CN205104549U - Take intermediate layer lithium battery diaphragm and lithium cell - Google Patents
Take intermediate layer lithium battery diaphragm and lithium cell Download PDFInfo
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- CN205104549U CN205104549U CN201520845813.0U CN201520845813U CN205104549U CN 205104549 U CN205104549 U CN 205104549U CN 201520845813 U CN201520845813 U CN 201520845813U CN 205104549 U CN205104549 U CN 205104549U
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- diaphragm
- lithium battery
- barrier film
- lower floor
- film
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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
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Abstract
The utility model discloses a take intermediate layer lithium battery diaphragm and lithium cell, lithium battery diaphragm is including upper strata diaphragm, lower floor's diaphragm and ceramic thick liquids layer, pottery thick liquids layer two sides laminate respectively upper diaphragm and lower floor's diaphragm. The lithium cell includes lithium battery diaphragm, and lithium battery diaphragm includes: upper strata diaphragm, lower floor's diaphragm and ceramic thick liquids layer, pottery thick liquids layer two sides laminate respectively upper diaphragm and lower floor's diaphragm. The utility model discloses at ceramic thick liquids layer two sides upper diaphragm and the lower floor diaphragm of laminating respectively, make unfamiliar increase in thickness, ceramic thick liquids layer is pressed from both sides at the inlayer, the security of greatly increased diaphragm reduces the short circuit phenomenon of production in lithium battery manufacturing process and the use by a wide margin, improve power type lithium cell especially from electric discharge phenomena.
Description
Technical field
The utility model belongs to lithium battery and manufactures field, specifically, relates to a kind of sandwich lithium battery diaphragm and lithium battery.
Background technology
Four large critical materials of lithium battery are positive electrode, negative material, electrolyte and barrier film.The major function of barrier film is isolation both positive and negative polarity and stops electronics to pass, and ion can be allowed to pass through simultaneously, thus complete the fast transport of lithium ion between both positive and negative polarity in charge and discharge process.The quality of membrane properties directly affects the quality of the internal resistance of cell, discharge capacity, service life cycle and battery safety.Barrier film is thinner, porosity is higher, and the internal resistance of battery is less, and high-rate discharge ability is better.
Lithium battery diaphragm is a kind of porous type plastic film, comprises a few classes such as weaving film, nowoven membrane (nonwoven fabrics), microporous barrier and laminate.Because polyolefine material has excellent mechanical property, chemical stability and relatively inexpensive feature, current commercial lithium battery diaphragm mainly microporous polyolefin film, comprise polyethylene (PE) monofilm, polypropylene (PP) monofilm, and PP/PE/PP sandwich diaphragm.
The microcellular structure of barrier film is most important to battery safety, and when battery is when overcharging or temperature is too high, barrier film can close hole, forms open circuit at inside battery, and Limited Current raises, and prevents temperature from raising further.Existing PP diaphragm closed pore temperature is higher, and fusing-off temperature is also very high simultaneously; The closed pore temperature of PE barrier film and fusing-off temperature are all lower.Fusing-off temperature refers to that, in this temperature or more, barrier film melts contraction completely, and electrode interior short circuit produces high temperature, causes battery to disintegrate and even explodes.Therefore, the fail safe of lithium battery requires to have lower closed pore temperature and higher fusing-off temperature usually.The application of multilayer complex films combines the advantage of the two, and PE can play the effect of fuse wire between two-layer PP, but in PP/PE/PP sandwich diaphragm, between PP and PE, degree of laminating is poor, easily comes off.
Utility model content
In view of this, technical problem to be solved in the utility model there is provided a kind of sandwich lithium battery diaphragm and lithium battery, has Good Security, reduces short circuit phenomenon.
According to first aspect of the present utility model, the utility model provides a kind of sandwich lithium battery diaphragm, comprising: upper strata barrier film, lower floor's barrier film and the ceramic slurry bed of material; Fit upper strata barrier film and lower floor's barrier film respectively in ceramic slurry bed of material two sides.
Wherein in a preferred version, the thickness of the ceramic slurry bed of material is 1 ~ 4 micron.
Wherein in a preferred version, upper strata barrier film is PP film or PE film.
Wherein in a preferred version, lower floor's barrier film is PP film or PE film.
According to second aspect of the present utility model, the utility model provides a kind of lithium battery, comprises lithium battery diaphragm, and lithium battery diaphragm comprises: upper strata barrier film, lower floor's barrier film and the ceramic slurry bed of material; Fit upper strata barrier film and lower floor's barrier film respectively in ceramic slurry bed of material two sides.
Wherein in a preferred version, the thickness of the ceramic slurry bed of material is 1 ~ 4 micron.
