CN112563637A - Flame-retardant heat-dissipation lithium battery shell and preparation method thereof - Google Patents
Flame-retardant heat-dissipation lithium battery shell and preparation method thereof Download PDFInfo
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- CN112563637A CN112563637A CN202011500138.XA CN202011500138A CN112563637A CN 112563637 A CN112563637 A CN 112563637A CN 202011500138 A CN202011500138 A CN 202011500138A CN 112563637 A CN112563637 A CN 112563637A
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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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 invention discloses a flame-retardant heat-dissipation lithium battery shell which comprises an upper shell, wherein a plurality of strip-shaped heat dissipation holes are formed in the upper shell, a heat dissipation groove is formed in the upper shell, the bottom wall of an inner cavity of the heat dissipation groove positioned below a partition plate is downwards sunken to form an air outlet groove, sodium azide is arranged in the air outlet groove, and a glass cover is arranged at the top of the air outlet groove; the partition plate is provided with a plurality of mounting holes, air holes are formed in the outer sides of the mounting holes, the telescopic air bags made of flame retardant materials are arranged above the air holes, reaction components are arranged in the mounting holes and comprise liquid storage bags made of fragile glass materials, puncturing parts made of ceramic materials located at the bottoms of the liquid storage bags and balance weight parts located at the tops of the liquid storage bags. The invention improves the heat dissipation effect by adopting the heat dissipation holes and the heat dissipation grooves; the battery core and the shell of the flame-retardant heat-dissipation lithium battery are wrapped in the flame-retardant gas with the density higher than that of air, rapid combustion is further avoided, and the flame-retardant performance is improved.
Description
Technical Field
The invention relates to the field of flame-retardant heat-dissipation lithium battery shells, in particular to a flame-retardant heat-dissipation lithium battery shell and a preparation method thereof.
Background
At present, the lithium cell includes and is used for wrapping up the casing of electric core, and the casing is generally made by metal material, and includes upper portion open-ended box body and is used for shutoff box body upper end open-ended apron, sets up the utmost point post that the utmost point post wore out in supplying the lithium cell on the apron and perforates.
In the prior art, the insulation between the battery core and the shell is realized by sleeving an insulating bag on the battery core, and the insulation between the battery monomers is realized by sticking an insulating sticking film on the outer wall surface of the shell. The method has the following technical problems: poor flame retardant property and poor safety.
Disclosure of Invention
Aiming at the problems, the invention provides a flame-retardant heat-dissipation lithium battery shell, which solves the defects of poor flame-retardant performance and poor safety of the conventional lithium battery.
The technical scheme adopted by the invention is as follows:
a flame-retardant heat-dissipation lithium battery shell comprises an upper shell, wherein a plurality of strip-shaped heat dissipation holes are formed in the upper shell, a heat dissipation groove is formed in the upper shell, a partition plate is arranged in the heat dissipation groove, an inner cavity of the heat dissipation groove above the partition plate is opposite to the heat dissipation holes, the bottom wall of the inner cavity of the heat dissipation groove below the partition plate is recessed downwards to form an air outlet groove, sodium azide is arranged in the air outlet groove, and a glass cover is arranged at the top of the air outlet groove; the reaction assembly comprises a liquid storage bag made of fragile glass materials, a puncturing piece made of ceramic materials and a counterweight piece positioned at the top of the liquid storage bag, wherein the reaction assembly is arranged in the mounting hole, the counterweight piece comprises a limiting ring made of low-melting-point alloy with a melting point of 70 ℃, a clamping piece is arranged at the top of the reaction assembly, a frustum-shaped clamping groove is formed in the clamping piece, the outer surface of the limiting ring is matched with the clamping groove and used for preventing the reaction assembly from falling down, and a sodium hypochlorite solution is arranged in the liquid storage bag;
when the outside temperature reaches 70 ℃, the limiting ring is fused into liquid, the reaction assembly falls down to break the glass cover, so that the glass cover is broken to enable the sodium azide and the sodium hypochlorite solution to react to generate nitrogen, and the telescopic air bag extends to seal the heat dissipation hole. The traditional lithium battery shell can only improve the flame retardant property by relying on flame retardant materials, and the heat dissipation effect is improved by adopting the heat dissipation holes and the heat dissipation grooves; and when the ambient temperature reached and 70 ℃, make the spacing ring melt into liquid, the reaction assembly tenesmus breaks the glass cover, makes the glass cover broken make sodium azide react with sodium hypochlorite solution and generate nitrogen gas, makes scalable gasbag extend and seal the louvre, and then makes the electric core and the casing parcel of fire-retardant heat dissipation lithium cell in the flame retardant gas that density is greater than the air, further avoids rapid burning, has improved fire behaviour, and the gasbag has still improved shock resistance moreover, has reduced the direct impact to the lithium cell when the temperature risees.
