CN208298924U - Pole piece and electrochemical appliance - Google Patents
Pole piece and electrochemical appliance Download PDFInfo
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- CN208298924U CN208298924U CN201820618455.3U CN201820618455U CN208298924U CN 208298924 U CN208298924 U CN 208298924U CN 201820618455 U CN201820618455 U CN 201820618455U CN 208298924 U CN208298924 U CN 208298924U
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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 pole piece and electrochemical appliance, pole piece includes: collector and protective layer, and the protective layer is set at least one surface of the collector, and the protective layer is to puncture displacement to be greater than the coat that 2mm is less than 10mm.Thus; cooperated by collector and protective layer; can to collector carry out effective protection, can also be effectively improved as collector fractured edge it is exposed caused by short circuit problem, the security performance of electrochemical appliance can be improved; and; the preparation method of pole piece is simple, easily operated, is suitble to large-scale production; meanwhile it will not influence the consistency of electrochemical appliance.
Description
Technical field
The utility model relates to electrochemical technology field, in particular to a kind of pole piece and the electrochemistry dress with the pole piece
It sets.
Background technique
Lithium ion secondary battery because it is high with energy density, have extended cycle life, the performance that open-circuit voltage height etc. is excellent due to it is wide
It is general to be applied to the field of consumer electronics such as mobile phone, laptop.Recently as lithium ion secondary battery energy density
Promotion, application field is gradually extended to the high-technology fields such as electric vehicle.But lithium ion secondary battery is in use
It will appear some unpredictable abuse conditions, seriously threaten consumer safety, therefore the security performance of lithium ion secondary battery
Seriously affect the large-scale application of lithium ion secondary battery.
Utility model content
The utility model aims to solve at least one of the technical problems existing in the prior art.For this purpose, the utility model mentions
A kind of pole piece out, the pole piece can carry out effective protection to collector, can also be effectively improved since collector fractured edge is naked
The security performance of electrochemical appliance can be improved in short circuit problem caused by dew.
The utility model further proposes a kind of electrochemical appliance.
Pole piece according to the present utility model includes: collector, active material layer and protective layer, and the protective layer is located at described
Between collector and the active material layer, the protective layer is to puncture displacement to be greater than the coat that 2mm is less than 10mm.
Pole piece according to the present utility model is cooperated by collector and protective layer, can carry out effective protection to collector,
Also can be effectively improved as collector fractured edge it is exposed caused by short circuit problem, the safety of electrochemical appliance can be improved
Can, also, the preparation method of pole piece is simple, and it is easily operated, it is suitble to large-scale production, meanwhile, it will not influence electrochemical appliance
Consistency.
Optionally, wherein the protective layer is to puncture displacement to be greater than the coat that 3mm is less than 7mm.
Further, wherein the thickness of the protective layer is between 2 μm and 9 μm.
Specifically, wherein the thickness of the protective layer is between 3 μm and 6 μm.
Optionally, the pole piece, further includes adhesive layer, wherein the adhesive layer is arranged at the collector and institute
State protection interlayer.
Further, wherein the thickness of the adhesive layer is between 0 and 2 μm.
Specifically, wherein the adhesive layer is the bonding agent for including conductive agent.
Optionally, wherein the collector is hot bonding with the protective layer.
Further, wherein the protective layer is self-conductive polymer-coated layer.
Specifically, wherein the protective layer be include polyacetylene and its derivative, polypyrrole and its derivative, polythiophene
And its derivative, polyphenylene sulfide and its derivative, Polyaniline and its derivative, polyacrylonitrile and its derivative, poly quinoline and its
The coat of one or more of derivative, polyparaphenylene and its derivative.
Optionally, wherein the protective layer is the protective layer for including conductive agent.
Further, wherein the protective layer be include one or more of polyolefin, polyamide, Kynoar
Coat.
Electrochemical appliance according to the present utility model, wherein including above-mentioned pole piece.
Detailed description of the invention
The above-mentioned additional aspect and advantage of the utility model will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is the cross-sectional view according to one embodiment of the pole piece of the utility model embodiment；
Fig. 2 is the cross-sectional view according to another embodiment of the pole piece of the utility model embodiment；
Fig. 3 is the schematic diagram for puncturing displacement measurement needle and passing through protective layer according to the pole piece of the utility model embodiment.