Wherein in a preferred version, upper strata barrier film is PP film or PE film.
Wherein in a preferred version, lower floor's barrier film is PP film or PE film.
Compared with prior art, the utility model can obtain and comprise following technique effect:
1) to fit respectively on the ceramic slurry bed of material two sides upper strata barrier film and lower floor's barrier film, membrane thicknesses is increased, and because the ceramic slurry bed of material is sandwiched in internal layer, greatly increase the fail safe of barrier film, significantly reduce the short circuit phenomenon produced in lithium battery manufacture process and use procedure, improve the self-discharge phenomenon of particularly power lithium battery.
2) lithium battery diaphragm of the present utility model, its manufacture process need not change existing apparatus for production line, but uses the lithium battery high-quality more of the utility model lithium battery diaphragm, and fail safe is more reliable.
3) lithium battery diaphragm of the present utility model, even if die down because electrolyte soaks adhesiveness in battery use procedure, also can not affect the performance of battery product.
Certainly, implement arbitrary product of the present utility model must not necessarily need to reach above-described all technique effects simultaneously.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms a part of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structure chart of lithium battery diaphragm in the utility model embodiment.
Embodiment
Describe cooperation drawings and Examples in detail execution mode of the present utility model below, by this to the utility model how application technology means solve technical problem and the implementation procedure reaching technology effect can fully understand and implement according to this.
Please refer to Fig. 1, first the present embodiment provides a kind of sandwich lithium battery diaphragm, and sandwich lithium battery diaphragm structure comprises: upper strata barrier film 2, lower floor's barrier film 3 and the ceramic slurry bed of material 1; Fit upper strata barrier film 2 and lower floor's barrier film 3 respectively in the ceramic slurry bed of material 1 two sides.In the present embodiment, upper strata barrier film 2 can select identical film body, as the two is all PP film with lower floor barrier film 3, or the two is all PE film, or upper strata barrier film 2 selects different film bodies, if upper strata barrier film 2 is PP film from lower floor barrier film 3,3, lower floor's barrier film is PE film, or upper strata barrier film 2 is PE film, 3, lower floor's barrier film is PP film, again or, upper strata barrier film 2 and lower floor's barrier film 3 can also be selected and weave film, nowoven membrane (nonwoven fabrics), microporous barrier and laminate etc.
Wherein in a preferred embodiment, the thickness of the ceramic slurry bed of material 1 is 1 ~ 4 micron.The thickness of upper strata barrier film and lower floor's barrier film does not do concrete restriction.
Wherein in a preferred embodiment, upper strata barrier film 2 is PP film or PE film.Preferably, the thickness of upper strata barrier film is 5 ~ 10 microns.
Wherein in a preferred embodiment, lower floor's barrier film 3 is PP film or PE film.Preferably, lower floor's membrane thicknesses is 5 ~ 12 microns.
In sandwich lithium battery diaphragm, the thickness of upper strata barrier film and the thickness of lower floor's barrier film are all greater than the thickness of the ceramic slurry bed of material, the thickness of upper strata barrier film and the thickness of lower floor's barrier film can be identical, also can be different, as: the thickness of the thickness of upper strata barrier film, the thickness of the ceramic slurry bed of material and lower floor's barrier film adopts following setting successively: (1) upper strata membrane thicknesses is 7 microns, ceramic size layer thickness is 3 microns, and lower floor's membrane thicknesses is 7 microns; (2) upper strata membrane thicknesses is 9 microns, and ceramic size layer thickness is 2 microns, and lower floor's membrane thicknesses is 9 microns; (3) upper strata membrane thicknesses is 6 microns, and ceramic size layer thickness is 2 microns, and lower floor's membrane thicknesses is 12 microns.
PP film closed pore temperature is higher, and fusing-off temperature is also very high simultaneously; The closed pore temperature of PE film and fusing-off temperature are all lower, according to These characteristics, in optimum embodiment, when upper strata barrier film is PP film, PE film then selected by lower floor's barrier film, if when upper strata barrier film is PE film, PP film then selected by lower floor's barrier film, like this, by the bonding of the ceramic slurry bed of material, on the one hand, can prevent upper strata barrier film and lower floor's barrier film from coming off, on the other hand, because general adhesive easily causes diaphragm closed pore, or affect the gas permeability of barrier film, and the ceramic slurry bed of material has good permeability, make barrier film gas permeability unaffected, lithium battery fail safe is increased; The third aspect, also in conjunction with PP film and PE film advantage separately in optimum embodiment, makes the performance of lithium battery diaphragm to optimum.
