CN105244455A - Anti-corrosion protective film for soft package lithium battery and preparation method and application thereof - Google Patents
Anti-corrosion protective film for soft package lithium battery and preparation method and application thereof Download PDFInfo
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- CN105244455A CN105244455A CN201510566133.XA CN201510566133A CN105244455A CN 105244455 A CN105244455 A CN 105244455A CN 201510566133 A CN201510566133 A CN 201510566133A CN 105244455 A CN105244455 A CN 105244455A
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- lithium battery
- package lithium
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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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
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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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
- H01M50/1245—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure characterised by the external coating on the casing
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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 belongs to the technical field of batteries, and particularly discloses an anti-corrosion protective film for a soft package lithium battery and a preparation method and an application thereof. The anti-corrosion protective film for the soft package lithium battery comprises epoxy resin, phenolic resin, polyvinyl butyral resin and a solvent, wherein the solvent is at least one of isopropyl alcohol, acetone and n-butyl acetate. The preparation method comprises the following steps: (1) preparation of a protective film liquid, namely adding the epoxy resin, the phenolic resin and the polyvinyl butyral resin to the solvent, adjusting the pH, heating and stirring the solvent, stopping heating the solvent, further adding the solvent to adjust system viscosity, and stirring the solvent to obtain the protective film liquid; and (2) preparation of the protective film, namely evenly spraying a film coating liquid prepared in the step (1) on a core surface of the soft package lithium battery by a spray gun, and drying the film coating liquid to form the protective film on the core surface of the soft package lithium battery. The preparation method is simple; and the prepared protective film has excellent corrosion resistance, also has excellent abrasive resistance and weather fastness, and is not easy to fall off, but easy to peel off, and free of a residue.
Description
Technical field
The invention belongs to cell art, be specifically related to a kind of soft package lithium battery anti-corrosion protective film and its preparation method and application.
Background technology
Soft package lithium battery feature is the basic chemical property of integrated liquid lithium battery and the upper unique advantage of profile packaging of poly-lithium battery, and adopts the medium that the liquid electrolyte similar to liquid lithium battery is transmitted between both positive and negative polarity as lithium ion.Soft package lithium battery is compared with metal-back or electric battery with plastic case, and soft package lithium battery security performance is good, thickness is thin, flexible design, cost are lower, and thus it is subject to the favor of users at home and abroad.But when production and processing soft package lithium battery, its surface easily suffers the corrosion such as electrolyte, also easily damage is scraped, affect product quality, some producer, in order to prevent battery to be corroded, scrape damage, at battery surface parcel plastic film, but uses plastic film to there are more quality problems, as solid in being pasted not strongly between plastic film and battery surface, in transport and use procedure, there is the phenomenon come off; Plastic film weatherability is poor, and easily occur under high temperature that two ends tilt, anticorrosive property is also poor; Difficulty etc. peeled off by plastic film; And the technique of parcel plastic film is consuming time, too increases production cost.Current technology also discloses multiple composite protection film, and these composite protection films are made up of multilayer material, and its effect is good, but its cost of material is high, and manufacture craft is loaded down with trivial details, is unfavorable for applying.
Chinese patent CN1327540C discloses a kind of preparation method of lithium iron cell protective film, it is by phenolic resins, epoxy resin, polyvinyl acetate, polyurethane, polytetrafluoroethylene, neoprene, phenolic aldehyde-neoprene, epoxy-polyester amine, at least one in phenolic aldehyde-Pioloform, polyvinyl acetal etc. joins deionized water, methyl alcohol, benzene, toluene, acetone, ethyl acetate, in at least one in normal hexane etc., spraying forms protecting film again, this protecting film is smeared easy, and available deionized water, ethanol, the cleanings such as acetone, but the decay resistance of this protecting film, resistance to wear and weatherability need to improve.
Therefore; for the deficiencies in the prior art, be necessary to research and develop a kind of soft package lithium battery anti-corrosion protective film and preparation method thereof, the diaphragm that its method obtains both had possessed excellent corrosion resistance; also possess good resistance to wear and weatherability, and difficult drop-off but easily peel off.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of soft package lithium battery anti-corrosion protective film and preparation method thereof, this soft package lithium battery anti-corrosion protective film possesses excellent corrosion resistance, also possesses good resistance to wear and weatherability, and difficult drop-off but easily peel off; And its preparation method is simple, process stabilizing.