Optionally, a water absorbing material is mounted on the side wall of the heat dissipation groove above the air outlet groove. The invention adopts the water absorption material which can absorb the four splashes of water during the reaction, thereby preventing the lithium battery from being corroded.
Optionally, the outer diameter of the middle part of the reservoir is larger than the outer diameters of the two ends. The outer diameter of the middle part of the liquid bag is larger than the outer diameters of the two ends, so that the limiting ring melting reaction assembly falls rapidly.
Optionally, a conducting strip is mounted at the top of the telescopic airbag, a liquid storage bag in which a power transformation liquid is stored is arranged outside the heat dissipation groove, and the liquid storage bag is provided with heat dissipation holes; the liquid stores up the bag and is used for separating flexible gasbag be equipped with positive plate and negative pole piece in the liquid stores up the bag, the positive plate passes through the positive pole of conductor wire intercommunication power, be equipped with first electric touch piece and second electric touch piece in the upper shell, the first electric touch piece of negative pole piece electric connection, the second electric touch piece electric connection power's negative pole for when scalable gasbag extends the top that extends the radiating groove, make the conducting strip relieve first electric touch piece and second electric touch piece simultaneously and switch on the circuit, make liquid store up the interior liquid of bag and become fixedly be used for fixed gasbag and then design gasbag, avoid the air to contact the lithium cell in a large number. The liquid in the liquid storage bag is changed into the fixed air bag for fixing the air bag so as to shape the air bag, so that a large amount of air is prevented from contacting the lithium battery, and meanwhile, the lithium battery is further sealed by reinforcing and shaping the air bag, so that the exposure of the lithium battery in the air is reduced; and the impact resistance is improved. The liquid storage bag is provided with the heat dissipation holes, so that the heat dissipation holes are more convenient to dissipate heat in an uncured state, can be increased, and further improve the heat dissipation performance.
Optionally, the upper shell is made of the following raw materials in parts by weight: 50-60 parts of ASA resin, 36-38 parts of polymethyl methacrylate, 20-26 parts of polycarbonate, 12-14 parts of polyhexafluoroethylene, 8-10 parts of glass beads, 8-10 parts of flame retardant, 1-3 parts of toughening agent and 0.5-1 part of lubricant. The invention adopts the improved formula to improve the flame retardant property of the upper shell.
Optionally, the anti-dripping agent also comprises 0.1-1 part of anti-dripping agent, and the anti-dripping agent also comprises 0.5-2 parts of antioxidant.
Optionally, the flame retardant comprises tetrabromobisphenol A, decabromodiphenylethane, antimony trioxide and zinc borate.
Optionally, the lubricant is selected from at least one of liquid paraffin, stearic acid amide, silicone oil or N, N-ethylene bis stearic acid amide.
The invention also discloses a preparation method of the flame-retardant heat-dissipation lithium battery shell, which comprises the following steps:
s1, putting the raw materials into a mixer, and mixing to obtain a mixed material;
and S2, feeding the mixed material prepared in the step S1 from a main feeding port of a double-screw extruder, feeding the flame retardant and the toughening agent from a side feeding port of the double-screw extruder, mixing, extruding and granulating.
(III) advantageous effects
1. The invention improves the heat dissipation effect by adopting the heat dissipation holes and the heat dissipation grooves; and when the ambient temperature reached and 70 ℃, make the spacing ring melt into liquid, the reaction assembly tenesmus breaks the glass cover, makes the glass cover broken make sodium azide react with sodium hypochlorite solution and generate nitrogen gas, makes scalable gasbag extend and seal the louvre, and then makes the electric core and the casing parcel of fire-retardant heat dissipation lithium cell in the flame retardant gas that density is greater than the air, further avoids rapid burning, has improved fire behaviour, and the gasbag has still improved shock resistance moreover, has reduced the direct impact to the lithium cell when the temperature risees.
