CN111900273A - Heat-dissipation waterproof composite lithium ion battery shell material and preparation method thereof - Google Patents
Heat-dissipation waterproof composite lithium ion battery shell material and preparation method thereof Download PDFInfo
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- CN111900273A CN111900273A CN202010687924.9A CN202010687924A CN111900273A CN 111900273 A CN111900273 A CN 111900273A CN 202010687924 A CN202010687924 A CN 202010687924A CN 111900273 A CN111900273 A CN 111900273A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 64
- 239000002131 composite material Substances 0.000 title claims abstract description 55
- 239000011257 shell material Substances 0.000 title claims abstract description 45
- 230000017525 heat dissipation Effects 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- -1 polypropylene Polymers 0.000 claims abstract description 63
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000004743 Polypropylene Substances 0.000 claims abstract description 36
- 229920001155 polypropylene Polymers 0.000 claims abstract description 36
- 239000002033 PVDF binder Substances 0.000 claims abstract description 28
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 28
- 239000004698 Polyethylene Substances 0.000 claims abstract description 27
- 229920000573 polyethylene Polymers 0.000 claims abstract description 27
- 239000000314 lubricant Substances 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000004793 Polystyrene Substances 0.000 claims description 28
- 229920002223 polystyrene Polymers 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 16
- 239000002041 carbon nanotube Substances 0.000 claims description 15
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 15
- 238000001125 extrusion Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000011261 inert gas Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000007480 spreading Effects 0.000 claims description 2
- 238000003892 spreading Methods 0.000 claims description 2
- 229920001169 thermoplastic Polymers 0.000 claims 2
- 239000004416 thermosoftening plastic Substances 0.000 claims 2
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 229920003023 plastic Polymers 0.000 description 35
- 239000004033 plastic Substances 0.000 description 35
- 230000000052 comparative effect Effects 0.000 description 15
- 239000000945 filler Substances 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 12
- 239000008116 calcium stearate Substances 0.000 description 12
- 235000013539 calcium stearate Nutrition 0.000 description 12
- 239000002048 multi walled nanotube Substances 0.000 description 12
- 229910052582 BN Inorganic materials 0.000 description 9
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 9
- 229910052581 Si3N4 Inorganic materials 0.000 description 8
- 239000011231 conductive filler Substances 0.000 description 8
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 8
- 229920005992 thermoplastic resin Polymers 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000416 bismuth oxide Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention relates to the technical field of preparation of battery shell materials, and particularly discloses a heat-dissipation waterproof composite lithium ion battery shell material and a preparation method thereof. The heat-dissipation waterproof composite lithium ion battery shell material comprises the following raw material components in parts by weight: 60-80 parts of polypropylene; 10-20 parts of polyvinylidene fluoride; 10-20 parts of polyethylene; 5-10 parts of modified carbon nanotubes; 3-5 parts of a lubricant. The composite lithium ion battery shell material provided by the invention has good insulativity, corrosion resistance and heat conductivity, and also has good waterproof performance.
Description
Technical Field
The invention relates to the technical field of preparation of battery shell materials, in particular to a heat-dissipation waterproof composite lithium ion battery shell material and a preparation method thereof.
Background
A lithium ion battery is a type of secondary battery that mainly operates by movement of lithium ions between a positive electrode and a negative electrode. In recent years, the application range of lithium ion batteries is becoming wider and wider, and lithium ion batteries are increasingly widely used in electric bicycles, electric motorcycles, electric automobiles and the like. With the wide application of lithium ion batteries, the demand for materials for the housing of lithium ion batteries is also increasing.
The commonly used lithium ion shell materials mainly comprise a steel shell material, an aluminum shell material and an aluminum-plastic shell material. However, the above-mentioned cases made of metal materials, such as the case material, have poor insulation treatment control, which is likely to cause short circuit of the lithium ion battery case and have electric shock and spontaneous combustion risks. As such, plastic materials for lithium ion battery casing materials have been produced. Although the plastic lithium ion battery shell material has good insulativity, the plastic lithium ion battery shell material also has the corrosion resistance and the heat conductivity; therefore, common plastics cannot be used for preparing the shell material of the lithium ion battery.