To achieve these goals, technical scheme of the present invention is as follows:
A kind of soft package lithium battery anti-corrosion protective film, comprises the raw materials of following weight portion: epoxy resin 8 ~ 12 parts, 5 ~ 8 parts, phenolic resins, polyvinyl butyral resin 6 ~ 10 parts and solvent 70 ~ 80 parts; Described solvent is at least one in isopropyl alcohol, acetone and butyl acetate.
Preferably, be made up of the raw materials of following weight portion: epoxy resin 10 parts, 7 parts, phenolic resins, polyvinyl butyral resin 8 parts and solvent 75 parts.
Preferred further, described epoxy resin is bisphenol A type epoxy resin or bisphenol-s epoxy resin.
Preferred further, described phenolic resins is rosin modified phenolic resin or dimethylbenzene phenol-formaldehyde resin modified.
Preferred further, described solvent is the composition of acetone and butyl acetate, and the weight ratio of described acetone and butyl acetate is (8 ~ 12): 1.
The preparation method of above-mentioned soft package lithium battery anti-corrosion protective film specifically comprises the following steps:
(1) preparation of diaphragm liquid: add epoxy resin, phenolic resins and polyvinyl butyral resin in solvent, uses vinegar acid for adjusting pH to be 5 ~ 6, is heated to 55 ~ 65 DEG C, stirs 20 ~ 40min; Stop heating, continue to add solvent to adjust system viscosity for 3000 ~ 10000cps, then stir 10 ~ 20min and obtain diaphragm liquid;
(2) preparation of diaphragm: used by diaphragm liquid obtained in step (1) spray gun even application on soft package lithium battery battery core surface; to leave standstill at normal temperatures or 80 ~ 90 DEG C of bakings leave standstill to diaphragm liquid dry under vacuum conditions, namely form diaphragm on soft package lithium battery battery core surface.
In addition, present invention also offers the application of described soft package lithium battery anti-corrosion protective film in soft package lithium battery is produced, in flexible package lithium cell assembling process, after battery core just seals operation, increase described soft package lithium battery anti-corrosion protective film on battery core surface; Subsequently according to normal running procedures, normal running operation comprise baking after fluid injection, change into, bleed partial volume and integer; Before soft package lithium battery finally detects warehouse-in, use ethanol to be sprayed on described soft package lithium battery anti-corrosion protective film, described soft package lithium battery anti-corrosion protective film can be torn.
Soft package lithium battery anti-corrosion protective film of the present invention is using at least one in isopropyl alcohol, acetone and butyl acetate as solvent; add the composition of epoxy resin, phenolic resins and polyvinyl butyral resin; said composition is in specific solvent; pH value be 5 ~ 6, temperature mixes under being the condition of 55 ~ 65 DEG C, in conjunction with crosslinked, the battery core being then sprayed on soft-package battery forms the diaphragm of one deck Stability Analysis of Structures, excellent performance on the surface.Diaphragm liquid of the present invention both can not react with the electrolyte of inside battery, also can not damage battery core surface, and the diaphragm of formation possesses good chemical stability, and adhesiveness is good, difficult drop-off, namely departs from battery core surface, can peel off in flakes, not remain after spraying ethanol.
In a word, compared with prior art, advantage of the present invention is:
(1) soft package lithium battery anti-corrosion protective film excellent performance of the present invention, its chemical stability is high, corrosion-resistant, can prevent the corrosion such as electrolyte in actual production; Meanwhile, its resistance to wear is good, hardness is high, effectively avoids the scratching to soft package lithium battery battery core in production process; And its thermal endurance, strong adhesion, difficult drop-off, non-foaming under long-time high temperature, do not ftracture, not efflorescence, two ends and surface conjunction closely do not tilt, available protecting battery core in soft package lithium battery production process.In addition namely soft package lithium battery anti-corrosion protective film of the present invention departs from battery core surface after smearing ethanol, can peel off in flakes, not remain.
(2) preparation method's cost of material of soft package lithium battery anti-corrosion protective film of the present invention is low, and method of operation is simple, and process stabilizing, can be applicable.Soft package lithium battery anti-corrosion protective film of the present invention is applied to during soft package lithium battery produces, smear easy, peel off quick, in soft package lithium battery production process, both play the effect of available protecting battery core, substantially increase operating efficiency again, reduce production cost.
