CN206313005U - Battery diaphragm and battery - Google Patents
Battery diaphragm and battery Download PDFInfo
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- CN206313005U CN206313005U CN201621424877.4U CN201621424877U CN206313005U CN 206313005 U CN206313005 U CN 206313005U CN 201621424877 U CN201621424877 U CN 201621424877U CN 206313005 U CN206313005 U CN 206313005U
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- battery
- thermoplastic resin
- layer
- ptc material
- material layer
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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
A kind of battery diaphragm, including thermoplastic resin layer and PTC material layer.The thermoplastic resin layer is attached and is arranged at the PTC material layer, and the thermoplastic resin layer is polyethylene layer or polypropylene layer, and the thickness of the thermoplastic resin layer is 3 μm~35 μm, and the thickness of the PTC material layer is 1 μm~10 μm.Above-mentioned battery diaphragm, by in the outside of thermoplastic resin layer, the PTC material layer is set, when the battery diaphragm is applied into battery, the security of lithium ion battery can be improved, when the PTC material layer is with the thermoplastic resin layer compound use, can be when battery-heating reaches 90 DEG C~100 DEG C, so that the internal resistance of the battery diaphragm is drastically increased to 104~105 times of normal temperature, under internal resistance higher, the electric current of inside battery is cut off, the further heat production of battery is prevented from, so as to improve the security performance of battery.
Description
Technical field
The utility model is related to cell art, more particularly to a kind of battery diaphragm and battery.
Background technology
Lithium ion battery is widely used in mobile phone, panel computer, notebook computer, wearable device, portable power source, intelligence
Household, navigator, Baffle Box of Bluetooth, smart card, unmanned plane, electronic cigarette, VR, balance car, wheelbarrow, robot, electric tool, electricity
The fields such as dynamic bicycle, electric automobile, energy-accumulating power station.With the development of science and technology, requirement of the people to lithium ion battery
More and more higher is more long if desired for possessing energy density higher, the cycle life of long period, quickly-chargeable, cruising time
Deng.Client to the performance requirement more and more higher of lithium ion battery, improve battery performance as a kind of urgent and universal requirement.
Common lithium battery includes positive electrode, negative material, electrolyte, barrier film and battery case packaging material.And
In the structure of lithium battery, used as one of crucial interior layer assembly, the performance of barrier film determines the interfacial structure of battery, interior to barrier film
Resistance etc., directly affects capacity, circulation and the characteristic such as security performance of battery, and the barrier film of excellent performance is to improving the synthesis of battery
Performance has important effect.
The polymer Li-ion battery commonly used at present, when energy density more and more higher, battery capacity are increasing,
Security performance turns into more distinct issues.
The barrier film that existing lithium battery is used, refers to Fig. 1, and barrier film 20 is generally only one layer of thermoplastic resin layer 21, institute
Thermoplastic resin layer is stated for polyethylene layer or polypropylene layer.The barrier film that existing lithium battery is used, the polyethylene layer or described
Polypropylene layer cannot block electric current when battery last generates heat to higher temperature, and barrier film cannot suppress battery last heating so that
Lithium ion battery may face the problem of blast or cell damage, and security is relatively low.
Utility model content
Based on this, it is necessary to provide a kind of security preferably and the battery diaphragm and electricity of battery last heating can be suppressed
Pond.
A kind of battery diaphragm, including thermoplastic resin layer and PTC material layer, the thermoplastic resin layer are attached
The PTC material layer is arranged at, the thermoplastic resin layer is polyethylene layer or polypropylene layer, the thermoplastic resin
The thickness of lipid layer is 3 μm~35 μm, and the thickness of the PTC material layer is 1 μm~10 μm.
Wherein in one embodiment, the ratio of PTC material layer and the thickness of the thermoplastic resin layer
It is 1：(2.2~4.2).
Wherein in one embodiment, the ratio of PTC material layer and the thickness of the thermoplastic resin layer
It is 1：(2.8~3.2).
Wherein in one embodiment, the ratio of PTC material layer and the thickness of the thermoplastic resin layer
It is 1：3.
Wherein in one embodiment, also including gathering inclined fluorine diethyl ene coatings, the poly- inclined fluorine diethyl ene coatings are arranged at
The PTC material layer is away from the side of the thermoplastic resin layer.
Wherein in one embodiment, the thickness of the thermoplastic resin layer is 12 μm.
Wherein in one embodiment, the thickness of the PTC material layer is 4 μm.
Wherein in one embodiment, the porosity of the barrier film is 40%-45%.
A kind of battery, it includes positive pole, negative pole, electrolyte and barrier film, and the barrier film is as above described in any embodiment
Battery diaphragm.
Wherein in one embodiment, the battery is soft bag lithium ionic cell.
