CN110034263A - A kind of surface has the diaphragm and preparation method thereof of asperities - Google Patents
A kind of surface has the diaphragm and preparation method thereof of asperities Download PDFInfo
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- CN110034263A CN110034263A CN201910246861.0A CN201910246861A CN110034263A CN 110034263 A CN110034263 A CN 110034263A CN 201910246861 A CN201910246861 A CN 201910246861A CN 110034263 A CN110034263 A CN 110034263A
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- diaphragm
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- asperities
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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
- 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
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
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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
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- General Chemical & Material Sciences (AREA)
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- Cell Separators (AREA)
- Secondary Cells (AREA)
Abstract
The present invention provides a kind of diaphragm and preparation method thereof of the surface with asperities, including barrier film base material and concave convex texture, the concave convex texture is uniformly distributed in the barrier film base material surface, the design of asperities can increase barrier action of the diaphragm between positive and negative anodes pole piece, reduce the probability of positive and negative anodes short circuit, the specific surface area that can increase diaphragm increases the wellability of electrolyte；And can be compressed under hot pressing condition between concave point and salient point, can space be shunk and be discharged, the thickness of battery body can either be kept to provide the space that can be rebounded again for the expansion of pole piece, reduce the risk of battery core deformation；For compared to the prior art, using present design, do not need in membrane surface coating functions material, preparation process is simple, reduces costs.
Description
Technical field
The present invention relates to technical field of secondary batteries, in particular in particular a kind of diaphragm is that a kind of surface has
Diaphragm of asperities and preparation method thereof.
Background technique
Diaphragm is the important component of lithium ion battery, is the weight for supporting lithium ion battery to complete charge and discharge electrochemical process
Want component.Battery variety is different, and can the diaphragm of use be also different,, accurate in winding process for coiled battery
Control winding tension directly affect thickness and the deformation of battery roll core, if winding speed is too fast, tension is applied to diaphragm
Dynamics is bigger, and battery core is easy to cause to be distorted deformation；If tension is too small, it is easy to cause the pole piece core pulling of core, pole piece occurs
Dislocation.In order to improve deformation problems of the battery in process and during charge and discharge cycles, usually applied in membrane surface
The polymeric coating layer for having high-adhesion is covered, together by positive and negative anodes pole piece tight bond, makes the bonding between pole piece and diaphragm
Power is greater than pole piece expansive force, however the above method had both increased the production cost of isolation film, also influence whether battery internal resistance and
Cycle performance.
Summary of the invention
To solve the above-mentioned problems, the present invention provides the diaphragm that a kind of surface has asperities, including barrier film base material and recessed
Burr road, the concave convex texture are uniformly distributed in the barrier film base material surface；
As a further improvement of the present invention, the height spacing in the concave convex texture between concave point and salient point is 10-50 μm；
As a further improvement of the present invention, the spacing in the concave convex texture between two adjacent concave points and salient point is 10-1000 μ
m；
As a further improvement of the present invention, the barrier film base material includes polyethylene porous membrane, polypropylene-based perforated membrane, non-woven fabrics
One of perforated membrane, polyimide film or multiple combinations；
As a further improvement of the present invention, the original depth of the barrier film base material is 9-30 μm.
A kind of preparation method of diaphragm of the surface with asperities, including be first placed in barrier film base material by traction component
In concave-convex pressing roll mechanism, the bumps pressing roll mechanism includes upper rod wheel and lower roll wheel, and the parameter of concave-convex pressing roll mechanism is then arranged,
The roller common action roll-in up and down is set to go out concave convex texture again, to obtain the isolation film for having concave convex texture to surface；
Further, the parameter of the concave-convex pressing roll mechanism is respectively that the pressure value of upper roll wheel is 0.01-0.1Mpa, up-down rollers
The salient point gap of wheel is 10-50 μm, and hot pressing temperature is 45 DEG C ~ 100 DEG C, and diaphragm tape running speed is 10-40m/min.
