CN206774611U - High life safety-type lithium battery diaphragm - Google Patents
High life safety-type lithium battery diaphragm Download PDFInfo
- Publication number
- CN206774611U CN206774611U CN201720521313.0U CN201720521313U CN206774611U CN 206774611 U CN206774611 U CN 206774611U CN 201720521313 U CN201720521313 U CN 201720521313U CN 206774611 U CN206774611 U CN 206774611U
- Authority
- CN
- China
- Prior art keywords
- layer
- polyimide substrate
- silicon carbide
- porosity
- carbide ceramics
- 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
Links
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)
- Laminated Bodies (AREA)
Abstract
The utility model belongs to technical field of lithium ion, a kind of more particularly to high life safety-type lithium battery diaphragm, including polyimide substrate layer, the side of polyimide substrate layer is provided with silicon carbide ceramics layer, the opposite side of polyimide substrate layer is provided with zirconia ceramic layer, polyimide substrate layer, silicon carbide ceramics layer and zirconia ceramic layer are equipped with micropore, the porosity of silicon carbide ceramics layer is less than the porosity of polyimide substrate layer, the porosity of zirconia ceramic layer is higher than the porosity of polyimide substrate layer, and polyimide substrate layer, the micropore inwall of silicon carbide ceramics layer and zirconia ceramic layer is provided with ptc layer, the fusion temperature of ptc layer is 95~125 DEG C.The utility model makes the porosity in barrier film and cathode contact face less than the porosity with positive contact face by the setting of silicon carbide ceramics layer, zirconia ceramic layer and ptc layer, effectively increases the service life and security performance of lithium battery diaphragm.
Description
Technical field
The utility model belongs to technical field of lithium ion, more particularly to a kind of safety-type lithium battery diaphragm of high life.
Background technology
Nowadays energy and environment problem becomes increasingly conspicuous, and lithium ion battery is as a kind of very important regenerative resource,
As the focus of whole world research.Lithium ion battery have the advantages that it is higher than energy, recycle often, storage time it is long,
Not only such as mobile phone, DV and laptop computer is used widely on a portable electronic device for it, Er Qieguang
It is general to be applied to the big-and-middle-sized electrical equipments such as electric automobile, electric bicycle and electric tool.As lithium ion battery industry is near
Develop and must surge forward over year, the security to Chinese lithium ion battery and service life propose higher requirement in the industry.
The part of lithium ion battery includes electrode, electrolyte, barrier film etc..Barrier film between two of which electrode plays
Critically important effect, it, which will not only be played, separates the two poles of the earth, battery is unlikely to the effect of internal short-circuit, also to play through from
The effect of son, certain porosity can ensure battery diaphragm on the premise of with good transmitance, moreover it is possible to ensure outstanding
Mechanical performance.A part of heat is inevitably produced during battery use, can be always in the event of failure, temperature
Rise, cause inner pressure of battery to be significantly increased, easily explode.This potential safety hazard can to a certain extent by battery every
Film excludes, and has the battery diaphragm of loose structure, can melt when temperature is higher, causes the closing of hole, increase resistance
It is anti-, breaking current, reach safing effect.But common battery diaphragm material selects polyethylene (PE), polypropylene
(PP), fusing point is all below 200 DEG C, self-closing temperature relatively low (130~140 DEG C of the self-closing temperature of PE, 170 DEG C of left sides of the self-closing temperature of PP
It is right), it is higher in cell operating conditions temperature, or when discharge current is excessive, because the thermal inertia of electrolyte acts on, barrier film blocking
Temperature also may proceed to raise after electric current, and when reaching film fail temperature, barrier film can destroy completely, cause internal short-circuit of battery temperature after
Height of continuing rising, so as to cause battery explosion.Therefore we need a kind of battery diaphragm of exotic material to ensure battery higher
At a temperature of safety, while there is excellent permeability and insulating properties again, and polyimide film just becomes lithium ion battery
One of ideal material of middle battery diaphragm.
In addition, when lithium ion battery high current or low temperature charge, lithium metal easily occurs in negative terminal surface and separates out, and should
Process is irreversible.If so charged repeatedly, battery is caused damage, reduces the security of battery.Main cause is graphite
Intercalation potential and lithium sedimentation potential are very close to when a large amount of lithium ions are in graphite cathode surface aggregation, but can not being embedded in stone in time
When layer of ink, it is possible to analyse lithium, so as to cause battery failure, security incident occurs.
