CN107749319A - A kind of electrically conductive composite and preparation method thereof and protection device and application - Google Patents
A kind of electrically conductive composite and preparation method thereof and protection device and application Download PDFInfo
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- CN107749319A CN107749319A CN201710957273.9A CN201710957273A CN107749319A CN 107749319 A CN107749319 A CN 107749319A CN 201710957273 A CN201710957273 A CN 201710957273A CN 107749319 A CN107749319 A CN 107749319A
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- electrically conductive
- conductive composite
- protection device
- lithium battery
- base material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/581—Devices or arrangements for the interruption of current in response to temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/10—Temperature sensitive devices
- H01M2200/106—PTC
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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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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Dispersion Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a kind of electrically conductive composite and preparation method thereof and protection device and application; electrically conductive composite of the present invention is mainly prepared by the conductive filler and base material of specific average grain diameter with specific usage ratio; described electrically conductive composite has resistance positive temperature degree effect; it can effectively prevent lithium battery from excessively stream and the situation of excess temperature occur, fully improve the security and service life of lithium battery.The preparation method technique of electrically conductive composite of the present invention is simple, suitable for large-scale production.Protection device of the present invention is used as electrically conductive composite layer using electrically conductive composite of the present invention; it is simple in construction; small volume; it is in light weight; it reliable operation, can be assembled integrally with lithium battery, can act as li-ion cell protection device; effectively prevent lithium battery from excessively stream and the situation of excess temperature occur, fully improve the security and service life of lithium battery.
Description
Technical field
The present invention relates to technical field of lithium batteries, in particular to a kind of electrically conductive composite and preparation method thereof and guarantor
Protection unit and application.
Background technology
In the present age, lithium battery is widely used in life, and the security performance of lithium battery receives much concern.When lithium battery is met
When circuit excessively stream or battery overheat, if the connection of battery and external circuit can be cut off in time, inside battery can be protected not by outer
The influence of portion's circuit, play a part of protecting battery, improve the service life and security performance of battery.
In correlation technique, in order to protect battery pack not by caused overcurrent and excess temperature etc. during repeated charge
Influence, and connect battery using circuit brake.But this body structure of interlock circuit protection device is more complicated, volume and
Weight is larger, can only be arranged on lithium battery external, then is attached with lithium battery, adds additional the volume and again of lithium battery
Amount, limits the further practical application of lithium battery.
In view of this, it is special to propose the present invention.
The content of the invention
The first object of the present invention is to provide a kind of electrically conductive composite, and described electrically conductive composite has resistance positive temperature degree
It effect, can effectively prevent lithium battery from excessively stream and the situation of excess temperature occur, fully improve the security and service life of lithium battery.
The second object of the present invention is to provide a kind of preparation method of described electrically conductive composite, the letter of this method technique
It is single, suitable for large-scale production.
The third object of the present invention is to provide a kind of protection device containing described electrically conductive composite, described protection
Device is using described electrically conductive composite as electrically conductive composite layer, simple in construction, small volume, in light weight, reliable operation, Neng Gouyu
Lithium battery is assembled integrally, and effectively prevents lithium battery from excessively stream and the situation of excess temperature occur, fully improve lithium battery security and
Service life.
The fourth object of the present invention is to provide a kind of application of described protection device, and described protection device can be used
Make li-ion cell protection device, can effectively prevent lithium battery from excessively stream and the situation of excess temperature occur, fully improve the safety of lithium battery
Property and service life.
In order to realize the above-mentioned purpose of the present invention, spy uses following technical scheme：
A kind of electrically conductive composite, the electrically conductive composite are mainly prepared by the composition of volumes below number：
Base material 3-7 parts and conductive filler 3-7 parts；
The average grain diameter of the conductive filler is 2-50 μm.
Electrically conductive composite of the present invention is mainly prepared by the conductive filler and base material of specific average grain diameter with specific usage ratio
Obtain, described electrically conductive composite has resistance positive temperature degree effect, can effectively prevent lithium battery from excessively stream and the feelings of excess temperature occur
Condition, fully improve the security and service life of lithium battery.
Alternatively, the electrically conductive composite is mainly prepared by the composition of volumes below number：
Base material 4-6 parts and conductive filler 4-6 parts.
Alternatively, the electrically conductive composite is mainly prepared by the composition of volumes below number：
5 parts of 5 parts of base material and conductive filler.
