CN115674740A - Preparation method and preparation device of lithium ion battery diaphragm - Google Patents
Preparation method and preparation device of lithium ion battery diaphragm Download PDFInfo
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- CN115674740A CN115674740A CN202211518154.0A CN202211518154A CN115674740A CN 115674740 A CN115674740 A CN 115674740A CN 202211518154 A CN202211518154 A CN 202211518154A CN 115674740 A CN115674740 A CN 115674740A
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- stretching
- ion battery
- lithium ion
- inner cavity
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 27
- 239000002904 solvent Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000006138 lithiation reaction Methods 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 239000011230 binding agent Substances 0.000 claims abstract description 15
- 239000003292 glue Substances 0.000 claims abstract description 15
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 13
- 239000002270 dispersing agent Substances 0.000 claims abstract description 12
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002562 thickening agent Substances 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 7
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 7
- -1 polyoxyethylene Polymers 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 4
- 239000002033 PVDF binder Substances 0.000 claims abstract description 4
- 150000001346 alkyl aryl ethers Chemical class 0.000 claims abstract description 4
- 150000002191 fatty alcohols Chemical class 0.000 claims abstract description 4
- 229920000642 polymer Polymers 0.000 claims abstract description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 4
- 239000011734 sodium Substances 0.000 claims abstract description 4
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 4
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims abstract description 4
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims abstract description 3
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims abstract description 3
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims abstract description 3
- 230000000670 limiting effect Effects 0.000 claims description 57
- 230000007246 mechanism Effects 0.000 claims description 34
- 239000007921 spray Substances 0.000 claims description 20
- 230000008878 coupling Effects 0.000 claims description 16
- 238000010168 coupling process Methods 0.000 claims description 16
- 238000005859 coupling reaction Methods 0.000 claims description 16
- 230000001681 protective effect Effects 0.000 claims description 15
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000000576 coating method Methods 0.000 claims description 13
- 238000003825 pressing Methods 0.000 claims description 13
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 12
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical group CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 9
- 238000004804 winding Methods 0.000 claims description 9
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 6
- 230000000712 assembly Effects 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 6
- 239000006255 coating slurry Substances 0.000 claims description 6
- 239000006258 conductive agent Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 6
- 229910052744 lithium Inorganic materials 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 6
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 5
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 5
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 5
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 5
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 5
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 claims description 5
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000011149 active material Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 3
- 229920002319 Poly(methyl acrylate) Polymers 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-M acrylate group Chemical group C(C=C)(=O)[O-] NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229910021389 graphene Inorganic materials 0.000 claims description 3
- IDBFBDSKYCUNPW-UHFFFAOYSA-N lithium nitride Chemical compound [Li]N([Li])[Li] IDBFBDSKYCUNPW-UHFFFAOYSA-N 0.000 claims description 3
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 claims description 3
- HPGPEWYJWRWDTP-UHFFFAOYSA-N lithium peroxide Chemical compound [Li+].[Li+].[O-][O-] HPGPEWYJWRWDTP-UHFFFAOYSA-N 0.000 claims description 3
- GLNWILHOFOBOFD-UHFFFAOYSA-N lithium sulfide Chemical compound [Li+].[Li+].[S-2] GLNWILHOFOBOFD-UHFFFAOYSA-N 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000012982 microporous membrane Substances 0.000 claims description 3
- 239000012046 mixed solvent Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- RAYLUPYCGGKXQO-UHFFFAOYSA-N n,n-dimethylacetamide;hydrate Chemical compound O.CN(C)C(C)=O RAYLUPYCGGKXQO-UHFFFAOYSA-N 0.000 claims description 3
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 3
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 3
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 2
- 239000000230 xanthan gum Substances 0.000 claims description 2
- 229920001285 xanthan gum Polymers 0.000 claims description 2
- 235000010493 xanthan gum Nutrition 0.000 claims description 2
- 229940082509 xanthan gum Drugs 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 9
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- 239000012790 adhesive layer Substances 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
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Images
Classifications
-
- 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
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses a preparation method and a preparation device of a lithium ion battery diaphragm, which comprises a base film, wherein the raw material of the base film comprises a dispersing agent, a glue layer main body material, a thickening agent, a binder, a lithiation material and a solvent; the dispersing agent comprises any one or the combination of at least two of polymers, fatty alcohols, polyethylene glycol alkyl aryl ether sodium sulfonate, alkylphenol polyethenoxy ether, polyoxyethylene alkyl phenol ether or sodium polyacrylate, and the main material of the glue layer is a polar substance; the glue layer main body material comprises polyvinylidene fluoride. The preparation method of the lithium ion battery diaphragm improves the heat exchange stability of the lithium ion battery diaphragm, and can perform bidirectional asynchronous stretching in the preparation method of the lithium ion battery diaphragm, and the elastic film is subjected to auxiliary heating in the stretching process, so that the stretched elastic film is slightly heated and cured, the elastic shrinkage amplitude is prevented from being too large, and the stretching effect is reduced.
Description
Technical Field
The invention relates to the technical field of lithium battery diaphragm processing, in particular to a preparation method and a preparation device of a lithium ion battery diaphragm.
Background
In the construction of lithium batteries, the separator is one of the key internal components. The performance of the diaphragm determines the interface structure, internal resistance and the like of the battery, the characteristics of the battery such as capacity, circulation, safety performance and the like are directly influenced, the diaphragm with excellent performance has an important function of improving the comprehensive performance of the battery, the main function of the diaphragm is to separate the positive electrode and the negative electrode of the battery and prevent the two electrodes from being contacted and short-circuited, in addition, the diaphragm also has the function of enabling electrolyte ions to pass through, the diaphragm is non-conductive, the physical and chemical properties of the diaphragm have great influence on the performance of the battery, the types of the batteries are different, the adopted diaphragms are also different, and for lithium battery series, as the electrolyte is an organic solvent system, the diaphragm material resistant to organic solvents is required, and a high-strength thinned polyolefin porous membrane is generally adopted;
in the prior art, most of diaphragms applied to batteries are still microporous polyolefin films made of polyethylene or polypropylene, and the premise that the internal temperature of the battery is increased and the diaphragms are likely to shrink or soften is that the battery is in an abnormal working state or the external temperature is higher than that of the battery, and the battery is in an environment of 120 ℃ and is directly short-circuited inside the battery, so that safety accidents such as fire or explosion are likely to occur, and the film is shrunk due to the elasticity of the film in the process of stretching the film by using the existing stretching device, so that the stretching effect is affected, and therefore, a preparation method of the lithium ion battery diaphragm and the stretching and bidirectional asynchronous stretching device are urgently needed to solve the problems.
