CN108321343A - Lithium ion battery and its diaphragm - Google Patents
Lithium ion battery and its diaphragm Download PDFInfo
- Publication number
- CN108321343A CN108321343A CN201810153125.6A CN201810153125A CN108321343A CN 108321343 A CN108321343 A CN 108321343A CN 201810153125 A CN201810153125 A CN 201810153125A CN 108321343 A CN108321343 A CN 108321343A
- Authority
- CN
- China
- Prior art keywords
- diaphragm
- lithium ion
- ion battery
- barrier film
- base material
- 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.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Cell Separators (AREA)
Abstract
The present invention relates to field of lithium ion battery, a kind of lithium ion battery and its diaphragm are disclosed.Diaphragm includes barrier film base material, and heat-sensitive material is also mixed in the barrier film base material, and the coefficient of expansion of the heat-sensitive material is more than the coefficient of expansion of the barrier film base material.Be conducive to improve the heat dissipation performance of lithium ion battery using the technical solution.
Description
Technical field
The present invention relates to lithium ion battery manufacturing field more particularly to a kind of lithium ion batteries and its diaphragm.
Background technology
Lithium ion battery is due to high-energy-density, long circulation life and advantages of environment protection, being widely used in portable
The fields such as electronic product, electric vehicle.Safety of the development of portable electronic products of new generation and electric vehicle to lithium ion battery
More stringent requirements are proposed for property and energy density.Diaphragm is one of significant components of lithium ion battery, effect be prevent it is positive and negative
The physical contact of interpolar, and provide ionic conductivity by Electolyte-absorptive.Although diaphragm does not participate in cell reaction directly,
But its structure and property determine performance of battery, including cyclicity, safety, energy and power density etc..
The lithium ion battery separator being commercialized at present mainly uses polyolefin porous membrane, is for example polyethylene (PE), poly- third
Alkene (PP) and their composite diaphragm, although they have good chemical stability and excellent mechanical performance, its
Its application in lithium ion battery of new generation of poor electrolyte compatibility and thermal stability limit.In order to inhibit diaphragm
Deformation at high temperature, is typically employed in the method for coating inorganic oxide in diaphragm substrate to improve the thermal stability of diaphragm,
As used inorganic particulate and organic filler that film polyolefin film is blended in patent CN105449141A, but such diaphragm is in mistake
Under high-temperature, inside battery lithium ion is still allowed for pass through, internal temperature of battery is caused to continue to increase, it is final that burning occurs even
The safety accidents such as explosion.
High-temperature behavior is an important indicator of lithium ion battery, if battery temperature is excessively high to will produce security risk, simultaneously
Also the service life of battery can be influenced.
In addition, since the hot closed pore temperature of polyethylene higher (130 DEG C) can cause diaphragm to close due to the presence of thermal inertia
The temperature of inside battery has substantially exceeded 130 DEG C when hole, so as to cause the side reaction of positive and negative anodes and electrolyte.
The fields such as electric vehicle and energy-storage system are big to the demand of lithium ion battery, and with China's new energy vapour
The gradually development of the new industries such as vehicle and wind-powered electricity generation, photovoltaic generation, the demand to highly secure lithium ion battery is more and more urgent, because
This, development cost is low, good permeability, safe lithium ion battery separator are of great significance.
Invention content
The first purpose of the embodiment of the present invention is to provide a kind of lithium ion battery and its diaphragm, has using the technical solution
Conducive to the heat dissipation performance of raising lithium ion battery.
In a first aspect, a kind of diaphragm suitable for lithium ion battery provided in an embodiment of the present invention comprising barrier film base material,
Heat-sensitive material is also mixed in the barrier film base material, the coefficient of expansion of the heat-sensitive material is more than the barrier film base material
The coefficient of expansion.
Optionally, the heat-sensitive material is：Ceramic powders.
Optionally, the barrier film base material is：Polyolefin porous membrane.
Optionally, the barrier film base material is：Polyethylene, polypropylene or their composite diaphragm.
Second aspect, a kind of lithium ion battery provided in an embodiment of the present invention comprising above-mentioned any diaphragm.
Therefore relative to traditional polyolefin porous membrane, due to being also mixed with expansion system in the present embodiment diaphragm
The higher heat-sensitive material of number, during battery applications, during battery temperature is raised, because of the heat being added in diaphragm
Sensitive material than diaphragm other materials to the susceptibility higher of temperature, can first expand and put in the temperature raised starting stage
Go out heat, it, can be to avoid the further deterioration of battery performance so as to slow down the raising of battery temperature；Simultaneously in barrier film base material
The heat-sensitive material of middle mixing the present embodiment can be caused to avoid because temperature is excessively high, diaphragm retracts rate is excessive diaphragm destruction and
Security risk.
Specific implementation mode
Below in conjunction with specific embodiment, the present invention will be described in detail, herein illustrative examples and explanation of the invention
For explaining the present invention, but it is not as a limitation of the invention.
