CN107275552A - A kind of lithium ion battery double-sided adhesive barrier film and lithium ion battery - Google Patents
A kind of lithium ion battery double-sided adhesive barrier film and lithium ion battery Download PDFInfo
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- CN107275552A CN107275552A CN201710358258.2A CN201710358258A CN107275552A CN 107275552 A CN107275552 A CN 107275552A CN 201710358258 A CN201710358258 A CN 201710358258A CN 107275552 A CN107275552 A CN 107275552A
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- lithium ion
- barrier film
- ion battery
- mould temperature
- pvdf
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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
-
- 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
- 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
-
- 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 provides a kind of lithium ion battery double-sided adhesive barrier film and lithium ion battery, the lithium ion battery includes basement membrane with double-sided adhesive barrier film, the one side of the basement membrane is coated with the gluing oxidant layer of water system PVDF or can be coated with acrylate resin layer with any material coating including binding agent generation glue in the positive pole batch mixing even material of reaction, the another side of the basement membrane.Using technical scheme, the short circuit ratio of core is reduced, product qualification rate is improved；And battery core hardness is obviously improved, positive flatulence ratio is greatly reduced；Big multiplying power discharging property, the cycle performance of lithium ion battery are improved, service life is longer, relatively reliable.
Description
Technical field
The invention belongs to field of lithium ion battery, more particularly to a kind of lithium ion battery double-sided adhesive barrier film and lithium ion
Battery.
Background technology
The barrier film with adhesive effect mainly has two categories below in the market：
1st, solvent is the PVDF of water system, and the one side or two-sided of basement membrane is coated uniformly on by way of intaglio printing；
2nd, solvent is the PVDF of oil system, and the two-sided of basement membrane is coated in using dip coating manner；
Above-mentioned barrier film be present.The first, the PVDF barrier films and positive pole adhesive effect for applying water system are poor, and positive pole holds
Easy dry linting, easily causes short circuit, flatulence, and the cycle performance of lithium ion battery being fabricated to is bad, big multiplying power discharging property compared with
Difference.Second, oiling system PVDF barrier film due to using dip coating manner, can only coat two-sided, and electrostatic is big, is made in battery
During be easily absorbing dust, on the one hand cause battery to have potential safety hazard, core is easily short-circuit, and the cycle performance of battery
It is bad, qualification rate is on the other hand reduced, increases manufacturing cost.
The content of the invention
For above technical problem, the invention discloses a kind of lithium ion battery double-sided adhesive barrier film and lithium-ion electric
Pond, reduces core short circuit ratio, improves product qualification rate, improves big multiplying power discharging property, the cycle performance of lithium ion battery.
In this regard, the technical solution adopted by the present invention is：
A kind of lithium ion battery double face binding barrier film, it includes basement membrane, and the one side of the basement membrane is coated with water system PVDF
Gluing oxidant layer can connect any material coating including the material of reaction with binding agent generation glue in positive pole batch mixing, the basement membrane
Another side is coated with acrylate resin layer.Using this technical scheme, when having adhesive effect during with positive and negative electrodes in same, significantly carry
High battery core hardness, increases CSAT；Core short circuit ratio is reduced simultaneously, is improved product qualification rate, is improved lithium ion
Big multiplying power discharging property, the cycle performance of battery.
As a further improvement on the present invention, the thickness of the gluing oxidant layer of water system PVDF is 0.5~7 μm.Further,
The thickness of the gluing oxidant layer of water system PVDF is 1~3 μm.
As a further improvement on the present invention, the thickness of the acrylate resin layer is 0.5~7 μm.Further
, the thickness of the acrylate resin layer is 1~3 μm.
As a further improvement on the present invention, the activearm that the adhesive that the gluing oxidant layer of water system PVDF is used is included
It is divided into PVDF, Al2O3, the PVDF and Al2O3Mass ratio be 80:20~40:60, solvent is water.Using this technical side
Case, enters a certain proportion of ceramics in the aqueous PVDF adhesive of the one side of basement membrane and carries out mixed painting, reduce electrostatic, facilitate process system
Make, while reducing the absorption of dust, advantageously reduce core short circuit ratio, improve product qualification rate.
Further, the PVDF and Al2O3Mass ratio be 65:35~50:50.
As a further improvement on the present invention, the activearm that the adhesive that the acrylate resin layer is used is included
It is divided into polyacrylate, solvent is water.
As a further improvement on the present invention, the polyacrylate is ethyl acrylate.
As a further improvement on the present invention, the material of the basement membrane is PP or PE.
The invention also discloses a kind of lithium ion battery, it includes positive pole, negative pole and barrier film as described above, the positive pole
Relative with the one side that barrier film is coated with the gluing oxidant layer of water system PVDF, the negative pole is coated with acrylate resin layer with barrier film
One side it is relative.
