CN108470874A - Improve method, the preparation process of lithium ion battery and the lithium ion battery of battery core extrusion performance - Google Patents
Improve method, the preparation process of lithium ion battery and the lithium ion battery of battery core extrusion performance Download PDFInfo
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- CN108470874A CN108470874A CN201810319519.4A CN201810319519A CN108470874A CN 108470874 A CN108470874 A CN 108470874A CN 201810319519 A CN201810319519 A CN 201810319519A CN 108470874 A CN108470874 A CN 108470874A
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
-
- 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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/431—Inorganic material
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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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/44—Fibrous material
-
- 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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
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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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The present invention relates to lithium ion battery manufacturing fields, specifically, providing a kind of method, the preparation process of lithium ion battery and lithium ion battery improving battery core extrusion performance.Then the method for improving battery core extrusion performance carries out hot pressing in the surface coated with adhesive coating of at least one of diaphragm, positive plate or negative plate to assembled naked battery core.This method can improve the hardness and anti-extrusion intensity of battery core, make battery core not cracky or short circuit, while not interfere with the energy density of battery core and its whole chemical property.
Description
Technical field
The present invention relates to lithium ion battery manufacturing field, in particular to a kind of method improving battery core extrusion performance,
The preparation process and lithium ion battery of lithium ion battery.
Background technology
With the continuous development of new-energy automobile market, to the energy density of lithium ion battery, multiplying power, cycle, safety
Can have a higher requirement, the promotion of energy density require in battery manufacture using thinner base material (copper foil, aluminium foil, diaphragm,
Aluminum plastic film etc.), in general, base material is thinning, and tensile strength, anti-puncture intensity can all occur to weaken accordingly.Battery core squeezes
Test belongs to destructive testing, it is intended that the extrusion process that battery core is generated when simulating vehicle collides, when battery core use is thinner
Base material when, it means that these components are more easy to recurring structure breakage, when damaged positive plate or negative plate pierce diaphragm
When overlap joint, easily cause thermal runaway, and then generate and smolder, catch fire, exploding.
The existing method for improving lithium ion battery extrusion performance is mainly around in the thick base material of use, pole piece coated ceramic
Layer, raising binder content etc..The use of thick base material is intended to improve base material tension and anti-puncture intensity, but can influence the body of battery core
Product energy density, gravimetric energy density.When pole piece coated ceramic layer is intended to diaphragm generation breakage, the ceramics of pole piece apply
Layer remains to play the role of completely cutting off positive and negative electrode contact.Improve binder content, it is intended that improve positive plate coating layer of active substance and gold
The cohesive force for belonging to collector (Al foils) is avoided when pole piece occurs damaged, positive active material coating shedding, the Al foils exposed
It is contacted with the negative electrode active material of full charge state, causes the more violent short-circuit conditions of battery core and (Al foils and completely fill state negative electrode active
Substance contacts, and since contact resistance is small, short circuit thermal is the most violent, dangerous highest).However the above method can bring battery core
The reduction of energy density, capacity, dynamic performance, storage performance.
In view of this, special propose the present invention.
Invention content
The first object of the present invention is to provide a kind of method improving battery core extrusion performance, and this method can improve battery core
Hardness and anti-extrusion intensity, make battery core not cracky or short circuit, while being not significantly affected by the energy density of battery core and its whole
Body chemical property.
The second object of the present invention is to provide a kind of preparation process of lithium ion battery, which includes above-mentioned improvement electricity
The method of core extrusion performance, thus at least there is advantage identical with the above-mentioned method of improvement battery core extrusion performance.
The third object of the present invention is to provide a kind of lithium ion battery, which uses above-mentioned preparation process system
Standby to form, thus chemical property is good, and security performance is high, battery core hardness is high, and battery anti-extrusion intensity is high, not cracky or
Short circuit.