Alternatively, the base material includes the one or more in polymer base material, preferably includes polyethylene, polypropylene, ring
One or more in oxygen tree fat, ethylene-alpha-olefin copolymer.
Alternatively, the conductive filler includes the one or more in carbide, boride, nitride and silicide.
Alternatively, the carbide include tungsten carbide, vanadium carbide, zirconium carbide, titanium carbide and dimolybdenum carbide in one kind or
It is a variety of.
Alternatively, the boride includes the one or more in the tungsten of boronation two, tungsten boride, tantalum boride and niobium (Nb) boride.
Alternatively, the nitride includes one kind or more in tantalum nitride, vanadium nitride, zirconium nitride, titanium nitride and niobium nitride
Kind.
Alternatively, the silicide includes two vanadium silicides, zirconium disilicide, titanium disilicide, niobium disilicide, molybdenum disilicide, two
One or more in hafnium suicide and tungsten silicide.
Alternatively, the average grain diameter of the conductive filler is 2-10 μm, preferably 5 μm.
A kind of preparation method of above-mentioned electrically conductive composite, in proportion by base material and conductive filler be sufficiently mixed uniformly, into
Type, obtain electrically conductive composite.
The preparation method technique of electrically conductive composite of the present invention is simple, suitable for large-scale production.
Alternatively, polymer base material and conductive filler are sufficiently mixed uniformly in proportion, compression molding, obtained conductive compound
Thing.
A kind of protection device, including：Using above-mentioned electrically conductive composite as electrically conductive composite layer, the electrically conductive composite layer
Both sides electrically connected respectively with least one piece of pole piece.
Protection device of the present invention is using electrically conductive composite of the present invention as electrically conductive composite layer, simple in construction, small volume, weight
Gently, reliable operation, can be assembled integrally with lithium battery, effectively prevent lithium battery from excessively stream and the situation of excess temperature occur, fully carry
The security and service life of high lithium battery.
A kind of application of above-mentioned protection device, the protection device are used as li-ion cell protection device.
Protection device of the present invention can act as li-ion cell protection device, effectively can prevent lithium battery from excessively stream and excess temperature occur
Situation, fully improve lithium battery security and service life.
Alternatively, at least one piece of pole piece electrically connected with side in electrically conductive composite layer electrically connects with lithium battery pole ear.
Alternatively, at least one piece of pole piece electrically connected with opposite side in electrically conductive composite layer electrically connects with external circuit.
Alternatively, at least one piece of pole piece electrically connected with side in electrically conductive composite layer passes through the side that is spirally connected and/or rivets
Formula is serially connected with lithium battery pole ear and conductive path is formed in protection circuit.
Compared with prior art, beneficial effects of the present invention are：
Electrically conductive composite of the present invention is mainly prepared by the conductive filler and base material of specific average grain diameter with specific usage ratio
Obtain, described electrically conductive composite has resistance positive temperature degree effect, can effectively prevent lithium battery from excessively stream and the feelings of excess temperature occur
Condition, fully improve the security and service life of lithium battery.The preparation method technique of electrically conductive composite of the present invention is simple, suitable for big
Large-scale production.Protection device of the present invention is using electrically conductive composite of the present invention as electrically conductive composite layer, simple in construction, small volume, weight
Amount is light, reliable operation, can be assembled integrally with lithium battery, can act as li-ion cell protection device, effectively prevent lithium battery from going out
The situation of existing excessively stream and excess temperature, fully improve the security and service life of lithium battery.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the protection device and lithium battery pole ear attachment structure schematic diagram that a kind of embodiment of the present invention provides.
Reference：
1- pole pieces；2- electrically conductive composite layers；3- lithium battery pole ears.
Embodiment
Technical scheme is clearly and completely described below in conjunction with the drawings and specific embodiments, but
Be it will be understood to those of skill in the art that following described embodiment is part of the embodiment of the present invention, it is rather than whole
Embodiment, the present invention is merely to illustrate, and is not construed as limiting the scope of the present invention.Based on the embodiment in the present invention, ability
The every other embodiment that domain those of ordinary skill is obtained under the premise of creative work is not made, belongs to guarantor of the present invention
The scope of shield.Unreceipted actual conditions person in embodiment, the condition suggested according to normal condition or manufacturer are carried out.Agents useful for same
Or the unreceipted production firm person of instrument, it is the conventional products that can be obtained by commercially available purchase.