Embodiment
Further describe the present invention below by way of embodiment, but the present invention is not limited only to following examples.Within the scope of the invention or not departing from content of the present invention, spirit and scope; soft package lithium battery anti-corrosion protective film of the present invention and preparation method thereof is suitably improved, replaces the identical component of effect; will become apparent to those skilled in the art that they are all deemed to be included within scope of the present invention.
embodiment 1, soft package lithium battery anti-corrosion protective film of the present invention and preparation method thereof
Formula: bisphenol A type epoxy resin 10kg, rosin modified phenolic resin 7kg, polyvinyl butyral resin 8kg and solvent 75kg; Described solvent is the composition of acetone and butyl acetate, and the weight ratio of described acetone and butyl acetate is 10:1.
Preparation method: the preparation of (1) diaphragm liquid: add bisphenol A type epoxy resin, rosin modified phenolic resin and polyvinyl butyral resin in solvent, uses vinegar acid for adjusting pH to be 5.5, is heated to 60 DEG C, stirs 30min; Stop heating, continue to add solvent to adjust system viscosity for 5000cps, then stir 15min and obtain diaphragm liquid;
(2) preparation of diaphragm: used by diaphragm liquid obtained in step (1) spray gun even application on soft package lithium battery battery core surface, leave standstill to diaphragm liquid dry at normal temperatures, namely form diaphragm on soft package lithium battery battery core surface.
embodiment 2, soft package lithium battery anti-corrosion protective film of the present invention and preparation method thereof
Formula: bisphenol-s epoxy resin 8kg, dimethylbenzene phenol-formaldehyde resin modified 8kg, polyvinyl butyral resin 6kg and solvent 78kg; Described solvent is the composition of acetone and butyl acetate, and the weight ratio of described acetone and butyl acetate is 8:1.
Preparation method: the preparation of (1) diaphragm liquid: add bisphenol-s epoxy resin, dimethylbenzene phenol-formaldehyde resin modified and polyvinyl butyral resin in solvent, uses vinegar acid for adjusting pH to be 5, is heated to 65 DEG C, stirs 20min; Stop heating, continue to add solvent to adjust system viscosity for 6000cps, then stir 20min and obtain diaphragm liquid;
(2) preparation of diaphragm: used by diaphragm liquid obtained in step (1) spray gun even application on soft package lithium battery battery core surface, leave standstill to diaphragm liquid dry at normal temperatures, namely form diaphragm on soft package lithium battery battery core surface.
embodiment 3, soft package lithium battery anti-corrosion protective film of the present invention and preparation method thereof
Formula: bisphenol A type epoxy resin 12kg, dimethylbenzene phenol-formaldehyde resin modified 5kg, polyvinyl butyral resin 10kg and solvent 73kg; Described solvent is the composition of acetone and butyl acetate, and the weight ratio of described acetone and butyl acetate is 12:1.
Preparation method: the preparation of (1) diaphragm liquid: add bisphenol A type epoxy resin, dimethylbenzene phenol-formaldehyde resin modified and polyvinyl butyral resin in solvent, uses vinegar acid for adjusting pH to be 6, is heated to 55 DEG C, stirs 40min; Stop heating, continue to add solvent to adjust system viscosity for 8000cps, then stir 10min and obtain diaphragm liquid;
(2) preparation of diaphragm: used by diaphragm liquid obtained in step (1) spray gun even application on soft package lithium battery battery core surface, 80 DEG C of bakings leave standstill to diaphragm liquid dry under vacuum conditions, namely form diaphragm on soft package lithium battery battery core surface.
embodiment 4, soft package lithium battery anti-corrosion protective film of the present invention and preparation method thereof
Formula: bisphenol-s epoxy resin 10kg, rosin modified phenolic resin 6kg, polyvinyl butyral resin 8kg and solvent 73kg; Described solvent is the composition of isopropyl alcohol and butyl acetate, and the weight ratio of described isopropyl alcohol and butyl acetate is 10:1.
Preparation method: the preparation of (1) diaphragm liquid: add bisphenol-s epoxy resin, rosin modified phenolic resin and polyvinyl butyral resin in solvent, uses vinegar acid for adjusting pH to be 6, is heated to 60 DEG C, stirs 30min; Stop heating, continue to add solvent to adjust system viscosity for 6000cps, then stir 20min and obtain diaphragm liquid;
(2) preparation of diaphragm: used by diaphragm liquid obtained in step (1) spray gun even application on soft package lithium battery battery core surface, 90 DEG C of bakings leave standstill to diaphragm liquid dry under vacuum conditions, namely form diaphragm on soft package lithium battery battery core surface.
embodiment 5, soft package lithium battery anti-corrosion protective film of the present invention and preparation method thereof
Formula: bisphenol A type epoxy resin 10kg, rosin modified phenolic resin 7kg, polyvinyl butyral resin 8kg and solvent 75kg; Described solvent is acetone.