In order to realize that the above-mentioned purpose of the present invention, spy use following technical scheme：
In a first aspect, the present invention provides a kind of methods improving battery core extrusion performance, in diaphragm, positive plate or negative plate
At least one of surface coated with adhesive coating, hot pressing then is carried out to assembled naked battery core.
As further preferred technical solution, adhesive coated, diaphragm and binder are respectively coated in the both sides of diaphragm
Ceramic coating is additionally provided between coating.
As further preferred technical solution, diaphragm include in PE diaphragms, PP diaphragms or polyester fiber non-woven fabric extremely
Few one kind.
It is described adhesive coated including PVDF coatings or SBR coatings as further preferred technical solution.
As further preferred technical solution, the adhesive coated thickness is 1-3 μm.
As further preferred technical solution, ceramic coating is mainly made of ceramic particle and binder；
Preferably, the ceramic particle includes Al2O3、SiO2、TiO2Or BaTiO3At least one of；
Preferably, the binder includes PVDF and/or SBR.
As further preferred technical solution, pressure when hot pressing is 2-6MPa, and temperature is 85-110 DEG C, time 1-
5min；
Preferably, pressure 2-5MPa, temperature are 90-110 DEG C, time 2-5min；
It is further preferred that pressure is 3-5MPa, temperature is 90-105 DEG C, time 2-4min.
Further include the steps that fluid injection after hot-pressing as further preferred technical solution, room temperature stands 24 after fluid injection
~48 hours.
Second aspect, the present invention provides a kind of preparation processes of lithium ion battery, including above-mentioned improvement battery core Squeezing ground
The method of energy.
The third aspect, the present invention provides a kind of lithium ion batteries being prepared using above-mentioned preparation process.
Compared with prior art, beneficial effects of the present invention are：
The method provided by the invention for improving battery core extrusion performance passes through at least one in diaphragm, positive plate or negative plate
Then the surface coated with adhesive coating of kind carries out hot pressing to assembled naked battery core, to：First so that diaphragm and anode
Bond effect between piece and negative plate is stronger, battery core hardness higher, when battery core carries out squeezing test, since battery core hardness increases
Add, on battery core surface when stress, on battery core stress surface the conduction of power faster, help to realize entire stress surface and divide stress, make
Battery core entirety force dispersion, it is more than the resistance of failure of material to avoid local pressure, causes structural failure；Secondly, battery core is hardened
When, it causes battery core to be broken once extruding force is excessive, is more likely formed neat port, reduce and form a large amount of burr, shape at port
It overlaps to cause short-circuit situation at positive and negative electrode；In addition, the bond effect of diaphragm and pole piece enhances, can reduce due to electricity
When core is squeezed deformation, the changing of the relative positions between positive plate and negative plate, and then avoid causing short circuit；In addition, when carrying out hot pressing
Naked battery core can be compressed, thus smaller on the influence of the volume energy density of battery core, while improve battery core Squeezing ground using this method
Can, anode and the ingredient of negative pole structure and electrolyte are not had an impact, to battery core entirety Electrochemical Performances smaller.
The preparation process of lithium ion battery provided by the invention includes the method for above-mentioned improvement battery core extrusion performance, thus extremely
It is few that there is advantage identical with the above-mentioned method of improvement battery core extrusion performance.
Lithium ion battery provided by the invention is prepared using the preparation process of above-mentioned lithium ion battery, the lithium-ion electric
The chemical property in pond is good, and security performance is high, and battery core hardness is high, and battery anti-extrusion intensity is high, not cracky or short circuit.
Description of the drawings
Fig. 1 is the structural schematic diagram of the membrane portions obtained using the method for embodiment 9.
Specific implementation mode
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.It is not specified in embodiment specific
Condition person carries out according to conventional conditions or manufacturer's recommended conditions.
In a first aspect, the present invention provides a kind of methods improving battery core extrusion performance, in diaphragm, positive plate or negative plate
At least one of surface coated with adhesive coating, hot pressing then is carried out to assembled naked battery core.