Embodiment 1：
The present embodiment provides a kind of diaphragms suitable for lithium ion battery, include mainly barrier film base material, in diaphragm base
Heat-sensitive material is also mixed in material, wherein heat-sensitive material is：The coefficient of expansion be more than barrier film base material the coefficient of expansion, and with
The material that electrolyte and pole piece do not chemically react.
The preparation process of its septation can need to be only mixed into according to the prior art in the barrier film base material for being used to prepare diaphragm
There is the heat-sensitive material of the present embodiment, preparation process is with reference to the prior art.
Above-mentioned diaphragm can be applied in lithium ion battery, which can be that winding battery may be folded
Piece battery etc..
Therefore relative to traditional polyolefin porous membrane, due to being also mixed with expansion system in the present embodiment diaphragm
The higher heat-sensitive material of number, during battery applications, during battery temperature is raised, because of the heat being added in diaphragm
Sensitive material than diaphragm other materials to the susceptibility higher of temperature, can first expand and put in the temperature raised starting stage
Go out heat, it, can be to avoid the further deterioration of battery performance so as to slow down the raising of battery temperature；Simultaneously in barrier film base material
The heat-sensitive material of middle mixing the present embodiment can be caused to avoid because temperature is excessively high, diaphragm retracts rate is excessive diaphragm destruction and
Security risk.
It is unrestricted as the signal of the present embodiment, the heat-sensitive material of the present embodiment can be, but not limited to for：Ceramic powder
End, the granularity of the ceramic powders are identical or similar as the granularity of barrier film base material in the prior art.
Unrestricted as the signal of the present embodiment, the barrier film base material of the present embodiment can be polyolefin in the prior art
Perforated membrane can be for example polyethylene (PE), polypropylene (PP) and their composite diaphragm.
Embodiments described above does not constitute the restriction to the technical solution protection domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution made by within the spirit and principle of mode
Within enclosing.
Claims (5)
1. a kind of diaphragm suitable for lithium ion battery, characterized in that including barrier film base material, also mixed in the barrier film base material
There are heat-sensitive material, the coefficient of expansion of the heat-sensitive material to be more than the coefficient of expansion of the barrier film base material.
2. the diaphragm according to claim 1 suitable for lithium ion battery, characterized in that
The heat-sensitive material is：Ceramic powders.
3. the diaphragm according to claim 1 suitable for lithium ion battery, characterized in that
The barrier film base material is：Polyolefin porous membrane.
4. the diaphragm according to claim 3 suitable for lithium ion battery, characterized in that
The barrier film base material is：Polyethylene, polypropylene or their composite diaphragm.
5. a kind of lithium ion battery, characterized in that any diaphragm including Claims 1-4.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710094303 | 2017-02-22 | ||
| CN2017100943038 | 2017-02-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108321343A true CN108321343A (en) | 2018-07-24 |
Family
ID=62899779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810153125.6A Pending CN108321343A (en) | 2017-02-22 | 2018-02-20 | Lithium ion battery and its diaphragm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108321343A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1521321A2 (en) * | 2003-09-30 | 2005-04-06 | Nichias Corporation | Separator for fuel cell and process for producing the same |
| CN102195020A (en) * | 2010-03-04 | 2011-09-21 | 赛尔格有限责任公司 | Method for preventing or reducing sudden thermal runaway of lithium ion battery |
| CN102856521A (en) * | 2012-09-19 | 2013-01-02 | 蚌埠鑫源石英材料有限公司 | Plate-like alpha-alumina coating for lithium battery |
| CN105845871A (en) * | 2016-05-20 | 2016-08-10 | 成都慧成科技有限责任公司 | Lithium battery separator with thermal switch function and preparation method of lithium battery separator |
| US9722259B2 (en) * | 2013-08-21 | 2017-08-01 | Murata Manufacturing Co., Ltd. | Ceramic substrate for electrochemical element, manufacturing method therefore, fuel cell, and fuel cell stack |
-
2018
- 2018-02-20 CN CN201810153125.6A patent/CN108321343A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1521321A2 (en) * | 2003-09-30 | 2005-04-06 | Nichias Corporation | Separator for fuel cell and process for producing the same |
| CN102195020A (en) * | 2010-03-04 | 2011-09-21 | 赛尔格有限责任公司 | Method for preventing or reducing sudden thermal runaway of lithium ion battery |
| CN102856521A (en) * | 2012-09-19 | 2013-01-02 | 蚌埠鑫源石英材料有限公司 | Plate-like alpha-alumina coating for lithium battery |
| US9722259B2 (en) * | 2013-08-21 | 2017-08-01 | Murata Manufacturing Co., Ltd. | Ceramic substrate for electrochemical element, manufacturing method therefore, fuel cell, and fuel cell stack |
| CN105845871A (en) * | 2016-05-20 | 2016-08-10 | 成都慧成科技有限责任公司 | Lithium battery separator with thermal switch function and preparation method of lithium battery separator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180724 |
|
| WD01 | Invention patent application deemed withdrawn after publication |