CN207993511U - film with conducting function - Google Patents
film with conducting function Download PDFInfo
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- CN207993511U CN207993511U CN201721526313.6U CN201721526313U CN207993511U CN 207993511 U CN207993511 U CN 207993511U CN 201721526313 U CN201721526313 U CN 201721526313U CN 207993511 U CN207993511 U CN 207993511U
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- film
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- conductive particles
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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 kind of films with conducting function, film matrix including insulation and several electrically conductive particles being distributed on the film matrix, when the temperature of the film matrix is below or equal to predetermined temperature, several electrically conductive particles conduct, when the temperature of the film matrix is higher than the predetermined temperature, the film matrix expands so that several electrically conductive particles separate and mutually insulated, film has invertibity and repeatable usability, is suitable for cell safety field.A kind of film with conducting function provided by the utility model, it is used as film matrix using with good thermal expansivity material, the electric conductivity of film disappears when temperature exceeds a predetermined temperature, when temperature is less than predetermined temperature, the electric conductivity of film is restored, film has invertibity and repeatable usability, is suitable for cell safety field.
Description
Technical field
The utility model is related to cell safety field more particularly to a kind of films and its preparation side with conducting function
Method.
Background technology
Lithium ion battery is widely used in electronic product, after decades of development, the energy density of lithium ion,
Power density and cycle life are all greatly improved, but the security performance of battery is still an an open question,
Therefore the safety problem of battery hinders the development of lithium ion battery.
It, usually will be to its current density, voltage and work in order to keep best performance during the battery of lithium ion
It gives and limits as temperature.Due to the chemical characteristic of lithium ion battery, during use, if there is overcharge, short circuit etc. other ask
Topic, may cause a series of exothermic reactions, to cause the rising of internal temperature of battery, pressure rise finally to cause battery
The safety problems such as explosion, on fire.
Lithium ion battery is to avoid above-mentioned phenomenon at present, pressure limit switch can be installed in battery top, when inner pressure of battery is more than
The auto-cutout of switch energy, also has using PTC resistor, when battery is because overcharging heating, increases battery when rated value
Internal resistance, to which limitation overcharges electric current, but in the inside of battery, the rising of pressure and the raising of temperature are often more than outside batteries
Drastically, therefore these external equipments can not detect the safety problem of battery in time.
There are mainly three types of the existing schemes from the internal safety problem for solving lithium ion battery：Develop novel isolation material
Material uses electrolysis additive and use thermosensitive type collector.Wherein isolated material mainly by cutting off when the temperature rises
Battery operating conditions improve the heat resistance of battery to realize the protection to battery, for example use double-deck or three layers isolation
Film, such as bilayer PP/PE, the double-deck PP/PP, three layers of PP/PE/PP also have using single layer and add ceramic coated as isolated material, than
Such as PP+ ceramic coateds, PE+ ceramic coateds.No matter which kind of isolated material is used, upon activation of protection mechanism, process is not
Reversible, although battery can be blocked to work in time, battery can not be continuing with.Common electrolysis additive has fire-retardant
Additive and additives for overcharge protection additive, the use of additive need to improve the stabilization of their operating voltage range and cycle
Property.Although can be to avoid addition volatile solvent, the ion of this electrolyte using nonflammable or solid electrolyte
Conductivity is very low, therefore the performance of battery can be declined.Thermosensitive resistance type collector have the characteristics that it is simple, portable, still
Since conductivity is low at room temperature and has sizable leakage current for it, can not popularize always.
Utility model content
In view of the shortcomings of the prior art, the utility model, which provides one kind, changing electric conductivity with temperature change
The film of energy.
In order to achieve the above purpose, the utility model uses the following technical solution：
A kind of film with conducting function, including the film matrix of insulation and be distributed in it is several on the film matrix
Electrically conductive particles, when the temperature of the film matrix is less than or equal to predetermined temperature, several electrically conductive particles conduct,
When the temperature of the film matrix is higher than the predetermined temperature, the film matrix expands so that several electrically conductive particles point
It opens and mutually insulated.
Preferably, the electrically conductive particles include thorn-like matrix and are coated on the conductive layer of the thorn-like outer surface of matrix.
Preferably, the making material of the conductive layer is graphene.
Preferably, the thorn-like matrix is the conductive metal particle of thorn-like.
Preferably, the thorn-like matrix is nanometer thorn-like nickel powder particle.