The method of above-mentioned improvement battery core extrusion performance passes through the surface at least one of diaphragm, positive plate or negative plate
Then coated with adhesive coating carries out hot pressing to assembled naked battery core, to：First so that diaphragm and positive plate and cathode
Bond effect between piece is stronger, battery core hardness higher, when battery core carries out squeezing test, since battery core hardness increases, in electricity
When wicking surface stress, on battery core stress surface the conduction of power faster, help to realize entire stress surface and divide stress, keep battery core whole
Force dispersion, it is more than the resistance of failure of material to avoid local pressure, causes structural failure；Secondly, when battery core is hardened, once it squeezes
Pressure is excessive to cause battery core to be broken, and is more likely formed neat port, reduces and forms a large amount of burr at port, forms positive and negative electrode
It overlaps to cause short-circuit situation；In addition, the bond effect of diaphragm and pole piece enhances, can reduce since battery core is squeezed
When deformation, the changing of the relative positions between positive plate and negative plate, and then avoid causing short circuit；In addition, naked battery core can quilt when carrying out hot pressing
Compression, thus it is smaller on the influence of the volume energy density of battery core, while battery core extrusion performance is improved using this method, not to just
The ingredient of pole and negative pole structure and electrolyte has an impact, to battery core entirety Electrochemical Performances smaller.
It should be understood that above-mentioned " apply in the surface coated with adhesive of at least one of diaphragm, positive plate or negative plate
Layer " refer to, it can be in the surface coated with adhesive coating of diaphragm, positive plate or negative plate；It can also be in diaphragm and positive plate
The surface or diaphragm of the surface of surface, diaphragm and negative plate, positive plate and negative plate, the surface of positive plate and negative plate apply
It covers adhesive coated.Above-mentioned " surface " includes unilateral or both sides, you can at least one of diaphragm, positive plate or negative plate
One-sided coatings it is adhesive coated, can also be in the both sides coated with adhesive of at least one of diaphragm, positive plate or negative plate
Coating.
The mode of above-mentioned " coating " includes but not limited to dip-coating, spraying or spin coating.
Above-mentioned " naked battery core " refers to diaphragm, positive plate and the assembled rear core strueture formed of negative plate, due to not noting also
Enter electrolyte, thus referred to as naked battery core.The present invention is not specially limited the assembling mode of naked battery core, using the routine of this field
Technological means, including but not limited to stacked assembling or takeup type assembling.
In a preferred embodiment, adhesive coated, diaphragm and binder painting are respectively coated in the both sides of diaphragm
It is additionally provided with ceramic coating between layer.After the both sides coated with adhesive coating of diaphragm, diaphragm can be with positive plate and negative plate
Form good bonding, this method simple process, manufactured core strueture is more regular.Diaphragm in preparation process due to existing
Internal stress, apparent thermal pinch can occur for stress release, diaphragm under high temperature environment, so that inside battery positive and negative anodes
Material, which is in direct contact, causes internal short-circuit to generate, and safety failure occurs, and the resistance to of diaphragm can be then effectively improved by the way that ceramic coating is arranged
High temperature properties prevent battery core short circuit occurred inside, and then improve the safety of battery core；In addition ceramic coating can also improve diaphragm and
The wellability of electrolyte between pole piece reduces polarization, improves the cycle performance of battery.
In a preferred embodiment, diaphragm include in PE diaphragms, PP diaphragms or polyester fiber non-woven fabric at least
It is a kind of.Typical but non-limiting above-mentioned diaphragm includes PE diaphragms, PP diaphragms, polyester fiber non-woven fabric, PE diaphragms and PP diaphragms
Composite diaphragm, the composite diaphragm of PE diaphragms and polyester fiber non-woven fabric, the composite diaphragm of PP diaphragms and polyester fiber non-woven fabric,
Or the composite diaphragm of PE diaphragms, PP diaphragms and polyester fiber non-woven fabric.PE (polyethylene, polyethylene) diaphragm answers environment
Power is sensitive, and low temperature resistant opposite PP diaphragms are more preferable.PP (polypropylene, polypropylene) diaphragm is opposite more resistant to high temperature, density ratio PP
Diaphragm is small, fusing point and closed pore temperature ratio PE high, to environmental stress relative insensitivity.Polyester fiber non-woven fabric have low temperature output,
The moderate feature of charging cycle long lifespan, mechanical strength.