In the description of the invention, it is necessary to explanation, term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to
Be easy to the description present invention and simplify description, rather than instruction or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" the 3rd " is only used for describing purpose, and it is not intended that instruction or hint relative importance.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
A kind of electrically conductive composite, the electrically conductive composite are mainly prepared by the composition of volumes below number：
Base material 3-7 parts and conductive filler 3-7 parts；
The average grain diameter of the conductive filler is 2-50 μm.
Electrically conductive composite of the present invention is mainly prepared by the conductive filler and base material of specific average grain diameter with specific usage ratio
Obtain, described electrically conductive composite has resistance positive temperature degree effect, can effectively prevent lithium battery from excessively stream and the feelings of excess temperature occur
Condition, fully improve the security and service life of lithium battery.
Electrically conductive composite of the present invention has resistance positive temperature degree effect, has at a temperature of the normal use of lithium battery relatively low
Resistance, the normal work of lithium battery can be ensured, when the temperature of lithium battery is raised to more than a certain temperature (transition temperature), this hair
The resistance of bright electrically conductive composite can significantly improve, and significantly reduce the current strength of lithium battery system, lithium battery is protected, and prevent
Only there is excessively stream and the situation of excess temperature.
In a kind of optional embodiment of the present invention, the electrically conductive composite is mainly by the composition of volumes below number
It is prepared：
Base material 4-6 parts and conductive filler 4-6 parts.
In a kind of optional embodiment of the present invention, the electrically conductive composite is mainly by the composition of volumes below number
It is prepared：
5 parts of 5 parts of base material and conductive filler.
Different base materials and conductive filler usage ratio are selected, can obtain that there is the conductive compound of different transition temperatures
Thing.
In a kind of optional embodiment of the present invention, the base material includes the one or more in polymer base material,
Preferably include the one or more in polyethylene, polypropylene, epoxy resin, ethylene-alpha-olefin copolymer.
In a kind of optional embodiment of the present invention, the conductive filler include carbide, boride, nitride and
One or more in silicide.
In a kind of optional embodiment of the present invention, the carbide includes tungsten carbide, vanadium carbide, zirconium carbide, carbon
Change the one or more in titanium and dimolybdenum carbide.
In a kind of optional embodiment of the present invention, the boride include the tungsten of boronation two, tungsten boride, tantalum boride and
One or more in niobium (Nb) boride.
In a kind of optional embodiment of the present invention, the nitride includes tantalum nitride, vanadium nitride, zirconium nitride, nitrogen
Change the one or more in titanium and niobium nitride.
In a kind of optional embodiment of the present invention, the silicide includes two vanadium silicides, zirconium disilicide, two silication
One or more in titanium, niobium disilicide, molybdenum disilicide, two hafnium suicides and tungsten silicide.
Using different base material and conductive filler, the electrically conductive composite with different transition temperatures can be obtained.
In a kind of optional embodiment of the present invention, the average grain diameter of the conductive filler is 2-10 μm, preferably 5
μm。
By adjusting the average grain diameter of conductive filler, the electrically conductive composite with different transition temperatures can be obtained.
A kind of preparation method of above-mentioned electrically conductive composite, in proportion by base material and conductive filler be sufficiently mixed uniformly, into
Type, obtain electrically conductive composite.
The preparation method technique of electrically conductive composite of the present invention is simple, suitable for large-scale production.
In a kind of optional embodiment of the present invention, in base material and conductive filler mixed process, part can be added
Volatile liquid auxiliary agent (such as water, ethanol etc.), base material and conductive filler is promoted to be sufficiently mixed uniformly, heating removes volatility liquid
Body auxiliary agent, shaping obtain electrically conductive composite.
In a kind of optional embodiment of the present invention, polymer base material and conductive filler are sufficiently mixed in proportion
It is even, compression molding, obtain electrically conductive composite.
, can be first by high score when using two or more polymer base materials in a kind of optional embodiment of the present invention
Subbase material mixing extrusion, obtains polymer base material mixed material, then is sufficiently mixed uniformly with conductive filler, compression molding, obtains
Electrically conductive composite.
In a kind of optional embodiment of the present invention, the mixing of the polymer base material and conductive filler is using melting
Blending method, extrude afterwards, compression molding, obtain electrically conductive composite.
A kind of protection device, including：Using above-mentioned electrically conductive composite as electrically conductive composite layer, the electrically conductive composite layer
Both sides electrically connected respectively with least one piece of pole piece.