Preferably, the film matrix is thin polymer film.
Preferably, the film matrix is polyethylene film matrix or epoxy resin thin film matrix.
Preferably, the average particle size range of the electrically conductive particles is 0.5 μm~10 μm.
A kind of film with conducting function provided by the utility model is thin using being used as with good thermal expansivity material
Film matrix, when temperature exceeds a predetermined temperature the electric conductivity disappearance of film, the electric conductivity of film when temperature is less than predetermined temperature
Restore, film has invertibity and repeatable usability, is suitable for cell safety field.It is disclosed by the utility model that there is conduction
The preparation method of the film of function, preparation process is simple, and cost is relatively low, and the selectivity of material is larger, can be according to work temperature
The different film base materials of the different selection thermal expansivities of degree, preferably to control conducting or insulating for electrically conductive particles.
Description of the drawings
Fig. 1 is film schematic diagram when being less than predetermined temperature of the utility model embodiment.
Fig. 2 is film schematic diagram when being higher than predetermined temperature of the utility model embodiment.
Fig. 3 is film profile figure when being less than predetermined temperature of the utility model embodiment.
Fig. 4 is film profile figure when being higher than predetermined temperature of the utility model embodiment.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
The utility model is further described in example.It should be appreciated that specific embodiment described herein is only used to explain this reality
With novel, it is not used to limit the utility model.
As depicted in figs. 1 and 2, the film with conducting function that the utility model embodiment provides includes the film of insulation
Matrix 10 is distributed evenly in several electrically conductive particles 20 on film matrix 10, and film matrix 10 is using with good thermal expansivity
Material be made, when the temperature of film matrix 10 be less than or equal to predetermined temperature when, several electrically conductive particles 20 conduct, when
When the temperature of film matrix 10 is higher than predetermined temperature, film matrix 10 expands so that several electrically conductive particles 20 are separately and mutually exhausted
Edge.Film can change its electric conductivity with the variation of temperature in this way, which can be used for cell safety field, and film is set
It is placed between the electrode of battery and electrolyte, when the temperature of battery is increased to scheduled safe temperature, film matrix 10 expands
So that film is non-conductive to ensure safety to disconnect battery path, when the temperature of battery falls below scheduled safe temperature,
Film matrix 10 is shunk so that electrically conductive particles 20 conduct, to restore battery path, therefore the repeatable utilization of film.
As a preferred embodiment, as shown in Figure 1, electrically conductive particles 20 include thorn-like matrix 21 and are coated on outside thorn-like matrix 21
The conductive layer 22 on surface, wherein thorn-like matrix 21 can be made of conductive metal material, can be also made of insulating materials, thorn-like base
Body 21 is for providing relatively stable bayonet fittings.In the present embodiment, on the one hand conducting between electrically conductive particles 20 can lead to
It crosses and contacts with each other to realize, one side bayonet fittings realize quantum tunneling effect, to realize electronics between electrically conductive particles 20
Circulation.21 outer surface of thorn-like matrix of the present embodiment is entirely bayonet fittings, in this way when the distance between each electrically conductive particles 20
Reach certain and can be conducted by quantum tunneling effect to realize when requiring, each electrically conductive particles 20 is not required to completely attach to.
When film matrix 10 expands, the distance between electrically conductive particles 20 increase, and quantum tunneling effect disappearance causes film-insulated.
Further, above-mentioned conductive layer 22 is just conductive good and is made with stronger antioxidative material,
The present embodiment preferably uses grapheme material, and chemical vapour deposition technique or graphite oxide reduction method can be used by grapheme material
It is coated on the outer surface of thorn-like matrix 21.One side graphene has excellent electric conductivity, it is prone to quantum tunneling effect, separately
One side graphene has good inoxidizability, it is ensured that the stability of thorn-like matrix 21.
Certainly in other embodiments, electrically conductive particles 20 are directly using the particle with thorn-like appearance, without wrapping
Conductive material is covered, such as a nanometer thorn-like nickel powder particle can be used, is evenly arranged in film matrix 10, it also can throughput
Sub- tunneling effect conducts to realize.
In other embodiments, the smooth particle in outside also can be used in electrically conductive particles 20, is realized by contacting with each other
Conduct, such as the electrically conductive particles of sphere or spheroid can be used, when film matrix 10 expands, electrically conductive particles interval to
Realize insulation.