In a preferred embodiment, described adhesive coated including PVDF coatings or SBR coatings.PVDF
(Polyvinylidene fluoride, Kynoar) coating is mainly made of PVDF, has coating uniformity good, viscous
The strong advantage of property.SBR (Styrene-butadiene rubber, butadiene-styrene rubber) coating is mainly made of SBR, and viscosity is strong,
Good bond effect can be realized using a small amount of SBR.
In a preferred embodiment, the adhesive coated thickness is 1-3 μm.Above-mentioned adhesive coated thickness
Spend it is typical but non-limiting be 1 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8 μm, 2 μm, 2.2 μm, 2.4 μm, 2.6 μm, 2.8 μm or
3μm.Thickness is too small can be so that bond effect be deteriorated, and thickness is too big may then to cause diaphragm plug-hole, and then influences the power of battery core
Performance is learned, the adhesive coated thickness in this preferred embodiment is the most moderate, not only can guarantee good bond effect, but also energy
Avoid influencing the dynamic performance of battery core.
In a preferred embodiment, ceramic coating is mainly made of ceramic particle and binder.
Preferably, the ceramic particle includes Al2O3、SiO2、TiO2Or BaTiO3At least one of.Above-mentioned ceramic particle
Have the characteristics that heat, chemistry, mechanical stability are good, the expansion of thermal runaway, carries when can prevent high temperature applied to lithium battery diaphragm
The thermal stability of high battery；Secondly the groups lyophily such as-OH of ceramic grain surface is stronger, to improve diaphragm for electrolyte
Wellability.
Preferably, the binder includes PVDF and/or SBR.
In a preferred embodiment, pressure when hot pressing is 2-6MPa, and temperature is 85-110 DEG C, time 1-
5min.The pressure of above-mentioned hot pressing it is typical but non-limiting for 2MPa, 2.5MPa, 3MPa, 3.5MPa, 4MPa, 4.5MPa,
5MPa, 5.5MPa or 6MPa；It is 85 DEG C that above-mentioned temperature is typical but non-limiting, 87 DEG C, 89 DEG C, 90 DEG C, 92 DEG C, 94 DEG C, 96
DEG C, 98 DEG C, 100 DEG C, 102 DEG C, 104 DEG C, 105 DEG C, 106 DEG C, 108 DEG C or 110 DEG C；The above-mentioned time is typical but non-limiting to be
1min, 1.5min, 2min, 2.5min, 3min, 3.5min, 4min, 4.5min or 5min.Using the pressure of above-mentioned hot pressing, temperature
It can make the adhesive coated abundant swelling in naked battery core with the time, enhance cohesive force.
Preferably, pressure 2-5MPa, temperature are 90-110 DEG C, time 2-5min.
It is further preferred that pressure is 3-5MPa, temperature is 90-105 DEG C, time 2-4min.
By the pressure of further preferred hot pressing, temperature and time, adhesive coated cohesive force is advanced optimized, to
Keep the bond effect between diaphragm and pole piece stronger, further increases battery core hardness, avoids causing short circuit etc..
In a preferred embodiment, further include the steps that after hot-pressing fluid injection, after fluid injection room temperature stand 24~
48 hours.Naked battery core hot pressing may cause fluid injection process electrolyte wellability poor, be stood for room temperature by adjusting static conditions
24~48 hours, the effect of impregnation of electrolyte can be reinforced, and then ensure the chemical property of battery core.