In view of this, it is necessory to be improved further to existing barrier film, to improve its service life and security
Energy.
Utility model content
The purpose of this utility model is：In view of the shortcomings of the prior art, there is provided one kind has high safety performance and use
The lithium battery diaphragm in life-span.
To achieve these goals, the utility model is adopted the following technical scheme that：
A kind of high life safety-type lithium battery diaphragm, including polyimide substrate layer, the one of the polyimide substrate layer
Side is provided with silicon carbide ceramics layer, and the opposite side of the polyimide substrate layer is provided with zirconia ceramic layer, and the polyamides is sub-
Amine substrate layer, the silicon carbide ceramics layer and the zirconia ceramic layer are equipped with micropore, the hole of the silicon carbide ceramics layer
Rate is less than the porosity of the polyimide substrate layer, and the porosity of the zirconia ceramic layer is higher than the polyimide base material
The porosity of layer, and the micropore inwall of the polyimide substrate layer, the silicon carbide ceramics layer and the zirconia ceramic layer
Ptc layer is provided with, the fusion temperature of the ptc layer is 95~125 DEG C.
Wherein, silicon carbide ceramics layer is mixed together stirring by silicon-carbide particle, polyacrylic acid and deionized water and slurry is made,
And the side of polyimide substrate layer is coated on by way of silk-screen printing, extrusion coated or intaglio plate coating；And zirconium oxide is made pottery
Enamel coating is then mixed together stirring by zirconia particles, polyacrylic acid and deionized water and slurry is made, and passes through silk-screen printing, extruding
The mode of coating or intaglio plate coating is coated on the opposite side of polyimide substrate layer.
Wherein, ptc material is preferably unformed Tissuemat E, and ptc layer can be configured by the way of dip-coating.
One kind as the utility model high life safety-type lithium battery diaphragm is improved, the hole of the polyimide substrate layer
Gap rate is 40~60%, and the porosity of the silicon carbide ceramics layer is 30~50%, and the porosity of the zirconia ceramic layer is
60~80%.
One kind as the utility model high life safety-type lithium battery diaphragm is improved, the aperture of the silicon carbide ceramics layer
Size is 0.15~1.5 μm, and the pore size of the zirconia ceramic layer is 0.5~2.5 μm, the polyimide substrate layer
Pore size is 0.25~1.8 μm.When the aperture of micropore is too small, it is unfavorable for the shuttle of lithium ion, the transmission of lithium ion can be reduced
Speed；When the aperture of micropore is excessive, the structural stability of barrier film is influenceed, easily causes potential safety hazard.
As the utility model high life safety-type lithium battery diaphragm one kind improve, the polyimide substrate layer it is micro-
Hole shape is in hourglass shape.The micropore of polyimide substrate layer is arranged to hourglass shape, is advantageous to improve the extension liquid moisturizing energy of barrier film
Power.
One kind as the utility model high life safety-type lithium battery diaphragm is improved, the heat conduction of the silicon carbide ceramics layer
Coefficient is 270W/ (mK).
One kind as the utility model high life safety-type lithium battery diaphragm is improved, and the thickness of the ptc layer is
0.05-0.12μm.If ptc layer thickness value is too small, micropore can not be closed in time when reaching its fusion temperature；If PTC materials
Thickness of feed layer value is too high, micropore size can be made to diminish, and reduces the shuttle speed of lithium ion.
One kind as the utility model high life safety-type lithium battery diaphragm is improved, the thickness of the polyimide substrate layer
Spend for 5~25 μm.Polyimide substrate layer thickness value is too small, is unfavorable for improving the heat resistance of barrier film；Polyimide substrate layer
Thickness value is too high, can reduce the energy density of battery.
One kind as the utility model high life safety-type lithium battery diaphragm is improved, the silicon carbide ceramics layer and described
The thickness of zirconia ceramic layer is 1~10 μm.Silicon carbide ceramics layer and zirconia ceramics layer thickness value are too small, are unfavorable for improving
The heat endurance of barrier film；Silicon carbide ceramics layer and zirconia ceramics layer thickness value are too high, can reduce the energy density of battery.