Further, in order to which conducting between electrically conductive particles 20 or mutually insulated is better achieved, film is being made
When, it uses average grain diameter for 0.5 μm -10 μm of electrically conductive particles 20, on the one hand can guarantee that electrically conductive particles 20 have good quantum
On the other hand tunneling effect is easy to generate interval between certifiable electrically conductive particles 20.
As a preferred embodiment, as shown in Figure 3 and Figure 4, the thickness of film matrix 10 is 50 μm, the inside of film matrix 10
Be evenly arranged with a large amount of electrically conductive particles 20 on two opposite sides, and it is conductive micro- not higher than predetermined temperature
Grain 20 is mutual conduction.When film is used cooperatively with battery, the two opposite side surfaces of film matrix 10 are connected to battery respectively
Anode and electrolyte, when cell malfunctions cause temperature rise, film matrix 10 expands so that each electrically conductive particles 20
Spacing increase so that it is film-insulated, to disconnect anode and electrolyte between energization.
Certainly in other embodiments, electrically conductive particles 20 can need not be arranged in the inside of film matrix 10, it is only necessary to thin
10 outer surface of film matrix is uniformly distributed the electrically conductive particles 20 mutually conducted, when film matrix 10 expands, also may make each
The spacing of electrically conductive particles 20 increases, to realize the insulation of film.
Further, in this embodiment film matrix 10 preferably using with good thermal expansivity polymeric matrix,
Such as base polyethylene or epoxy resin thin film matrix can be used in thin polymer film.Certainly, it also can be used in film matrix 10
He has the insulating materials of good thermal expansivity, such as polyamide polymer and polyimide-type materials.
A kind of film with conducting function provided by the utility model is thin using being used as with good thermal expansivity material
Film matrix, when temperature exceeds a predetermined temperature the electric conductivity disappearance of film, the electric conductivity of film when temperature is less than predetermined temperature
Restore, film has invertibity and repeatable usability, is suitable for cell safety field.
The utility model additionally provides a kind of preparation method of the film with conducting function, specifically includes following step
Suddenly：
Step 1：Make electrically conductive particles 20.
Specifically, as a preferred embodiment, electrically conductive particles 20 include thorn-like matrix 21 and are coated on 21 appearance of thorn-like matrix
The conductive layer 22 in face, wherein thorn-like matrix 21 use nanometer thorn-like nickel powder particle, conductive layer 22 to use graphene, be provided below one
The production method of kind electrically conductive particles 20, specifically comprises the following steps：
(S1) by triethylene glycol, 50% sodium hydroxide solution and nickel powder uniformly mix in proportion, in protective gas atmosphere,
Mixed solution is heated, it is made to react the predetermined time；(S2) above-mentioned mixed solution is separated by solid-liquid separation and is precipitated；
(S3) the high temperature anneal is carried out to above-mentioned precipitation in vacuum environment and protective gas atmosphere and obtains product, which is conductive micro-
Grain 20.
Specifically, in step (S1), the amount of triethylene glycol is 100~200ml, and the amount of 50% sodium hydroxide solution is
The quality of 0.1~1ml, nickel powder are 1~10g, as a preferred embodiment, by 100ml triethylene glycols, the hydroxide of 0.1ml 50%
Sodium solution and 1g nickel powders are mixed to join in three-necked flask, and are heated to three-necked flask, and heating temperature is 170 DEG C~200
℃.Solution is stirred using mechanical agitation paddle in heating process, while being passed through nitrogen as protection gas, the reaction time is preferred
It is 10 hours.
Further, in step (S2), above-mentioned mixed solution be separated by solid-liquid separation by the way of centrifugation and is sunk
It forms sediment, the rotating speed of wherein centrifuge is set as 2000~3000r/min, and centrifugation time is set as 3~5min.By obtained precipitation profit
It is cleaned repeatedly with alcohol, removes impurity, vacuum drying treatment then is carried out to precipitation, processing time is 2 to 3 hours.On
Precipitation is stated to include nanometer thorn-like nickel powder particle and be coated on a nanometer graphite linings for thorn-like nickel powder microparticle outer surface.
Further, in step (S3), when carrying out the high temperature anneal under vacuum conditions to precipitating, temperature setting is
500 DEG C~600 DEG C, processing time is 2 to 3 hours, and argon nitrogen is passed through during handling as protection gas, at step (S3)
It is electrically conductive particles 20 to manage obtained product.