Disclosure of Invention
The invention aims to provide a preparation method and a preparation device of a lithium ion battery diaphragm, which aim to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of a lithium ion battery separator comprises the following steps: the base film comprises a dispersing agent, a glue layer main body material, a thickening agent, a binder, a lithiation material and a solvent;
the adhesive layer comprises a glue layer main material and a dispersing agent, wherein the dispersing agent comprises any one or combination of at least two of polymers, fatty alcohols, polyethylene glycol alkyl aryl ether sodium sulfonate, alkylphenol polyethenoxy ether, polyoxyethylene alkylphenol ether and sodium polyacrylate, and the glue layer main material is a polar substance;
the glue layer main body material comprises polyvinylidene fluoride;
the thickening agent comprises any one or the combination of at least two of polyvinyl alcohol, polyethylene glycol, polyvinylpyrrolidone and sodium carboxymethylcellulose;
the binder comprises any one or the combination of at least two of polyacrylonitrile, epoxy resin, polymethyl acrylate, styrene butadiene rubber or xanthan gum;
the lithiation material comprises 9-69 parts of pre-lithiation active material, 3-9 parts of solvent, 0.5-1.5 parts of binder and 0.5-1.5 parts of conductive agent, wherein the pre-lithiation active material is one or more of lithium dioxide, lithium monoxide, lithium sulfide, lithium nitride and lithium manganate, the solvent is ethyl acetate, dimethyl carbonate and diethyl carbonate, the binder is acrylate and sodium carboxymethyl cellulose, and the conductive agent is graphene;
the solvent comprises any one of N-methyl pyrrolidone, dimethylacetamide, dimethylformamide, triethyl phosphate or dimethyl sulfoxide or a combination of at least two of the N-methyl pyrrolidone, the dimethylacetamide, the dimethylformamide and the triethyl phosphate;
the weight parts of the dispersing agent, the glue layer main body material, the thickening agent, the binder, the lithiation material and the solvent in the base film are 0.5 part, 1-4 parts, 3 parts, 1.5 parts and 2.5-90 parts;
a modification layer attached to one or both sides of the base film, the modification layer comprising: alumina powder (2 nm-4nm grade) and poly-lithium 4-styrene.
The method comprises the following steps:
the method comprises the following steps: preparing a base film raw material, mixing the base film raw material according to a formula, and conveying the base film raw material to an extrusion system;
step two: casting, namely, melting and plasticizing the pre-mixed raw materials in an extrusion system, and then extruding a melt from a die head, wherein the melt forms a base film with a specific crystalline structure after casting;
step three: heat treatment, the base film is subjected to heat treatment to obtain a hard elastic film;
step four: preparing a modified layer coating, and putting raw materials of the modified layer coating into a reactor according to a formula, wherein the volume ratio of the raw materials is 5:95 of water and N-dimethylacetamide mixed solvent, and dispersing to prepare coating slurry;
step five: coating the two sides of the base film with the coating slurry, standing for 10 minutes in an indoor drying environment after coating to naturally evaporate the solvent, changing the external environment, and drying for 24 hours in a vacuum environment at 70-90 ℃ to obtain a film;
step six: performing bidirectional asynchronous stretching, namely performing cold stretching and hot stretching on the elastic film by using the bidirectional asynchronous stretching respectively to form a nano microporous film;
step seven: and cutting the nano microporous membrane into a finished membrane according to the specification requirements of customers.
According to the sixth step, a device for preparing a lithium ion battery separator is provided, which is used for performing bidirectional asynchronous stretching and comprises:
a base;
the transverse stretching mechanism is arranged on the front side of the base;
the protective cover is arranged at the top of the transverse stretching mechanism;
the control terminal is embedded in the outer wall of the protective cover;
the longitudinal stretcher is arranged on the rear side of the top end of the base and is electrically connected with the control terminal;
and the winding machine is arranged on the front side of the transverse stretching mechanism and electrically connected with the control terminal.
Preferably, the transverse stretching mechanism includes: the device comprises a transverse stretching mechanism shell, a limiting compression roller, a lifting module, a heat auxiliary assembly, an adjustable mounting frame, an annular conveying module, a double-shaft moving module, a stretching clamping unit and a tensioning conveying module; the transverse stretching mechanism shell is arranged in front of the base along the front-back direction, and the protective cover is arranged at the top of the transverse stretching mechanism shell; the limiting compression roller is arranged in the middle of the rear side of the top end of the shell of the transverse stretching mechanism; the number of the lifting modules is two, the two lifting modules are respectively arranged on the front side and the rear side of an opening at the top end of the shell of the transverse stretching mechanism, and the lifting modules are electrically connected with the control terminal; the number of the heat auxiliary assemblies is two, and the two heat auxiliary assemblies are respectively arranged at the top ends of the front lifting module and the rear lifting module; the adjustable mounting rack is arranged at the top end of the inner cavity of the protective cover along the front-back direction; the number of the annular conveying modules is two, the two annular conveying modules are respectively arranged on the left side and the right side of the adjustable mounting frame along the front-back direction, and the annular conveying modules are electrically connected with the control terminal; the number of the double-shaft moving modules is two, the number of the double-shaft moving modules in each group is three, the two groups of double-shaft moving modules are respectively arranged on the outer sides of the left annular conveying module and the right annular conveying module at intervals, and the double-shaft moving modules are electrically connected with the control terminal; the number of the stretching clamping units is two, the number of each group of stretching clamping units is three, and the two groups of stretching clamping units are respectively arranged at the moving ends of the two groups of biaxial moving modules; the tensioning and conveying module is arranged on the front side of the top end of the shell of the transverse stretching mechanism and is electrically connected with the control terminal.
Preferably, the heat assist assembly comprises: the hot auxiliary assembly comprises a shell, a limiting groove, an annular seat, a rack, a hot air spray head, an inner gear ring and a driven gear rod; the heat auxiliary assembly shell is arranged at the lifting end of the lifting module; the number of the limiting grooves is a plurality, and the limiting grooves are arranged at the top end of the inner cavity of the heat auxiliary component shell at intervals along the circumferential direction; the annular seat is arranged in the inner cavity of the heat auxiliary assembly shell through a bracket; the number of the racks is a plurality, and the racks are inserted at intervals on the top of the annular seat along the circumferential direction; the number of the hot air spray heads is a plurality, the hot air spray heads are circumferentially arranged on the inner sides of the top ends of the racks at intervals, the top ends of the hot air spray heads extend out of the upper surface of the shell of the heat auxiliary assembly from the inner cavity of the limiting groove, and the hot air spray heads are electrically connected with the control terminal; the inner gear ring is rotatably connected to the inner side of the annular seat through a bearing; the quantity of driven gear pole is a plurality of, a plurality of driven gear pole rotates through the round pin axle along circumference interval and connects on the inner wall top of heat-assisted subassembly shell, a plurality of driven gear pole's outer wall bottom and the inside meshing of internal gear ring, a plurality of driven gear pole's outer wall top meshes with a plurality of rack respectively.
