CN105436054A - Gumming method for diaphragm of lithium secondary battery - Google Patents
Gumming method for diaphragm of lithium secondary battery Download PDFInfo
- Publication number
- CN105436054A CN105436054A CN201510846145.8A CN201510846145A CN105436054A CN 105436054 A CN105436054 A CN 105436054A CN 201510846145 A CN201510846145 A CN 201510846145A CN 105436054 A CN105436054 A CN 105436054A
- Authority
- CN
- China
- Prior art keywords
- barrier film
- secondary battery
- lithium secondary
- solvent
- glue spreading
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
- B05D1/283—Transferring monomolecular layers or solutions of molecules adapted for forming monomolecular layers from carrying elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2203/00—Other substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2252/00—Sheets
- B05D2252/02—Sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2502/00—Acrylic polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2503/00—Polyurethanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2506/00—Halogenated polymers
- B05D2506/10—Fluorinated polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2506/00—Halogenated polymers
- B05D2506/20—Chlorinated polymers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a gumming method for a diaphragm of a lithium secondary battery. The gumming method comprises the following specific methods that fluid slurry containing an adhesive polymer and a first solvent is prepared; the diaphragm is fully wetted through a second volatile solvent; and the fluid slurry is evenly smeared to at least one face of the diagram through a coating device of a gravure roll with regular patterns, and a binding layer is formed after drying. According to the gumming method, the caking property of the diagram on an electrode is improved, and a surface gum layer is prevented from covering a diagram clearance through the pore-forming function of wetting the diagram firstly; the adhesive is evenly smeared through the coating device of the gravure roll with the regular patterns, the lithium-ion passing ability of the diagram is improved, it is guaranteed that the electrochemical performance of the lithium secondary battery cannot be influenced, and the safety performance of the lithium secondary battery is improved.
Description
Technical field
The present invention relates to electrochmical power source especially field of lithium ion battery, be specifically related to the glue spreading method of lithium secondary battery barrier film.
Background technology
Lithium secondary battery due to its voltage high, life-span is long, specific energy high, since last century end, along with consumption electronic product is as mobile phone, notebook computer, the develop rapidly of digital camera obtains large-scale application, the energy that recent years meaning increases the weight of and environmental problem, makes lithium secondary battery start to be widely used as power resources on automobile, this is also to the higher requirement that lithium secondary battery proposes, especially security.
Current winding type battery causes inevitable deformation because its each position tension force is inconsistent in cyclic process, there is very large potential safety hazard.Laminated type battery can be good at addressing this problem, but the maximum inferior position of laminated type battery is that technique is too complicated.In order to simplify laminated type battery manufacturing process, convoluted laminated batteries arises at the historic moment.
Improving one of method of security is at membrane surface coating porous coating, effectively can prevent the contraction of the barrier film when lithium secondary battery is overheated, reduce both positive and negative polarity and directly contact the possibility causing short circuit.And how in use there is not the emphasis that deformation is also needs concern in battery.
Summary of the invention
The present invention aims to provide a kind of lithium secondary battery barrier film glue spreading method, described method can when not affecting lithium secondary battery electrical property, effective adhesion of electrode diaphragm can be realized, and effectively can improve the heat endurance of barrier film, improve the security of lithium secondary battery.
Barrier film prepared by the present invention can well be applied in convoluted laminated type battery, in this battery production technology, need to carry out adhesive electrodes with stacked and foldable structure, barrier film prepared by the present invention will be conducive to the adhesion of electrode, and not affect the chemical property of lithium secondary battery and improve its security performance.But it should be noted that if adhesive layer thickness is blocked up or binder polymer is excessive, its electrical property can be affected.
For achieving the above object, the invention provides following technical scheme:
A kind of lithium secondary battery barrier film glue spreading method, is characterized in that, comprise the steps:
(1). prepare the fluid slurry comprising binder polymer and the first solvent, the binder polymer that mass fraction is 1-30% is added in the first solvent, uniform stirring, and adjusting viscosity is at 500-2000mPas, wherein the boiling point of the second solvent is not less than the first solvent;
(2). barrier film is infiltrated fully in the second solvent;
(3). use the plater with the gravure roll of regular pattern, by above-mentioned fluid slurry even application at least one side of barrier film, after drying, form tack coat.
Preferably, described barrier film is polyethylene film (PE), or polypropylene screen (PP), or ceramic diaphragm or three layers of composite diaphragm (PP-PE-PP) or other are based on polyolefinic porous substrate.