Protection device of the present invention is using electrically conductive composite of the present invention as electrically conductive composite layer, simple in construction, small volume, weight
Gently, reliable operation, can be assembled integrally with lithium battery, effectively prevent lithium battery from excessively stream and the situation of excess temperature occur, fully carry
The security and service life of high lithium battery.
Electrically conductive composite of the present invention has special resistance positive temperature degree effect, and this is the property of electrically conductive composite of the present invention in itself
Matter, it is unrelated with its shape, volume, therefore the conduction of volume very little can be prepared into using minimal amount of electrically conductive composite of the present invention
Composite layer, by its resistance positive temperature degree effect, effective excessively stream and overheat protector are carried out to lithium battery.
In a kind of optional embodiment of the present invention, the pole piece includes metal pole piece, such as copper-base piece.
A kind of application of above-mentioned protection device, the protection device are used as li-ion cell protection device.
Protection device of the present invention can act as li-ion cell protection device, effectively can prevent lithium battery from excessively stream and excess temperature occur
Situation, fully improve lithium battery security and service life.
, can be conductive compound with the minimal amount of present invention due to the special resistance positive temperature degree effect of electrically conductive composite of the present invention
Thing is prepared li-ion cell protection device, gained protection device small volume, in light weight, can be directly with lithium battery encapsulation one
Rise, it is not necessary to outer protection circuit is set, the quality and volume of lithium-ion-power cell group can be effectively reduced, promote it wider
General application.
In a kind of optional embodiment of the present invention, at least one piece of pole for being electrically connected with side in electrically conductive composite layer
Piece electrically connects with lithium battery pole ear.
In a kind of optional embodiment of the present invention, electrically connected with opposite side in electrically conductive composite layer at least one piece
Pole piece electrically connects with external circuit.
In a kind of optional embodiment of the present invention, at least one piece of pole for being electrically connected with side in electrically conductive composite layer
Piece is serially connected with lithium battery pole ear by way of being spirally connected and/or riveting and is formed conductive path in protection circuit.
Protection device of the present invention can be as a part for lithium battery pole ear, or its extension, concatenation with circuit, to lithium
Battery carries out effective excessively stream and overheat protector.
Embodiment 1
A kind of preparation of protection device, including：
Selection base material is high density polyethylene (HDPE) (model 17450N, manufacturer are Dow Chemical), and its density is
0.945g/cm3；
It is conductive filler to select dimolybdenum carbide, and its particle diameter is 5 μm；
The volume ratio of base material and conductive filler is 4：6；
By base material and the abundant melt blending of conductive filler (more than 135 DEG C), extrusion, compression molding, electrically conductive composite is obtained；
As shown in figure 1, using above-mentioned electrically conductive composite as the electrically conductive composite layer 2 of protection device, on electrically conductive composite layer 2
Lower both sides contact with 1 piece of pole piece 1 respectively to be connected, and obtains a kind of protection device.
Wherein 1 piece of pole piece 1 of gained protection device is contacted with lithium battery pole ear 3 it is connected, using gained protection device as
Lithium battery excessively stream and overheat protector device.
Embodiment 2
A kind of preparation of protection device, including：
Selection base material is epoxy resin (trade mark 604, manufacturer are occasion insulating materials Co., Ltd of Laizhou City hundred)；
It is conductive filler to select the tungsten of boronation two, and its particle diameter is 2 μm；
The volume ratio of base material and conductive filler is 3：7；
By base material and the abundant melt blending of conductive filler (more than 100 DEG C), extrusion, compression molding, electrically conductive composite is obtained；
As shown in figure 1, using above-mentioned electrically conductive composite as the electrically conductive composite layer 2 of protection device, on electrically conductive composite layer 2
Lower both sides contact with 1 piece of pole piece 1 respectively to be connected, and obtains a kind of protection device.
Wherein 1 piece of pole piece 1 of gained protection device is contacted with lithium battery pole ear 3 it is connected, using gained protection device as
Lithium battery excessively stream and overheat protector device.
Embodiment 3
A kind of preparation of protection device, including：
For polypropylene, (trade mark K8303, manufacturer are Sinopec Group Beijing Yanshan Mountain to selection base material
Branch company)；
It is conductive filler to select tantalum nitride, and its particle diameter is 50；
The volume ratio of base material and conductive filler is 7：3；
By base material and the abundant melt blending of conductive filler (more than 100 DEG C), extrusion, compression molding, electrically conductive composite is obtained；
As shown in figure 1, using above-mentioned electrically conductive composite as the electrically conductive composite layer 2 of protection device, on electrically conductive composite layer 2
Lower both sides contact with 1 piece of pole piece 1 respectively to be connected, and obtains a kind of protection device.
