CN112490588A - Battery isolating membrane and lithium ion battery containing same - Google Patents
Battery isolating membrane and lithium ion battery containing same Download PDFInfo
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- CN112490588A CN112490588A CN202011441464.8A CN202011441464A CN112490588A CN 112490588 A CN112490588 A CN 112490588A CN 202011441464 A CN202011441464 A CN 202011441464A CN 112490588 A CN112490588 A CN 112490588A
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- layer
- coating layer
- mixed coating
- battery
- ceramic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a battery isolating membrane and a lithium ion battery containing the same, wherein the battery isolating membrane comprises an isolating membrane base layer, a first mixed coating layer and a ceramic layer, wherein the first mixed coating layer and the ceramic layer are arranged on two sides of the isolating membrane base layer; and a second mixed coating layer is arranged outside the ceramic layer. The cost of each layer used in the invention is relatively low, and the production cost of the isolating membrane can be effectively reduced; through the reasonable setting of each structural layer outside the base layer, the passing rate of heat abuse and puncture of the electric core and the hardness of the electric core are effectively improved. The first mixed coating layer and the second mixed coating layer are mixed layers, the characteristics of two materials are considered, and the ceramic layer has excellent high temperature resistance, heat shrinkage resistance and puncture strength, so that the safety performance of the battery is improved.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a battery isolating membrane and a lithium ion battery comprising the same.
Background
The isolating membrane used for isolating the positive pole piece and the negative pole piece in the lithium ion secondary battery is generally a single-layer or multi-layer micropore and porous film, is made of Polyethylene (PE), polypropylene (PP) and composite materials thereof, and has the main functions of preventing short circuit between the positive pole piece and the negative pole piece, providing an ion channel and keeping the normal function of electrolyte. With the increasing energy density and the wider application voltage window and temperature range of the lithium ion secondary battery, customers have more and more rigorous requirements on the safety guarantee of the lithium ion secondary battery, and the safety performance of the lithium ion secondary battery becomes a great challenge.
However, the separator made of PE or PP alone (i.e., a single layer) has a low thermal shrinkage temperature and a low rupture temperature, and this simple separator has a low strength that is not sufficient to separate dendrites formed by the positive electrode active material layer of the positive electrode sheet and the negative electrode active material layer of the negative electrode sheet and the positive electrode active material contained in the positive electrode active material layer, and the rapid increase in the resistance of the separator after the separator is shrunk is not favorable for the diffusion of heat generated from the battery cell and the control of thermal runaway, and therefore, it is not considered to be the material having the best safety against thermal runaway.
The isolating membrane adopted in the manufacturing process of the current polymer lithium ion battery can not simultaneously meet the requirements of no deformation of the appearance of a battery core, steel nail puncture and heat abuse performance.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a battery isolating membrane which is economical in material, and capable of improving the passing rate of heat abuse and puncture of a battery core and the hardness of the battery core, and a lithium ion battery comprising the isolating membrane.
The invention is realized by the following modes: a battery isolation film comprises an isolation film base layer, a first mixed coating layer and a ceramic layer, wherein the first mixed coating layer and the ceramic layer are arranged on two sides of the isolation film base layer; and a second mixed coating layer is arranged outside the ceramic layer.
Further, the thickness of barrier film basic unit is any one of 5um, 7um, 9um, 12um, 16 um. The base material can be made from the aspects of cost and performance, and can be made from materials such as Chongqing Newmi, Cangzhou Mingzhu, Suzhou Jieli, Shanghai Enjie, Xinyuan, and imported, such as Asahi formation, Korean SK, Korean w-scope, and Celgard.
Further, the thickness of barrier film basic unit is 7 um.
Further, the first mixed coating layer has an areal density of 1.8 to 2.2g/m 2.
Further, the ceramic layer has an areal density of 2.0-2.4g/m 2.
Further, the second mixed coating layer has an areal density of 1.6 to 2.0g/m 2.
A lithium ion battery comprises a positive electrode, a negative electrode and an isolating membrane arranged between the positive electrode and the negative electrode, wherein the isolating membrane is the isolating membrane; and the winding core after the isolation film, the anode and the cathode are wound is arranged in the aluminum-plastic film shell.
The invention has the beneficial effects that: the cost of each used layer is relatively low, so that the production cost of the isolating membrane can be effectively reduced; through the reasonable setting of each structural layer outside the base layer, the passing rate of heat abuse and puncture of the electric core and the hardness of the electric core are effectively improved. The first mixed coating layer and the second mixed coating layer are mixed layers, the characteristics of two materials are considered, the ceramic has excellent high-temperature resistance, heat-resistant shrinkage performance and puncture strength, the safety performance of the battery is further improved, the ceramic is aluminum oxide, and the aluminum oxide has excellent high-temperature resistance, heat-resistant shrinkage performance and puncture strength, and the safety performance of the battery is further improved. The PVDF (polyvinylidene fluoride) glue has excellent chemical corrosion resistance, high-temperature color change resistance, oxidation resistance, wear resistance, flexibility and high expansion strength and impact strength. The mixed layer can give consideration to the thermal contraction capability and the puncture resistance of the diaphragm and the adhesive force of the diaphragm to the positive and negative pole pieces of the battery cell, thereby improving the heat abuse rate and the puncture passing rate of the battery cell and the hardness of the battery cell. By reducing the area density of the second mixed coating layer to reduce the thickness of the coating layer, the total thickness of the separator can be reduced to improve the energy density of the cell.