The present embodiment also provides a kind of lithium battery, comprises lithium battery diaphragm, and lithium battery diaphragm comprises: upper strata barrier film, lower floor's barrier film and the ceramic slurry bed of material; Fit upper strata barrier film and lower floor's barrier film respectively in ceramic slurry bed of material two sides.
Wherein in a preferred embodiment, the thickness of the ceramic slurry bed of material is 1 ~ 4 micron.
Wherein in a preferred embodiment, upper strata barrier film is PP film or PE film.
Wherein in a preferred embodiment, lower floor's barrier film is PP film or PE film.
According to compared with prior art, the utility model can obtain and comprise following technique effect:
1) to fit respectively on the ceramic slurry bed of material two sides upper strata barrier film and lower floor's barrier film, membrane thicknesses is increased, and because the ceramic slurry bed of material is sandwiched in internal layer, greatly increase the fail safe of barrier film, significantly reduce the short circuit phenomenon produced in lithium battery manufacture process and use procedure, improve the self-discharge phenomenon of particularly power lithium battery.
2) lithium battery diaphragm of the present utility model, its manufacture process need not change existing apparatus for production line, but uses the lithium battery high-quality more of the utility model lithium battery diaphragm, and fail safe is more reliable.
3) lithium battery diaphragm of the present utility model, even if die down because electrolyte soaks adhesiveness in battery use procedure, also can not affect the performance of battery product.
Also it should be noted that, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the commodity of a series of key element or system not only comprises those key elements, but also comprise other key elements clearly do not listed, or also comprise by this commodity or the intrinsic key element of system.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within the commodity or system comprising described key element and also there is other identical element.
Above-mentioned explanation illustrate and describes some preferred embodiments of the present utility model, but as previously mentioned, be to be understood that the utility model is not limited to the form disclosed by this paper, should not regard the eliminating to other embodiments as, and can be used for other combinations various, amendment and environment, and can in utility model contemplated scope described herein, changed by the technology of above-mentioned instruction or association area or knowledge.And the change that those skilled in the art carry out and change do not depart from spirit and scope of the present utility model, then all should in the protection range of the utility model claims.
Claims (8)
1. a sandwich lithium battery diaphragm, is characterized in that, comprising: upper strata barrier film, lower floor's barrier film and the ceramic slurry bed of material; Fit described upper strata barrier film and described lower floor barrier film respectively in described ceramic slurry bed of material two sides.
2. sandwich lithium battery diaphragm according to claim 1, is characterized in that, the thickness of the described ceramic slurry bed of material is 1 ~ 4 micron.
3. sandwich lithium battery diaphragm according to claim 1, is characterized in that, described upper strata barrier film is PP film or PE film.
4., according to the arbitrary described sandwich lithium battery diaphragm of claim 1-3, it is characterized in that, described lower floor barrier film is PP film or PE film.
5. a lithium battery, comprises lithium battery diaphragm, it is characterized in that, described lithium battery diaphragm comprises: upper strata barrier film, lower floor's barrier film and the ceramic slurry bed of material; Fit described upper strata barrier film and described lower floor barrier film respectively in described ceramic slurry bed of material two sides.
6. lithium battery according to claim 5, is characterized in that, the thickness of the described ceramic slurry bed of material is 1 ~ 4 micron.
7. lithium battery according to claim 5, is characterized in that, described upper strata barrier film is PP film or PE film.
8., according to the arbitrary described lithium battery of claim 5-7, it is characterized in that, described lower floor barrier film is PP film or PE film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520845813.0U CN205104549U (en) | 2015-10-27 | 2015-10-27 | Take intermediate layer lithium battery diaphragm and lithium cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520845813.0U CN205104549U (en) | 2015-10-27 | 2015-10-27 | Take intermediate layer lithium battery diaphragm and lithium cell |
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| Publication Number | Publication Date |
|---|---|
| CN205104549U true CN205104549U (en) | 2016-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520845813.0U Expired - Fee Related CN205104549U (en) | 2015-10-27 | 2015-10-27 | Take intermediate layer lithium battery diaphragm and lithium cell |
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| CN (1) | CN205104549U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105374969A (en) * | 2015-10-28 | 2016-03-02 | 惠州市吉美泰电子科技有限公司 | Lithium battery diaphragm with interlayer, lithium battery and manufacturing method of lithium battery diaphragm |
-
2015
- 2015-10-27 CN CN201520845813.0U patent/CN205104549U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105374969A (en) * | 2015-10-28 | 2016-03-02 | 惠州市吉美泰电子科技有限公司 | Lithium battery diaphragm with interlayer, lithium battery and manufacturing method of lithium battery diaphragm |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160323 Termination date: 20191027 |
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| CF01 | Termination of patent right due to non-payment of annual fee |