Wherein 1 piece of pole piece 1 of gained protection device is contacted with lithium battery pole ear 3 it is connected, using gained protection device as
Lithium battery excessively stream and overheat protector device.
Embodiment 4
A kind of preparation of protection device, including：
Selection base material is high density polyethylene (HDPE) (model 17450N, manufacturer are Dow Chemical), and its density is
0.945g/cm3；
It is conductive filler to select tungsten silicide, and its particle diameter is 10 μm；
The volume ratio of base material and conductive filler is 6：4；
By base material and the abundant melt blending of conductive filler (more than 135 DEG C), extrusion, compression molding, electrically conductive composite is obtained；
As shown in figure 1, using above-mentioned electrically conductive composite as the electrically conductive composite layer 2 of protection device, on electrically conductive composite layer 2
Lower both sides contact with 1 piece of pole piece 1 respectively to be connected, and obtains a kind of protection device.
Wherein 1 piece of pole piece 1 of gained protection device is contacted with lithium battery pole ear 3 it is connected, using gained protection device as
Lithium battery excessively stream and overheat protector device.
Embodiment 5
A kind of preparation of protection device, including：
Selection base material is epoxy resin (trade mark 604, manufacturer are occasion insulating materials Co., Ltd of Laizhou City hundred)；
It is conductive filler to select tantalum boride, and its particle diameter is 5 μm；
The volume ratio of base material and conductive filler is 5：5；
By base material and the abundant melt blending of conductive filler (more than 100 DEG C), extrusion, compression molding, electrically conductive composite is obtained；
As shown in figure 1, using above-mentioned electrically conductive composite as the electrically conductive composite layer 2 of protection device, on electrically conductive composite layer 2
Lower both sides contact with 1 piece of pole piece 1 respectively to be connected, and obtains a kind of protection device.
Wherein 1 piece of pole piece 1 of gained protection device is contacted with lithium battery pole ear 3 it is connected, using gained protection device as
Lithium battery excessively stream and overheat protector device.
Embodiment 6
A kind of preparation of protection device, including：
Selection base material is high density polyethylene (HDPE) (model 17450N, manufacturer are Dow Chemical), and its density is
0.945g/cm3；
It is conductive filler to select dimolybdenum carbide, and its particle diameter is 5 μm；
The volume ratio of base material and conductive filler is 54：46；
By base material and the abundant melt blending of conductive filler (more than 135 DEG C), extrusion, compression molding, electrically conductive composite is obtained；
As shown in figure 1, using above-mentioned electrically conductive composite as the electrically conductive composite layer 2 of protection device, on electrically conductive composite layer 2
Lower both sides contact with 1 piece of pole piece 1 respectively to be connected, and obtains a kind of protection device.
Wherein 1 piece of pole piece 1 of gained protection device is contacted with lithium battery pole ear 3 it is connected, using gained protection device as
Lithium battery excessively stream and overheat protector device.
Embodiment 7
A kind of preparation of protection device, including：
Selection base material is high density polyethylene (HDPE) (model 17450N, manufacturer are Dow Chemical), and its density is
0.945g/cm3；
It is conductive filler to select dimolybdenum carbide, and its particle diameter is 5 μm；
The volume ratio of base material and conductive filler is 65：35；
By base material and the abundant melt blending of conductive filler (more than 135 DEG C), extrusion, compression molding, electrically conductive composite is obtained；
As shown in figure 1, using above-mentioned electrically conductive composite as the electrically conductive composite layer 2 of protection device, on electrically conductive composite layer 2
Lower both sides contact with 1 piece of pole piece 1 respectively to be connected, and obtains a kind of protection device.
Wherein 1 piece of pole piece 1 of gained protection device is contacted with lithium battery pole ear 3 it is connected, using gained protection device as
Lithium battery excessively stream and overheat protector device.
