CN207199726U - A kind of multilayer lithium battery diaphragm - Google Patents
A kind of multilayer lithium battery diaphragm Download PDFInfo
- Publication number
- CN207199726U CN207199726U CN201721306659.5U CN201721306659U CN207199726U CN 207199726 U CN207199726 U CN 207199726U CN 201721306659 U CN201721306659 U CN 201721306659U CN 207199726 U CN207199726 U CN 207199726U
- Authority
- CN
- China
- Prior art keywords
- barrier film
- lithium battery
- inorganic coating
- lower floor
- upper strata
- 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.)
- Expired - Fee Related
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Classifications
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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 kind of multilayer lithium battery diaphragm, including：Upper strata barrier film, lower floor's barrier film and inorganic coating, described inorganic coating two sides are bonded with upper strata barrier film and lower floor's barrier film respectively.The utility model is bonded upper strata barrier film and lower floor's barrier film on inorganic coating two sides respectively, increase membrane thicknesses, inorganic coating is sandwiched in internal layer, greatly increase the security of barrier film, caused voltage declines fast bad phenomenon during lithium battery manufacturing process and use is greatly lowered, and improves the self-discharge phenomenon of particularly power lithium battery.The utility model has the advantages that simple in construction, safe, using effect is good.
Description
Technical field
Lithium battery diaphragm technical field is the utility model is related to, specially a kind of multilayer lithium battery diaphragm.
Background technology
Four big critical materials of lithium battery are positive electrode, negative material, electrolyte and barrier film.The major function of barrier film
It is to isolate both positive and negative polarity and prevent electronics and negatively charged solvate molecule from passing through, while lithium ion can be allowed by so as to complete
Into quick transmission of the lithium ion between both positive and negative polarity in charge and discharge process.The quality of membrane properties is directly affected in battery
Resistance, discharge capacity, cycle life, high rate performance and security performance.
Lithium battery diaphragm is a kind of porous pore type plastic sheeting, including several classes such as weaving film, nowoven membrane.Due to polyene
Hydrocarbon material has the characteristics that excellent intensity (tensile strength and puncture strength), corrosion resistance, the lithium battery of commercialization at present every
Film is mainly MIcroporous polyolefin film, including polyethylene (PE) monofilm, polypropylene (PP) monofilm, and tri- layers of PP/PE/PP multiple
Close film.
Barrier film is most important to battery safety, and when battery is under hot environment, barrier film can shrink, and cause both positive and negative polarity
Piece contact and it is short-circuit, cause battery steep temperature rise in addition cause it is on fire, explode etc. hidden danger.Battery is extruded by external force, pierced simultaneously
In the case of wearing, both positive and negative polarity also easily contacts, and instantaneous short circuit can also occur for battery, not only cause potential safety hazard, also result in battery
Voltage decrease speed is fast and causes self-discharge of battery excessive.Existing PP or PE barrier films be not easy high temperature resistant (under high temperature shrink compared with
Greatly, positive/negative plate is caused) and low puncture strength.Therefore, the security of lithium battery, which usually requires that, has higher resistance to thermal contraction
Performance and higher puncture strength.
Utility model content
The purpose of this utility model is to provide a kind of multilayer lithium battery diaphragm, to solve what is proposed in above-mentioned background technology
Problem.
To achieve the above object, the utility model provides following technical scheme：A kind of multilayer lithium battery diaphragm, including：On
Layer barrier film, lower floor's barrier film and inorganic coating, described inorganic coating two sides are bonded with upper strata barrier film and lower floor's barrier film respectively.
Preferably, the thickness of described inorganic coating is 1~4 micron.
Preferably, described upper strata barrier film is spandex film.
Preferably, described lower floor's barrier film is tunica fibrosa.
Preferably, described inorganic coating is inorganic slurry layer.
Compared with prior art, the beneficial effects of the utility model are：The utility model pastes respectively on inorganic coating two sides
Layer barrier film and lower floor's barrier film are closed, increases membrane thicknesses, and because inorganic coating is sandwiched in internal layer, greatly increases barrier film
Security (thermal shrinkage energy and puncture strength), is greatly lowered caused short circuit during lithium battery manufacturing process and use
Phenomenon, improve the self-discharge phenomenon of lithium battery and reduce potential safety hazard.
Lithium battery diaphragm of the present utility model, the more conventional lithium battery diaphragm of its air permeability (PP, PE, PP and PE meet) is low,
Battery high rate performance is more preferable.
Lithium battery diaphragm of the present utility model, because electrolyte immersion adhesive is corroded during battery use,
It also will not fall off between each layer, thus do not interfere with the performance of battery product.
Certainly, implementing any product of the present utility model must be not necessarily required to reach all the above technology effect simultaneously
Fruit.
The utility model has the advantages that simple in construction, safe, using effect is good.
Brief description of the drawings
Fig. 1 is the utility model overall structure diagram；
In figure：1- inorganic coatings；2- upper stratas barrier film；3- lower floors barrier film.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Referring to Fig. 1, the utility model provides a kind of multilayer lithium battery diaphragm, multilayer lithium battery diaphragm structure includes：On
Layer barrier film 2, lower floor's barrier film 3 and inorganic coating 1, the two sides of inorganic coating 1 are bonded with upper strata barrier film 2 and lower floor's barrier film 3 respectively.