Above-mentioned " room temperature " is also referred to as room temperature, refers to 20 ± 5 DEG C；Typical but non-limiting above-mentioned time of repose is 24 small
When, 25 hours, 26 hours, 27 hours, 28 hours, 29 hours, 30 hours, 31 hours, 32 hours, 33 hours, 34 hours, it is 35 small
When, 36 hours, 37 hours, 38 hours, 39 hours, 40 hours, 41 hours, 42 hours, 43 hours, 44 hours, 45 hours, it is 46 small
When, 47 hours or 48 hours.
Second aspect provides a kind of preparation process of lithium ion battery, including above-mentioned improvement electricity in some embodiments
The method of core extrusion performance.The preparation process of above-mentioned lithium ion battery includes the method for above-mentioned improvement battery core extrusion performance, thus
At least there is advantage identical with the above-mentioned method of improvement battery core extrusion performance.
The third aspect provides a kind of lithium-ion electric being prepared using above-mentioned preparation process in some embodiments
Pond.Above-mentioned lithium ion battery is prepared using the preparation process of above-mentioned lithium ion battery, the electrochemistry of the lithium ion battery
Can be good, and security performance is high, battery core hardness is high, and battery anti-extrusion intensity is high, not cracky or short circuit.
With reference to embodiment and comparative example, the present invention will be further described in detail.
Embodiment 1
A method of improving battery core extrusion performance, in the both sides coated with adhesive coating of diaphragm, diaphragm is PE diaphragms, is glued
Knot agent coating is PVDF coatings, and coating layer thickness is 0.5 μm；
Then adhesive coated diaphragm, positive plate and negative plate will are assembled into naked battery core, then to assembled naked electricity
Core carries out hot pressing, and pressure when hot pressing is 10MPa, and temperature is 80 DEG C, time 7min, and room temperature stands 24 hours after fluid injection.
Embodiment 2
A method of improving battery core extrusion performance, as different from Example 1, coating layer thickness is 4 μm.
Embodiment 3
A method of improving battery core extrusion performance, as different from Example 1, coating layer thickness is 1 μm.
Embodiment 4
A method of improving battery core extrusion performance, as different from Example 1, coating layer thickness is 2 μm.
Embodiment 5
A method of improving battery core extrusion performance, as different from Example 1, coating layer thickness is 3 μm.
Coating layer thickness in embodiment 3-5 is in currently preferred range.
Embodiment 6
A method of improving battery core extrusion performance, as different from Example 5, pressure when hot pressing is 2MPa, temperature
It is 110 DEG C, time 1min.
Embodiment 7
A method of improving battery core extrusion performance, as different from Example 5, pressure when hot pressing is 6MPa, temperature
It is 85 DEG C, time 5min.
Embodiment 8
A method of improving battery core extrusion performance, as different from Example 5, pressure when hot pressing is 4MPa, temperature
It is 100 DEG C, time 3min.
The hot pressing condition of embodiment 6-8 is in the preferred scope of the present invention.
Embodiment 9
A method of improving battery core extrusion performance, as different from Example 8, as shown in Figure 1, in diaphragm and binder
Ceramic coating is additionally provided between coating, ceramic coating is mainly made of ceramic particle and binder, and the ceramic particle is
Al2O3, the binder is PVDF.
Embodiment 10
A method of it further includes as different from Example 9 the step of fluid injection after hot-pressing to improve battery core extrusion performance
Suddenly, room temperature stands 48 hours after fluid injection.
Embodiment 11
A method of improving battery core extrusion performance, as different from Example 10, coats and bond in the both sides of positive plate
Agent coating.
Embodiment 12
A method of improving battery core extrusion performance, as different from Example 10, coats and bond in the both sides of negative plate
Agent coating.
Embodiment 13-24
A kind of preparation process of lithium ion battery respectively includes the side of the improvement battery core extrusion performance described in embodiment 1-12
Method.
Comparative example 1
A kind of preparation process of lithium ion battery as different from Example 1, including improves membrane thicknesses to improve battery
The step of extrusion performance, membrane thicknesses are 1.5 times of 1 interval film thickness of embodiment.