As a further improvement on the present invention, the barrier film be coated with the gluing oxidant layer of water system PVDF one side it is relative with positive pole
Winding, first carries out hot pressing, then be cold-pressed after being put it into after fluid injection activation in die cavity to it；During hot pressing, upper mould temperature is less than
Lower mould temperature, upper mould temperature is 64~66 DEG C, and lower mould temperature is 69~71 DEG C, and pressure is 0.04MPa, time 5min；During cold pressing,
15 DEG C of upper and lower mould temperature ＜, pressure is 0.03~0.05MPa；Time 5min.
As a further improvement on the present invention, the barrier film is coated with the one side and negative pole phase of acrylate resin layer
To winding, put it into after fluid injection and activation in die cavity and hot pressing is first carried out to it, then be cold-pressed；During hot pressing, upper mould temperature is low
In lower mould temperature, upper mould temperature is 67~69 DEG C, and lower mould temperature is 70~72 DEG C, and pressure is 0.04MPa, time 5min；Cold pressing
When, 15 DEG C of upper and lower mould temperature ＜, pressure is 0.03~0.05MPa；Time 5min.
Using above-mentioned technical proposal, the finishing coat of barrier film one contains PVDF, in addition one side polyacrylic acid coating ester, both respectively with
Temperature, differing pressure when both positive and negative polarity is bonded is little, only needs a process just can realize and is bonded during positive and negative electrodes in same, easy to operate.
And found by research, pressure difference 0.01MPa, temperature difference 1min, adhesive effect difference is all than larger.
Compared with prior art, beneficial effects of the present invention are：
First, using technical scheme, a certain proportion of ceramics are added in A faces and carry out mixed painting, electrostatic is reduced,
Facilitate process to make, while reducing the absorption of dust, reduce core short circuit ratio, improve product qualification rate.
Second, using technical scheme, battery core hardness is obviously improved, and the two sides of barrier film is same with positive and negative electrode respectively
When having adhesive effect, battery core hardness can be greatly improved, and flatulence ratio is greatly reduced, and increase CSAT.
3rd, using technical scheme, big multiplying power discharging property, the cycle performance of lithium ion battery are improved,
Particularly after the circulation of more than 300 times, capacity attenuation is small, still maintains very high battery capacity, and service life is longer, more
Plus it is reliable.
Brief description of the drawings
Fig. 1 is the structural representation of an embodiment of the present invention.
Structural representation when Fig. 2 is the double-sided adhesive barrier film and positive pole and negative pole assembling of an embodiment of the present invention.
Fig. 3 is that the double-sided adhesive barrier film of an embodiment of the present invention shows with being coiled into the structure of core after positive pole and negative pole assembling
It is intended to.
Fig. 4 is the present invention using being assembled under the barrier film of embodiment 1 and comparative example 1~4, identical both positive and negative polarity system
Lithium ion battery hardness test curve.
Fig. 5 is the present invention using being assembled under the barrier film of embodiment 1 and comparative example 1~4, identical both positive and negative polarity system
Discharge curve of the lithium ion battery under 1.5C multiplying powers, wherein, X-axis is 1.5C/0.2C capacity ratio.
Fig. 6 is the present invention using being assembled under the barrier film of embodiment 1 and comparative example 1~4, identical both positive and negative polarity system
Lithium ion battery 0.5C at room temperature cycle performance curve.
Embodiment
The preferably embodiment to the present invention is described in further detail below.
Embodiment 1
As shown in figure 1, a kind of lithium ion battery double-sided adhesive barrier film, it includes basement membrane 1, and the basement membrane 1 is simultaneously coated
There is the gluing oxidant layer 2 of water system PVDF, form the A faces of barrier film, the another side of the basement membrane 1 is coated with acrylate resin layer 3,
Form the B faces of barrier film.The thickness of the gluing oxidant layer 2 of water system PVDF is 0.5~2 μm, the acrylate resin layer 3
Thickness is 0.5~2 μm.
Wherein, the active component that the adhesive that the gluing oxidant layer of water system PVDF is used is included is PVDF, Al2O3, it is described
PVDF and Al2O3Mass ratio be 80：20, solvent is water.What the adhesive that the acrylate resin layer is used was included
Active component is 100% polyacrylate, and solvent is water.The material of the basement membrane is PE.
Embodiment 2
On the basis of embodiment 1, the another side of the basement membrane is coated with acrylate resin layer, forms barrier film
B faces.The thickness of the gluing oxidant layer of water system PVDF is 1.0~3.0 μm, and the thickness of the acrylate resin layer is 1.0
~3.0 μm.
Wherein, the active component that the adhesive that the gluing oxidant layer of water system PVDF is used is included is PVDF, Al2O3, it is described
PVDF and Al2O3Mass ratio be 40：60, solvent is water.What the adhesive that the acrylate resin layer is used was included
Active component is 100% polyacrylate, and solvent is water.The material of the basement membrane is PE.
Embodiment 3
On the basis of embodiment 1, the another side of the basement membrane is coated with acrylate resin layer, forms barrier film
B faces.The thickness of the gluing oxidant layer of water system PVDF is 1.0~3.0 μm, and the thickness of the acrylate resin layer is 1.0
~3.0 μm.
Wherein, the active component that the adhesive that the gluing oxidant layer of water system PVDF is used is included is PVDF, Al2O3, it is described
PVDF and Al2O3Mass ratio be 50：50, solvent is water.What the adhesive that the acrylate resin layer is used was included
Active component is 100% polyacrylate, and solvent is water.The acrylate is ethyl acrylate.The material of the basement membrane is
PE。
Embodiment 4
Lithium-ion electric is assembled into using the barrier film of 1~embodiment of embodiment 3 and lithium cobaltate cathode, the Carbon anode of identical component
Pond, as shown in Figures 2 and 3, the A faces 20 of the barrier film of positive pole 10 and one are relative, the phase of B faces 40 of the negative pole 30 and another barrier film
It is right, then carry out hot pressing and cold pressing.The hot pressing and cold pressing are concretely comprised the following steps：
According to such as Fig. 2 order, the A faces 20 of the barrier film and positive pole 10 is relative, and B faces 40 are relative with negative pole 30, then
Rectangular lithium ion battery is wound into, hot pressing is first carried out to it after being put it into after fluid injection activation in die cavity, then be cold-pressed；Hot pressing
When, upper mould temperature is less than lower mould temperature, and upper mould temperature is 65 ± 2 DEG C, and lower mould temperature is 70 ± 2 DEG C, and pressure is 0.04MPa, when
Between 5min；During cold pressing, 15 DEG C of upper and lower mould temperature ＜, pressure is 0.03~0.05MPa；Time 5min.
The B faces of the barrier film pass through to put it into die cavity after, fluid injection activation with negative pole relative volume first carries out hot pressing to it,
It is cold-pressed again；During hot pressing, upper mould temperature is less than lower mould temperature, and upper mould temperature is 68 ± 2 DEG C, and lower mould temperature is 72 ± 2 DEG C, pressure
Power is 0.04MPa, time 5min；During cold pressing, 15 DEG C of upper and lower mould temperature ＜, pressure is 0.03-0.05MPa；Time 5min.
Then end-results as shown in figure 3, test it, and test result is as shown in table 1.
Comparative example 1
Lithium ion battery is assembled into using basement membrane PE and positive pole, negative pole, the positive pole and negative pole are same as Example 4, right
It is tested, and test result is as shown in table 1.
Comparative example 2
One side to basement membrane PE coats the gluing oxidant layer of water system PVDF, then that it is just right with positive pole, is assembled together with negative pole
Into lithium ion battery, the uncoated one side of negative pole correspondence barrier film, the positive pole and negative pole are same as Example 4, to lithium-ion electric
Pond is tested, and test result is as shown in table 1.
Comparative example 3
It is then that it is just right with negative pole to basement membrane PE one side coating acrylic tackifier layer, assembled together with positive pole
Into lithium ion battery, the uncoated one side of positive pole correspondence barrier film, the positive pole and negative pole are same as Example 4, to lithium-ion electric
Pond is tested, and test result is as shown in table 1.
Comparative example 4
To basement membrane PE coated on both sides oiliness PVDF, be then assembled into lithium ion battery together with positive pole, negative pole, it is described just
Pole and negative pole are same as Example 4, and lithium ion battery is tested, and test result is as shown in table 1.
The performance comparison table of the 1~embodiment of embodiment 3 of table 1 and 1~comparative example of comparative example 4
The battery core progress pair that the barrier film of 1~embodiment of embodiment 3 and 1~comparative example of comparative example 4 and both positive and negative polarity are assembled into
It is higher compared with the hardness of 1~comparative example of comparative example 4 using the battery core hardness of 1~embodiment of embodiment 3 than finding, as shown in Figure 4.
Data by table 1 are visible, using technical scheme, reduce core short circuit ratio, reduce flatulence ratio, improve
Big multiplying power discharging property, the cycle performance of battery.
Existed using the battery being assembled under the barrier film of embodiment 1 and comparative example 1~4, identical both positive and negative polarity system
Discharge curve under 1.5C multiplying powers is as shown in Figure 5.Using the barrier film of embodiment 1 and comparative example 1~4, identical both positive and negative polarity
The battery being assembled under system 0.5C at room temperature cycle performance curve is as shown in Figure 6.It can be seen that, using the technical side of the present invention
The lithium ion battery of the barrier film assembling of case, with more preferable electricity on high-multiplying power discharge and cycle performance compared with prior art
Performance, after the circulation of more than 300 times, capacity attenuation is small, still maintains very high battery capacity, and service life is longer, more
Plus it is reliable.
Embodiment 5
On the basis of embodiment 4, lithium-ion electric is assembled into using the barrier film and lithium cobaltate cathode, Carbon anode of embodiment 1
Pond, using different combination process, technological parameter is as shown in Table 2 below, and the bond effect contrast under different process also refers to table 2.
The bond effect comparing result of the different heat pressing process of table 2
From upper table, using the heat pressing process of scheme 1, the bond effect of barrier film and positive pole, negative pole is best.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to the present invention's
Protection domain.
Claims (10)
1. a kind of lithium ion battery double-sided adhesive barrier film, it is characterised in that：It includes basement membrane, and the one side of the basement membrane is coated with
The gluing oxidant layer of water system PVDF, the another side of the basement membrane is coated with acrylate resin layer.
2. lithium ion battery according to claim 1 double-sided adhesive barrier film, it is characterised in that：The water system PVDF is gluing
The thickness of oxidant layer is 0.5 ~ 7 μm, and the thickness of the acrylate resin layer is 0.5 ~ 7 μm.
3. lithium ion battery according to claim 1 double-sided adhesive barrier film, it is characterised in that：The water system PVDF is gluing
The active component that the adhesive that oxidant layer is used is included is PVDF, Al2O3, the PVDF and Al2O3Mass ratio be 80:20~
40:60, solvent is water.
4. lithium ion battery according to claim 3 double-sided adhesive barrier film, it is characterised in that：The PVDF and Al2O3's
Mass ratio is 65:35~50:50.
5. lithium ion battery according to claim 1 double-sided adhesive barrier film, it is characterised in that：The polyacrylic acid ester gum
The active component that the adhesive that adhesive layer is used is included is polyacrylate, and solvent is water.
6. lithium ion battery according to claim 5 double-sided adhesive barrier film, it is characterised in that：The polyacrylate is
Polyethyl acrylate.
7. lithium ion battery according to claim 1 double-sided adhesive barrier film, it is characterised in that：The material of the basement membrane is
PP or PE.
8. a kind of lithium ion battery, it is characterised in that：It includes positive pole, negative pole and as described in claim 1 ~ 7 any one
Barrier film, the positive pole is relative with the one side that barrier film is coated with the gluing oxidant layer of water system PVDF, and the negative pole is coated with poly- third with barrier film
The one side of olefin(e) acid ester gum adhesive layer is relative.
9. lithium ion battery according to claim 8, it is characterised in that：The barrier film is coated with the gluing oxidant layer of water system PVDF
One side pass through to put it into die cavity after, fluid injection activation with positive pole relative volume hot pressing first carried out to it, then be cold-pressed；Hot pressing
When, upper mould temperature is less than lower mould temperature, and upper mould temperature is 64 ~ 66 DEG C, and lower mould temperature is 69 ~ 71 DEG C, and pressure is 0.04MPa, when
Between 5min；During cold pressing, 15 DEG C of upper and lower mould temperature ＜, pressure is 0.03 ~ 0.05MPa；Time 5min.
10. lithium ion battery according to claim 9, it is characterised in that：It is gluing that the barrier film is coated with polyacrylate
The one side of oxidant layer is passed through with negative pole relative volume around fluid injection puts it into die cavity after activating and first carries out hot pressing to it, then is cold-pressed；
During hot pressing, upper mould temperature is less than lower mould temperature, and upper mould temperature is 67 ~ 69 DEG C, and lower mould temperature is 70 ~ 72 DEG C, and pressure is
0.04MPa, time 5min；During cold pressing, upper mould temperature be less than lower mould temperature, 15 DEG C of upper and lower mould temperature ＜, pressure be 0.03 ~
0.05MPa；Time 5min.
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| CN201710358258.2A CN107275552A (en) | 2017-05-19 | 2017-05-19 | A kind of lithium ion battery double-sided adhesive barrier film and lithium ion battery |
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| CN112086677A (en) * | 2019-06-13 | 2020-12-15 | 万向一二三股份公司 | Integrated lithium ion battery and preparation method thereof |
| CN112086677B (en) * | 2019-06-13 | 2022-04-12 | 万向一二三股份公司 | Integrated lithium ion battery and preparation method thereof |
| CN112086608B (en) * | 2019-06-13 | 2022-05-13 | 万向一二三股份公司 | Lithium ion battery Janus diaphragm |
| CN114381210A (en) * | 2021-12-20 | 2022-04-22 | 天津力神电池股份有限公司 | Pole piece double-sided protection adhesive tape of lithium ion battery and lithium ion battery |
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