Preferably, the thickness of described barrier film be 1-50 μm.
Preferably, the first described solvent be any one solvent in acetone, oxolane, carrene, chloroform, METHYLPYRROLIDONE (NMP), cyclohexane or two or more mixtures.
Preferably, described the second solvent be any one or two or more mixtures in acetone, oxolane, carrene, chloroform, cyclohexane.
Preferably, the decorative pattern of the gravure roller surface of described plater is the one in rhombus, circle, parallel bar shaped line, and in wherein parallel bar shaped line, every millimeter of bar shaped line number is 5-50 bar.
Preferably, described binder polymer be polyvinylidene fluoride-altogether-hexafluoropropene, polyvinylidene fluoride-altogether-trifluoro-ethylene, polymethyl methacrylate, butyl polyacrylate, polyacrylonitrile, cellulose acetate-butyrate, polyvinylpyrrolidone, PEO, cyanoethyl pullulan, cyanoethyl polyvinylalcohol, cyanethyl cellulose, cyanoethyl sucrose, any one or two or more mixture of carboxymethyl cellulose.
Preferably, the described fluid slurry viscosity comprising binder polymer and the second solvent be 500-2000mPas.
Preferably, described adhesive layer thickness at 0.1-15 μm.
Compared with prior art, the invention has the beneficial effects as follows:
Lithium secondary battery barrier film glue spreading method of the present invention, finally at least one side of barrier film, define tack coat, improve the caking property of barrier film for electrode, and by infiltrating the pore-creating effect of barrier film in advance, the covering to barrier film space of the surface size prevented, makes adhesive evenly apply by the gravure roll of regular pattern, improves the lithium ion property passed through of barrier film, ensure that the chemical property of lithium secondary battery is unaffected, and improve the security performance of lithium secondary battery.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of barrier film glue spreading method of the present invention;
Fig. 2 is a kind of schematic cross-section of the embodiment of the present invention 1 gravure roll;
Fig. 3 is a kind of schematic cross-section of the embodiment of the present invention 1 gravure roll;
Fig. 4 is a kind of schematic cross-section of the embodiment of the present invention 1 gravure roll;
In Fig. 1,1, coatings tank; 2, scraper; 3, gravure roll; 4, deflector roll; 5, barrier film.
Detailed description of the invention
Below in conjunction with accompanying drawing and example, the present invention is described in further detail, is intended to be convenient to the understanding of the present invention, but the present invention is not limited to listed embodiment.
In addition, the embodiment proposed in this description and accompanying drawing are only the preferred embodiment for example illustration purpose, be not intended to limit scope of invention, therefore understand and can make other equivalents and modification when not deviating from the spirit and scope of the present invention.
A kind of lithium secondary battery barrier film glue spreading method, comprises the following steps:
(1) fluid slurry comprising binder polymer and the first solvent is prepared.In the first solvent, add the binder polymer that mass fraction is 1-30%, uniform stirring, and adjusting viscosity is at 500-2000mPas.The boiling point of the second solvent is not less than the first solvent.
(2) infiltrate in the second solvent described barrier film, described barrier film is entered the immersion slot that the second solvent is housed by guide roller.The thickness of this barrier film is at 1-50 μm, and aperture is 0.001-50 μm, and porosity is 10%-60%.
(3) subsequently in the plater of the gravure roll of regular decorative pattern, with reference to Fig. 1, gravure roll is immersed in and comprises binder polymer, in the coatings tank 1 of the fluid slurry of the first solvent, regulates scraper 2, gravure roll is made evenly to adhere to slurry, barrier film 5 is contacted with gravure roll in the direction of arrows by deflector roll 4, makes to comprise binder polymer, and the fluid slurry of the first solvent is coated at least one side of barrier film, dry at 60-100 DEG C, the final adhesive layer thickness formed is at 0.1-15 μm.
Embodiment 1
(1) polyvinylidene fluoride-altogether-trifluoro-ethylene is chosen and cyanoethyl pullulan is binder polymer, add in acetone with the ratio of mass ratio 7:3, stir 8h with the rotating speed of 1200rpm/min, adjusting viscosity is 1500mPas, is transferred to coatings tank 1 to be coated.
(2) PP barrier film 5 thick for 20um is entered by deflector roll 4 immersion slot that acetone is housed to infiltrate.