Preparation method: the preparation of (1) diaphragm liquid: add bisphenol A type epoxy resin, rosin modified phenolic resin and polyvinyl butyral resin in solvent, uses vinegar acid for adjusting pH to be 5.5, is heated to 60 DEG C, stirs 30min; Stop heating, continue to add solvent to adjust system viscosity for 5000cps, then stir 15min and obtain diaphragm liquid;
(2) preparation of diaphragm: used by diaphragm liquid obtained in step (1) spray gun even application on soft package lithium battery battery core surface, leave standstill to diaphragm liquid dry at normal temperatures, namely form diaphragm on soft package lithium battery battery core surface.
embodiment 6, soft package lithium battery anti-corrosion protective film of the present invention and preparation method thereof
Formula: bisphenol A type epoxy resin 12kg, rosin modified phenolic resin 5kg, polyvinyl butyral resin 10kg and solvent 75kg; Described solvent is the composition of acetone and butyl acetate, and the weight ratio of described acetone and butyl acetate is 10:1.
Preparation method: the preparation of (1) diaphragm liquid: add bisphenol A type epoxy resin, rosin modified phenolic resin and polyvinyl butyral resin in solvent, uses vinegar acid for adjusting pH to be 5.5, is heated to 60 DEG C, stirs 30min; Stop heating, continue to add solvent to adjust system viscosity for 5000cps, then stir 15min and obtain diaphragm liquid;
(2) preparation of diaphragm: used by diaphragm liquid obtained in step (1) spray gun even application on soft package lithium battery battery core surface, leave standstill to diaphragm liquid dry at normal temperatures, namely form diaphragm on soft package lithium battery battery core surface.
the application in soft package lithium battery is produced of embodiment 7, soft package lithium battery anti-corrosion protective film of the present invention
In flexible package lithium cell assembling process, after battery core just seals operation, increase embodiment 1 soft package lithium battery anti-corrosion protective film according to the preparation method of embodiment 1 on battery core surface; Subsequently according to normal running procedures, normal running operation comprise baking after fluid injection, change into, bleed partial volume and integer; Before soft package lithium battery finally detects warehouse-in, use ethanol to be sprayed on soft package lithium battery anti-corrosion protective film, soft package lithium battery anti-corrosion protective film can be torn.
comparative example 1
Formula: bisphenol A type epoxy resin 10kg, rosin modified phenolic resin 7kg and solvent 83kg; Described solvent is the composition of acetone and butyl acetate, and the weight ratio of described acetone and butyl acetate is 10:1.
Preparation method is with embodiment 1.
comparative example 2
Formula: rosin modified phenolic resin 7kg, polyvinyl butyral resin 8kg and solvent 85kg; Described solvent is the composition of acetone and butyl acetate, and the weight ratio of described acetone and butyl acetate is 10:1.
Preparation method is with embodiment 1.
comparative example 3
Formula: bisphenol A type epoxy resin 10kg, rosin modified phenolic resin 7kg, polyvinyl butyral resin 8kg and solvent 75kg; Described solvent is the composition of acetone and ethyl acetate, and the weight ratio of described acetone and ethyl acetate is 10:1.
Preparation method is with embodiment 1.
comparative example 4
Formula is with embodiment 1.
Preparation method: the preparation of (1) diaphragm liquid: add bisphenol A type epoxy resin, rosin modified phenolic resin and polyvinyl butyral resin in solvent, uses vinegar acid for adjusting pH to be 5.5, stirs 30min; Continue to add solvent to adjust system viscosity for 5000cps, then stir 15min and obtain diaphragm liquid;
(2) preparation of diaphragm: used by diaphragm liquid obtained in step (1) spray gun even application on soft package lithium battery battery core surface, leave standstill to diaphragm liquid dry at normal temperatures, namely form diaphragm on soft package lithium battery battery core surface.
comparative example 5
Formula is with embodiment 1.
Preparation method: the preparation of (1) diaphragm liquid: add bisphenol A type epoxy resin, rosin modified phenolic resin and polyvinyl butyral resin in solvent, uses vinegar acid for adjusting pH to be 4, is heated to 60 DEG C, stirs 30min; Stop heating, continue to add solvent to adjust system viscosity for 5000cps, then stir 15min and obtain diaphragm liquid;
(2) preparation of diaphragm: used by diaphragm liquid obtained in step (1) spray gun even application on soft package lithium battery battery core surface, leave standstill to diaphragm liquid dry at normal temperatures, namely form diaphragm on soft package lithium battery battery core surface.
comparative example 6
Formula is with embodiment 1.