Above-mentioned battery diaphragm, the PTC material layer is set by the outside of thermoplastic resin layer, will be described
When battery diaphragm is applied to battery, it is possible to increase the security of lithium ion battery, PTC material layer and the heat
During plastic resin layers compound use, can be when battery-heating reaches 90 DEG C~100 DEG C so that the internal resistance urgency of the battery diaphragm
Play is increased to the 10 of normal temperature4~105Times, under internal resistance higher, the electric current of inside battery is cut off, and is prevented from battery and enters one
Step heat production, so as to improve the security performance of battery.It is 3 μm~35 μm by by the thickness of the thermoplastic resin layer, it is described
The thickness of PTC material layer is 1 μm~10 μm, the further heat production of battery is prevented from, so as to improve the safety of battery
Performance.
Brief description of the drawings
Fig. 1 is the structural representation of conventional batteries barrier film；
Fig. 2 is the structural representation of the battery diaphragm of the implementation method of the utility model one.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and implementation
Example, is further elaborated to the utility model.It should be appreciated that specific embodiment described herein is only used to explain
The utility model, is not used to limit the utility model.
For example, a kind of battery diaphragm, including thermoplastic resin layer and PTC material layer, the thermoplastic resin layer
Attaching is arranged at the PTC material layer, and the thermoplastic resin layer is polyethylene layer or polypropylene layer, the thermoplastic
Property resin bed thickness be 3 μm~35 μm, the thickness of PTC material layer is 1 μm~10 μm.
In order to further illustrate above-mentioned battery diaphragm, another example is to refer to Fig. 2, and battery diaphragm 10 includes thermoplastic
Property resin bed 200 and PTC material layer 100, the thermoplastic resin layer attaches and is arranged at the PTC material
Layer, the thermoplastic resin layer is polyethylene layer or polypropylene layer, and the thickness of the thermoplastic resin layer is 3 μm~35 μm, institute
The thickness for stating PTC material layer is 1 μm~10 μm.By in the outside of thermoplastic resin layer, the positive temperature system is set
Number material layer, it is possible to increase the battery diaphragm is applied to security during battery, the PTC material layer and institute
When stating thermoplastic resin layer compound use, can be when battery-heating reaches 90 DEG C~100 DEG C so that the battery diaphragm it is interior
Resistance is drastically increased to the 10 of normal temperature4~105Times, under internal resistance higher, the electric current of inside battery is cut off, and is prevented from battery
Further heat production, so as to improve the security performance of battery.
It should be noted that the material that the resistance value that positive temperature coefficient (PTC) refers to material can rise and rise with temperature.
It is understood that internal resistance influence of the thickness of battery diaphragm on battery is larger, and when normally using, larger internal resistance, meeting
Have influence on the charge and discharge process of lithium ion battery so that the discharge and recharge time is more long, and internal resistance is smaller, easily cause lithium ion battery
Inner heat is too fast, and potential safety hazard is higher so that security is poor.In one embodiment, PTC material layer and institute
The ratio for stating the thickness of thermoplastic resin layer is 1：(2.2~4.2), in such manner, it is possible to ensure that the normal of the battery diaphragm is used,
Make it at a temperature of 5 degrees Celsius~60 degrees Celsius, lithium ion battery being capable of normally discharge and recharge.And working as temperature, to reach 90 Celsius
When spending~100 degrees Celsius, the internal resistance of the battery diaphragm is enabled to drastically to be increased to the 10 of normal temperature4~105Times, higher
Under internal resistance, the electric current of inside battery is cut off, and the further heat production of battery is prevented from, so as to improve the security performance of battery.
And for example, the PTC material layer and the ratio of the thickness of the thermoplastic resin layer are 1：(2.8~3.2), so, energy
Enough security performances for further improving battery, make it at a temperature of 5 degrees Celsius~60 degrees Celsius, and lithium ion battery can be normal
Discharge and recharge etc..
In one embodiment, the PTC material layer and the ratio of the thickness of the thermoplastic resin layer are 1：3, this
Sample, can further improve the security performance of battery, make it at a temperature of 5 degrees Celsius~60 degrees Celsius, lithium ion battery energy
Enough normal discharge and recharges etc..
In the present embodiment, the thickness of the thermoplastic resin layer is 3 μm~35 μm, and for example, the PTC material
Layer thickness be 1 μm~10 μm, in such manner, it is possible to further when battery-heating reaches 90 DEG C~100 DEG C so that the battery every
The internal resistance of film is drastically increased to the 10 of normal temperature4~105Times, under internal resistance higher, the electric current of inside battery is cut off, Neng Goufang
The only further heat production of battery, so as to improve the security performance of battery.And for example, the thickness of the PTC material layer is 4 μ
M, the thickness of the thermoplastic resin layer is 12 μm, in such manner, it is possible to be further ensured that the normal of the battery diaphragm is used, makes it
At a temperature of 5 degrees Celsius~60 degrees Celsius, lithium ion battery being capable of normally discharge and recharge.And work as temperature reach 90 degrees Celsius~
At 100 degrees Celsius, the internal resistance of the battery diaphragm is enabled to drastically to be increased to 104~105 times of normal temperature, in internal resistance higher
Under, the electric current of inside battery is cut off, and the further heat production of battery is prevented from, so as to improve the security performance of battery.