Chinese patent CN 102558654A discloses a composite plastic for preparing a lithium ion battery shell, which is prepared by taking polypropylene, polyvinylidene fluoride and polyethylene as plastic matrixes and adding heat-conducting fillers and the like; polypropylene, polyvinylidene fluoride and polyethylene are used as plastic matrixes, so that the insulativity and the corrosion resistance of the plastic are ensured; meanwhile, heat-conducting fillers such as aluminum oxide, boron nitride, silicon nitride and the like are added, so that the heat-conducting property of the plastic is ensured; the composite plastic can meet the requirements of lithium ion battery shells. However, in practical use, although the thermal conductivity of the lithium ion battery case material is improved, the waterproof performance is reduced, and after long-term use, the electrolyte leaks, and external moisture also enters the battery. However, how to solve the problem of maintaining the waterproof performance of the composite plastic while improving the thermal conductivity of the composite plastic is a problem which needs to be overcome by those skilled in the art.
Disclosure of Invention
The invention aims to solve the technical problem that the waterproof performance of composite plastic is reduced when the thermal conductivity is improved in the background art, and provides a heat-dissipation waterproof composite lithium ion battery shell material. The lithium ion battery shell material can not cause the reduction of the waterproof performance of the composite plastic while improving the heat conductivity of the composite plastic.
The technical problem to be solved by the invention is realized by the following technical scheme:
a heat-dissipation waterproof composite lithium ion battery shell material comprises the following raw material components in parts by weight:
60-80 parts of polypropylene; 10-20 parts of polyvinylidene fluoride; 10-20 parts of polyethylene; 5-10 parts of modified carbon nanotubes; 3-5 parts of a lubricant.
Preferably, the heat-dissipation waterproof composite lithium ion battery shell material comprises the following raw material components in parts by weight:
70-80 parts of polypropylene; 10-15 parts of polyvinylidene fluoride; 10-15 parts of polyethylene; 5-8 parts of modified carbon nanotubes; 3-4 parts of a lubricant.
Most preferably, the heat-dissipation waterproof composite lithium ion battery shell material comprises the following raw material components in parts by weight:
75 parts of polypropylene; 15 parts of polyvinylidene fluoride; 12 parts of polyethylene; 8 parts of modified carbon nanotubes; and 3 parts of a lubricant.
Preferably, the modified carbon nanotube is a carbon nanotube modified by a thermoplastic resin.
The inventor of the present invention has found that the composite plastic using polypropylene, polyvinylidene fluoride and polyethylene as plastic matrix has poor waterproof performance due to the addition of heat conductive filler such as alumina, boron nitride and silicon nitride. The composite plastic is added with the heat-conducting filler, so that the waterproof performance of the shell material of the lithium ion battery is poor, the electrolyte can leak after long-term use, and external moisture can also enter the battery. That is, the addition of the heat-conducting fillers such as alumina, boron nitride, silicon nitride and the like can improve the heat-conducting property of the composite plastic, but the waterproof property is correspondingly reduced. However, how to solve the technical problem that the waterproof performance of the composite plastic can be maintained while the thermal conductivity of the composite plastic is improved is a technical problem which is not overcome by the technical personnel in the field.
Based on the above findings, the inventors have surprisingly found, in a large number of experimental processes, that when carbon nanotubes modified with a thermoplastic resin are used in place of a thermally conductive filler such as alumina, boron nitride, silicon nitride, etc.; the technical problem that the waterproof performance of the composite plastic is reduced can be successfully solved. The carbon nano tube modified by the thermoplastic resin is a heat-conducting filler with excellent heat-conducting property, and the heat-conducting property of the composite plastic can be improved.
Further preferably, the carbon nanotubes modified by the thermoplastic resin are polypropylene-modified carbon nanotubes or polystyrene-modified carbon nanotubes.
The inventor further researches show that when the carbon nano tube modified by the thermoplastic resin is selected from the carbon nano tube modified by polypropylene or the carbon nano tube modified by polystyrene, the heat conductivity of the composite plastic is improved, and meanwhile, the waterproof performance is not reduced.
The polypropylene modified carbon nanotube or the polystyrene modified carbon nanotube can be prepared by grafting polypropylene and polystyrene onto the carbon nanotube by a conventional method or by the following method.
Preferably, the polypropylene modified carbon nanotube or the polystyrene modified carbon nanotube is prepared by the following method:
uniformly mixing polypropylene or polystyrene and carbon nanotubes, spreading, and performing ultraviolet irradiation for 30-60 min under inert gas.
Further preferably, the weight ratio of the polypropylene or the polystyrene to the carbon nano tube is 1-3: 1.
