CN205810930U - The lithium battery diaphragm of improvement - Google Patents
The lithium battery diaphragm of improvement Download PDFInfo
- Publication number
- CN205810930U CN205810930U CN201620701793.4U CN201620701793U CN205810930U CN 205810930 U CN205810930 U CN 205810930U CN 201620701793 U CN201620701793 U CN 201620701793U CN 205810930 U CN205810930 U CN 205810930U
- Authority
- CN
- China
- Prior art keywords
- coating
- polyolefin film
- microporous polyolefin
- boehmite
- coated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims abstract description 44
- 238000000576 coating method Methods 0.000 claims abstract description 44
- 229920000098 polyolefin Polymers 0.000 claims abstract description 28
- 229910001593 boehmite Inorganic materials 0.000 claims abstract description 22
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims description 13
- 150000001875 compounds Chemical group 0.000 claims 1
- 239000010410 layer Substances 0.000 claims 1
- 239000002356 single layer Substances 0.000 claims 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 14
- 230000004888 barrier function Effects 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 230000008018 melting Effects 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000002737 fuel gas Substances 0.000 abstract description 2
- 230000009970 fire resistant effect Effects 0.000 abstract 1
- 239000011810 insulating material Substances 0.000 abstract 1
- 239000004743 Polypropylene Substances 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005524 ceramic coating Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000003411 electrode reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000012982 microporous membrane Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 150000004291 polyenes Chemical class 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Cell Separators (AREA)
Abstract
This utility model discloses the lithium battery diaphragm of a kind of improvement, including microporous polyolefin film and the refractory coating being coated in microporous polyolefin film, described refractory coating is boehmite coating, described boehmite coating includes the first coating being coated on front side of microporous polyolefin film and is coated on the second coating on rear side of microporous polyolefin film, the thickness of described first coating is 0.5 4 μm, and the thickness of described second coating is 0.5 4 μm.This utility model is by the coating of both sides before and after microporous polyolefin film boehmite coating, when barrier film is heated, boehmite can resolve into water and aluminium oxide, water can absorb substantial amounts of heat, reduce the surface temperature of microporous polyolefin film, thus suppress microporous polyolefin film by thermal melting, it is to avoid the large area of battery core short circuit, thus improve the security performance of battery；It is a kind of fire-resistant heat insulating material that boehmite decomposes the aluminium oxide generated, and can cool down the fuel gas that reaction generates, it is to avoid heat is delivered to microporous polyolefin film surface.
Description
Technical field
This utility model relates to field of lithium technology, is specifically related to the lithium battery diaphragm of a kind of improvement.
Background technology
It is high that lithium rechargeable battery has running voltage, and specific capacity, specific energy are high, pollution-free, memory-less effect, the life-span
Long, self discharge is little, and safety is good, have extended cycle life and can the advantage such as fast charging and discharging, be widely used in digital electric, electrical equipment
And the product scope such as electric automobile, there is the wide market space and good development prospect.State's inner septum great majority are all at present
It it is the TPO barrier film of the single or multiple lift using polyethylene, polypropylene and polyethylene and polypropylene to combine.Although polyolefin
Barrier film can provide enough mechanical strengths and chemical stability at normal temperatures, but the most then shows bigger heat receipts
Contracting, thus cause both positive and negative polarity contact and gather rapidly big calorimetric.Such as PP/PE composite diaphragm, first PE melt at 120 DEG C
Block the micropore in polymer, block ionic conduction.Now, PP still plays the effect of support, prevents the further of electrode reaction
Occur, but owing to the melting temperature of PP also only has 160 DEG C, when temperature rises rapidly, more than the melt temperature of PP, barrier film melts meeting
Cause large area short circuit and cause thermal runaway, aggravating thermal accumlation, producing inside battery hyperbar, cause cells burst or quick-fried
Fried.For this problem, most domestic uses ceramic coating membrane, coating barrier film to have the temperature tolerance of excellence and high safety
Property.The ceramic diaphragm used on lithium battery market now is mostly in alumina type ceramic diaphragm, and alumina type ceramic diaphragm has
There is the high production equipment easy to wear of hardness, affect the shortcomings such as Stability of Slurry than great free settling, be unfavorable for producing.
Utility model content
This utility model is for the disappearance of prior art existence, it is provided that the lithium battery diaphragm of a kind of improvement, and it can reduce
The production cost of lithium battery, improves the safety of lithium battery.
For achieving the above object, this utility model uses such as purgation technical scheme:
The lithium battery diaphragm of a kind of improvement, including microporous polyolefin film and the heat-resisting painting being coated in microporous polyolefin film
Layer, described refractory coating is boehmite coating, and described boehmite coating includes the first painting being coated on front side of microporous polyolefin film
Layer and be coated on the second coating on rear side of microporous polyolefin film, the thickness of described first coating is 0.5-4 μm, described second coating
Thickness be 0.5-4 μm.
As a kind of preferred version, the particle diameter D50 of the boehmite particles of described first coating is 1.5-2.5 μm, and BET is
3.0-4.5m2/ g, the particle diameter D50 of the boehmite particles of described second coating are 1.5-2.5 μm, and BET is 3.0-4.5m2/g。
As a kind of preferred version, described microporous polyolefin film is single or multiple lift composite construction.