Compared to prior art, the utility model at least has the advantages that：
1) base material of the polyimides as lithium battery diaphragm is used, its heat resistance is relative to traditional PP, PE or PET film
Greatly improve, can be used for a long time at 230 DEG C, and can tolerate up to 400 DEG C of high temperature in short-term.Therefore, it is applied to lithium
In battery, it can be charged using high current, heavy-current discharge can also be carried out to it, charging and discharging currents are current cities
Vender flows more than 2 times of lithium battery.
2) by making the porosity of silicon carbide ceramics layer be less than the porosity of polyimide substrate layer, zirconia ceramic layer
Porosity is higher than the porosity of polyimide substrate layer, thus lithium ion during transfer by carborundum that porosity is relatively low
Ceramic layer stops, slow down the speed that lithium ion migrates to negative pole, and lithium ion is intensive at positive pole or part is intensive in carborundum
In ceramic layer, lithium ion can not be largely collected at negative terminal surface, so as to improve analysis lithium, improve the security of battery.
3) inwall that micropore is equipped with polyimide substrate layer, silicon carbide ceramics layer and zirconia ceramic layer is respectively provided with
Fusion temperature is 95~125 DEG C of ptc layer, because ptc material is a kind of typical material with temperature sensitivity, is surpassed
When crossing its fusion temperature, ptc material melts and closes micropore to prevent electrochemical reaction from further carrying out, and it serves fuse
Effect, the security performance of barrier film has been effectively ensured.
4) by polyimide base material set zirconia ceramic layer can improve barrier film heat resistance and machinery it is strong
Degree, accordingly even when being that the barrier film thermal expansion phenomenon is very small at high temperature, still can keep its shape, be not in blast
Hidden danger, improve the security performance of lithium battery；And carborundum is added on the polyimide base material containing zirconia ceramic layer
Ceramic layer, because carborundum has high thermal conductivity factor, it is thus possible to effectively improve the heat conductivility of barrier film, when battery because by
Puncture, hit, extruding etc. and when hot-spot occurs, silicon carbide ceramics layer can conduction be simultaneously rapidly by heat that barrier film is locally subject to
Whole barrier film is distributed to, thermal contraction locally occurs so as to suppress barrier film, further increases the resistance to elevated temperatures of barrier film.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
In figure：1- polyimide substrate layers；2- silicon carbide ceramics layers；3- zirconia ceramic layers；11st, 21,31- micropores；12、
22nd, 32-PTC material layers.
Embodiment
With reference to embodiment and Figure of description, the utility model is described in further detail, but this practicality
New embodiment not limited to this.
As shown in figure 1, a kind of high life safety-type lithium battery diaphragm, including polyimide substrate layer 1, polyimide base material
The side of layer 1 is provided with silicon carbide ceramics layer 2, and the opposite side of polyimide substrate layer 1 is provided with zirconia ceramic layer 3, polyamides
Imines substrate layer 1, silicon carbide ceramics layer 2 and zirconia ceramic layer 3 are equipped with micropore 11,12,13, the hole of silicon carbide ceramics layer 2
Gap rate is less than the porosity of polyimide substrate layer 1, and the porosity of zirconia ceramic layer 3 is higher than the hole of polyimide substrate layer 1
Gap rate, and the inwall of micropore 11,12,13 of polyimide substrate layer 1, silicon carbide ceramics layer 2 and zirconia ceramic layer 3 is provided with
Ptc layer 21,22,23, the fusion temperature of ptc layer 21,22,23 is 95~125 DEG C；Wherein, ptc material is unformed
Tissuemat E, ptc layer 21,22,23 can be configured by the way of dip-coating.
Wherein, silicon carbide ceramics layer 2 is mixed together stirring by silicon-carbide particle, polyacrylic acid and deionized water and slurry is made
Expect, and the side of polyimide substrate layer 1, gained carbon are coated on by way of silk-screen printing, extrusion coated or intaglio plate coating
The thermal conductivity factor of SiClx ceramic layer 2 is 270W/ (mK)；Similar, zirconia ceramic layer 3 is then by zirconia particles, poly- third
Olefin(e) acid and deionized water are mixed together stirring and slurry are made, and are applied by way of silk-screen printing, extrusion coated or intaglio plate coating
Opposite side of the cloth in polyimide substrate layer 1.
Wherein, need to be relative with negative pole by the face of silicon carbide ceramics layer 2 of barrier film when using the utility model, by barrier film
The face of zirconia ceramic layer 3 is relative with positive pole, and is stacked gradually by the order of positive pole, barrier film, negative pole and be wound into lithium cell.