Appended drawing reference:
Pole piece 10；
Protective layer 1；Collector 2；Adhesive layer 3；Active material layer 4；Puncture displacement measurement needle 5.
Specific embodiment
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and is only used for explaining the utility model, and should not be understood as to the utility model
Limitation.
In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " suitable
The orientation or positional relationship of the instructions such as hour hands ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " is orientation based on the figure
Or positional relationship, be merely for convenience of describing the present invention and simplifying the description, rather than the device of indication or suggestion meaning or
Element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as the limit to the utility model
System.In addition, defining " first ", the feature of " second " can explicitly or implicitly include one or more of the features.
In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the present invention.
Below with reference to Fig. 1-Fig. 3 detailed description according to the pole piece 10 of the utility model embodiment.
It as shown in figures 1 and 3, include: collector 2 and protective layer 1, afflux according to the pole piece of the utility model embodiment 10
Body 2 can be selected from one of copper foil, aluminium foil, stainless steel foil, nickel foil or several, such as: collector 2 is selected from aluminium foil, stainless steel
One or both of foil, according to the difference of material selected by collector 2, collector 2 both can be used for anode, can be used for
Cathode, such as: collector 2 is for anode.
Protective layer 1 is set at least one surface of collector 2, it should be noted that protective layer 1 can be only set to
On one surface of collector 2, it can also be set to simultaneously on two surfaces of collector 2, protective layer 1 has conducting function,
Protective layer 1 is to puncture displacement to be greater than the coat that 2mm is less than 10mm, and 10mm herein is substantially the puncture of existing protective layer material
Displacement limits, future might have the higher material for puncturing displacement, its certain protecting effect is also more preferable.Also, protective layer 1 is worn
It pierces intensity and is greater than 500 grams.
Active material layer 4 is set to the surface of protective layer 1.Active material layer 4 can be anode active material layer, and ingredient is
Anode active material (such as graphite, silicon, lithium carbonate), conductive agent, binder mixed coating.Active material layer 4 or yin
Pole active material layer, ingredient be cathode active material (such as cobalt acid lithium, LiFePO4, ternary material) conductive agent, binder it is mixed
Close coating.
Wherein, pole piece 10 is arranged on electrochemical appliance, and protective layer 1 is formed by polymer polymerizing, the resistance of protective layer 1
The rate 3-5 order of magnitude higher than the resistivity of collector 2, protective layer 1 can be stabilized in the electrolytic solution, and protective layer 1 has
There is the characteristic of resistance to oxidation, therefore, protective layer 1 can carry out effective protection to the surface of collector 2, simultaneously as protective layer 1
Puncture strength is greater than 500 grams, punctures displacement and is greater than 2mm, and protective layer 1 is much larger than the mechanical property of collector 2, when external conductor pierces
When wearing collector 2, it is greater than the deformation of collector 2 in the deformation for the incision position protective layer 1 that puncture site is formed, protective layer 1 can will collect
The fracture of fluid 2 wraps, can reduce fractured edge it is exposed caused by short circuit problem generation, so as to be effectively improved by
The short circuit problem caused by 2 fractured edge of collector is exposed.
In addition, due to the high 3-5 order of magnitude of the resistivity of the resistivity ratio collector 2 of protective layer 1, it is preferable that protective layer 1
Resistivity be 1500 times -20000 times of resistivity of collector 2, while protective layer 1 wraps 2 fracture of collector
Short circuit current can be reduced, the risk for internal short-circuit occur can be reduced, the security performance of electrochemical appliance can be obviously improved, and
And the preparation method of the pole piece 10 is simple, and it is easily operated, it is suitble to large-scale production, meanwhile, it will not influence the one of electrochemical appliance
Cause property.
Cooperated as a result, by collector 2 and protective layer 1, effective protection can be carried out to collector 2, also can effectively changed
It is kind as 2 fractured edge of collector it is exposed caused by short circuit problem, the security performance of electrochemical appliance, also, pole can be improved
The preparation method of piece 10 is simple, easily operated, is suitble to large-scale production, meanwhile, it will not influence the consistency of electrochemical appliance.