2. The liquid in the liquid storage bag is changed into the fixed air bag for fixing the air bag so as to shape the air bag, so that a large amount of air is prevented from contacting the lithium battery, and meanwhile, the lithium battery is further sealed by reinforcing and shaping the air bag, so that the exposure of the lithium battery in the air is reduced; and the impact resistance is improved. The liquid storage bag is provided with the heat dissipation holes, so that the heat dissipation holes are more convenient to dissipate heat in an uncured state, can be increased, and further improve the heat dissipation performance.
Description of the drawings:
FIG. 1 is a front external structural view of a lithium battery case according to example 1 of the present invention;
FIG. 2 is a cross-sectional view of a retractable air bag folded at the side of a lithium battery case with flame retardancy and heat dissipation according to example 1 of the present invention;
FIG. 3 is an enlarged view of a portion A of a lithium battery casing according to example 1 of the present invention;
FIG. 4 is a cross-sectional view of a retractable air bag folded at the side of a lithium battery case according to embodiment 2 of the present invention;
fig. 5 is a cross-sectional view showing the extension of a stretchable airbag of a lithium battery case with flame retardancy and heat dissipation according to example 2 of the present invention.
The figures are numbered:
1. go up casing, 2, louvre, 3, radiating groove, 4, division board, 5, go out the gas tank, 6, glass cover, 7, mounting hole, 8, bleeder vent, 9, scalable gasbag, 10, reaction unit spare, 11, the reservoir, 12, puncture piece, 13, counterweight, 14, spacing ring, 15, fastener, 16, the fastener groove, 17, conducting strip, 18, liquid reservoir, 19, positive plate, 20, negative pole piece, 21, first touch electric piece, 22, second touch electric piece, 23, the louvre.
The specific implementation mode is as follows:
the present invention will be described in detail below with reference to the accompanying drawings.
The ASA resin is a graft copolymer consisting of acrylate-styrene-acrylonitrile, wherein the mass of the acrylate accounts for 65% of that of the graft copolymer.
Example 1
As shown in fig. 1, fig. 2 and fig. 3, the technical solution adopted by the present invention is as follows:
a flame-retardant heat-dissipation lithium battery shell comprises an upper shell 1, wherein a plurality of strip-shaped heat dissipation holes 2 are formed in the upper shell, a heat dissipation groove 3 is formed in the upper shell, a partition plate 4 is arranged in the heat dissipation groove, an inner cavity of the heat dissipation groove above the partition plate is opposite to the heat dissipation holes, the bottom wall of the inner cavity of the heat dissipation groove below the partition plate is downwards sunken to form an air outlet groove 5, sodium azide is arranged in the air outlet groove, and a glass cover 6 is arranged at the top of the air outlet groove; the device comprises a partition plate, and is characterized in that a plurality of mounting holes 7 are formed in the partition plate, vent holes 8 are formed in the outer sides of the mounting holes, telescopic airbags 9 made of flame retardant materials are arranged above the vent holes, reaction components 10 are arranged in the mounting holes, each reaction component comprises a liquid storage bag 11 made of a fragile glass material, a puncturing piece 12 made of a ceramic material and located at the bottom of the liquid storage bag, and a counterweight piece 13 located at the top of the liquid storage bag, a limiting ring 14 made of a low-melting-point alloy with a melting point of 70 ℃ is arranged on the outer side of the counterweight piece, a clamping piece 15 is arranged at the top of the reaction component, a frustum-shaped clamping groove 16 is formed in the clamping piece, the outer surface of the limiting ring is matched with the clamping groove and used for preventing; and a water absorbing material is arranged on the side wall of the heat dissipation groove above the air outlet groove. The outer diameter of the middle part of the liquid storage bag is larger than the outer diameters of the two ends of the liquid storage bag. The water absorbing material of this embodiment may be a molecular sieve material, or a material such as calcium oxide.