The arrangement of the ceramic layer can effectively improve the thermal contraction capability and the puncture resistance of the diaphragm, thereby improving the heat abuse rate and the puncture passing rate of the battery cell and reducing the deformation degree of the battery cell.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a cross-sectional view of a separator of the present invention;
FIG. 2 is a schematic diagram of a winding structure of a lithium ion battery according to the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "provided," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
as shown in fig. 1-2, a battery separator, characterized in that: the insulation film comprises an insulation film base layer 2, a first mixed coating layer 1 and a ceramic layer 3, wherein the first mixed coating layer 1 and the ceramic layer 3 are arranged on two sides of the insulation film base layer 2; and a second mixed coating layer 4 is arranged outside the ceramic layer 3.
In an embodiment of the present invention, the thickness of the isolation film base layer 2 is any one of 5um, 7um, 9um, 12um and 16 um. The base material can be made from the aspects of cost and performance, and can be made from materials such as Chongqing Newmi, Cangzhou Mingzhu, Suzhou Jieli, Shanghai Enjie, Xinyuan, and imported, such as Asahi formation, Korean SK, Korean w-scope, and Celgard.
In an embodiment of the present invention, the thickness of the isolation film base layer 2 is 7 um.
In one embodiment of the present invention, the areal density of the first hybrid coating layer 1 is 1.8-2.2g/m 2.
In an embodiment of the present invention, the areal density of the ceramic layer 3 is 2.0-2.4g/m 2.
In one embodiment of the present invention, the areal density of the second hybrid coating layer 4 is 1.6-2.0g/m 2.
A lithium ion battery comprises a positive electrode, a negative electrode and an isolating membrane arranged between the positive electrode and the negative electrode, wherein the isolating membrane is the isolating membrane in any one of the embodiments; and the winding core after the isolation film, the anode and the cathode are wound is arranged in the aluminum-plastic film shell.
The cost of each layer used in the invention is relatively low, and the production cost of the isolating membrane can be effectively reduced; through the reasonable setting of each structural layer outside the base layer, the passing rate of heat abuse and puncture of the electric core and the hardness of the electric core are effectively improved. The first mixed coating layer 1 and the second mixed coating layer 4 are mixed layers, characteristics of two materials are considered, the ceramic has excellent high temperature resistance, heat-resistant shrinkage performance and puncture strength, and safety performance of the battery is improved. The PVDF (polyvinylidene fluoride) glue has excellent chemical corrosion resistance, high-temperature color change resistance, oxidation resistance, wear resistance, flexibility and high expansion strength and impact strength. The mixed layer can give consideration to the thermal contraction capability and the puncture resistance of the diaphragm and the adhesive force of the diaphragm to the positive and negative pole pieces of the battery cell, thereby improving the heat abuse rate and the puncture passing rate of the battery cell and the hardness of the battery cell. By reducing the area density of the second mixed coating layer to reduce the thickness of the coating layer, the total thickness of the separator can be reduced to improve the energy density of the cell.
The arrangement of the ceramic layer 3 can effectively improve the thermal contraction capability and the puncture resistance of the diaphragm, thereby improving the heat abuse rate and the puncture passing rate of the battery cell and reducing the deformation degree of the battery cell.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A battery separator film characterized in that: the insulation film comprises an insulation film base layer (2), and a first mixed coating layer (1) and a ceramic layer (3) which are arranged on two sides of the insulation film base layer (2); a second mixed coating layer (4) is arranged outside the ceramic layer (3); the second mixed coating layer (4) has a lower areal density than the first mixed coating layer (1).
2. The battery separator according to claim 1, wherein: the thickness of barrier film basic unit (2) is any one of 5um, 7um, 9um, 12um, 16 um.
3. The battery separator according to claim 2, wherein: the thickness of barrier film basic unit (2) is 7 um.
4. The battery separator according to claim 1, wherein: the first mixed coating layer (1) and the second mixed coating layer (4) are the same in component and are prepared by mixing ceramic and PVDF (polyvinylidene fluoride) glue; the mass ratio of the ceramic is 50-70%.
5. The battery separator according to claim 4, wherein: the ceramic is alumina ceramic.
6. The battery separator according to claim 1, wherein: the surface density of the first mixed coating layer (1) is 1.8-2.2g/m2。
7. The battery separator according to claim 1, wherein: the surface density of the ceramic layer (3) is 2.0-2.4g/m2。
8. The battery separator according to claim 1, wherein: the surface density of the second mixed coating layer (4) is 1.6-2.0g/m2。
9. The utility model provides a lithium ion battery, includes anodal, negative pole and sets up the barrier film between anodal and negative pole, its characterized in that: the separator is the separator according to any one of claims 1 to 8; and the winding core after the isolation film, the anode and the cathode are wound is arranged in the aluminum-plastic film shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011441464.8A CN112490588A (en) | 2020-12-11 | 2020-12-11 | Battery isolating membrane and lithium ion battery containing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011441464.8A CN112490588A (en) | 2020-12-11 | 2020-12-11 | Battery isolating membrane and lithium ion battery containing same |
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| Publication Number | Publication Date |
|---|---|
| CN112490588A true CN112490588A (en) | 2021-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011441464.8A Pending CN112490588A (en) | 2020-12-11 | 2020-12-11 | Battery isolating membrane and lithium ion battery containing same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022250255A1 (en) * | 2021-05-27 | 2022-12-01 | 더블유스코프코리아 주식회사 | Separator and electrochemical device comprising same |
-
2020
- 2020-12-11 CN CN202011441464.8A patent/CN112490588A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022250255A1 (en) * | 2021-05-27 | 2022-12-01 | 더블유스코프코리아 주식회사 | Separator and electrochemical device comprising same |
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