This utility model compared with prior art has clear advantage and beneficial effect, specifically, by polyene
Coating boehmite coating in both sides before and after hydrocarbon microporous membrane, when barrier film is heated, boehmite can resolve into water and aluminium oxide, and water is permissible
Absorb substantial amounts of heat, reduce the surface temperature of microporous polyolefin film, thus suppress microporous polyolefin film by thermal melting, it is to avoid
The large area short circuit of battery core, thus improve the security performance of battery；It is a kind of refractory heat-insulating that boehmite decomposes the aluminium oxide generated
Material, can cool down the fuel gas that reaction generates, it is to avoid heat is delivered to microporous polyolefin film surface；Meanwhile, pass through
Boehmite coating is used to replace traditional ceramic coating, it is possible to reduce the production cost of lithium battery greatly, improve enterprise
Economic benefit；And, make coating by choosing particle diameter boehmite less, evenly so that the hole of coating is closeer, more
Uniformly, and then make barrier film when being heated, heat is more evenly distributed, it is to avoid cause the feelings of diaphragm failures because of local heating
Condition, thus improve the service life of barrier film.
By more clearly illustrating architectural feature of the present utility model, technological means and the specific purposes reached thereof and merit
Can, with specific embodiment, this utility model is described in further detail below in conjunction with the accompanying drawings:
Accompanying drawing explanation
Fig. 1 is the assembling assumption diagram of the embodiment of this utility model.
Accompanying drawing identifier declaration:
10, microporous polyolefin film the 11, first coating the 12, second coating
Detailed description of the invention
As it is shown in figure 1, the lithium battery diaphragm of a kind of improvement, including microporous polyolefin film 10 be coated on microporous polyolefin film
Refractory coating on 10, described microporous polyolefin film 10 is single or multiple lift composite construction.Described refractory coating is that boehmite is coated with
Layer, described boehmite coating includes the first coating 11 being coated on front side of microporous polyolefin film 10 and is coated on microporous polyolefin film
The second coating 12 on rear side of in the of 10, the thickness of described first coating 11 is 0.5-4 μm, and the thickness of described second coating 12 is 0.5-4 μ
m.The particle diameter D50 of the boehmite particles of described first coating 11 is 1.5-2.5 μm, and BET is 3.0-4.5m2/ g, described second is coated with
The particle diameter D50 of the boehmite particles of layer 12 is 1.5-2.5 μm, and BET is 3.0-4.5m2/g。
The above, be only preferred embodiment of the present utility model, not in order to limit this utility model, thus every
Any modification, equivalent substitution and improvement etc. made above example according to technology of the present utility model reality, all still fall within this
In the range of utility model technical scheme.
Claims (3)
1. the lithium battery diaphragm of an improvement, it is characterised in that: include microporous polyolefin film and be coated in microporous polyolefin film
Refractory coating, described refractory coating is boehmite coating, and described boehmite coating includes being coated on front side of microporous polyolefin film
The first coating and be coated on the second coating on rear side of microporous polyolefin film, the thickness of described first coating is 0.5-4 μm, described
The thickness of the second coating is 0.5-4 μm.
The lithium battery diaphragm of improvement the most according to claim 1, it is characterised in that: the boehmite particles of described first coating
Particle diameter D50 be 1.5-2.5 μm, BET is 3.0-4.5m2/ g, the particle diameter D50 of the boehmite particles of described second coating are 1.5-
2.5 μm, BET is 3.0-4.5m2/g。
The lithium battery diaphragm of improvement the most according to claim 1, it is characterised in that: described microporous polyolefin film be monolayer or
Multi-layer compound structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620701793.4U CN205810930U (en) | 2016-07-05 | 2016-07-05 | The lithium battery diaphragm of improvement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620701793.4U CN205810930U (en) | 2016-07-05 | 2016-07-05 | The lithium battery diaphragm of improvement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205810930U true CN205810930U (en) | 2016-12-14 |
Family
ID=58140164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620701793.4U Active CN205810930U (en) | 2016-07-05 | 2016-07-05 | The lithium battery diaphragm of improvement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205810930U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111211278A (en) * | 2018-11-22 | 2020-05-29 | 中航锂电（洛阳）有限公司 | Composite coating diaphragm for lithium ion battery and lithium ion battery |
| CN112020784A (en) * | 2018-12-21 | 2020-12-01 | 株式会社Lg化学 | Separator for electrochemical device and electrochemical device comprising the same |
-
2016
- 2016-07-05 CN CN201620701793.4U patent/CN205810930U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111211278A (en) * | 2018-11-22 | 2020-05-29 | 中航锂电（洛阳）有限公司 | Composite coating diaphragm for lithium ion battery and lithium ion battery |
| CN112020784A (en) * | 2018-12-21 | 2020-12-01 | 株式会社Lg化学 | Separator for electrochemical device and electrochemical device comprising the same |
| CN112020784B (en) * | 2018-12-21 | 2023-12-19 | 株式会社Lg新能源 | Separator for electrochemical device and electrochemical device comprising same |
| US11967731B2 (en) | 2018-12-21 | 2024-04-23 | Lg Energy Solution, Ltd. | Separator for electrochemical device and electrochemical device containing same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240325 Address after: 526000, 2nd Floor, No.2 Qiandong Road, Liantang Town, Gaoyao District, Zhaoqing City, Guangdong Province Patentee after: Guangdong Zhuo High-tech Materials Technology Co.,Ltd. Country or region after: China Address before: 523000 Dongxing Industrial Park, Kangle Road, Hengli Town, Dongguan City, Guangdong Province Patentee before: DONGGUAN ADVANCED ELECTRONIC TECH Co.,Ltd. Country or region before: China |