The sodium azide of the present application may be a solid or a sodium azide solution, and the amount of the sodium azide added may be 0.01 to 1g, depending on the actual requirement. The sodium azide and sodium hypochlorite solution of the present patent application reacts as follows:
NaClO+2NaN3+H2O==NaCl+2NaOH+3N2↑。
when this embodiment was implemented, when ambient temperature reached with 70 ℃ for the spacing ring melts into liquid, the reaction unit tenesmus breaks the glass cover for the glass cover is broken and is made sodium azide and sodium hypochlorite solution reaction generate nitrogen gas, makes scalable gasbag extend and seals the louvre.
Example 2
As shown in fig. 4 and 5, the difference between the present embodiment 2 and the present embodiment 1 is that a conductive sheet 17 is installed at the top of the telescopic airbag, a liquid storage bag 18, in which a power transformation liquid is stored, is installed outside the heat sink, the liquid storage bag is used for separating the telescopic airbag, a positive plate 19 and a negative plate 20 are installed in the liquid storage bag, the positive plate is communicated with the positive electrode of the power supply through a conductive wire, a first contact piece 21 and a second contact piece 22 are installed in the upper shell, the negative plate is electrically connected to the first contact piece, and the second contact piece is electrically connected to the negative electrode of the power supply. The liquid storage bag is provided with a heat dissipation hole 23; the electro-rheological fluid of the embodiment adopts nano materials and silicone oil.
When this embodiment was implemented, when scalable gasbag extended to the top of radiating groove for first touch electric piece and second touch electric piece switch on the circuit are removed simultaneously to the conducting strip, make liquid in the liquid storage bag become fixed being used for fixed gasbag and then the design gasbag, avoid the air to contact the lithium cell in a large number.
Example 3
The difference between the embodiment 3 and the embodiment 1 is that the upper shell is made of the following raw materials in parts by weight: 50-60 parts of ASA resin, 36-38 parts of polymethyl methacrylate, 20-26 parts of polycarbonate, 12-14 parts of polyhexafluoroethylene, 8-10 parts of glass beads, 8-10 parts of flame retardant, 1-3 parts of toughening agent and 0.5-1 part of lubricant. 0.1-1 part of anti-dripping agent, and 0.5-2 parts of antioxidant. The flame retardant comprises tetrabromobisphenol A, decabromodiphenylethane, antimony trioxide and zinc borate. The lubricant is at least one of liquid paraffin, stearic acid amide, silicone oil or N, N-ethylene bis-stearic acid amide.
Example 4
The invention also discloses a preparation method of the flame-retardant heat-dissipation lithium battery shell, which comprises the following steps:
s1, putting the raw materials into a mixer, and mixing to obtain a mixed material;
and S2, feeding the mixed material prepared in the step S1 from a main feeding port of a double-screw extruder, feeding the flame retardant and the toughening agent from a side feeding port of the double-screw extruder, mixing, extruding and granulating.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings can be directly or indirectly applied to other related technical fields and are included in the scope of the present invention.
Claims (9)
1. The flame-retardant heat-dissipation lithium battery shell is characterized by comprising an upper shell, wherein a plurality of strip-shaped heat dissipation holes are formed in the upper shell, a heat dissipation groove is formed in the upper shell, a partition plate is arranged in the heat dissipation groove, an inner cavity of the heat dissipation groove above the partition plate is opposite to the heat dissipation holes, the bottom wall of the inner cavity of the heat dissipation groove below the partition plate is downwards sunken to form an air outlet groove, sodium azide is arranged in the air outlet groove, and a glass cover is arranged at the top of the air outlet groove; the reaction assembly comprises a liquid storage bag made of fragile glass materials, a puncturing piece made of ceramic materials and a counterweight piece positioned at the top of the liquid storage bag, wherein the reaction assembly is arranged in the mounting hole, the counterweight piece comprises a limiting ring made of low-melting-point alloy with a melting point of 70 ℃, a clamping piece is arranged at the top of the reaction assembly, a frustum-shaped clamping groove is formed in the clamping piece, the outer surface of the limiting ring is matched with the clamping groove and used for preventing the reaction assembly from falling down, and a sodium hypochlorite solution is arranged in the liquid storage bag;
when the outside temperature reaches 70 ℃, the limiting ring is fused into liquid, the reaction assembly falls down to break the glass cover, so that the glass cover is broken to enable the sodium azide and the sodium hypochlorite solution to react to generate nitrogen, and the telescopic air bag extends to seal the heat dissipation hole.
