a schematic view of the structure of a single-layer gel sheet according to the present application.
FIG. 2 is a schematic view of the structure of a bi-or multi-layer gel sheet according to the present application.
Fig. 3 is a schematic view of the overall structure of the present application.
Fig. 4 is a schematic structural diagram of an explosion-proof protection layer according to the present application.
FIG. 5 is a schematic view of the position of the support leg of the present application through the gel sheet.
FIG. 6 is a schematic view of a support leg configuration of the present application.
In the drawings: 1-sealing strip, 2-liquid inlet channel, 3-one-way liquid inlet, 4-heat sealing strip, 5-gel storage strip, 6-first gel sheet, 7-second gel sheet, 8-adhesive layer, 9-edge sealing structure, 10-protective film, 11-explosion-proof protective layer, 12-supporting leg and 13-plastic strip.
Detailed Description
Example 1
The utility model provides a lithium cell thermal runaway protection pad includes the gel piece of at least individual layer, the four sides of gel piece carry out the banding through high strength and high melting point plastic film and form banding structure 9, the upper surface and the lower surface of gel piece cover have high strength low melting point protective film 10 and/or cover have the explosion-proof protective layer that flexible or rigid wire mesh constitutes, protective film 10 can be the protective film 10 structure that the technical personnel in the field all know, and the outside one side of gel piece is provided with supporting leg 12. When the lithium battery thermal runaway protection pad is used for the surface of a lithium battery package, the high temperature and high heat of the surface of the package can be effectively treated when the lithium battery thermal runaway occurs. When the temperature of the outer surface of the top of the packaging piece reaches 120-200 ℃, the gel generates gas to break the gel sheet to release the gel, and the gel is spread on the corrugated paper on the surface of the packaging piece to absorb heat and reduce the temperature. The gel sheet has the function of controlling the thermal runaway of the lithium battery below the gel sheet, so that the thermal runaway of the upper lithium battery is prevented, and the chain reaction speed of the thermal runaway of the lithium battery in the package is delayed.
Example 2
As shown in fig. 1, the lithium battery thermal runaway protection pad comprises at least a single layer of gel sheet, four sides of the gel sheet are sealed by high-strength and high-melting-point plastic films to form a sealed edge structure 9, the upper surface and the lower surface of the gel sheet are covered with a high-strength low-melting-point protection film 10 and/or an explosion-proof protection layer composed of flexible or rigid metal wire meshes, the protection film 10 can be a protection film 10 structure known by those skilled in the art, and one side of the gel sheet facing outwards is provided with support legs 12.
As shown in fig. 2, the gel sheets have a double-layer or multi-layer structure, and adjacent gel sheets are connected by using an adhesive or a protective film 10; the outer surface of the gel sheet is provided with the plastic reinforcing ribs, so that the gel sheet is convenient to use and protected. The two-layer structure includes a first gel sheet 6 and a second gel sheet 7.
As shown in FIG. 5, at least two single-side support legs 12 are provided, and the two support legs 12 forming a pair are connected to each other by a plastic sheet. The metal supporting legs 12 are connected by plastic sheets with the width of 2-3 cm and the thickness of 1-3 mm; the plastic sheet is a polypropylene plastic sheet, a polyester plastic sheet or a polycarbonate plastic.
As shown in FIG. 6, the support leg 12 is an hourglass-shaped structure including an upper module having a narrow lower portion and a wide upper portion, a planar bottom structure, preferably circular or oval, having a dimension of between 0.3 and 5cm and a top dimension of between 1.5 and 10cm, and attachment pegs. The lower module is in a shape with a narrow top and a wide bottom, wherein the top is in a plane structure, the size is 0.3-5cm, the shape of the lower module is the same as that of the upper module, the size of the bottom is 1.5-10cm, and the shape of the lower module can be different from that of the upper module. The bottom of the upper module is placed on the upper part of the gel sheet on the outer side, the lower module is placed on the lower part of the gel sheet on the outer side, and the upper module and the lower module are connected through a connecting nail; the support legs 12 pass through a single, double or multi-layer gel sheet.