Further preferably, the tiling thickness is 2-4 mm.
Further preferably, the wavelength of the ultraviolet light is 210-230 nm, and the power is 20-30 mW.
The preparation method of the heat-dissipation waterproof composite lithium ion battery shell material specifically comprises the following steps: uniformly mixing polypropylene, polyvinylidene fluoride, polyethylene, modified carbon nanotubes and a lubricant, and then putting the mixture into a double-screw extruder for melt extrusion to obtain the heat-dissipation waterproof composite lithium ion battery shell material.
Has the advantages that: compared with the prior art, the composite lithium ion battery shell material has the advantages that the carbon nano tube modified by the thermoplastic resin added with the heat-conducting filler replaces the heat-conducting fillers such as aluminum oxide, boron nitride, silicon nitride and the like in the prior art; the technical problem that the waterproof performance of the composite plastic in the prior art is reduced can be successfully solved. The composite lithium ion battery shell material provided by the invention has good insulativity, corrosion resistance and heat conductivity of the existing composite plastic, and also has good waterproof performance.
Detailed Description
The present invention is further explained with reference to the following specific examples, which do not limit the scope of the present invention.
The polypropylene in the following examples is selected from the group consisting of Yanshan petrochemical polypropylene with the designation K1108; the polyvinylidene fluoride is selected from American Suwei under the trademark of 1015 polyvinylidene fluoride; the polyethylene is selected from high-density polyethylene with the mark of 2200J produced by Daqing petrochemical industry; the polystyrene is selected from polystyrene with the trademark PG-80 produced by Qimei company of Taiwan; the carbon nano tube is a multi-walled carbon nano tube and is selected from the multi-walled carbon nano tubes (the inner diameter is 2-5 nm, the outer diameter is 8nm, and the length is 10-30 mu m) which are produced by Shenzhen Shenzhong Sen Navigator science and technology Limited and named as GT-20Y.
Example 1 preparation of Heat-dissipating waterproof composite lithium ion Battery casing Material
The raw materials comprise the following components in parts by weight: 75 parts of polypropylene; 15 parts of polyvinylidene fluoride; 12 parts of polyethylene; 8 parts of polystyrene modified carbon nano tube; 3 parts of lubricant calcium stearate;
the polystyrene modified carbon nano tube is prepared by the following method: uniformly mixing polystyrene and multi-wall carbon nano tubes according to the mass ratio of 2:1, and then flatly paving (the thickness of the flat paving is 4 mm); then, under the protection of nitrogen, ultraviolet light with the power of 25mW and the wavelength of 216nm is adopted for irradiation for 20 min; and then uniformly mixing the polystyrene irradiated by the first ultraviolet light and the multi-wall carbon nano tube again, tiling, and repeating the ultraviolet light irradiation for 2 times under the same condition to obtain the polystyrene modified carbon nano tube.
The preparation method comprises the following steps: and weighing the polypropylene, the polyvinylidene fluoride, the polyethylene, the polystyrene modified carbon nano tube and the lubricant calcium stearate according to the weight parts, uniformly mixing, and putting into a double-screw extruder for melt extrusion to obtain the heat-dissipation waterproof composite lithium ion battery shell material.
Example 2 preparation of Heat-dissipating waterproof composite lithium ion Battery casing Material
The raw materials comprise the following components in parts by weight: 60 parts of polypropylene; 20 parts of polyvinylidene fluoride; 10 parts of polyethylene; 10 parts of polystyrene modified carbon nano tube; 3 parts of lubricant calcium stearate;
the polystyrene modified carbon nano tube is prepared by the following method: uniformly mixing polystyrene and multi-wall carbon nano tubes according to the mass ratio of 2:1, and then flatly paving (the thickness of the flat paving is 4 mm); then, under the protection of nitrogen, ultraviolet light with the power of 25mW and the wavelength of 216nm is adopted for irradiation for 20min, and then the irradiation is stopped; and then uniformly mixing the polystyrene and the multi-wall carbon nano tube again, tiling, and repeating the ultraviolet irradiation for 2 times under the same condition to obtain the polystyrene modified carbon nano tube.
The preparation method comprises the following steps: and weighing the polypropylene, the polyvinylidene fluoride, the polyethylene, the polystyrene modified carbon nano tube and the lubricant calcium stearate according to the weight parts, uniformly mixing, and putting into a double-screw extruder for melt extrusion to obtain the heat-dissipation waterproof composite lithium ion battery shell material.