In the embodiment according to high life of the present utility model safety-type lithium battery diaphragm, polyimide substrate layer 1
Porosity be 40~60%, the porosity of silicon carbide ceramics layer 2 is 30~50%, and the porosity of zirconia ceramic layer 3 is 60
~80%.When porosity is too low, it is unfavorable for the shuttle of lithium ion, battery performance can be influenceed；, can shadow when porosity is too high
The structural stability of barrier film is rung, easily causes potential safety hazard.
In the embodiment according to high life of the present utility model safety-type lithium battery diaphragm, silicon carbide ceramics layer 2
Pore size is 0.15~1.5 μm, and the pore size of zirconia ceramic layer 3 is 0.5~2.5 μm, the hole of polyimide substrate layer 1
Footpath size is 0.25~1.8 μm.When the aperture of micropore 11,12,13 is too small, it is unfavorable for the shuttle of lithium ion, lithium ion can be reduced
Transmission speed；When the aperture of micropore 11,12,13 is excessive, the structural stability of barrier film is influenceed, easily causes potential safety hazard.
In the embodiment according to high life of the present utility model safety-type lithium battery diaphragm, polyimide substrate layer 1
The shape of micropore 11 be in hourglass shape.The micropore 11 of polyimide substrate layer 1 is arranged to hourglass shape, is advantageous to improve the extension of barrier film
Liquid moisture-retaining capacity.
In the embodiment according to high life of the present utility model safety-type lithium battery diaphragm, ptc layer 21,22,
23 thickness is 0.05-0.12 μm.If the thickness value of ptc layer 21,22,23 is too small, when reaching its fusion temperature can not and
When close micropore 11,12,13；If the thickness value of ptc layer 21,22,23 is too high, the aperture of micropore 11,12,13 can be made to diminish, dropped
The shuttle speed of low lithium ion.
In the embodiment according to high life of the present utility model safety-type lithium battery diaphragm, polyimide substrate layer 1
Thickness be 5~25 μm.The thickness value of polyimide substrate layer 1 is too small, is unfavorable for improving the heat resistance of barrier film；It is polyimide-based
The thickness value of material layer 1 is too high, can reduce the energy density of battery.
In the embodiment according to high life of the present utility model safety-type lithium battery diaphragm, the He of silicon carbide ceramics layer 2
The thickness of zirconia ceramic layer 3 is 1~10 μm.Silicon carbide ceramics layer 2 and the thickness value of zirconia ceramic layer 3 are too small, are unfavorable for
Improve the heat endurance of barrier film；Silicon carbide ceramics layer 2 and the thickness value of zirconia ceramic layer 3 are too high, and the energy that can reduce battery is close
Degree.
The announcement and teaching of book according to the above description, the utility model those skilled in the art can also be to above-mentioned realities
The mode of applying is changed and changed.Therefore, the utility model is not limited to embodiment disclosed and described above, right
Some modifications and changes of the present utility model should also be as falling into scope of the claims of the present utility model.In addition, to the greatest extent
Some specific terms have been used in pipe this specification, but these terms are merely for convenience of description, not to the utility model
Form any restrictions.
Claims (8)
- A kind of 1. high life safety-type lithium battery diaphragm, it is characterised in that：It is described polyimide-based including polyimide substrate layer The side of material layer is provided with silicon carbide ceramics layer, and the opposite side of the polyimide substrate layer is provided with zirconia ceramic layer, institute State polyimide substrate layer, the silicon carbide ceramics layer and the zirconia ceramic layer and be equipped with micropore, the silicon carbide ceramics The porosity of layer is less than the porosity of the polyimide substrate layer, and the porosity of the zirconia ceramic layer is higher than the polyamides The porosity of imines substrate layer, and the polyimide substrate layer, the silicon carbide ceramics layer and the zirconia ceramic layer Micropore inwall is provided with ptc layer, and the fusion temperature of the ptc layer is 95~125 DEG C.
- 2. high life safety-type lithium battery diaphragm according to claim 1, it is characterised in that：The polyimide substrate layer Porosity be 40~60%, the porosity of the silicon carbide ceramics layer is 30~50%, the hole of the zirconia ceramic layer Rate is 60~80%.