The upper module and the lower module are made of flame-retardant rubber, silica gel, cork copper alloy, aluminum alloy, titanium alloy or steel; the connecting nails are of filiform structures, hollow tubular structures or strip-shaped structures, the connecting nails are made of high-strength fiber products, copper alloys, aluminum alloys, titanium alloys or steel, the number of the connecting nails is one or more, the connecting nails penetrate through the upper module, the gel sheet and the lower module, and the ends of the connecting nails are larger than the diameters of the filiform structures, the hollow tubular structures or the strip-shaped structures. The distance between the pair of legs 12 is 10-30 cm, preferably 25-30 cm.
As shown in fig. 1-3, the gel sheet comprises a plurality of strip-shaped gel storage bars 5, the strip-shaped gel storage bars 5 are separated by heat seal bars 4, and the width of the heat seal bar 4 is 1-3 cm. The single long gel storage strip 5 is provided with a non-return liquid inlet; the plurality of strip-shaped gel storage strips 5 share one liquid inlet channel 2.
The protective film 10 is an ethylene-vinyl acetate copolymer film, a polyethylene film, a polystyrene film or a polyester film with the melting point lower than 200 ℃. Preferably the melting point is below 150 c, more preferably the melting point is below 100 c.
The adjacent gel sheets are connected by a protective film 10, and the protective film 10 is a nylon film or a polyamide film with the melting point higher than 120 ℃. Preferably having a melting point above 150 c, more preferably having a melting point above 200 c.
Meanwhile, an elastic pressure-sensitive adhesive, a resin pressure-sensitive adhesive or a white latex adhesive layer 8 is arranged between the adjacent gel sheets.
When the structure is a double-layer or multi-layer structure, the liquid inlet of the gel sheet at the bottom layer is overlapped with the opposite side of the liquid inlet of the gel sheet at the top layer, an adhesive is coated on the film where the liquid inlet channel 2 shared by the liquid inlets is positioned, and then the adhesive is bent and adhered on the gel sheet.
Or the two sides of the liquid inlet of the bottom gel sheet and the two sides of the liquid inlet of the top gel sheet are connected together by the adhesive, the width of the adhesive is 1-3cm, then the adhesive part is bent and is adhered together by the adhesive or is sewed together by a thread.
As shown in FIG. 5, the support leg 12 comprises two metal gaskets, the metal gaskets are hollow, the hollow parts are filled with rubber plugs, solid wood plugs or silica gel plugs, and the bottom ends of the metal gaskets are of solid structures. The diameter of the metal gasket is 2-4 cm, the periphery of the metal gasket is polished into a round edge, the wall thickness of the metal gasket is 1-3mm, and the height of the plug is 1-3mm higher than that of the metal gasket; the height of the metal gasket is 1-2 cm; the height of the solid structure is 1-5 mm; the height of the supporting legs 12 is 3-4 mm higher than the thickness of the upper surface and the lower surface of the gel sheet.
Claims (10)
1. The utility model provides a lithium cell thermal runaway protection pad which characterized in that: the anti-explosion gel sheet comprises at least a single-layer gel sheet, four edges of the gel sheet are sealed by plastic films to form a sealed edge structure (9), the upper surface and the lower surface of the gel sheet are covered with protective films (10) and/or explosion-proof protective layers formed by metal wire meshes, and supporting legs (12) are arranged on the outer sides of the gel sheet.
2. The lithium battery thermal runaway protective mat according to claim 1, wherein: the gel sheets are of a double-layer or multi-layer structure, and adjacent gel sheets are connected by adopting glue or adopting a protective film (10) coated with the glue; the outer surface of the gel sheet is provided with supporting legs (12), and plastic reinforcing ribs are arranged between the supporting legs (12).
3. The lithium battery thermal runaway protective mat according to claim 1, wherein: at least two single-side supporting legs (12) are arranged, and the two supporting legs (12) forming a pair are connected through a plastic sheet; the plastic sheet is a polypropylene plastic sheet, a polyester plastic sheet or a polycarbonate plastic.
4. The lithium battery thermal runaway protection mat according to claim 1 or 3, wherein: the supporting legs (12) are of an hourglass-shaped structure and comprise upper modules, lower modules and connecting nails, the upper modules are narrow at the lower parts and wide at the upper parts, the bottoms of the upper modules are of plane structures, the lower modules are of narrow at the upper parts and wide at the lower parts, the tops of the lower modules are of plane structures and are the same as the upper modules in shape, the bottoms of the upper modules are placed at the upper parts of the outer sides of the gel sheets, the lower modules are placed at the lower parts of the outer sides of the gel sheets, and the upper modules and the lower; the support legs (12) are threaded through the single, double or multi-layered gel sheets.
5. The lithium battery thermal runaway protective mat according to claim 4, wherein: the upper module and the lower module are made of flame-retardant rubber, silica gel, cork copper alloy, aluminum alloy, titanium alloy or steel; the connecting nails are of filiform structures, hollow tubular structures or strip-shaped structures, the connecting nails are made of fiber products, copper alloys, aluminum alloys, titanium alloys or steel, the number of the connecting nails is one or more, the connecting nails penetrate through the upper module, the gel sheet and the lower module, and the ends of the connecting nails are larger than the diameters of the filiform structures, the hollow tubular structures or the strip-shaped structures; the distance between adjacent support legs (12) is 10-30 cm.
6. The lithium battery thermal runaway protective mat according to claim 1, wherein: the multiple long-strip-shaped gel storage strips (5) used before the gel sheet is canned for gelation are formed by adopting a plastic film through heat sealing, the plastic film is polyethylene, polyamide, polyethylene/polyamide or a polyethylene/polyamide multilayer co-extrusion film, the thickness of the plastic film is 45-120 micrometers, the width of each long strip is 2-10 cm, the long-strip-shaped gel storage strips (5) are isolated by adopting heat sealing strips (4), and the width of the heat sealing strips (4) is 1-3 mm; the tail end of the strip-shaped gel storage strip (5) is provided with a sealing strip (1), and the sealing strip (1) is formed by heat sealing through a plastic film; each strip-shaped gel storage strip (5) is provided with a check type liquid inlet; a plurality of long strip-shaped gel storage strips (5) share one liquid inlet channel (2), sealing strips (1) are arranged on two sides of the liquid inlet channel (2), and the sealing strips (1) are formed by heat sealing of plastic films.
7. The lithium battery thermal runaway protective mat according to claim 2, wherein: the protective film (10) on the surface of the gel sheet after the gel sheet is filled with gel is an ethylene-vinyl acetate copolymer film, a polyethylene film, a polystyrene film or a polyester film with the melting point lower than 200 ℃.
8. The lithium battery thermal runaway protection mat according to any one of claims 1-3 and 5-7, wherein: the adjacent gel sheets are bonded by adopting an elastomer pressure-sensitive adhesive, a resin pressure-sensitive adhesive or white latex; or a protective film (10) coated with adhesive is adopted for connection, and the protective film (10) is a nylon film or a polyamide film with the melting point higher than 120 ℃.
9. The lithium battery thermal runaway protection mat according to any one of claims 1-3 and 5-7, wherein: the four sides of the gel sheet are sealed by bonding with an adhesive, or by using a protective film (10) coated with an adhesive.
10. The lithium battery thermal runaway protection mat according to any one of claims 1-3 and 5-7, wherein: the supporting leg (12) comprises two metal gaskets, the center of each metal gasket is hollow, the hollow part is filled with a rubber plug, a solid wood plug or a silica gel plug, and the bottom end of each metal gasket is of a solid structure; the diameter of the metal gasket is 2-4 cm, the periphery of the metal gasket is polished into a round edge, the wall thickness of the metal gasket is 1-3mm, and the height of the plug is 1-3mm higher than that of the metal gasket; the height of the metal gasket is 1-2 cm; the height of the solid structure is 1-5 mm; the height of the supporting legs (12) is 3-4 mm higher than the thickness of the upper surface and the lower surface of the gel sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922147391.0U CN211265562U (en) | 2019-12-04 | 2019-12-04 | Lithium battery thermal runaway protection pad |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922147391.0U CN211265562U (en) | 2019-12-04 | 2019-12-04 | Lithium battery thermal runaway protection pad |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211265562U true CN211265562U (en) | 2020-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922147391.0U Active CN211265562U (en) | 2019-12-04 | 2019-12-04 | Lithium battery thermal runaway protection pad |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211265562U (en) |
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2019
- 2019-12-04 CN CN201922147391.0U patent/CN211265562U/en active Active
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