Preferably, the heat assist assembly further comprises: the device comprises a rotating disc, an annular limiting groove, a semi-annular rack, a bottom frame, a universal coupling, a first motor, a guide rail frame, a limiting slide block and a gear; the rotating disc is arranged at the bottom end of the inner gear ring; the annular limiting groove is formed in the bottom end of the rotating disc; the semi-annular rack is arranged on the lower surface of the rotating disc and is positioned on the inner side of the annular limiting groove; the chassis is arranged on the right side of the inner cavity of the heat auxiliary assembly shell; one end of the universal coupling is rotatably connected to the top end of the underframe through a pin shaft; the first motor is arranged at the bottom end of the bottom frame, the output end of the first motor is fixedly connected with the axis of the universal coupling, and the first motor is electrically connected with the control terminal; the guide rail frame is arranged in the inner cavity of the shell of the heat auxiliary assembly along the left-right direction and is positioned above the bottom frame; the limiting slide block is inserted in the outer wall of the guide rail frame, the axis of the other side of the universal coupling is rotatably connected with the bottom end of the limiting slide block through a bearing, and the top end of the axis of the limiting slide block extends out of the upper surface of the limiting slide block and is inserted in the inner cavity of the annular limiting groove; the gear key is connected with the top end bearing of the limiting sliding block and meshed with the outer side of the semi-annular rack.
Preferably, the stretch clamping unit includes: the device comprises a stretching clamping unit shell, a turntable with a pin, a bevel gear set, a second motor, a slot seat, an inserted link, a connecting seat, a mounting seat, a rotary seat, an auxiliary fixing unit, a connecting rod and a sliding groove; the stretching clamping unit shell is arranged on the inner side of the moving end of the double-shaft moving module; the rotating disc with the pin is rotatably connected to the top end of the inner cavity of the stretching and clamping unit shell through a pin shaft; one end of the conical gear set is in keyed connection with the outer side of the axis of the rotating disc with the pin; the second motor is arranged in the inner cavity of the stretching and clamping unit shell and is electrically connected with the control terminal; the slot seat is arranged at the bottom end of the inner cavity of the shell of the stretching clamping unit; the inserting rod is inserted in the inner cavity of the slot seat; the connecting seat is in interference fit with the inner side of the outer side of the inserted rod; the number of the mounting seats is two, and the two mounting seats are respectively arranged on the upper side and the lower side of the inner end of the outer wall of the stretching and clamping unit shell; the number of the rotating seats is two, the two rotating seats are respectively and rotatably connected to the inner sides of the upper mounting seat and the lower mounting seat through pin shafts, and two ends of the connecting seat are respectively and rotatably connected with the inner sides of the two rotating seats through pin shafts; the number of the auxiliary fixing units is two, and the two auxiliary fixing units are respectively arranged at the inner ends of the upper rotating seat and the lower rotating seat; one end of the connecting rod is rotatably connected to the outer end of the inserted rod through a pin shaft; the spout is seted up the top of connecting rod, the inner chamber grafting of taking round pin carousel and spout.
Preferably, the auxiliary fixing unit includes: the auxiliary fixing unit comprises a shell, a slot, a micro motor, a rotating seat, a pressing block and a sliding groove seat; the auxiliary fixing unit shell is arranged at the inner end of the rotating seat along the front-back direction; the number of the slots is a plurality, and the slots are respectively arranged on the inner side of the inner cavity of the auxiliary fixing unit shell from front to back in a clearance manner; the number of the micro motors is a plurality, the micro motors are respectively arranged in the inner cavity of the auxiliary fixing unit shell and positioned on the outer sides of the slots, and the micro motors are electrically connected with the control terminal; the number of the rotating seats is a plurality, and a plurality of rotating seat screws are connected to the output ends of a plurality of micro motors; the number of the pressing blocks is a plurality, and the pressing blocks are respectively inserted into the inner cavities of the slots; the number of the chute seats is a plurality of, the chute seats are respectively arranged at the outer ends of the pressing blocks, and the inner sides of the chute seats are sleeved with the rotating seats.
Compared with the prior art, the invention has the beneficial effects that:
1. the elastic film is longitudinally stretched through a longitudinal stretcher, the second motor drives the bevel gear set to rotate and enables the rotating disc with the pins to circumferentially rotate, the connecting rod is driven to drive the inserting rod to move under the cooperation of the sliding groove, the inserting rod drives the rotating seat to drive the auxiliary fixing units to inwardly rotate and clamp and fix the upper surface and the lower surface of the elastic film under the cooperation of the connecting seat, the micro motors in the upper auxiliary fixing unit and the lower auxiliary fixing unit drive the rotating seat to rotate in the inner cavity of the sliding groove seat, so that the pressing blocks extend out from the inner cavity of the inserting groove to inwardly clamp the elastic film at fixed points under the cooperation of the sliding groove seat, stable clamping is kept in the subsequent stretching process, and the double-shaft moving module drives the stretching and clamping units to horizontally move so as to transversely stretch the elastic film under the cooperation of the stretching and clamping units;
2. in the process of transversely stretching the elastic film, the first motor drives the universal coupling to rotate, the gear moves circumferentially along the outer part of the semi-annular rack, the semi-annular rack drives the rotating disc to drive the inner gear ring to rotate intermittently clockwise or anticlockwise under the action of gear rotating force, the driven gear rod drives the rack to drive the hot air nozzle to reciprocate inside and outside under the action of the rotating force of the inner gear ring, hot air is sprayed from the hot air nozzle to perform auxiliary heating on the elastic film in the transverse stretching process, so that the stretched elastic film is slightly heated and cured, and the elastic shrinkage amplitude of the stretched elastic film is prevented from being too large;
therefore, the preparation method of the lithium ion battery diaphragm can realize bidirectional asynchronous stretching, and the elastic film can be heated in an auxiliary manner in the stretching process, so that the stretched elastic film is slightly heated and cured, the overlarge elastic shrinkage amplitude is avoided, and the stretching effect is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a biaxial asynchronous stretching device for a preparation method of a lithium ion battery diaphragm of the invention;
FIG. 2 is an exploded view of the transverse tension mechanism of FIG. 1 in accordance with the present invention;
FIG. 3 is an exploded view of the heat assist assembly of FIG. 2 in accordance with the present invention;
FIG. 4 is a bottom schematic view of the turn disc of FIG. 3 of the present invention;
FIG. 5 is an exploded view of the tension clamp unit of FIG. 2 in accordance with the present invention;
fig. 6 is an exploded view of the auxiliary fixing unit of fig. 5 according to the present invention.