Comparative example 2
A kind of preparation process of lithium ion battery is included in positive plate surface coated ceramic layer to improve battery extrusion performance
The step of, the ceramic layer is mainly made of ceramic particle and binder, and the ceramic particle is Al2O3, the binder is
PVDF。
Comparative example 3
A kind of preparation process of lithium ion battery as different from Example 1, including improves binder content in positive plate
With the step of improving battery extrusion performance, binder content is 2 times of binder content in embodiment 1.
Performance test
Use lithium battery grading system to it lithium ion battery that embodiment 13-24 and comparative example 1-3 are prepared respectively
Electrochemical property test is carried out, then carries out extruding test according to GB/T 31485-2015, test result is as shown in table 1.
1 performance of lithium ion battery of table tests table
Although illustrate and describing the present invention with specific embodiment, it will be appreciated that without departing substantially from the present invention's
Many other change and modification can be made in the case of spirit and scope.It is, therefore, intended that in the following claims
Including belonging to all such changes and modifications in the scope of the invention.
Claims (10)
1. a kind of method improving battery core extrusion performance, which is characterized in that at least one of diaphragm, positive plate or negative plate
Surface coated with adhesive coating, hot pressing then is carried out to assembled naked battery core.
2. the method according to claim 1 for improving battery core extrusion performance, which is characterized in that applied respectively in the both sides of diaphragm
Cover it is adhesive coated, diaphragm and it is adhesive coated between be additionally provided with ceramic coating.
3. it is according to claim 1 or 2 improve battery core extrusion performance method, which is characterized in that diaphragm include PE diaphragms,
At least one of PP diaphragms or polyester fiber non-woven fabric.
4. the method according to claim 1 or 2 for improving battery core extrusion performance, which is characterized in that described adhesive coated
Including PVDF coatings or SBR coatings.
5. the method according to claim 1 or 2 for improving battery core extrusion performance, which is characterized in that described adhesive coated
Thickness be 1-3 μm.
6. the method according to claim 2 for improving battery core extrusion performance, which is characterized in that ceramic coating is mainly by ceramics
Particle and binder composition；
Preferably, the ceramic particle includes Al2O3、SiO2、TiO2Or BaTiO3At least one of；
Preferably, the binder includes PVDF and/or SBR.
7. the method according to claim 1 for improving battery core extrusion performance, which is characterized in that pressure when hot pressing is 2-
6MPa, temperature are 85-110 DEG C, time 1-5min；
Preferably, pressure 2-5MPa, temperature are 90-110 DEG C, time 2-5min；
It is further preferred that pressure is 3-5MPa, temperature is 90-105 DEG C, time 2-4min.
8. the method according to claim 1 for improving battery core extrusion performance, which is characterized in that further include note after hot-pressing
The step of liquid, room temperature stands 24~48 hours after fluid injection.
9. a kind of preparation process of lithium ion battery, which is characterized in that improve battery core including claim 1-8 any one of them
The method of extrusion performance.
10. the lithium ion battery being prepared using the preparation process described in claim 9.
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Cited By (6)
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| CN110635133A (en) * | 2019-08-30 | 2019-12-31 | 东莞赣锋电子有限公司 | Quick-charging type lithium ion battery and preparation method thereof |
| CN111293347A (en) * | 2020-04-08 | 2020-06-16 | 湖北亿纬动力有限公司 | Battery production process |
| CN111446482A (en) * | 2020-05-14 | 2020-07-24 | 湖北亿纬动力有限公司 | Assembling method of battery cell module and battery cell module |
| CN111640901A (en) * | 2020-05-26 | 2020-09-08 | 湖南中锂新材料科技有限公司 | Preparation method of lithium ion battery diaphragm, lithium ion battery and preparation method thereof |
| CN112216872A (en) * | 2019-07-10 | 2021-01-12 | 万向一二三股份公司 | Hot-cold pressing equipment of lithium ion battery and hot pressing method of lithium ion battery |
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Application publication date: 20180831 |