Preparation method: the preparation of (1) diaphragm liquid: add bisphenol A type epoxy resin, rosin modified phenolic resin and polyvinyl butyral resin in solvent, stirs 30min; Continue to add solvent to adjust system viscosity for 5000cps, then stir 15min and obtain diaphragm liquid;
(2) preparation of diaphragm: used by diaphragm liquid obtained in step (1) spray gun even application on soft package lithium battery battery core surface, leave standstill to diaphragm liquid dry at normal temperatures, namely form diaphragm on soft package lithium battery battery core surface.
test example one,
Test method:
1, antiacid mist corrosion test: according to GB/T10125-2012 artificial atmosphere corrosion test salt mist test, adopt neutral salt spray test (NSS) test, the test period is 24h, 48h, 72h, 96h, 144h, 168h, 192h, 216h, 240h, 264h, 288h, 312h and 336h.Bubble according to film or the amount of rust staining judge anticorrosion film by corrosion condition, if film 144h starts to occur to bubble or namely rust staining stops test, record 144h is as film salt fog resistance corrosion test result; Do not occur yet bubbling or rust staining if test after 336 hours, then stop test, film salt fog resistance result of the test is designated as 336 hours.
2, abrasion test: according to the mensuration rotation rubber emery wheel method of GB/T1768-2006 paint and varnish resistance to wear, uses 100
#quartz emery wheel measures.
3, pencil hardness test: measure hardness of paint film according to GB/T6739-2006 paint and varnish pencil method, carry out pencil hardness test with the pencil of 4B, 3B, 2B, HB, F, H, 2H, 3H and 4H successively.
4, heat-resistance test: according to the mensuration of GBT1735-2009 paint and varnish thermal endurance, sample is put into convection oven, is heated to 120 DEG C and heated at constant temperature 24h, and heating terminates, and takes out and observe after making sample be cooled to room temperature together with convection oven.
5, adhesion test: according to the cross cut test of GB/T9286-1998 paint and varnish paint film, carries out described test.
Above-mentioned test method is adopted to carry out performance test to the diaphragm that embodiment 1 ~ 6 and comparative example 1 ~ 6 obtain.Wherein test method 1 ~ 4 is according to GB/T9271-2008(paint and varnish standard test plate (panel)) diaphragm that uses aluminium sheet preparation standard test plate (panel) to use the preparation method of embodiment 1 ~ 6 and comparative example 1 ~ 6 to obtain again tests; Test method 5 directly takes preparation has the battery core of the soft package lithium battery of diaphragm to test.Concrete outcome sees the following form 1:
The each diaphragm performance test results of table 1
From upper table 1:
(1) the soft package lithium battery anti-corrosion protective film excellent performance that the embodiment of the present invention 1 ~ 6 is obtained, its chemical stability is high, corrosion-resistant, phenomenons such as can not dissolving in antiacid mist corrosion test, expand, come off, can prevent the corrosion such as electrolyte in actual production; Meanwhile, its resistance to wear is good, hardness is high, effectively avoids the scratching to soft package lithium battery battery core in production process; And its thermal endurance is good, strong adhesion, does not come off under long-time high-temperature baking, non-foaming, do not ftracture, not efflorescence, two ends are combined with intimate surface and do not tilt, available protecting battery in soft package lithium battery production process.In embodiment 1 ~ 6, optimum with each performance index of soft package lithium battery anti-corrosion protective film that embodiment 1 is obtained, so embodiment 1 is most preferred embodiment of the present invention.
(2) comparative example 1 and comparative example 2 are compared with embodiment 1; all lack a certain component in composition described in embodiment 1; its obtained diaphragm performance, all not as embodiment 1, illustrates that bisphenol A type epoxy resin, rosin modified phenolic resin and polyvinyl butyral resin three exist synergy.
(3) comparative example 3 is compared with embodiment 1; change the kind of solvent; butyl acetate is replaced with ethyl acetate; its obtained diaphragm performance is also not as embodiment 1; illustrate that the solvent combination of acetone of the present invention and butyl acetate can promote the combination that mixes of epoxy resin of the present invention, phenolic resins and polyvinyl butyral resin composition well; especially promote the combination that mixes of bisphenol A type epoxy resin, rosin modified phenolic resin and polyvinyl butyral resin composition, thus forming property excellence, the diaphragm that is applicable to soft package lithium battery battery core.