Example 3 preparation of Heat-dissipating waterproof composite lithium-ion Battery casing Material
The raw materials comprise the following components in parts by weight: 80 parts of polypropylene; 10 parts of polyvinylidene fluoride; 20 parts of polyethylene; 5 parts of polystyrene modified carbon nano tube; 5 parts of lubricant calcium stearate;
the polystyrene modified carbon nano tube is prepared by the following method: uniformly mixing polystyrene and multi-wall carbon nano tubes according to the mass ratio of 2:1, and then flatly paving (the thickness of the flat paving is 4 mm); then, under the protection of nitrogen, ultraviolet light with the power of 25mW and the wavelength of 216nm is adopted for irradiation for 20min, and then the irradiation is stopped; and then uniformly mixing the polystyrene and the multi-wall carbon nano tube again, tiling, and repeating the ultraviolet irradiation for 2 times under the same condition to obtain the polystyrene modified carbon nano tube.
The preparation method comprises the following steps: and weighing the polypropylene, the polyvinylidene fluoride, the polyethylene, the polystyrene modified carbon nano tube and the lubricant calcium stearate according to the weight parts, uniformly mixing, and putting into a double-screw extruder for melt extrusion to obtain the heat-dissipation waterproof composite lithium ion battery shell material.
Comparative example 1
The raw materials comprise the following components in parts by weight: 75 parts of polypropylene; 15 parts of polyvinylidene fluoride; 12 parts of polyethylene; 3 parts of lubricant calcium stearate;
the preparation method comprises the following steps: and weighing the polypropylene, the polyvinylidene fluoride, the polyethylene and the lubricant calcium stearate according to the weight parts, uniformly mixing, and putting into a double-screw extruder for melt extrusion to obtain the lithium ion battery shell material.
The difference between the comparative example 1 and the example 1 is that the lithium ion battery shell material is prepared without adding a heat-conducting filler.
Comparative example 2
The raw materials comprise the following components in parts by weight: 75 parts of polypropylene; 15 parts of polyvinylidene fluoride; 12 parts of polyethylene; 8 parts of heat-conducting filler; 3 parts of lubricant calcium stearate;
the heat-conducting filler comprises the following components in parts by weight: 31 parts of aluminum nitride, 1 part of aluminum oxide, 5 parts of boron nitride, 7 parts of silicon nitride, 11 parts of silicon carbide, 43 parts of bismuth oxide and 2 parts of silane coupling agent.
The preparation method comprises the following steps: and weighing the polypropylene, the polyvinylidene fluoride, the polyethylene, the heat-conducting filler and the lubricant calcium stearate according to the weight parts, uniformly mixing, and putting into a double-screw extruder for melt extrusion to obtain the shell material of the lithium ion battery.
Comparative example 2 is different from example 1 in that a thermally conductive filler composed of aluminum nitride, aluminum oxide, boron nitride, etc. is used instead of the polystyrene-modified carbon nanotube of the present invention.
Comparative example 3 preparation of Heat-dissipating waterproof composite lithium ion Battery casing Material
The raw materials comprise the following components in parts by weight: 75 parts of polypropylene; 15 parts of polyvinylidene fluoride; 12 parts of polyethylene; 8 parts of multi-wall carbon nano tubes; 3 parts of lubricant calcium stearate;
the preparation method comprises the following steps: and weighing the polypropylene, the polyvinylidene fluoride, the polyethylene multi-walled carbon nanotube and the lubricant calcium stearate according to the weight parts, uniformly mixing, and putting into a double-screw extruder for melt extrusion to obtain the lithium ion battery shell material.
Comparative example 3 is different from example 1 in that multi-walled carbon nanotubes are directly used as a heat conductive filler without using polystyrene-modified carbon nanotubes as a heat conductive filler.
Examples of the experiments
The lithium ion battery shell materials prepared in the embodiments 1-3 and the comparative examples 1-3 are injected into a box body with a pipeline interface on one side wall, and the length, the width and the height of the box body are respectively 0.3 mx0.3mx0.1m; and filling water into the box body through the pipeline connector, applying pressure of 0.3MPa, keeping for 24 hours, and observing whether the side wall of the box body seeps water or not. Specific results are shown in table 1.