Beneficial effect
The present invention mainly extrudes concave convex texture in the barrier film base material upper roller, there is following benefit:
1, barrier action of the diaphragm between positive and negative anodes pole piece can be increased, reduce the probability of positive and negative anodes short circuit,
2, the specific surface area that can increase diaphragm increases the wellability of electrolyte；
3, can be compressed between concave point and salient point under hot pressing condition, space can be shunk and be discharged, can either be protected
The thickness for holding battery body provides the space that can be rebounded again for the expansion of pole piece, reduces the risk of battery core deformation；
4, it for compared to the prior art, using present design, does not need to simplify in membrane surface coating functions material
Preparation process, has saved cost.
Detailed description of the invention
Fig. 1 is the cross-sectional view for the diaphragm that surface of the present invention has asperities
Fig. 2 is the top view for the diaphragm that surface of the present invention has asperities
Fig. 3 is the diaphragm nipping process schematic diagram that surface of the present invention has asperities.
Specific embodiment
As depicted in figs. 1 and 2, the present invention provides a kind of diaphragm of the surface with asperities, including barrier film base material 1, described
1 surface of barrier film base material further includes equally distributed concave convex texture 2；
Further, the concave convex texture 2 is formed using concave-convex 3 roll-in of pressing roll mechanism；As shown in figure 3, include first will be every
Film base material is placed in concave-convex pressing roll mechanism by traction component, and the bumps pressing roll mechanism includes upper rod wheel and lower roll wheel, then
The parameter of concave-convex pressing roll mechanism is set, then the roller common action roll-in up and down is made to go out concave convex texture, to obtain obtaining
Has the isolation film of concave convex texture to surface；
Preferably, the pressure of upper rod wheel 31 is 0.001-0.1Mpa；In the present embodiment, the pressure of the upper rod wheel 31 is
0.001Mpa;
Preferably, temperature is 45 ~ 100 DEG C when concave-convex 3 roll-in of pressing roll mechanism；It is in the present embodiment 45 DEG C；
Preferably, the tape running speed of the concave-convex pressing roll mechanism 3 is 10-40m/min；Tape running speed is 40m/ in the present embodiment
min；
Further, the concave convex texture 2 includes concave point 21 and salient point 22, wherein the height spacing between concave point 21 and salient point 22
It is 10-50 μm；Preferably, the height spacing between concave point 21 and salient point 22 is 10 μm in the present embodiment；
Further, the spacing in the concave convex texture 2 between two adjacent concave points 21 and salient point 22 is 10-1000 μm；Preferably,
The spacing between two adjacent concave points 21 and salient point 22 is 10 μm in the present embodiment；
Further, the barrier film base material 1 includes polyethylene porous membrane, polypropylene-based perforated membrane, non-woven fabrics perforated membrane, polyamides Asia
One of amine film or multiple combinations；
Further, the original depth of the barrier film base material 1 is 9-30 μm, in the present embodiment preferably 9 μm.
Embodiment 1
The preparation of positive plate:
The dry powder example 93:4:3 in mass ratio of nickle cobalt lithium manganate, conductive agent, three kinds of substances of binder is stirred in advance.Measure slurry
The viscosity of material can discharge in 3000-6000mPa., then be coated with drying, roll-in, cutting, production anode on aluminium foil to slurry
Piece.
The preparation of negative electrode tab:
By graphite, conductive agent, thickener, four kinds of substances of binder dry powder example 94:3:1:2 in mass ratio be stirred.It measures
The viscosity of slurry can discharge in 2000-4000mPa., drying is then coated on copper foil to slurry, roll-in is cut, production
Negative electrode tab.
The preparation of coated separator of the present invention:
9um polyethylene diagrams are placed in concave-convex pressing roll mechanism by traction component, adjusting upper pressure wheel pressure parameter is
0.001MPa, the salient point gap of upper roller wheel are 10um, and hot pressing temperature is 45 DEG C, and diaphragm tape running speed is 10m/min.Obtain table
Face has the isolation film of concave convex texture, and surface salient point spacing is 10um, and concave-convex thickness spacing is 10um, and thickness is inclined after diaphragm pressure roller
Difference is 1um.