(4) comparative example 4 ~ 6 is compared with embodiment 1; change the operating condition of preparation method; obvious gap is there is in the performance of its obtained diaphragm compared with embodiment 1; illustrate that in preparation method of the present invention, adjust ph and heating steps all contribute to the interaction of soft package lithium battery anti-corrosion protection film formulation of the present invention, thus form the soft package lithium battery anti-corrosion protective film of Stability Analysis of Structures, excellent performance.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (7)
1. a soft package lithium battery anti-corrosion protective film, is characterized in that, comprises the raw materials of following weight portion: epoxy resin 8 ~ 12 parts, 5 ~ 8 parts, phenolic resins, polyvinyl butyral resin 6 ~ 10 parts and solvent 70 ~ 80 parts; Described solvent is at least one in isopropyl alcohol, acetone and butyl acetate.
2. soft package lithium battery anti-corrosion protective film as claimed in claim 1, is characterized in that, be made up of the raw materials of following weight portion: epoxy resin 10 parts, 7 parts, phenolic resins, polyvinyl butyral resin 8 parts and solvent 75 parts.
3. soft package lithium battery anti-corrosion protective film as claimed in claim 1 or 2, it is characterized in that, described epoxy resin is bisphenol A type epoxy resin or bisphenol-s epoxy resin.
4. soft package lithium battery anti-corrosion protective film as claimed in claim 1 or 2, it is characterized in that, described phenolic resins is rosin modified phenolic resin or dimethylbenzene phenol-formaldehyde resin modified.
5. soft package lithium battery anti-corrosion protective film as claimed in claim 1 or 2, it is characterized in that, described solvent is the composition of acetone and butyl acetate, and the weight ratio of described acetone and butyl acetate is (8 ~ 12): 1.
6. prepare as arbitrary in claim 1 ~ 5 as described in the method for soft package lithium battery anti-corrosion protective film, it is characterized in that, comprise the following steps:
(1) preparation of diaphragm liquid: add epoxy resin, phenolic resins and polyvinyl butyral resin in solvent, uses vinegar acid for adjusting pH to be 5 ~ 6, is heated to 55 ~ 65 DEG C, stirs 20 ~ 40min; Stop heating, continue to add solvent to adjust system viscosity for 3000 ~ 10000cps, then stir 10 ~ 20min and obtain diaphragm liquid;
(2) preparation of diaphragm: used by diaphragm liquid obtained in step (1) spray gun even application on soft package lithium battery battery core surface; to leave standstill at normal temperatures or 80 ~ 90 DEG C of bakings leave standstill to diaphragm liquid dry under vacuum conditions, namely form diaphragm on soft package lithium battery battery core surface.
7. the application of the soft package lithium battery anti-corrosion protective film as described in as arbitrary in claim 1 ~ 5 in soft package lithium battery is produced, it is characterized in that, in flexible package lithium cell assembling process, after battery core just seals operation, increase described soft package lithium battery anti-corrosion protective film on battery core surface; Subsequently according to normal running procedures; Before soft package lithium battery finally detects warehouse-in, use ethanol to be sprayed on described soft package lithium battery anti-corrosion protective film, described soft package lithium battery anti-corrosion protective film can be torn.
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| TWI694631B (en) * | 2018-06-22 | 2020-05-21 | 日商古河電池股份有限公司 | Lead-acid battery and method for preventing rust of lead-acid battery terminal |
| CN112670680A (en) * | 2020-12-23 | 2021-04-16 | 惠州市恒泰科技股份有限公司 | Electrolyte infiltration method of soft package battery, soft package battery and preparation method of soft package battery |
| CN113894957A (en) * | 2021-10-29 | 2022-01-07 | 芜湖徽氏新材料科技有限公司 | Solvent-resistant protective film glue solution and preparation equipment and preparation method thereof |
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| CN112670680A (en) * | 2020-12-23 | 2021-04-16 | 惠州市恒泰科技股份有限公司 | Electrolyte infiltration method of soft package battery, soft package battery and preparation method of soft package battery |
| CN112670680B (en) * | 2020-12-23 | 2023-06-16 | 惠州市恒泰科技股份有限公司 | Electrolyte infiltration method of soft-package battery, soft-package battery and preparation method of soft-package battery |
| CN113894957A (en) * | 2021-10-29 | 2022-01-07 | 芜湖徽氏新材料科技有限公司 | Solvent-resistant protective film glue solution and preparation equipment and preparation method thereof |
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