(3) with reference to Fig. 1, gravure roll 3 with Fig. 2 decorative pattern is immersed in coatings tank 1, regulate scraper 2, make gravure roll evenly adhere to slurry, barrier film 5 is contacted with gravure roll 3 in the direction of arrows by deflector roll 4, make to comprise binder polymer, the fluid slurry of acetone is coated in the one side of step 2 barrier film, dries, complete gluing at 60 DEG C, the adhesive layer thickness of final formation is at 0.1-15 μm, and wherein Fig. 2 decorative pattern is the rhombus of arrayed.
Embodiment 2
(1) polyvinylidene fluoride-altogether-hexafluoropropene is chosen and cyanethyl cellulose is binder polymer, add in acetone with the ratio of mass ratio 8:2, stir 8h, adjusting viscosity 1500mPas with the rotating speed of 1500rpm/min, be transferred to coatings tank 1 to be coated;
(2) the one side PE barrier film 5 that is coated with pottery is entered by deflector roll 4 that acetone and chloroform volume ratio are housed is that the immersion slot of 7:3 infiltrates, and the thickness of its septation 5 is 12um, and ceramic thickness is 4um;
(3) with reference to Fig. 1, gravure roll 3 with Fig. 3 decorative pattern is immersed in coatings tank 1, regulate scraper 2, make gravure roll 3 evenly adhere to slurry, barrier film 5 is contacted with gravure roll 3 in the direction of arrows by deflector roll 4, makes the fluid slurry comprising binder polymer and acetone be coated in the ceramic plane of step 2 barrier film, dry at 60 DEG C, complete gluing, the final adhesive layer thickness formed is at 0.1-15 μm, and wherein Fig. 3 decorative pattern is the circle of arrayed.
Embodiment 3
(1) polyvinylidene fluoride-altogether-trifluoro-ethylene is chosen and cyanoethyl pullulan is described binder polymer, add in acetone with the ratio of mass ratio 7:3, stir 8h, adjusting viscosity 1500mPas with the rotating speed of 1500rpm/min, be transferred to coatings tank 1 to be coated.
(2) the PE barrier film 5 one side being coated with pottery is entered by deflector roll 4 that acetone and cyclohexane volume ratio are housed is that the immersion slot of 7:3 infiltrates, and the thickness of its septation 5 is 12um, and ceramic thickness is 4um.
(3) with reference to Fig. 1, gravure roll 3 with Fig. 4 decorative pattern is immersed in coatings tank 1, regulate scraper 2, make gravure roll 3 evenly adhere to slurry, barrier film 5 is contacted with gravure roll 3 in the direction of arrows by deflector roll 4, the fluid slurry comprising binder polymer and acetone is made to be coated in the non-ceramic face of step 2 barrier film, dry at 60 DEG C, complete gluing, the final adhesive layer thickness formed is at 0.1-15 μm, wherein Fig. 4 decorative pattern is parallel bar shaped line, and every millimeter of gap fringe number is 5-50 bar.
In sum, according to barrier film glue spreading method of the present invention, finally at least one side of barrier film 5, define tack coat, improve the caking property of barrier film 5 for electrode, and by infiltrating the pore-creating effect of barrier film 5 in advance, the covering to barrier film 5 space of the surface size prevented, by the gravure roll 3 of regular pattern, adhesive is evenly applied, the lithium ion that improve barrier film 5, by property, ensure that the chemical property of lithium secondary battery is unaffected, and improves the security performance of lithium secondary battery.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the embodiment of the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, in the scope of, accompanying drawing open in the application and claim, multiple modification and improvement can be carried out to the building block of subject combination layout and/or layout.Except the modification of carrying out building block and/or layout is with except improvement, to those skilled in the art, other purposes also will be obvious.Therefore, the embodiment of the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with design feature disclosed herein.
Claims (9)
1. a lithium secondary battery barrier film glue spreading method, is characterized in that, comprises the steps:
(1). prepare the fluid slurry comprising binder polymer and the first solvent, the binder polymer that mass fraction is 1-30% is added in the first solvent, uniform stirring, and adjusting viscosity is at 500-2000mPas, wherein the boiling point of the second solvent is not less than the first solvent;
(2). barrier film is infiltrated fully in the second solvent;
(3). use the plater with the gravure roll of regular pattern, by above-mentioned fluid slurry even application at least one side of barrier film, after drying, form tack coat.
2. lithium secondary battery barrier film glue spreading method as claimed in claim 1, it is characterized in that, described barrier film is polyethylene film (PE), or polypropylene screen (PP), or ceramic diaphragm, or three layers of composite diaphragm (PP-PE-PP), or other are based on polyolefinic porous substrate.