In one embodiment, the porosity of the battery diaphragm is 40%-45%, in such manner, it is possible to make the lithium ion battery
Diaphragm application is when lithium ion battery, and gas permeability is preferable, moreover it is possible to improve the capacity of lithium ion battery.And for example, the battery diaphragm
Aperture be 0.01 micron~0.1 micron, so, the puncture ability of lithium ion is suitable, and can reduce in lithium ion battery
Portion generates dendrite and the problem of short circuit occurs, further increases the security of ion battery.And for example, the hole of the battery diaphragm
Footpath is 0.05 micron, can further reduce and generate dendrite and the problem of short circuit occur in inside lithium ion cell, is further carried
The security of ion battery high.
In order to further improve the intensity and puncture resistant ability of battery diaphragm, in an embodiment, the battery diaphragm is also wrapped
Poly- inclined fluorine diethyl ene coatings are included, the poly- inclined fluorine diethyl ene coatings are arranged at the PTC material layer away from the thermoplastic
Property resin bed side on, so, by set it is described gather inclined fluorine diethyl ene coatings, can further improve the machine of battery diaphragm
Tool intensity and tensile strength, moreover it is possible to improve the heat resistance and chemical stability of the battery diaphragm, enable to battery diaphragm
Tensile strength is good, keeps the porosity of battery diaphragm, and the porosity change of battery diaphragm can be made smaller, is punctured by foreign matter
Or when heavy impact or extruding, barrier film is hardly damaged, and can still keep preferable porosity, so as to reduce positive pole material
The risk of material and negative material directly contact, so as to improve the security of lithium ion battery.Especially, taken the photograph 90 in the barrier film
Electric current can be cut off during the temperature of family name degree~100 degree Celsius, additionally it is possible to improve the fire retardancy of battery diaphragm so that lithium-ion electric
The security in pond is preferable.And for example, the poly- inclined fluorine diethyl ene coatings and the thickness ratio of PTC material layer are (0.5
~1.2)：1.
Above-mentioned battery diaphragm, the PTC material layer, Neng Gouti are set by the outside of thermoplastic resin layer
The battery diaphragm is applied to high security during battery, and the PTC material layer is multiple with the thermoplastic resin layer
When conjunction is used, can be when battery-heating reaches 90 DEG C~100 DEG C so that the internal resistance of the battery diaphragm is drastically increased to normal temperature
104~105Times, under internal resistance higher, the electric current of inside battery is cut off, and the further heat production of battery is prevented from, so as to carry
The security performance of battery high.
The present invention also provides a kind of battery including positive pole, negative pole, electrolyte and barrier film, and the barrier film is upper any one institute
The battery diaphragm stated.And for example, the battery is lithium ion battery, and and for example the battery is soft bag lithium ionic cell.
It should be noted that how the positive pole, the negative pole, the electrolyte and the barrier film exist in battery,
And structural relation, composition etc. refer to prior art accordingly, the present invention will not be repeated here.
Above-mentioned battery is set by using above-mentioned battery diaphragm, the battery diaphragm by the outside of thermoplastic resin layer
The PTC material layer, it is possible to increase the battery diaphragm is applied to security during battery, the positive temperature system
When number material layer is with the thermoplastic resin layer compound use, can be when battery-heating reaches 90 DEG C~100 DEG C so that described
The internal resistance of battery diaphragm is drastically increased to the 10 of normal temperature4~105Times, under internal resistance higher, the electric current of inside battery is cut off,
The further heat production of battery is prevented from, so as to improve the security performance of battery.
In order to further illustrate battery diaphragm of the present utility model and battery, introduced with reference to specific embodiment.
Embodiment 1
The side of 12 μm of thermoplastic resin layers (mean molecule quantity 400,000) is combined/fitted 4 μm of PTC material
Layer, forms battery diaphragm.
Comparative example 1
The conventional membrane that thickness is 12 μm is chosen, conventional membrane is the plastic resin layers (mean molecule that individual layer sets 12 μm
Measure 40 ten thousand).
Same lithium ion battery is being respectively applied to the battery diaphragm of embodiment 1 and the battery diaphragm of comparative example 1 just
Pole material, negative material, electrolyte and packaging material, the battery before then respectively obtaining the battery after improving and improving, respectively
Battery for the battery after improvement and before improving carries out capacity, voltage, discharge test, high temperature storage test, loop test, short
Road, overcharge, hot tank, acupuncture, the test such as energy density and circulation ability.Test result is shown in Table 1.