The preparation of electrolyte:
Lithium hexafluoro phosphate is dissolved in the EC for being 1:2:1 by mass ratio, the in the mixed solvent of DMC, EMC composition obtains electrolyte.
The preparation of lithium battery:
By above-mentioned positive plate, diaphragm and negative electrode tab are wound into battery core, and diaphragm is between adjacent positive plate and negative electrode tab.?
Aluminium pole ears and nickel tab are respectively welded in reserved aluminium foil and copper foil, and as the external interface of charge and discharge, battery core is then placed in aluminium
In plastic-film packing bag, electrolyte is injected in hot pressing, baking, and encapsulated, lithium ion battery is made in chemical conversion, the processes such as partial volume.Its electricity
Pool size are as follows: thickness 4.0mm, width 6.0, length 148mm, capacity 2.0Ah, charging/discharging voltage range 2.8-4.1V.
Embodiment 2
20um polyethylene diagrams are placed in concave-convex pressing roll mechanism by traction component unlike the first embodiment, are pressed in adjusting
Wheel pressure parameter is 0.001MPa, and the salient point gap of upper roller wheel is 10um, and hot pressing temperature is 45 DEG C, and diaphragm tape running speed is
10m/min.The isolation film for having concave convex texture to surface is obtained, surface salient point spacing is 10um, and concave-convex thickness spacing is 10um, every
Thickness deviation is 1um after membrane pressure roller.
Remaining is the same as embodiment 1.
Embodiment 3
25um polyethylene diagrams are placed in concave-convex pressing roll mechanism by traction component unlike the first embodiment, are pressed in adjusting
Wheel pressure parameter is 0.01MPa, and the salient point gap of upper roller wheel is 100um, and hot pressing temperature is 55 DEG C, and diaphragm tape running speed is
20m/min.The isolation film for having concave convex texture to surface is obtained, surface salient point spacing is 100um, and concave-convex thickness spacing is 28um,
Thickness deviation is 25um after diaphragm pressure roller.
Remaining is the same as embodiment 1.
Embodiment 4
25um polypropylene diaphragm is placed in concave-convex pressing roll mechanism by traction component unlike the first embodiment, is pressed in adjusting
Wheel pressure parameter is 0.02MPa, and the salient point gap of upper roller wheel is 200um, and hot pressing temperature is 65 DEG C, and diaphragm tape running speed is
20m/min.The isolation film for having concave convex texture to surface is obtained, surface salient point spacing is 200um, and concave-convex thickness spacing is 30um,
Thickness deviation is 5um after diaphragm pressure roller.
Remaining is the same as embodiment 1.
Embodiment 5
12um polyethylene diagrams are placed in concave-convex pressing roll mechanism by traction component unlike the first embodiment, are pressed in adjusting
Wheel pressure parameter is 0.02MPa, and the salient point gap of upper roller wheel is 300um, and hot pressing temperature is 65 DEG C, and diaphragm tape running speed is
20m/min.The isolation film for having concave convex texture to surface is obtained, surface salient point spacing is 30um, and concave-convex thickness spacing is 17um, every
Thickness deviation is 5um after membrane pressure roller.
Remaining is the same as embodiment 1.
Embodiment 6
25umPET nonwoven cloth diaphragm is placed in concave-convex pressing roll mechanism by traction component unlike the first embodiment, in adjusting
Pinch roller pressure parameter is 0.03MPa, and the salient point gap of upper roller wheel is 500um, and hot pressing temperature is 70 DEG C, and diaphragm tape running speed is
30m/min.The isolation film for having concave convex texture to surface is obtained, surface salient point spacing is 500um, and concave-convex thickness spacing is 31um,
Thickness deviation is 6um after diaphragm pressure roller.
Remaining is the same as embodiment 1.
Embodiment 7
25umPET nonwoven cloth diaphragm is placed in concave-convex pressing roll mechanism by traction component unlike the first embodiment, in adjusting
Pinch roller pressure parameter is 0.03MPa, and the salient point gap of upper roller wheel is 500um, and hot pressing temperature is 80 DEG C, and diaphragm tape running speed is
30m/min.The isolation film for having concave convex texture to surface is obtained, surface salient point spacing is 500um, and concave-convex thickness spacing is 32um,
Thickness deviation is 7um after diaphragm pressure roller.
Embodiment 8
25um polyethylene diagrams are placed in concave-convex pressing roll mechanism by traction component unlike the first embodiment, are pressed in adjusting
Wheel pressure parameter is 0.04MPa, and the salient point gap of upper roller wheel is 1000um, and hot pressing temperature is 90 DEG C, and diaphragm tape running speed is
40m/min.The isolation film for having concave convex texture to surface is obtained, surface salient point spacing is 1000um, and concave-convex thickness spacing is 35um,
Thickness deviation is 10um after diaphragm pressure roller.
Embodiment 9
30um polyimide diaphragm is placed in concave-convex pressing roll mechanism by traction component unlike the first embodiment, in adjusting
Pinch roller pressure parameter is 0.05MPa, and the salient point gap of upper roller wheel is 600um, and hot pressing temperature is 100 DEG C, diaphragm tape running speed
For 40m/min.The isolation film for having concave convex texture to surface is obtained, surface salient point spacing is 600um, and concave-convex thickness spacing is
42um, thickness deviation is 12um after diaphragm pressure roller.
Embodiment 10
30um polyimide diaphragm is placed in concave-convex pressing roll mechanism by traction component unlike the first embodiment, in adjusting
Pinch roller pressure parameter is 0.1MPa, and the salient point gap of upper roller wheel is 700um, and hot pressing temperature is 100 DEG C, and diaphragm tape running speed is
40m/min.The isolation film for having concave convex texture to surface is obtained, surface salient point spacing is 700um, and concave-convex thickness spacing is 50um,
Thickness deviation is 20um after diaphragm pressure roller.
Remaining is the same as embodiment 1.
Comparative example
The difference of diaphragm assembly unlike the first embodiment: by the 25um polyethylene diagrams without any surface treatment carry out lithium from
Sub- battery production.Remaining is the same as embodiment 1.
Embodiment 1 ~ 10 and contrast groups lithium ion battery isolation film preparation parameter are shown in table 1.
Table 1: the preparation parameter of embodiment and contrast groups diaphragm coating:
| Group | Surface is convex Point spacing um | Pressure MPa | Temperature ℃ | Walk belt speed Spend m/ min | Isolation film Material | Diaphragm Thickness um | Diaphragm wave Thickness um | Surface salient point Spacing um | It is thick after pressure roller Spend deviation um |
| Implement Example 1 | 10 | 0.001 | 45 | 10 | Polyethylene | 9 | 10 | 10 | 1 |
| Implement Example 2 | 10 | 0.001 | 45 | 10 | Polyethylene | 20 | 21 | 10 | 1 |
| Implement Example 3 | 100 | 0.01 | 55 | 20 | Polyethylene | 25 | 28 | 100 | 3 |
| Implement Example 4 | 200 | 0.02 | 65 | 20 | Polypropylene | 25 | 30 | 200 | 5 |
| Implement Example 5 | 300 | 0.02 | 65 | 20 | Polyethylene | 12 | 17 | 300 | 5 |
| Implement Example 6 | 500 | 0.03 | 70 | 30 | PET without Woven fabric | 25 | 31 | 500 | 6 |
| Implement Example 7 | 500 | 0.03 | 80 | 30 | PET without Woven fabric | 25 | 32 | 500 | 7 |
| Implement Example 8 | 1000 | 0.04 | 90 | 40 | Polyethylene | 25 | 35 | 1000 | 10 |
| Implement Example 9 | 600 | 0.05 | 100 | 40 | Polyamides is sub- Amine | 30 | 42 | 600 | 12 |
| Implement Example 10 | 700 | 0.1 | 100 | 40 | Polyamides is sub- Amine | 30 | 50 | 700 | 20 |
| Comparison Group | Polyethylene | 25 | 0 |
The embodiment 1 from table 1, in 2,3,5,8 as can be seen that equally use film base material is isolated for polyethylene under the premise of, with
The rising of the pressure and temperature of upper roller wheel, the thickness deviation after isolation film pressure roller is also bigger than normal therewith, this is because upper pressure roller
The pressure increase of wheel, the level of stretch downward to diaphragm will increase, and polyethylene substrate has certain elongation percentage, suitably press
The pore structure of substrate can't be destroyed under power, the deformation of polyethylene belongs to plastic deformation, and the concave convex texture after pressure roller will not produce
Raw elastic deformation, causes concave convex texture to restore.From the adjustment of isolation film tape running speed, with tape running speed promotion not
There can be significant change to the thickness deviation after pressure roller, but the promotion of tape running speed will increase the efficiency of diaphragm preparation.
The diaphragm of embodiment 1 ~ 10 and contrast groups progress permeability test, thermal contraction performance test, puncture resistance are tested,
Tensile strength test.Wherein, 1h is opened by oven that diaphragm is put into 100 DEG C is red when thermal contraction test, test the thermal contraction in the direction MD
Rate；Acquired results such as table 2.
Table 2: the performance test of embodiment 1-10 and contrast groups diaphragm
| Group | Ventilative value s/100mL | It is heat-shrinked % | Puncture strength gf | Tensile strength MPa |
| Embodiment 1 | 181 | 2.0 | 431 | 180 |
| Embodiment 2 | 279 | 1.1 | 510 | 220 |
| Embodiment 3 | 320 | 0.9 | 522 | 235 |
| Embodiment 4 | 300 | 0.9 | 453 | 190 |
| Embodiment 5 | 200 | 0.8 | 469 | 200 |
| Embodiment 6 | 50 | 0.5 | 225 | 89 |
| Embodiment 7 | 52 | 0.5 | 231 | 90 |
| Embodiment 8 | 325 | 0.8 | 543 | 230 |
| Embodiment 9 | 21 | 0.1 | 387 | 75 |
| Embodiment 10 | 25 | 0.1 | 385 | 78 |
| Contrast groups | 315 | 0.8 | 530 | 231 |
As can be seen from Table 2, in the film properties test of being isolated of embodiment 3 and embodiment 8 and contrast groups, the gas permeability of isolation film
Can, it is heat-shrinked, puncture strength and tensile strength have no in the diaphragm that do not processed after concave convex texture is processed with contrast groups
Significant difference illustrates that the pressure roller parameter of selection can satisfy the performance of isolation film；Meanwhile it being selected in embodiment 6 and embodiment 7
Film base material is isolated in the identical situation of platen pressure in PET non-woven fabrics, the raising of temperature, it will increases concave-convex wave thickness, increases
Thickness deviation after having added pressure roller；The polyimide release film that embodiment 9 and embodiment 10 are selected is in roller temperature the same terms
Under, the pressure of roller wheel will will increase concave-convex wave thickness in change, and the thickness deviation after increasing pressure roller will significantly increase.
The performance test of lithium ion battery made from embodiment 1-10 and contrast groups
By the following method to the lithium ion battery obtained in each embodiment and comparative example carry out following cycle life performance and
The test of cell thickness expansion rate, and test result is listed in table 3.
Circulation volume conservation rate and thickness swelling test: lithium ion battery being used at room temperature the multiplying power of 0.5C charge,
The multiplying power discharging of 0.5C, successively carries out 1000 circulations, the battery capacity under each loop test 0.5C multiplying power, and with before circulation
0.5C capacity under battery room temperature is compared, the capacity retention ratio after calculating circulation.
Capacity retention ratio=(capacity before capacity/circulation after 1000 circulations under 0.5C multiplying power under battery room temperature) ×
100%.
Thickness swelling=(thickness that battery completely fills before the thickness/circulation completely filled after 1000 circulations) × 100%.
The lithium ion battery test result of table 3, embodiment 1-10 and contrast groups
| Group | Thickness deviation um after pressure roller | Cycle-index | Circulation volume conservation rate % | Battery core thickness swelling % |
| Embodiment 1 | 1 | 600 | 76 | Greater than 20% (deformation) |
| Embodiment 2 | 1 | 600 | 78 | Greater than 20% (deformation) |
| Embodiment 3 | 3 | 800 | 80 | 15% (deformation) |
| Embodiment 4 | 5 | 800 | 80 | 15% (deformation) |
| Embodiment 5 | 5 | 800 | 81 | 15% (deformation) |
| Embodiment 6 | 6 | 1000 | 83 | 12% (deformation) |
| Embodiment 7 | 7 | 1000 | 85 | 10% |
| Embodiment 8 | 10 | 1000 | 88 | 8% |
| Embodiment 9 | 12 | 1000 | 86 | 6% |
| Embodiment 10 | 20 | 1000 | 81 | 8% |
| Contrast groups | 0 | 600 | 75 | Greater than 20% (deformation) |
From the results shown in Table 3:
Thickness deviation after the pressure roller of embodiment 1,2 and contrast groups is 1um, during long-term charge and discharge cycles, due to positive and negative
The structure change of pole pole piece causes pole piece to generate expansion, without abundant sky between this 3 experimental group positive and negative anodes pole pieces and isolation film
Between alleviate the expansion of pole piece, cause battery to recycle the deformation just having occurred greater than 20% before 600 weeks, the battery after deformation is just
The contact interface of cathode pole piece and diaphragm continues to deteriorate, and produces analysis lithium, the loss of reversible capacity, and circulation volume conservation rate shifts to an earlier date
Decay to the requirement that client is unsatisfactory for less than 80% to battery cycle life.
It has carried out pressure roller technological parameter to isolation film base material in embodiment 3-6 and has been adjusted, increased isolation membrane pressure
Thickness deviation after roller, circulation volume conservation rate have promotion, this is because thickness deviation copes with the swollen of positive and negative anodes pole piece after at all
Swollen is that different, the circulation expansion amplitude increase in later period, so that the thickness deviation needed is bigger is required with cycle-index increase.
When the thickness deviation of concave convex texture is not enough to cope with the positive and negative anodes pole piece of 600 circulations, the battery risk that deformation occurs will increase
Add.
In embodiment 7-9, the thickness fluctuation after isolation film pressure roller increases to 7-12um, corresponding battery cycle life energy
Power is obviously improved, and the thickness change of battery does not deform less than 10%, can satisfy the requirement of client.Enough pressure rollers
Thickness deviation can generate space more than needed to cope with the pole piece expansion that battery is recycled at 1000 times, together between positive and negative anodes pole piece
When also increase contact specific surface area of the isolation film with electrolyte, optimize the contact interface between electrode so that circulation after hold
Amount conservation rate is promoted.When thickness deviation after 10 middle-grade of embodiment isolation film base material pressure roller reaches 20um, isolation film and pole
Space between piece is excessively sufficient, and the interface spacing that may result in positive and negative anodes pole piece increases, and affects lithium ion in electrolyte
In transmission efficiency, cycle period increase will increase the polarization of battery, so that the circulation volume conservation rate to battery is declined.
In conclusion film base material, which will be isolated, in the present invention forms the diaphragm of concave convex texture on surface by pressing roll mechanism, pass through
Concave convex texture diaphragm after processing is heat-shrinked in permeability, and the aspect of performance such as mechanical strength deteriorate without obvious.Since surface has
The isolation film base material of standby concave convex texture can produce expandable space between inside battery pole piece, how long the battery of phase circulation
Deformation and retain conservation rate improve significantly, thus the security risk caused by also reducing because of cell deformation.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all utilizations
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content is applied directly or indirectly in other correlations
Technical field, similarly include in the invention patent protection scope.
Claims (7)
1. a kind of surface has the diaphragm of asperities, including barrier film base material and concave convex texture, the concave convex texture are uniformly distributed in
The barrier film base material surface.
2. the diaphragm that a kind of surface as described in claim 1 has asperities, which is characterized in that concave point in the concave convex texture
Height spacing between salient point is 10-50 μm.
3. the diaphragm that a kind of surface as described in claim 1 has asperities, which is characterized in that two-phase in the concave convex texture
Spacing between adjacent concave point and salient point is 10-1000 μm.
4. the diaphragm that a kind of surface as described in claim 1 has asperities, which is characterized in that the barrier film base material includes poly-
One of ethylene perforated membrane, polypropylene-based perforated membrane, non-woven fabrics perforated membrane, polyimide film or multiple combinations.
5. the diaphragm that a kind of surface as described in claim 1 has asperities, which is characterized in that the barrier film base material it is initial
With a thickness of 9-30 μm.
6. the preparation method that a kind of surface has the diaphragm of asperities, which is characterized in that including first by barrier film base material by leading
Draw component to be placed in concave-convex pressing roll mechanism, the bumps pressing roll mechanism includes upper rod wheel and lower roll wheel, and concave-convex pressure roller is then arranged
The parameter of mechanism, then the roller common action roll-in up and down is made to go out concave convex texture, have concave convex texture to obtain to surface
Isolation film.
7. the preparation method that a kind of surface as claimed in claim 6 has the diaphragm of asperities, which is characterized in that described recessed
The parameter of convex pressing roll mechanism is respectively that the pressure value of upper roll wheel is 0.01-0.1Mpa, and the salient point gap of upper and lower roller is 10-50 μ
M, hot pressing temperature are 45 DEG C ~ 100 DEG C, and diaphragm tape running speed is 10-40m/min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110993859A (en) * | 2019-12-25 | 2020-04-10 | 武汉中兴创新材料技术有限公司 | Polymer coating diaphragm with improved structure and preparation method thereof |
| CN111354900A (en) * | 2020-05-25 | 2020-06-30 | 比亚迪股份有限公司 | Battery pack, battery module, vehicle and energy storage device |
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| CN102959776A (en) * | 2010-09-29 | 2013-03-06 | 松下电器产业株式会社 | Lithium primary battery and manufacturing method for same |
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| CN202888298U (en) * | 2012-09-28 | 2013-04-17 | 深圳市冠力新材料有限公司 | Lithium battery diaphragm |
| CN202977571U (en) * | 2012-12-06 | 2013-06-05 | 重庆市紫建电子有限公司 | Local processing device for diaphragm |
| CN204946972U (en) * | 2015-07-03 | 2016-01-06 | 陶器 | A kind of battery diaphragm with discontinuous rib |
| CN106531961A (en) * | 2017-01-13 | 2017-03-22 | 欣旺达电子股份有限公司 | Electrode pole plate of lithium ion battery, pole plate rolling device and lithium ion battery |
| CN106684295A (en) * | 2017-01-23 | 2017-05-17 | 山东通用玻纤有限公司 | Point pressure type glass fiber partition plate with capabilities of absorbing and adsorbing electrolyte and production process thereof |
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| CN208460853U (en) * | 2018-04-11 | 2019-02-01 | 欣旺达电子股份有限公司 | Diaphragm and lithium ion battery |
| CN210325958U (en) * | 2018-09-08 | 2020-04-14 | 江西安驰新能源科技有限公司 | Diaphragm for secondary battery and secondary battery |
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Application publication date: 20190719 |