2. The lithium battery casing with flame retardant and heat dissipation of claim 1, wherein the side walls of the heat dissipation groove above the air outlet groove are provided with a water absorbing material.
3. The lithium battery casing with flame retardant and heat dissipation of claim 2, wherein the outer diameter of the middle portion of the reservoir is larger than the outer diameters of the two ends.
4. The lithium battery casing with flame retardance and heat dissipation as defined in claim 3, wherein a conductive sheet is mounted on the top of the stretchable air bag, a liquid storage bag with an electrical transformation liquid stored therein is disposed outside the heat dissipation groove, and the liquid storage bag is provided with heat dissipation holes; the liquid stores up the bag and is used for separating flexible gasbag be equipped with positive plate and negative pole piece in the liquid stores up the bag, the positive plate passes through the positive pole of conductor wire intercommunication power, be equipped with first electric touch piece and second electric touch piece in the upper shell, the first electric touch piece of negative pole piece electric connection, the second electric touch piece electric connection power's negative pole for when scalable gasbag extends the top that extends the radiating groove, make the conducting strip relieve first electric touch piece and second electric touch piece simultaneously and switch on the circuit, make liquid store up the interior liquid of bag and become fixedly be used for fixed gasbag and then design gasbag, avoid the air to contact the lithium cell in a large number.
5. The lithium battery casing with flame retardance and heat dissipation as defined in claim 1, 2, 3 or 4, wherein said upper casing is made of the following raw materials in parts by weight: 50-60 parts of ASA resin, 36-38 parts of polymethyl methacrylate, 20-26 parts of polycarbonate, 12-14 parts of polyhexafluoroethylene, 8-10 parts of glass beads, 8-10 parts of flame retardant, 1-3 parts of toughening agent and 0.5-1 part of lubricant.
6. The lithium battery casing with flame retardation and heat dissipation of claim 5, further comprising 0.1-1 part of anti-dripping agent, wherein the anti-dripping agent further comprises 0.5-2 parts of antioxidant.
7. The lithium battery case of claim 6, wherein the flame retardant comprises tetrabromobisphenol A, decabromodiphenylethane, antimony trioxide, and zinc borate.
8. The lithium battery case of claim 7, wherein the lubricant is selected from at least one of liquid paraffin, stearic acid amide, silicone oil, or N, N-ethylene bis stearic acid amide.
9. A method for manufacturing a lithium battery casing with flame retardancy and heat dissipation according to claim 8, comprising the steps of:
s1, putting the raw materials into a mixer, and mixing to obtain a mixed material;
and S2, feeding the mixed material prepared in the step S1 from a main feeding port of a double-screw extruder, feeding the flame retardant and the toughening agent from a side feeding port of the double-screw extruder, mixing, extruding and granulating.
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| CN202011500138.XA CN112563637B (en) | 2020-12-17 | 2020-12-17 | Flame-retardant heat-dissipation lithium battery shell and preparation method thereof |
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| CN202011500138.XA CN112563637B (en) | 2020-12-17 | 2020-12-17 | Flame-retardant heat-dissipation lithium battery shell and preparation method thereof |
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| CN112563637B CN112563637B (en) | 2022-10-04 |
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Cited By (4)
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| CN113314798A (en) * | 2021-06-07 | 2021-08-27 | 吴彼懋 | Explosion-proof battery |
| CN113594607A (en) * | 2021-07-14 | 2021-11-02 | 安徽众兴模具有限公司 | Flame-retardant battery shell |
| CN114006334A (en) * | 2021-11-24 | 2022-02-01 | 江苏康盛风电科技有限公司 | Fire-resistant waterproof bus duct |
| CN114668993A (en) * | 2022-05-27 | 2022-06-28 | 南通鼎城船舶技术有限公司 | Sealed fire-proof escape cabin door for ship |
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| CN114668993A (en) * | 2022-05-27 | 2022-06-28 | 南通鼎城船舶技术有限公司 | Sealed fire-proof escape cabin door for ship |
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