TABLE 1 Water resistance test of materials
| Test material | Whether it is permeable to water | |
| 1 | Example 1 lithium ion Battery casing Material | Is impervious to water |
| 2 | Example 2 lithium ion Battery casing Material | Is impervious to water |
| 3 | Example 3 lithium ion Battery casing Material | Is impervious to water |
| 4 | Comparative example 1 lithium ion Battery casing Material | Is impervious to water |
| 5 | Comparative example 2 lithium ion Battery casing Material | Permeable to water |
| 6 | Comparative example 3 lithium ion Battery casing Material | Permeable to water |
As can be seen from table 1, comparative example 1 and comparative example 2, the lithium ion battery case material prepared in comparative example 1 was impermeable, and the lithium ion battery case material prepared in comparative example 2 was permeable; this shows that the waterproof performance of the composite plastic is reduced by adding the heat conductive fillers such as alumina, boron nitride, silicon nitride and the like into the composite plastic taking polypropylene, polyvinylidene fluoride and polyethylene as the plastic matrix.
The lithium ion battery shell materials in the embodiments 1 to 3 are impermeable to water, which shows that the problem of the decrease of the waterproof performance of the composite plastic taking polypropylene, polyvinylidene fluoride and polyethylene as the plastic matrix after the composite plastic is added with the common heat-conducting filler can be solved by adopting the thermoplastic resin modified carbon nanotube to replace the heat-conducting fillers such as alumina, boron nitride, silicon nitride and the like.
In addition, the lithium ion battery shell material of comparative example 3 directly added with the multi-walled carbon nanotube as the heat conductive filler also has the water permeation phenomenon. This indicates that the carbon nanotubes modified by the thermoplastic resin of the present invention must be used as the thermal conductive filler to improve the thermal conductivity of the composite plastic and ensure that the water resistance of the composite plastic is not reduced.
Claims (10)
1. The heat-dissipation waterproof composite lithium ion battery shell material is characterized by comprising the following raw material components in parts by weight:
60-80 parts of polypropylene; 10-20 parts of polyvinylidene fluoride; 10-20 parts of polyethylene; 5-10 parts of modified carbon nanotubes; 3-5 parts of a lubricant.
2. The heat-dissipation waterproof composite lithium ion battery shell material according to claim 1, characterized by comprising the following raw material components in parts by weight:
70-80 parts of polypropylene; 10-15 parts of polyvinylidene fluoride; 10-15 parts of polyethylene; 5-8 parts of modified carbon nanotubes; 3-4 parts of a lubricant.
3. The heat-dissipation waterproof composite lithium ion battery shell material according to claim 1, characterized by comprising the following raw material components in parts by weight:
75 parts of polypropylene; 15 parts of polyvinylidene fluoride; 12 parts of polyethylene; 8 parts of modified carbon nanotubes; and 3 parts of a lubricant.
4. The heat-dissipating waterproof composite lithium ion battery casing material of claim 1, wherein the modified carbon nanotubes are thermoplastic resin-modified carbon nanotubes.
5. The heat-dissipating waterproof composite lithium ion battery casing material of claim 4, wherein the thermoplastic resin-modified carbon nanotubes are polypropylene-modified carbon nanotubes or polystyrene-modified carbon nanotubes.
6. The heat-dissipation waterproof composite lithium ion battery shell material according to claim 5, wherein the polypropylene-modified carbon nanotubes or polystyrene-modified carbon nanotubes are prepared by the following method:
uniformly mixing polypropylene or polystyrene and carbon nanotubes, spreading, and performing ultraviolet irradiation for 30-60 min under inert gas.
7. The heat-dissipation waterproof composite lithium ion battery shell material according to claim 6, wherein the weight usage ratio of polypropylene or polystyrene to the carbon nanotubes is 1-3: 1.
8. The heat-dissipation waterproof composite lithium ion battery shell material according to claim 6, wherein the tiling thickness is 2-4 mm.
9. The heat-dissipation waterproof composite lithium ion battery shell material according to claim 6, wherein the wavelength of ultraviolet light is 210-230 nm, and the power is 20-30 mW.
10. The preparation method of the heat-dissipation waterproof composite lithium ion battery shell material as claimed in any one of claims 1 to 9, wherein the heat-dissipation waterproof composite lithium ion battery shell material is obtained by uniformly mixing polypropylene, polyvinylidene fluoride, polyethylene, modified carbon nanotubes and a lubricant, and then putting the mixture into a double-screw extruder for melt extrusion.
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