In the present embodiment, upper strata barrier film 2 and lower floor's barrier film 3 can select identical film body, such as the two be all spandex film or
Tunica fibrosa, or upper strata barrier film 2 select different film bodies from lower floor barrier film 3, and if upper strata barrier film 2 is spandex film, lower floor's barrier film 3 is then
For tunica fibrosa, or upper strata barrier film 2 is tunica fibrosa, and lower floor's barrier film 3 is then spandex film, and BaTiO can be selected in inorganic slurry layer 13、
The materials such as AlN, Zr (SiO4).
In a wherein preferred embodiment, the thickness of inorganic coating 1 is 1~4 micron, material BaTiO3, upper strata barrier film
It is not especially limited with the thickness of lower floor barrier film.
In a wherein preferred embodiment, upper strata barrier film 2 is spandex film, it is preferable that upper strata membrane thicknesses are 6~10 micro-
Rice.
In a wherein preferred embodiment, lower floor's barrier film 3 is tunica fibrosa, it is preferable that lower floor's membrane thicknesses are 6~10 micro-
Rice.
In multilayer lithium battery diaphragm, the thickness of upper strata barrier film and the thickness of lower floor's barrier film are all higher than the thickness of inorganic coating,
The thickness of upper strata barrier film and the thickness of lower floor's barrier film can be with identical, can also be different, such as：Thickness, the inorganic coating of upper strata barrier film
Thickness and the thickness of lower floor's barrier film set successively using following：(1) upper strata membrane thicknesses are 7 microns, inorganic coating thickness
For 3 microns, lower floor's membrane thicknesses are 7 microns；(2) upper strata membrane thicknesses are 10 microns, and inorganic coating thickness is 2 microns, lower floor
Membrane thicknesses are 10 microns；(3) upper strata membrane thicknesses are 6 microns, and inorganic coating thickness is 2 microns, and lower floor's membrane thicknesses are 10
Micron.
In general organic polymer barrier film (PP, PE, PP and PE are compound, spandex, fiber, aramid fiber) poor air permeability, causes electricity
Pond high rate performance is not good enough, and inorganic coating has good permeability, and lithium battery high rate performance increases.Simultaneously in ceramic coating
Use binding agent electrolyte resistance corrosion, can prevent because electrolyte immersion and caused by upper lower diaphragm plate come off.
Operation principle：The utility model is bonded upper strata barrier film and lower floor's barrier film respectively on inorganic slurry layer two sides, makes barrier film
Thickness increase, and because inorganic coating is sandwiched in internal layer, greatly increase the security of barrier film, while spandex, fiber, inorganic painting
Layer three material is higher than PP, PE or PP of routine and the puncture strength of PE composites, and lithium battery manufacture can be greatly lowered
Caused short circuit phenomenon during process and use, improve the big self-discharge phenomenon of lithium battery and on fire, blast caused by short circuit
Etc. potential safety hazard.
Spandex, fiber, inorganic coating three material are than PP, PE or PP of routine and the thermal shrinkage of PE composites
Can be good, it can significantly improve under high temperature the positive/negative plate short circuit phenomenon caused by diaphragm retracts, reduce on fire, blast of lithium battery etc.
Potential safety hazard.
Lithium battery diaphragm of the present utility model, because electrolyte immersion cohesive dies down during battery use,
The performance of battery product is not interfered with.
While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art,
It is appreciated that these embodiments can be carried out with a variety of changes in the case where not departing from principle of the present utility model and spirit, repaiied
Change, replace and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.
Claims (5)
1. a kind of multilayer lithium battery diaphragm, including：Upper strata barrier film (2), lower floor's barrier film (3) and inorganic coating (1), its feature exist
In：Described inorganic coating (1) two sides is bonded with upper strata barrier film (2) and lower floor's barrier film (3) respectively.
A kind of 2. multilayer lithium battery diaphragm according to claim 1, it is characterised in that：The thickness of described inorganic coating (1)
Spend for 1~4 micron.
A kind of 3. multilayer lithium battery diaphragm according to claim 1, it is characterised in that：Described upper strata barrier film (2) is ammonia
Synthetic fibre film.
A kind of 4. multilayer lithium battery diaphragm according to claim 1, it is characterised in that：Described lower floor's barrier film (3) is fibre
Tie up film.
A kind of 5. multilayer lithium battery diaphragm according to claim 1, it is characterised in that：Described inorganic coating (1) is nothing
Machine pulp layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721306659.5U CN207199726U (en) | 2017-10-11 | 2017-10-11 | A kind of multilayer lithium battery diaphragm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721306659.5U CN207199726U (en) | 2017-10-11 | 2017-10-11 | A kind of multilayer lithium battery diaphragm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207199726U true CN207199726U (en) | 2018-04-06 |
Family
ID=61786602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721306659.5U Expired - Fee Related CN207199726U (en) | 2017-10-11 | 2017-10-11 | A kind of multilayer lithium battery diaphragm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207199726U (en) |
-
2017
- 2017-10-11 CN CN201721306659.5U patent/CN207199726U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180406 Termination date: 20191011 |
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| CF01 | Termination of patent right due to non-payment of annual fee |