In the figure: 1. a base; 2. a transverse stretching mechanism; 21. a transverse stretching mechanism housing; 22. limiting the compression roller; 23. a lifting module; 24. an adjustable mounting bracket; 25. an annular delivery module; 26. a biaxial movement module; 27. tensioning the conveying module; 3. a heat assist assembly; 31. a thermal assist assembly housing; 32. a limiting groove; 33. an annular seat; 34. a rack; 35. a hot air shower nozzle; 36. an inner gear ring; 37. a driven gear lever; 38. rotating the disc; 39. an annular limiting groove; 310. a semi-annular rack; 311. a chassis; 312. a universal coupling; 313. a first motor; 314. a guide rail bracket; 315. a limiting slide block; 316. a gear; 4. a stretching clamping unit; 41. stretching the clamping unit housing; 42. a turntable with a pin; 43. a bevel gear set; 44. a second motor; 45. a socket base; 46. inserting a rod; 47. a connecting seat; 48. a mounting base; 49. a rotating base; 410. a connecting rod; 411. a chute; 5. an auxiliary fixing unit; 51. an auxiliary fixing unit housing; 52. a slot; 53. a micro motor; 54. a rotating seat; 55. a compression block; 56. a chute seat; 6. a protective cover; 7. a control terminal; 8. a longitudinal stretcher; 9. and (7) a winding machine.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
the dispersing agent is a combination of a polymer, fatty alcohols, polyethylene glycol alkyl aryl ether sodium sulfonate and alkylphenol polyethenoxy ether, and the main material of the adhesive layer is a polar substance;
the glue layer main body material comprises polyvinylidene fluoride;
the thickening agent is a combination of polyvinyl alcohol, polyethylene glycol and polyvinylpyrrolidone;
the adhesive is the combination of polyacrylonitrile, epoxy resin and polymethyl acrylate;
the lithiation material comprises 45 parts of a pre-lithiation active substance, 5 parts of a solvent, 1 part of a binder and 1 part of a conductive agent, wherein the pre-lithiation active substance is a combination of lithium dioxide, lithium monoxide, lithium sulfide and lithium nitride, the solvent is a combination of ethyl acetate, dimethyl carbonate and diethyl carbonate, the binder is acrylate and sodium carboxymethyl cellulose, and the conductive agent is graphene;
the solvent is a combination of N-methyl pyrrolidone, dimethylacetamide and triethyl phosphate;
the weight portions of the dispersing agent, the glue line main body material, the thickening agent, the binder, the lithiation material and the solvent in the base film are 0.5 portion, 3 portions, 1.5 portions and 50 portions.
the method comprises the following steps: preparing a base film raw material, mixing the base film raw material according to a formula, and conveying the mixture to an extrusion system;
step two: casting, namely, melting and plasticizing the pre-mixed raw materials in an extrusion system, and then extruding a melt from a die head, wherein the melt forms a base film with a specific crystalline structure after casting;
step three: heat treatment, the basal membrane is subjected to heat treatment to obtain a hard elastic film;
step four: preparing a modified layer coating, wherein the modified layer coating is prepared by putting raw materials of the modified layer coating according to a formula, wherein the volume ratio is 5:95 of water and N-dimethylacetamide mixed solvent, and dispersing to prepare coating slurry;
step five: coating the two sides of the base film with the coating slurry, standing for 10 minutes in an indoor drying environment after coating to naturally evaporate the solvent, changing the external environment, and drying for 24 hours in a vacuum environment at 90 ℃ to obtain a film;
step six: performing bidirectional asynchronous stretching, namely performing cold stretching and hot stretching on the elastic film by using the bidirectional asynchronous stretching respectively to form a nano microporous film;
step seven: and cutting the nano microporous membrane into a finished membrane according to the specification requirement of a customer.
Example 3, referring to fig. 1 to 6, there is provided an apparatus for preparing a lithium ion battery separator, which is used for biaxial asynchronous stretching, comprising: the device comprises a base 1, a transverse stretching mechanism 2, a protective cover 6, a control terminal 7, a longitudinal stretcher 8 and a winding machine 9; the transverse stretching mechanism 2 is arranged on the front side of the base 1; the protective cover 6 is arranged at the top of the transverse stretching mechanism 2, and an alarm module, a visual detection module and the like can be additionally arranged inside and outside the protective cover 6 as required; the control terminal 7 is embedded in the outer wall of the protective cover 6, and the control terminal 7 can be manually controlled by workers or controlled by internally presetting a logic program; the longitudinal stretcher 8 is arranged on the rear side of the top end of the base 1, the longitudinal stretcher 8 is electrically connected with the control terminal 7, and the longitudinal stretcher 8 can be controlled by the control terminal 7 to longitudinally stretch the elastic film; the winding machine 9 is arranged on the front side of the transverse stretching mechanism 2, the winding machine 9 is electrically connected with the control terminal 7, and the winding machine 9 can control the elastic film subjected to bidirectional stretching to be wound through the control terminal 7.