- 3. high life safety-type lithium battery diaphragm according to claim 1, it is characterised in that：The silicon carbide ceramics layer Pore size is 0.15~1.5 μm, and the pore size of the zirconia ceramic layer is 0.5~2.5 μm, the polyimide base material The pore size of layer is 0.25~1.8 μm.
- 4. high life safety-type lithium battery diaphragm according to claim 1, it is characterised in that：The polyimide substrate layer Micro-pore shape be in hourglass shape.
- 5. high life safety-type lithium battery diaphragm according to claim 1, it is characterised in that：The silicon carbide ceramics layer Thermal conductivity factor is 270W/ (mK).
- 6. high life safety-type lithium battery diaphragm according to claim 1, it is characterised in that：The thickness of the ptc layer Spend for 0.05-0.12 μm.
- 7. high life safety-type lithium battery diaphragm according to claim 1, it is characterised in that：The polyimide substrate layer Thickness be 5~25 μm.
- 8. high life safety-type lithium battery diaphragm according to claim 1, it is characterised in that：The silicon carbide ceramics layer and The thickness of the zirconia ceramic layer is 1~10 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720521313.0U CN206774611U (en) | 2017-05-11 | 2017-05-11 | High life safety-type lithium battery diaphragm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720521313.0U CN206774611U (en) | 2017-05-11 | 2017-05-11 | High life safety-type lithium battery diaphragm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206774611U true CN206774611U (en) | 2017-12-19 |
Family
ID=60650727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720521313.0U Active CN206774611U (en) | 2017-05-11 | 2017-05-11 | High life safety-type lithium battery diaphragm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206774611U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265611A (en) * | 2018-03-12 | 2019-09-20 | 江苏海基新能源股份有限公司 | High-multiplying-power battery diaphragm and lithium ion secondary battery |
-
2017
- 2017-05-11 CN CN201720521313.0U patent/CN206774611U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265611A (en) * | 2018-03-12 | 2019-09-20 | 江苏海基新能源股份有限公司 | High-multiplying-power battery diaphragm and lithium ion secondary battery |
| CN110265611B (en) * | 2018-03-12 | 2024-03-08 | 江苏海基新能源股份有限公司 | High-rate battery diaphragm and lithium ion secondary battery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101796668B (en) | Battery separator and nonaqueous electrolyte battery | |
| CN206774609U (en) | High-temperature-reslithium lithium battery barrier film | |
| JP5090380B2 (en) | Electrode assembly and secondary battery having electrode assembly | |
| CN206619633U (en) | High-penetration binding type lithium battery diaphragm | |
| CN101312244B (en) | Electrode assembly and secondary battery using the electrode assembly | |
| TW518780B (en) | Secondary battery | |
| KR101493584B1 (en) | Electricity supply element and ceramic separator thereof | |
| CN106848383A (en) | A kind of lithium ion battery of high security and preparation method thereof | |
| US7981537B2 (en) | Electrode assembly and secondary battery having the same | |
| WO2000079618A1 (en) | Separator for cell, cell, and method for producing separator | |
| CN104541401A (en) | Solid state battery fabrication | |
| WO2021238952A1 (en) | Anode piece, and preparation method and use therefor in semi-solid state battery | |
| CN105047891A (en) | Preparation method of graphite tin-based composite anode material | |
| CN107452928B (en) | Electric energy supply system and ceramic isolation layer thereof | |
| CN206349443U (en) | A kind of electrodes of lithium-ion batteries | |
| CN104916803A (en) | Laminar inorganic matter-polymer composite membrane capable of improving ion transmission efficiency | |
| CN109841780A (en) | A kind of lithium ion battery separator and its manufacturing method and the lithium ion battery containing this partition | |
| CN105552298B (en) | Large-capacity battery pack with temperature control defencive function | |
| CN104577013A (en) | Water-based ceramic diaphragm slurry and application thereof in lithium ion battery | |
| JP2012199253A (en) | Separator for battery, and nonaqueous electrolyte battery | |
| JP2013125731A (en) | Separator | |
| CN206774611U (en) | High life safety-type lithium battery diaphragm | |
| CN201122622Y (en) | Lithium ion battery septum | |
| WO2023246704A1 (en) | Lithium-ion battery electrode plate and preparation method therefor | |
| CN206134813U (en) | Anodal pole piece of lithium ion battery of quick heat conduction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |