CN204991817U - Composite construction's lithium ion battery diaphragm - Google Patents
Composite construction's lithium ion battery diaphragm Download PDFInfo
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- CN204991817U CN204991817U CN201520611017.0U CN201520611017U CN204991817U CN 204991817 U CN204991817 U CN 204991817U CN 201520611017 U CN201520611017 U CN 201520611017U CN 204991817 U CN204991817 U CN 204991817U
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- tissuemat
- lithium ion
- ion battery
- coating
- composite construction
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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 utility model discloses a composite construction's lithium ion battery diaphragm, it is including the polypropylene microporous membrane, adjacent two -layer be provided with at least one deck low molecular weight polyethylene coating between the polypropylene microporous membrane, low molecular weight polyethylene coating is in on the surface of polypropylene microporous membrane, the thickness of low molecular weight polyethylene coating is 1 mu m-10 mu m, the thickness of polypropylene microporous membrane is 12-40 mu m. The problem that the horizontal vertical heat shrinkage of obturator temperature high temperature and antioxidant activity can not compromise has simultaneously been solved to this lithium ion battery diaphragm.
Description
Technical field
The utility model belongs to technical field of lithium ion, is specifically related to a kind of lithium ion battery separator of composite construction.
Background technology
The closed pore temperature of lithium ion battery separator and the fail safe of thermal contraction on battery have important impact.In general, the low inside battery thermal runaway that prevents of closed pore temperature is aggravated further, when the micropore reaching uniform temperature barrier film can be closed, thus has completely cut off the passage of lithium ion mobility and has cut off the generation of cell reaction.The closed pore temperature of lithium ion battery separator depends on the masking raw material selected.For polyalkene diaphragm, the closed pore temperature of dry method PP barrier film is generally at 150 ~ 160 DEG C, and the closed pore temperature of wet method PE barrier film is generally at 120 DEG C ~ 130 DEG C.The closed pore temperature of dry method PP barrier film is high, there is huge hidden danger and limit it to use the fail safe of battery; And the closed pore temperature of wet method PE barrier film comparatively PP barrier film is low, but barrier film transverse and longitudinal percent thermal shrinkage is large and cause easily being short-circuited phenomenon when temperature is more than 130 DEG C time.
Although the broken film temperature that the PP/PE/PP trilamellar membrane of Celgard company of the current U.S. has closed pore effect keep PP barrier film at 135 DEG C simultaneously, the high-temperature hot contraction of barrier film is subject to the impact of PE layer very greatly, the percent thermal shrinkage about 35 ~ 40% of 150 DEG C/30min.In addition, oxidizable phenomenon is there is in the barrier film of polyethylene material in battery use procedure, although the polyethylene diagrams of double spread aluminium oxide nano material can effectively address this problem, affect fail safe owing to there being the supporting role closed pore temperature of aluminium oxide nano material to improve.
Utility model content
The utility model proposes a kind of lithium ion battery separator of composite construction, this lithium ion battery separator solves the problem that closed pore temperature high temperature transverse and longitudinal percent thermal shrinkage and non-oxidizability can be taken into account simultaneously.
The technical solution of the utility model is achieved in that
A kind of lithium ion battery separator of composite construction, comprise microporous polypropylene membrane, at least one layers of polyethylene wax coating is provided with between microporous polypropylene membrane described in adjacent two layers, described Tissuemat E coating is coated on the outer surface of described microporous polypropylene membrane, the thickness of described Tissuemat E coating is 1 μm ~ 10 μm, and the thickness of described microporous polypropylene membrane is 12 ~ 40 μm.
Further, the number of plies quantity of described Tissuemat E coating is layer 2-4.
Further, the Tissuemat E that described Tissuemat E coating is 0.2 ~ 1.0 μm by particle diameter sprays and forms, the fusing point average out to of described Tissuemat E 95 ~ 135 DEG C.
The beneficial effects of the utility model:
The lithium ion battery separator of the utility model composite construction, arranges Tissuemat E coating and can play the effect reducing closed pore temperature, do not affect again the high-temperature hot shrinkage of barrier film simultaneously, substantially increase the security performance of barrier film between two layers of polypropylene microporous barrier; In addition, this structure can prevent microporous polypropylene membrane easily oxidized in battery use procedure, is conducive to the useful life extending battery.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the lithium ion battery separator of the utility model composite construction.
Accompanying drawing indicates: 1, microporous polypropylene membrane, and 2, Tissuemat E coating.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment 1
With reference to Fig. 1, a kind of lithium ion battery separator of composite construction, comprises microporous polypropylene membrane 1, is provided with two layers of polyethylene wax coating 2 between adjacent two layers microporous polypropylene membrane 1, and Tissuemat E coating 2 is coated on the outer surface of microporous polypropylene membrane 1.The thickness of Tissuemat E coating 2 is 10 μm, and particle diameter is that the Tissuemat E spraying of 1.0 μm forms, the fusing point average out to of Tissuemat E 105 DEG C.The thickness of microporous polypropylene membrane 1 is 12 μm.
Embodiment 2
A lithium ion battery separator for composite construction, comprises microporous polypropylene membrane 1, is provided with 4 layers of polyethylene wax coatings 2 between adjacent two layers microporous polypropylene membrane 1.Tissuemat E coating 2 is coated on the outer surface of microporous polypropylene membrane 1.The thickness of Tissuemat E coating 2 is 1 μm, and particle diameter is that the Tissuemat E spraying of 0.2 μm forms, the fusing point average out to of Tissuemat E 95 DEG C.The thickness of microporous polypropylene membrane 1 is 40 μm.
Embodiment 3
A lithium ion battery separator for composite construction, comprises microporous polypropylene membrane 1, is provided with 3 layers of polyethylene wax coatings 2 between adjacent two layers microporous polypropylene membrane 1.Tissuemat E coating 2 is coated on the outer surface of microporous polypropylene membrane 1.The thickness of Tissuemat E coating 2 is 5 μm, and particle diameter is that the Tissuemat E spraying of 0.4 μm forms, the fusing point average out to of Tissuemat E 135 DEG C.The thickness of microporous polypropylene membrane 1 is 30 μm.
Embodiment 4
The preparation of Tissuemat E slurry:
A: calculate according to percentage by weight, the modification dimethicone of 0.3% and the laurilsulfate sodium of 0.5% are dispersed in the deionized water of 69.2%, then the Tissuemat E of 30% dispersion is mixed with Tissuemat E pre-dispersed liquid in aqueous;
B: disperseed by above-mentioned pre-dispersed liquid high-speed emulsifying machine, rotating speed is set to linear velocity 40m/s, and discharging flow controls at 1L/min, is mixed with Tissuemat E dispersion liquid;
C: be that the crosslinked SBR emulsion of 2%-3% and the polyoxyethylene ether of 0.1%-0.3% add in above-mentioned dispersion liquid under high speed dispersion condition by weight ratio, namely dispersion 30min obtains Tissuemat E slurry;
The mode that Tissuemat E slurry utilizes nick version to be coated be coated on 20 μm of polypropylene dry method simple tension membrane surfaces, coating speed controls at 15m/min, and bake out temperature is 50 DEG C, namely obtains the Tissuemat E/PP barrier film of one side coating; Repeat above-mentioned spraying method, Tissuemat E coating 2 that is two-sided or multilayer can be obtained.
Synthesizer hot composition process:
A: the one side being coated with Tissuemat E coating 2 is carried out two-in-one compound as hot composite surface, and unwinding tension is set to 0.2N;
B: arrange two groups of preheat rolls and carry out substep intensification, first group of preheat roll design temperature is 40 ~ 60 DEG C, and second group of preheat roll design temperature is 70 ~ 80 DEG C;
C: the three group of roller carries out hot compound, and roller temperature is set as 98 ~ 102 DEG C, and platen pressure is set to 0.3 ~ 0.6N, and hot recombination velocity is 1 ~ 4m/min, and tension force is set to 0.1 ~ 0.3N;
D: the four group of roller carries out pre-cooled, and roller temperature is set as 60 ~ 70 DEG C;
E: the five group of roller carries out normal temperature cooling;
F: winding tension controls at 0.2 ~ 0.4N, namely obtains lithium ion battery separator of the present utility model.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (3)
1. the lithium ion battery separator of a composite construction, it is characterized in that, comprise microporous polypropylene membrane, at least one layers of polyethylene wax coating is provided with between microporous polypropylene membrane described in adjacent two layers, described Tissuemat E coating is coated on the outer surface of described microporous polypropylene membrane, the thickness of described Tissuemat E coating is 1 μm ~ 10 μm, and the thickness of described microporous polypropylene membrane is 12 ~ 40 μm.
2. the lithium ion battery separator of composite construction according to claim 1, is characterized in that, the number of plies quantity of described Tissuemat E coating is layer 2-4.
3. the lithium ion battery separator of composite construction according to claim 1, is characterized in that, the Tissuemat E that described Tissuemat E coating is 0.2 ~ 1.0 μm by particle diameter sprays and forms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520611017.0U CN204991817U (en) | 2015-08-13 | 2015-08-13 | Composite construction's lithium ion battery diaphragm |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520611017.0U CN204991817U (en) | 2015-08-13 | 2015-08-13 | Composite construction's lithium ion battery diaphragm |
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| Publication Number | Publication Date |
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| CN204991817U true CN204991817U (en) | 2016-01-20 |
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| CN201520611017.0U Active CN204991817U (en) | 2015-08-13 | 2015-08-13 | Composite construction's lithium ion battery diaphragm |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114696038A (en) * | 2020-12-30 | 2022-07-01 | 山东海科创新研究院有限公司 | Polyolefin composite diaphragm coated with organic emulsion, preparation method of polyolefin composite diaphragm and lithium ion battery |
-
2015
- 2015-08-13 CN CN201520611017.0U patent/CN204991817U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114696038A (en) * | 2020-12-30 | 2022-07-01 | 山东海科创新研究院有限公司 | Polyolefin composite diaphragm coated with organic emulsion, preparation method of polyolefin composite diaphragm and lithium ion battery |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Kiln the town of Nanhai District 528225 in Guangdong province Foshan city Yongan Road East seven Fu Industrial Development Zone (Building 3), the first floor (plant 4) Patentee after: FOSHAN YINGBOLAI TECHNOLOGY CO., LTD. Address before: Kiln the town of Nanhai District 528225 in Guangdong province Foshan city Yongan Road East seven Fu Industrial Development Zone (Building 3), the first floor (plant 4) Patentee before: Bracco skill Co., Ltd is full of by Foshan City |