Step 2：Electrically conductive particles 20 and 10 powder of film matrix are uniformly mixed and make mixture solution.
As a preferred embodiment, the material of film matrix 10 is selected as polythene material, and electrically conductive particles 20 are pressed with polyethylene
Predetermined ratio uniformly mixes, and the proportional region of the two is 1 here:10~1:2, if the two ratio is too big, i.e., in film matrix 10
Electrically conductive particles 20 quantity it is very little, the spacing between electrically conductive particles 20 is too big, then being not susceptible between electrically conductive particles 20
Quantum tunneling effect, then film is with regard to non-conductive.If the ratio of the two is too small, i.e., electrically conductive particles 20 in film matrix 10
Quantity is too many, then electrically conductive particles 20 are excessively intensive, when film matrix 10 thermally expands, is still sent out between electrically conductive particles 20
Raw quantum tunneling effect and film cannot insulate.
Step 3：Above-mentioned mixture solution is coated in make on substrate and forms film.
Specifically, as a preferred embodiment, film is obtained by drying process after mixture solution being coated on substrate,
The thickness and area of the film can be selected as needed, then film adhered on the electrode of battery by what is prepared.
Certainly in other embodiments, above-mentioned mixture solution directly can be coated in battery just during manufacturing battery
On extremely, film is formed after processing is dried.
The preparation method of film disclosed by the utility model with conducting function, preparation process is simple, and cost is relatively low,
And the selectivity of material is larger, it can be according to the different film base material of the different selection thermal expansivities of operating temperature, with more preferable
Ground control electrically conductive particles are conducted or are insulated.
The above is only the specific implementation mode of the application, it is noted that for the ordinary skill people of the art
For member, under the premise of not departing from the application principle, several improvements and modifications can also be made, these improvements and modifications are also answered
It is considered as the protection domain of the application.
Claims (8)
1. a kind of film with conducting function, which is characterized in that film matrix (10) including insulation and be distributed in described thin
Several electrically conductive particles (20) on film matrix (10), when the temperature of the film matrix (10) is less than or equal to predetermined temperature,
Several electrically conductive particles (20) conduct, when the temperature of the film matrix (10) is higher than the predetermined temperature, institute
Film matrix (10) is stated to expand so that several electrically conductive particles (20) separate and mutually insulated.
2. the film according to claim 1 with conducting function, which is characterized in that the electrically conductive particles (20) include thorn
Shape matrix (21) and the conductive layer (22) for being coated on thorn-like matrix (21) outer surface.
3. the film according to claim 2 with conducting function, which is characterized in that the making material of the conductive layer (22)
Material is graphene.
4. the film according to claim 2 with conducting function, which is characterized in that the thorn-like matrix (21) is thorn-like
Conductive metal particle.
5. the film according to claim 4 with conducting function, which is characterized in that the thorn-like matrix (21) is nanometer
Thorn-like nickel powder particle.
6. the film according to claim 1 with conducting function, which is characterized in that the film matrix (10) is polymerization
Object film.
7. the film according to claim 6 with conducting function, which is characterized in that the film matrix (10) is poly- second
Alkene film matrix or epoxy resin thin film matrix.
8. the film according to claim 1 with conducting function, which is characterized in that electrically conductive particles (20) are averaged
Particle size range is 0.5 μm~10 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721526313.6U CN207993511U (en) | 2017-11-15 | 2017-11-15 | film with conducting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721526313.6U CN207993511U (en) | 2017-11-15 | 2017-11-15 | film with conducting function |
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| Publication Number | Publication Date |
|---|---|
| CN207993511U true CN207993511U (en) | 2018-10-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721526313.6U Active CN207993511U (en) | 2017-11-15 | 2017-11-15 | film with conducting function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107767993A (en) * | 2017-11-15 | 2018-03-06 | 深圳先进技术研究院 | Film with conducting function and preparation method thereof |
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2017
- 2017-11-15 CN CN201721526313.6U patent/CN207993511U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107767993A (en) * | 2017-11-15 | 2018-03-06 | 深圳先进技术研究院 | Film with conducting function and preparation method thereof |
| CN107767993B (en) * | 2017-11-15 | 2024-07-16 | 深圳先进技术研究院 | Film with conductive function and preparation method thereof |
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