3. lithium secondary battery barrier film glue spreading method as claimed in claim 1, it is characterized in that, the thickness of described barrier film is 1-50 μm.
4. lithium secondary battery barrier film glue spreading method as claimed in claim 1, it is characterized in that, the first described solvent is any one solvent in acetone, oxolane, carrene, chloroform, METHYLPYRROLIDONE (NMP), cyclohexane or two or more mixtures.
5. lithium secondary battery barrier film glue spreading method as claimed in claim 1, is characterized in that, described the second solvent is any one or two or more mixtures in acetone, oxolane, carrene, chloroform, cyclohexane.
6. lithium secondary battery barrier film glue spreading method as claimed in claim 1, it is characterized in that, the decorative pattern of the gravure roller surface of described plater is the one in rhombus, circle, parallel bar shaped line, and in wherein parallel bar shaped line, every millimeter of bar shaped line number is 5-50 bar.
7. lithium secondary battery barrier film glue spreading method as claimed in claim 1, it is characterized in that, described binder polymer is polyvinylidene fluoride-altogether-hexafluoropropene, polyvinylidene fluoride-altogether-trifluoro-ethylene, polymethyl methacrylate, butyl polyacrylate, polyacrylonitrile, cellulose acetate-butyrate, polyvinylpyrrolidone, PEO, cyanoethyl pullulan, cyanoethyl polyvinylalcohol, cyanethyl cellulose, cyanoethyl sucrose, any one or two or more mixture of carboxymethyl cellulose.
8. lithium secondary battery barrier film glue spreading method as claimed in claim 1, it is characterized in that, the described fluid slurry viscosity comprising binder polymer and the second solvent is 500-2000mPas.
9. lithium secondary battery barrier film glue spreading method as claimed in claim 1, it is characterized in that, described adhesive layer thickness is at 0.1-15 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510846145.8A CN105436054A (en) | 2015-11-25 | 2015-11-25 | Gumming method for diaphragm of lithium secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510846145.8A CN105436054A (en) | 2015-11-25 | 2015-11-25 | Gumming method for diaphragm of lithium secondary battery |
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| Publication Number | Publication Date |
|---|---|
| CN105436054A true CN105436054A (en) | 2016-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510846145.8A Pending CN105436054A (en) | 2015-11-25 | 2015-11-25 | Gumming method for diaphragm of lithium secondary battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111370622A (en) * | 2020-03-18 | 2020-07-03 | 江苏厚生新能源科技有限公司 | Coating area-controllable gluing diaphragm and preparation method thereof, gluing layer and lithium battery |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101345295A (en) * | 2008-03-07 | 2009-01-14 | 惠州亿纬锂能股份有限公司 | Production method of septum for lithium ion battery |
| CN103028535A (en) * | 2012-12-11 | 2013-04-10 | 天津力神电池股份有限公司 | Membrane gluing method |
| US20130101885A1 (en) * | 2011-10-20 | 2013-04-25 | Joo Sung Lee | Method for manufacturing separator, separator manufactured by the method and method for manufacturing electrochemical device including the separator |
| CN104275268A (en) * | 2013-07-02 | 2015-01-14 | 浙江万向亿能动力电池有限公司 | Surface coating device and method for lithium battery pole piece or diaphragm |
-
2015
- 2015-11-25 CN CN201510846145.8A patent/CN105436054A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101345295A (en) * | 2008-03-07 | 2009-01-14 | 惠州亿纬锂能股份有限公司 | Production method of septum for lithium ion battery |
| US20130101885A1 (en) * | 2011-10-20 | 2013-04-25 | Joo Sung Lee | Method for manufacturing separator, separator manufactured by the method and method for manufacturing electrochemical device including the separator |
| CN103028535A (en) * | 2012-12-11 | 2013-04-10 | 天津力神电池股份有限公司 | Membrane gluing method |
| CN104275268A (en) * | 2013-07-02 | 2015-01-14 | 浙江万向亿能动力电池有限公司 | Surface coating device and method for lithium battery pole piece or diaphragm |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111370622A (en) * | 2020-03-18 | 2020-07-03 | 江苏厚生新能源科技有限公司 | Coating area-controllable gluing diaphragm and preparation method thereof, gluing layer and lithium battery |
| CN111370622B (en) * | 2020-03-18 | 2022-01-28 | 江苏厚生新能源科技有限公司 | Coating area-controllable gluing diaphragm and preparation method thereof, gluing layer and lithium battery |
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Application publication date: 20160330 |
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