After protection device obtained by the present invention is connected with lithium ion battery, access in circuit, it is right under conditions of 25 DEG C
Lithium ion battery is respectively in 32A, 36A, 40A, 50A, and discharge test is carried out under 60A electric currents, read on curve obtained by protect dress
The transition temperature value (DEG C) of resistance mutation is put, protection device device current reduction obtained by record to required time during 1C, as a result such as
Shown in Tables 1 and 2：
The protection device transition temperature test result of the present invention of table 1
The protection device current reduction of the present invention of table 2 is to test result the time required to during 1C
By Tables 1 and 2 as can be seen that preparing protection device using electrically conductive composite of the present invention, it is able in lithium electricity
Resistance mutation occurs when reaching different temperatures for pond, and itself resistance significantly improves, and flowing through the electric current of lithium battery significantly reduces,
In the case of excessively stream and excess temperature, the safety in utilization and service life of lithium battery are effectively protected；It is in addition, conductive compound using the present invention
Protection device prepared by thing is simple in construction, and small volume is in light weight, reliable operation, can be assembled integrally with lithium battery, fully
Extend the application prospect of lithium battery.
Although illustrate and describing the present invention with specific embodiment, but it will be appreciated that various embodiments above is only used
To illustrate technical scheme, rather than its limitations；It will be understood by those within the art that：Without departing substantially from this hair
In the case of bright spirit and scope, the technical scheme described in foregoing embodiments can be modified, or to wherein
Some or all of technical characteristic carries out equivalent substitution；And these are changed or are replaced, the essence of appropriate technical solution is not made
Depart from the scope of various embodiments of the present invention technical scheme；It is, therefore, intended that include belonging to the present invention in the following claims
In the range of all these substitutions and modifications.
Claims (10)
1. a kind of electrically conductive composite, it is characterised in that the electrically conductive composite is mainly prepared into by the composition of volumes below number
Arrive：
Base material 3-7 parts and conductive filler 3-7 parts；
The average grain diameter of the conductive filler is 2-50 μm；
Alternatively, the electrically conductive composite is mainly prepared by the composition of volumes below number：
Base material 4-6 parts and conductive filler 4-6 parts；
Alternatively, the electrically conductive composite is mainly prepared by the composition of volumes below number：
5 parts of 5 parts of base material and conductive filler.
2. a kind of electrically conductive composite according to claim 1, it is characterised in that the base material is included in polymer base material
One or more, preferably include the one or more in polyethylene, polypropylene, epoxy resin, ethylene-alpha-olefin copolymer.
3. a kind of electrically conductive composite according to claim 1, it is characterised in that the conductive filler includes carbide, boron
One or more in compound, nitride and silicide；
Alternatively, the carbide includes the one or more in tungsten carbide, vanadium carbide, zirconium carbide, titanium carbide and dimolybdenum carbide；
Alternatively, the boride includes the one or more in the tungsten of boronation two, tungsten boride, tantalum boride and niobium (Nb) boride；
Alternatively, the nitride includes the one or more in tantalum nitride, vanadium nitride, zirconium nitride, titanium nitride and niobium nitride；
Alternatively, the silicide includes two vanadium silicides, zirconium disilicide, titanium disilicide, niobium disilicide, molybdenum disilicide, two silication
One or more in hafnium and tungsten silicide.
4. a kind of electrically conductive composite according to claim 1, it is characterised in that the average grain diameter of the conductive filler is 2-
10 μm, preferably 5 μm.
5. the preparation method of a kind of electrically conductive composite as described in claim 1-4 is any, it is characterised in that in proportion by base material
It is sufficiently mixed uniformly with conductive filler, shaping, obtains electrically conductive composite.
6. the preparation method of a kind of electrically conductive composite according to claim 5, it is characterised in that in proportion will be polymer-based
Material and conductive filler are sufficiently mixed uniformly, compression molding, obtain electrically conductive composite.
A kind of 7. protection device, it is characterised in that including：With the electrically conductive composite described in claim 1-4 any claims
As electrically conductive composite layer, the both sides of the electrically conductive composite layer electrically connect with least one piece of pole piece respectively.
8. a kind of application of protection device as claimed in claim 7, it is characterised in that the protection device is protected as lithium battery
Protect device.
9. the application of a kind of protection device according to claim 8, it is characterised in that with side electricity in electrically conductive composite layer
At least one piece of pole piece of connection electrically connects with lithium battery pole ear；
Alternatively, at least one piece of pole piece electrically connected with opposite side in electrically conductive composite layer electrically connects with external circuit.
10. the application of a kind of protection device according to claim 9, it is characterised in that with side in electrically conductive composite layer
At least one piece of pole piece of electrical connection is serially connected with by way of being spirally connected and/or riveting with lithium battery pole ear to be formed in protection circuit
Conductive path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
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