Table 1
As it can be seen from table 1 relative to comparative example 1, battery diaphragm provided by the utility model can not change electricity
The cycle performance of battery is improved on the basis of the membrane thicknesses of pond, by short electrical testing and can be effectively improved different including metal etc.
Thing punctures the security performance of battery when battery, battery receive the destructive testings such as heavy impact, internal short-circuit.
The polymer Li-ion battery commonly used at present, when energy density more and more higher, battery capacity are increasing,
Security performance turns into more distinct issues.The utility model is used as coating by using PTC (PTC material), and poly-
Ethene or polypropylene composite materials, are made high-safety polymer lithium ion battery separator, can reach 90 DEG C~100 in battery-heating
DEG C when internal resistance be drastically increased to the 10 of normal temperature4~105Times, electric current is cut off, further heat production is prevented, improve the security performance of battery.
The utility model is by the design of battery diaphragm and does not change the electrochemical system of battery and improves and reach raising electricity
The purpose of pond performance, with produce effects it is fast, put into small, effect substantially, conversion difficulty is small, risk is small the features such as.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and its description is more specific and detailed,
But therefore can not be interpreted as the limitation to utility model patent scope.It should be pointed out that for the common skill of this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
Protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of battery diaphragm, it is characterised in that including thermoplastic resin layer and PTC material layer, the thermoplastic resin
Lipid layer is attached and is arranged at PTC material layer, and the thermoplastic resin layer is polyethylene layer or polypropylene layer, described
The thickness of thermoplastic resin layer is 3 μm~35 μm, and the thickness of the PTC material layer is 1 μm~10 μm.
2. battery diaphragm according to claim 1, it is characterised in that the PTC material layer and the thermoplasticity
The ratio of the thickness of resin bed is 1：(2.2~4.2).
3. battery diaphragm according to claim 1, it is characterised in that the PTC material layer and the thermoplasticity
The ratio of the thickness of resin bed is 1：(2.8~3.2).
4. battery diaphragm according to claim 1, it is characterised in that the PTC material layer and the thermoplasticity
The ratio of the thickness of resin bed is 1：3.
5. battery diaphragm according to claim 1, it is characterised in that described poly- inclined also including gathering inclined fluorine diethyl ene coatings
Fluorine diethyl ene coatings are arranged at the PTC material layer away from the side of the thermoplastic resin layer.
6. battery diaphragm according to claim 1, it is characterised in that the thickness of the thermoplastic resin layer is 12 μm.
7. battery diaphragm according to claim 1, it is characterised in that the thickness of the PTC material layer is 4 μm.
8. battery diaphragm according to claim 1, it is characterised in that the porosity of the barrier film is 40%-45%.
9. a kind of battery, it includes positive pole, negative pole, electrolyte and barrier film, it is characterised in that the barrier film is such as claim 1
Battery diaphragm any one of~8.
10. battery as claimed in claim 9, it is characterised in that the battery is soft bag lithium ionic cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621424877.4U CN206313005U (en) | 2016-12-22 | 2016-12-22 | Battery diaphragm and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621424877.4U CN206313005U (en) | 2016-12-22 | 2016-12-22 | Battery diaphragm and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206313005U true CN206313005U (en) | 2017-07-07 |
Family
ID=59245916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621424877.4U Expired - Fee Related CN206313005U (en) | 2016-12-22 | 2016-12-22 | Battery diaphragm and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206313005U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109755463A (en) * | 2017-11-08 | 2019-05-14 | 宁德时代新能源科技股份有限公司 | Electrode pole piece, electrochemical device and safety coating |
| CN113725555A (en) * | 2021-09-28 | 2021-11-30 | 星恒电源(滁州)有限公司 | Lithium ion battery diaphragm and preparation method thereof |
-
2016
- 2016-12-22 CN CN201621424877.4U patent/CN206313005U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109755463A (en) * | 2017-11-08 | 2019-05-14 | 宁德时代新能源科技股份有限公司 | Electrode pole piece, electrochemical device and safety coating |
| CN109755463B (en) * | 2017-11-08 | 2020-12-29 | 宁德时代新能源科技股份有限公司 | Electrode pole piece, electrochemical device and safety coating |
| US11289748B2 (en) | 2017-11-08 | 2022-03-29 | Contemporary Amperex Technology Co., Limited | Electrode plate, electrochemical device and safety coating |
| CN113725555A (en) * | 2021-09-28 | 2021-11-30 | 星恒电源(滁州)有限公司 | Lithium ion battery diaphragm and preparation method thereof |
| CN113725555B (en) * | 2021-09-28 | 2023-03-10 | 星恒电源(滁州)有限公司 | Lithium ion battery diaphragm and preparation method thereof |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170707 Termination date: 20191222 |