Preferably, the transverse stretching mechanism 2 further comprises: the device comprises a transverse stretching mechanism shell 21, a limiting compression roller 22, a lifting module 23, a heat auxiliary assembly 3, an adjustable mounting frame 24, an annular conveying module 25, a double-shaft moving module 26, a stretching clamping unit 4 and a tensioning conveying module 27; the transverse stretching mechanism shell 21 is arranged in front of the base 1 along the front-back direction, and the protective cover 6 is arranged at the top of the transverse stretching mechanism shell 21; the limiting compression roller 22 is arranged in the middle of the rear side of the top end of the transverse stretching mechanism shell 21, and the limiting compression roller 22 is used for limiting and compressing the longitudinally stretched elastic film; the number of the lifting modules 23 is two, the two lifting modules 23 are respectively arranged on the front side and the rear side of the opening at the top end of the transverse stretching mechanism shell 21, the lifting modules 23 are electrically connected with the control terminal 7, the lifting modules 23 can be controlled by the control terminal 7, and the lifting modules 23 can drive the heat auxiliary assembly 3 to lift to a specified height position; the number of the heat auxiliary assemblies 3 is two, and the two heat auxiliary assemblies 3 are respectively arranged at the top ends of the front lifting module 23 and the rear lifting module 23; the adjustable mounting frame 24 is arranged at the top end of the inner cavity of the protective cover 6 along the front-back direction; the number of the annular conveying modules 25 is two, the two annular conveying modules 25 are respectively arranged on the left side and the right side of the adjustable mounting frame 24 along the front-back direction, the annular conveying modules 25 are electrically connected with the control terminal 7, the annular conveying modules 25 can be controlled by the control terminal 7, and the annular conveying modules 25 on the two sides can drive the two groups of double-shaft moving modules 26 to move circumferentially so as to realize continuous stretching; the number of the double-shaft moving modules 26 is two, the number of each double-shaft moving module 26 is three, the two double-shaft moving modules 26 are respectively arranged at the outer sides of the left annular conveying module 25 and the right annular conveying module 25 in a clearance mode, the double-shaft moving modules 26 are electrically connected with the control terminal 7, the double-shaft moving modules 26 can be controlled through the control terminal 7, and the double-shaft moving modules 26 can drive the stretching clamping unit 4 to move in the double-shaft direction; the number of the stretching clamping units 4 is two, the number of each group of stretching clamping units 4 is three, and the two groups of stretching clamping units 4 are respectively arranged at the moving ends of the two groups of biaxial moving modules 26; the tensioning and conveying module 27 is arranged on the front side of the top end of the transverse stretching mechanism shell 21, the tensioning and conveying module 27 is electrically connected with the control terminal 7, the tensioning and conveying module 27 can be controlled by the control terminal 7, and the tensioning and conveying module 27 conveys the stretched elastic film.
As a preferred solution, further, as shown in fig. 3 and 4, the heat assist assembly 3 includes: the heat auxiliary assembly comprises a heat auxiliary assembly shell 31, a limit groove 32, an annular seat 33, a rack 34, a hot air spray nozzle 35, an internal gear ring 36, a driven gear rod 37, a rotating disc 38, an annular limit groove 39, a semi-annular rack 310, a bottom frame 311, a universal coupling 312, a first motor 313, a guide rail frame 314, a limit sliding block 315 and a gear 316; the thermal assist assembly housing 31 is mounted at the lift end of the lift module 23; the number of the limiting grooves 32 is a plurality, and the plurality of limiting grooves 32 are arranged at the top end of the inner cavity of the heat auxiliary component shell 31 at intervals along the circumferential direction; the annular seat 33 is arranged in the inner cavity of the heat assist assembly housing 31 by a bracket; the number of the racks 34 is a plurality, the racks 34 are inserted at intervals at the top of the annular seat 33 along the circumferential direction, and the racks 34 can move inwards and outwards under the limiting effect of the annular seat 33; the number of the hot air spray heads 35 is a plurality, the hot air spray heads 35 are circumferentially arranged on the inner sides of the top ends of the racks 34 at intervals, the top ends of the hot air spray heads 35 extend out of the upper surface of the heat auxiliary assembly shell 31 from the inner cavity of the limiting groove 32, the hot air spray heads 35 are electrically connected with the control terminal 7, the hot air spray heads 35 can be connected with an external air pump, the hot air spray heads 35 can be controlled by the control terminal 7, and air flow in the external air pump is heated by the heating module in the hot air spray heads 35 to form hot air to be sprayed out; the internal gear ring 36 is rotatably connected to the inner side of the annular seat 33 through a bearing; the number of the driven gear rods 37 is several, the several driven gear rods 37 are connected to the top end of the inner wall of the heat auxiliary assembly shell 31 at intervals along the circumferential direction through pin shafts in a rotating mode, the bottom ends of the outer walls of the several driven gear rods 37 are meshed with the inner side of the inner gear ring 36, the top ends of the outer walls of the several driven gear rods 37 are respectively meshed with the several racks 34, the racks 34 move inside and outside under the action of the rotating force of the driven gear rods 37, and the driven gear rods 37 can rotate under the action of the rotating force of the inner gear ring 36; a rotating disk 38 is provided at the bottom end of the ring gear 36; the annular limiting groove 39 is formed in the bottom end of the rotating disc 38, and the gear 316 can move circumferentially along the inner cavity of the annular limiting groove 39 to limit the gear 316; the semi-annular rack 310 is arranged on the lower surface of the rotating disc 38 and is positioned on the inner side of the annular limiting groove 39; the chassis 311 is mounted to the right of the interior cavity of the thermal assist assembly housing 31; one end of the universal coupling 312 is rotatably connected to the top end of the bottom frame 311 through a pin shaft, and the universal coupling 312 can keep the transmission function of the limiting sliding block 315 after moving; the first motor 313 is arranged at the bottom end of the bottom frame 311, the output end of the first motor 313 is fixedly connected with the axis of the universal coupling 312, the first motor 313 is electrically connected with the control terminal 7, the first motor 313 can be controlled by the control terminal 7, and the first motor 313 can drive one end of the universal coupling 312 to rotate; the rail bracket 314 is arranged in the inner cavity of the heat auxiliary assembly shell 31 along the left-right direction and is positioned above the bottom bracket 311; the limiting slide block 315 is inserted in the outer wall of the guide rail frame 314, the axis of the other side of the universal joint 312 is rotatably connected with the bottom end of the limiting slide block 315 through a bearing, the top end of the axis of the limiting slide block 315 extends out of the upper surface of the limiting slide block 315 and is inserted in the inner cavity of the annular limiting groove 39, and the limiting slide block 315 can move left and right on the outer wall of the guide rail frame 314; the gear 316 is in key connection with a top end bearing of the limiting sliding block 315 and is meshed with the outer side of the semi-annular rack 310, the gear 316 moves along the outer circumferential direction of the semi-annular rack 310 under the action of self rotating force, the gear 316 moves on the inner side of the semi-annular rack 310 and simultaneously drives the semi-annular rack 310 to drive the rotating disc 38 to rotate, and when the gear 316 moves to the outer side of the semi-annular rack 310, the semi-annular rack 310 drives the rotating disc 38 to intermittently rotate clockwise or anticlockwise under the action of the rotating force of the gear 316.
Further, as shown in fig. 5, the stretching and clamping unit 4 preferably includes: a stretching clamping unit shell 41, a rotary table 42 with a pin, a bevel gear set 43, a second motor 44, a slot seat 45, an inserted link 46, a connecting seat 47, a mounting seat 48, a rotary seat 49, an auxiliary fixing unit 5, a connecting rod 410 and a sliding groove 411; the stretching clamping unit housing 41 is installed inside the moving end of the biaxial moving module 26; the pin rotating disc 42 is rotatably connected to the top end of the inner cavity of the stretching and clamping unit shell 41 through a pin shaft, and the bottom end of the pin rotating disc 42 is provided with a fixed pin which can rotate in the pin rotating disc 42 and reciprocate in the inner cavity of the sliding groove 411; one end of the bevel gear set 43 is connected with the outside of the axle center of the turntable 42 with the pin, and the bevel gear set 43 adopts two ninety-degree meshed bevel gears for transmission; the second motor 44 is arranged in the inner cavity of the stretching and clamping unit shell 41, the second motor 44 is electrically connected with the control terminal 7, the second motor 44 can be controlled by the control terminal 7, and one end of the bevel gear set 43 can be driven by the second motor 44 to rotate; the slot seat 45 is arranged at the bottom end of the inner cavity of the stretching and clamping unit shell 41; the inserted link 46 is inserted in the inner cavity of the slot seat 45, and the inserted link 46 can move inside and outside the inner cavity of the slot seat 45; the connecting seat 47 is in interference fit with the outer side and the inner side of the inserted rod 46; the number of the mounting seats 48 is two, and the two mounting seats 48 are respectively arranged on the upper side and the lower side of the inner end of the outer wall of the stretching and clamping unit shell 41; the number of the rotating seats 49 is two, the two rotating seats 49 are respectively rotatably connected to the inner sides of the upper and lower mounting seats 48 through pin shafts, two ends of the connecting seat 47 are respectively rotatably connected to the inner sides of the two rotating seats 49 through pin shafts, and the rotating seat 49 can rotate inwards or outwards at the middle point of the rotating connection position of the pin shafts of the mounting seats 48; the number of the auxiliary fixing units 5 is two, and the two auxiliary fixing units 5 are respectively arranged at the inner ends of the upper rotating seat 49 and the lower rotating seat 49; one end of the connecting rod 410 is rotatably connected to the outer end of the inserting rod 46 through a pin shaft; the chute 411 is arranged at the top end of the connecting rod 410, and the turntable 42 with the pin is inserted into the inner cavity of the chute 411.
Further, as shown in fig. 6, the auxiliary fixing unit 5 preferably includes: an auxiliary fixing unit shell 51, a slot 52, a micro motor 53, a rotating seat 54, a pressing block 55 and a sliding groove seat 56; an auxiliary fixing unit housing 51 is provided at an inner end of the rotary base 49 in the front-rear direction; the number of the slots 52 is several, and the several slots 52 are respectively arranged at the inner side of the inner cavity of the auxiliary fixing unit shell 51 from the front to the back clearance; the number of the micro motors 53 is several, the micro motors 53 are respectively arranged in the inner cavity of the auxiliary fixing unit shell 51 and positioned at the outer sides of the slots 52, the micro motors 53 are electrically connected with the control terminal 7, the micro motors 53 can be controlled by the control terminal 7, and the micro motors 53 drive the rotating seats 54 at corresponding positions to synchronously rotate; the number of the rotating seats 54 is several, and the several rotating seats 54 are connected with the output ends of the several micro motors 53 through screws; the number of the pressing blocks 55 is several, the pressing blocks 55 are respectively inserted into the inner cavities of the slots 52, and the pressing blocks 55 can move inside and outside the inner cavities of the slots 52; the number of the sliding groove seats 56 is several, the sliding groove seats 56 are respectively arranged at the outer ends of the pressing blocks 55, and the inner sides of the sliding groove seats 56 are sleeved with the rotating seat 54.
The working principle for bidirectional asynchronous stretching is as follows:
the working personnel sequentially pass through the longitudinal stretcher 8, the transverse stretching mechanism 2 and the winder 9 in advance, and control terminal 7 starts the longitudinal stretcher 8, the second motor 44, the micro motor 53 and the biaxial movement module 26, after the longitudinal stretcher 8 longitudinally stretches the elastic film, the elastic film passes through the inner sides of the left and right groups of stretching and clamping units 4 under the limiting action of the limiting press roller 22, the second motor 44 drives the conical gear set 43 to rotate and drives the pin turntable 42 to circumferentially rotate under the transmission of the conical gear set 43, so that the pin turntable 42 reciprocates in the inner cavity of the chute 411 and drives the connecting rod 410 to drive the inserting rod 46 to move under the matching of the chute 411, and the inserting rod 46 reciprocates inside and outside under the limiting action of the slot seat 45, the inserting rod 46 is prompted to drive the rotary seat 49 to rotate inwards by taking the pin shaft rotation connection part with the mounting seat 48 as a midpoint under the matching of the connecting seat 47, so that the upper rotary seat 49 and the lower rotary seat 49 drive the auxiliary fixing unit 5 at the corresponding position to rotate inwards and clamp and fix the upper surface and the lower surface of the elastic film, a plurality of micro motors 53 in the upper auxiliary fixing unit 5 and the lower auxiliary fixing unit 5 drive the rotary seat 54 at the corresponding position to rotate synchronously, and the rotary seat 54 rotates in the inner cavity of the sliding groove seat 56, so that the rotary seat 54 extends inwards from the inner cavity of the slot 52 under the matching dynamic pressure of the sliding groove seat 56 to clamp the elastic film at a fixed point, so that the stable clamping is kept in the subsequent stretching process, and the biaxial movement module 26 drives the stretching clamping unit 4 to move horizontally to stretch the elastic film transversely under the matching of the stretching clamping unit 4;
in the process of transversely stretching the elastic film, a worker controls the control terminal 7 to start the lifting module 23, the first motor 313, the hot air spray nozzle 35, the tensioning and conveying module 27 and the winding machine 9, the lifting module 23 drives the heat auxiliary component 3 to rise to a specified height position, the first motor 313 drives the universal coupling 312 to rotate, the driving gear 316 rotates under the transmission of the universal coupling 312, so that the gear 316 moves along the outer circumferential direction of the semi-annular rack 310 under the action of self rotating force, the gear 316 moves on the inner side of the semi-annular rack 310 and drives the semi-annular rack 310 to drive the rotating disc 38 to rotate under the limiting action of the annular limiting groove 39 and the limiting slider 315, when the gear 316 moves to the outer side of the semi-annular rack 310, the semi-annular rack 310 drives the rotating disc 38 to rotate in an intermittent clockwise or counterclockwise direction under the rotating force of the gear 316, the rotating disc 38 drives the inner gear ring 36 to rotate in an intermittent clockwise or counterclockwise direction, the driven gear rod 37 is meshed with the rack 34 and the rack 36 respectively, the driven gear rod 37 is meshed with the rack 34 and the driven gear rod 37, the elastic rod 37 heats the elastic spray nozzle 34 and heats the elastic film to be heated and conveyed to the film in a small transverse stretching range, and the elastic film is prevented from being heated and conveyed by the hot air spray nozzle 35, and heated and conveyed to the elastic film after the elastic film is heated and conveyed to be heated and conveyed to the elastic film;
therefore, the preparation method of the lithium ion battery diaphragm can realize bidirectional asynchronous stretching, and the elastic film can be heated in an auxiliary manner in the stretching process, so that the stretched elastic film is slightly heated and cured, the overlarge elastic shrinkage amplitude is avoided, and the stretching effect is reduced.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The preparation method of the lithium ion battery diaphragm is characterized by comprising a base film and a modified layer, wherein the base film comprises a dispersing agent, a glue layer main body material, a thickening agent, a binder, a lithiation material and a solvent, the modified layer is attached to one side or two sides of the base film, and the modified layer comprises: alumina powder and poly-lithium 4-styrene;
the method comprises the following specific steps:
the method comprises the following steps: preparing a base film raw material, mixing the base film raw material according to a formula, and conveying the mixture to an extrusion system;
step two: casting, namely, melting and plasticizing the pre-mixed raw materials in an extrusion system, and then extruding a melt from a die head, wherein the melt forms a base film with a specific crystalline structure after casting;
step three: heat treatment, the base film is subjected to heat treatment to obtain a hard elastic film;
step four: preparing a modified layer coating, and putting raw materials of the modified layer coating into a reactor according to a formula, wherein the volume ratio of the raw materials is 5:95 of water and N-dimethylacetamide mixed solvent, and dispersing to prepare coating slurry;
step five: coating the two sides of the base film with the coating slurry, standing for 10 minutes in an indoor drying environment after coating to naturally evaporate the solvent, changing the external environment, and drying for 24 hours in a vacuum environment at 70-90 ℃ to obtain a film;
step six: performing bidirectional asynchronous stretching, namely performing cold stretching and hot stretching on the elastic film by using the bidirectional asynchronous stretching respectively to form a nano microporous film;
step seven: and cutting the nano microporous membrane into a finished membrane according to the specification requirements of customers.
2. The preparation method of the lithium ion battery separator according to claim 1, characterized in that: the dispersing agent comprises any one or the combination of at least two of polymers, fatty alcohols, polyethylene glycol alkyl aryl ether sodium sulfonate, alkylphenol polyethenoxy ether, polyoxyethylene alkyl phenol ether or sodium polyacrylate, and the main material of the glue layer is a polar substance;
the glue layer main body material comprises polyvinylidene fluoride;
the thickening agent comprises any one or the combination of at least two of polyvinyl alcohol, polyethylene glycol, polyvinylpyrrolidone or sodium carboxymethyl cellulose;
the binder comprises any one or the combination of at least two of polyacrylonitrile, epoxy resin, polymethyl acrylate, styrene butadiene rubber or xanthan gum;
the lithiation material comprises 9-69 parts of pre-lithiation active material, 3-9 parts of solvent, 0.5-1.5 parts of binder and 0.5-1.5 parts of conductive agent,
the pre-lithiation active material is one or more of lithium dioxide, lithium monoxide, lithium sulfide, lithium nitride and lithium manganate, the solvent is ethyl acetate, dimethyl carbonate and diethyl carbonate, the binder is acrylate and sodium carboxymethyl cellulose, and the conductive agent is graphene;
the solvent comprises any one of N-methyl pyrrolidone, dimethylacetamide, dimethylformamide, triethyl phosphate or dimethyl sulfoxide or a combination of at least two of the N-methyl pyrrolidone, the dimethylacetamide, the dimethylformamide and the triethyl phosphate;
the weight portions of the dispersing agent, the glue line main body material, the thickening agent, the binder, the lithiation material and the solvent in the base film are 0.5 portion, 1-4 portions, 3 portions, 1.5 portions and 2.5-90 portions.
3. The device for preparing the lithium ion battery separator is applied to the method for preparing the lithium ion battery separator as claimed in claim 2, and is characterized in that: the method applied to the sixth step comprises the following steps:
a base (1);
the transverse stretching mechanism (2) is arranged on the front side of the base (1);
the protective cover (6) is arranged on the top of the transverse stretching mechanism (2);
the control terminal (7) is embedded in the outer wall of the protective cover (6);
the longitudinal stretcher (8) is arranged on the rear side of the top end of the base (1), and the longitudinal stretcher (8) is electrically connected with the control terminal (7);
the winding machine (9) is arranged on the front side of the transverse stretching mechanism (2), and the winding machine (9) is electrically connected with the control terminal (7).
4. The apparatus for preparing a lithium ion battery separator according to claim 3, wherein: the transverse stretching mechanism (2) comprises:
the transverse stretching mechanism shell (21) is arranged in front of the base (1) along the front-back direction, and the protective cover (6) is arranged at the top of the transverse stretching mechanism shell (21);
the limiting compression roller (22) is arranged in the middle of the rear side of the top end of the transverse stretching mechanism shell (21);
the number of the lifting modules (23) is two, the two lifting modules (23) are respectively arranged on the front side and the rear side of an opening at the top end of the transverse stretching mechanism shell (21), and the lifting modules (23) are electrically connected with the control terminal (7);
the number of the heat auxiliary assemblies (3) is two, and the two heat auxiliary assemblies (3) are respectively arranged at the top ends of the front lifting module and the rear lifting module (23);
the adjustable mounting rack (24) is arranged at the top end of the inner cavity of the protective cover (6) along the front-back direction;
the number of the annular conveying modules (25) is two, the two annular conveying modules (25) are respectively arranged on the left side and the right side of the adjustable mounting frame (24) along the front-back direction, and the annular conveying modules (25) are electrically connected with the control terminal (7);
the number of the double-shaft moving modules (26) is two, the number of the double-shaft moving modules (26) in each group is three, the two groups of double-shaft moving modules (26) are respectively arranged on the outer sides of the left annular conveying module and the right annular conveying module (25) in a clearance mode, and the double-shaft moving modules (26) are electrically connected with the control terminal (7);
the device comprises two groups of stretching clamping units (4), wherein the number of the stretching clamping units (4) is two, the number of the stretching clamping units (4) in each group is three, and the two groups of stretching clamping units (4) are respectively arranged at the moving ends of two groups of biaxial moving modules (26);
the tensioning and conveying module (27) is arranged on the front side of the top end of the transverse stretching mechanism shell (21), and the tensioning and conveying module (27) is electrically connected with the control terminal (7).
5. The device for preparing the lithium ion battery separator according to claim 4, wherein: the heat assist assembly (3) comprises:
a heat assist assembly housing (31) mounted at a lifting end of the lifting module (23);
the number of the limiting grooves (32) is a plurality, and the limiting grooves (32) are arranged at the top end of the inner cavity of the heat auxiliary component shell (31) at intervals along the circumferential direction;
an annular seat (33) arranged by means of a bracket in the inner cavity of the heat-assist assembly housing (31);
the number of the racks (34) is a plurality, and the racks (34) are inserted into the top of the annular seat (33) at intervals along the circumferential direction;
the number of the hot air spray heads (35) is a plurality, the hot air spray heads (35) are circumferentially arranged on the inner sides of the top ends of the racks (34) at intervals, the top ends of the hot air spray heads (35) extend out of the upper surface of the heat auxiliary assembly shell (31) from the inner cavity of the limiting groove (32), and the hot air spray heads (35) are electrically connected with the control terminal (7);
an inner gear ring (36) rotatably connected to the inside of the annular seat (33) by a bearing;
driven gear pole (37), the quantity of driven gear pole (37) is a plurality of, a plurality of driven gear pole (37) are followed circumference interval and are passed through the round pin hub rotation and connect the inner wall top at heat-assisted subassembly shell (31), a plurality of the outer wall bottom and the inboard meshing of internal gear ring (36) of driven gear pole (37), a plurality of the outer wall top of driven gear pole (37) meshes with a plurality of rack (34) respectively.
6. The device for preparing the lithium ion battery separator according to claim 5, wherein: the heat assist assembly (3) further comprises:
a rotating disk (38) disposed at a bottom end of the inner gear ring (36);
the annular limiting groove (39) is formed in the bottom end of the rotating disc (38);
the semi-annular rack (310) is arranged on the lower surface of the rotating disc (38) and is positioned on the inner side of the annular limiting groove (39);
a chassis (311) mounted to the right of the interior cavity of the heat assist assembly housing (31);
one end of the universal coupling (312) is rotatably connected to the top end of the bottom frame (311) through a pin shaft;
the first motor (313) is arranged at the bottom end of the bottom frame (311), the output end of the first motor (313) is fixedly connected with the axis of the universal coupling (312), and the first motor (313) is electrically connected with the control terminal (7);
the guide rail bracket (314) is arranged in the inner cavity of the heat auxiliary assembly shell (31) along the left-right direction and is positioned above the bottom frame (311);
the limiting sliding block (315) is inserted into the outer wall of the guide rail frame (314), the axis of the other side of the universal coupling (312) is rotatably connected with the bottom end of the limiting sliding block (315) through a bearing, and the top end of the axis of the limiting sliding block (315) extends out of the upper surface of the limiting sliding block (315) and is inserted into the inner cavity of the annular limiting groove (39);
and the gear (316) is in key connection with a top end bearing of the limiting sliding block (315) and is meshed with the outer side of the semi-annular rack (310).
7. The apparatus for preparing a lithium ion battery separator according to claim 6, wherein: the stretch clamping unit (4) comprises:
a stretching clamping unit housing (41) installed inside the moving end of the biaxial moving module (26);
the rotating disc (42) with the pin is rotatably connected to the top end of the inner cavity of the stretching and clamping unit shell (41) through a pin shaft;
a bevel gear set (43) with one end connected to the outside of the axis of the pin turntable (42);
the second motor (44) is arranged in an inner cavity of the stretching clamping unit shell (41), and the second motor (44) is electrically connected with the control terminal (7);
the slot seat (45) is arranged at the bottom end of the inner cavity of the stretching and clamping unit shell (41);
the inserting rod (46) is inserted into the inner cavity of the slot seat (45);
the connecting seat (47) is in interference fit with the inner side of the outer side of the inserting rod (46);
the number of the mounting seats (48) is two, and the two mounting seats (48) are respectively arranged on the upper side and the lower side of the inner end of the outer wall of the stretching and clamping unit shell (41);
the number of the rotating seats (49) is two, the two rotating seats (49) are respectively and rotatably connected to the inner sides of the upper mounting seat and the lower mounting seat (48) through pin shafts, and two ends of the connecting seat (47) are respectively and rotatably connected with the inner sides of the two rotating seats (49) through pin shafts;
the number of the auxiliary fixing units (5) is two, and the two auxiliary fixing units (5) are respectively arranged at the inner ends of the upper rotating seat (49) and the lower rotating seat (49);
one end of the connecting rod (410) is rotatably connected to the outer end of the inserted rod (46) through a pin shaft;
the sliding groove (411) is formed in the top end of the connecting rod (410), and the rotating disc (42) with the pin is connected with the inner cavity of the sliding groove (411) in an inserting mode.
8. The device for preparing the lithium ion battery separator according to claim 7, wherein: the auxiliary fixing unit (5) comprises:
an auxiliary fixing unit housing (51) provided at an inner end of the rotary base (49) in the front-rear direction;
the number of the slots (52) is a plurality, and the slots (52) are respectively arranged on the inner side of the inner cavity of the auxiliary fixing unit shell (51) from front to back in a clearance manner;
the number of the micro motors (53) is several, the micro motors (53) are respectively arranged in the inner cavity of the auxiliary fixing unit shell (51) and positioned on the outer sides of the slots (52), and the micro motors (53) are electrically connected with the control terminal (7);
the number of the rotating seats (54) is a plurality, and the rotating seats (54) are connected to the output ends of the micro motors (53) through screws;
the number of the pressing blocks (55) is a plurality, and the pressing blocks (55) are respectively inserted into the inner cavities of the slots (52);
the number of the sliding groove seats (56) is a plurality, the sliding groove seats (56) are respectively arranged at the outer ends of the pressing blocks (55), and the inner sides of the sliding groove seats (56) are sleeved with the rotating seats (54).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN202211518154.0A CN115674740B (en) | 2022-11-30 | Preparation method and preparation device of lithium ion battery diaphragm |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116572446A (en) * | 2023-07-11 | 2023-08-11 | 广东省水利水电科学研究院 | Polytetrafluoroethylene film surface treatment device |
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