Optionally, protective layer 1 can be to puncture the coat that displacement is greater than 3mm, and such setting is capable of increasing protective layer 1
Displacement is punctured, the mechanical property of protective layer 1 can be promoted, when external conductor pierces through collector 2, the puncture displacement of protective layer 1
Bigger, protective layer 1 is less susceptible to crack after being pierced, and pierced protective layer 1, which can wrap, pierces through object and fracture site, can
To further prevent electrochemical appliance internal short-circuit, improve the security performance of electrochemical appliance, meanwhile, the stretching of protective layer 1 is strong
Degree is bigger, is conducive to the processing and production of collector 2, more so as to improve the processing performance of collector 2.
Further, the thickness of protective layer 1 can be 2 μm -9 μm, and the thickness more adduction that can make protective layer 1 is arranged such
Reason can make preparation process become simple, conveniently, be conducive to the large-scale production of pole piece 10, also, can also make protective layer 1
Resistance sizes it is more suitable, the internal resistance of electrochemical appliance can be made more reasonable, thereby may be ensured that will not fill electrochemistry
The normal use set has an impact.
Specifically, the thickness of protective layer 1 can be 3 μm -6 μm, and setting in this way can further make the thickness of protective layer 1 more
Adduction reason, can further make preparation process become simple, conveniently, be more conducive to the large-scale production of pole piece 10, also,
It can further make the resistance sizes of protective layer 1 more suitable, can further make the internal resistance of electrochemical appliance more reasonable, from
And may further ensure that will not have an impact the normal use of electrochemical appliance.
As shown in Figure 1, a specific embodiment according to the present utility model, is provided with viscous between collector 2 and protective layer 1
Layer 3 is connect, adhesive layer 3 can reliably bond together collector 2 and protective layer 1, so as to prevent collector 2 and protection
Layer 1 separates.
Further, the thickness of adhesive layer 3 can be 0-2 μm, and setting in this way can make the thickness design of adhesive layer 3 more
Rationally, adhesive layer 3 can be made thinner, is transmitted between positive and negative anodes to will not influence ion, and then can guarantee that electrochemistry fills
The functional reliability set.
Specifically, adhesive layer 3 can be the bonding agent for including conductive agent, binder can by intaglio printing, spraying coating,
The methods of dimple version printing, transfer coated are uniformly transferred on collector 2, also, adhesive layer 3 also may include hot melt adhesive, wherein
The specific type of bonding agent is unrestricted, and bonding agent can be selected from Kynoar, ptfe emulsion, polyacrylate, carboxylic
One of sodium carboxymethylcellulose pyce, butadiene-styrene rubber, polyurethane are several, and the working performance that can promote bonding agent is arranged such.
The specific type of hot melt adhesive is also unrestricted, and hot melt adhesive can be selected from TPU (Thermoplastic Urethane- heat
Plastic polyurethane elastomer) hot melt adhesive, EVA (Ethylene Viny Acetate- ethylene-Vinyl acetateCopolymer) hot melt adhesive,
One or more of butyl sealant.Conductive agent can also be added in the binder, the conductive agent includes acetylene black, conduction
One of carbon black, carbon fiber, carbon nanotube, Ketjen black are several, and setting in this way can guarantee the reliable operation of hot melt adhesive
Property, so as to promote the working performance of hot melt adhesive.
As shown in Fig. 2, another specific embodiment according to the present utility model, collector 2 are hot bonding with protective layer 1,
In this way setting can save setting adhesive layer 3 process, can simplify the structure of pole piece 10, so as to so that pole piece 10 processing
It is simpler, conveniently.It is bonded in addition, collector 2 can also coat adhesive layer 3 with protective layer 1 while hot pressing.
Further, protective layer 1 can be self-conductive polymer-coated layer 1, it is to be understood that protective layer 1 is by certainly
Conducting polymer composition, wherein self-conductance electric polymer can be polymer with a conjugated structure through chemistry or electrochemical doping
A kind of material formed afterwards, self-conductive polymer-coated layer 1 have conducting function, and such setting can guarantee that pole piece 10 works normally.
Specifically, protective layer 1 can be include polyacetylene and its derivative, polypyrrole and its derivative, polythiophene and its
Derivative, polyphenylene sulfide and its derivative, Polyaniline and its derivative, polyacrylonitrile and its derivative, poly quinoline and its derivative
One of object, polyparaphenylene and its derivative or several coats, it should be noted that protective layer 1 includes polyacetylene
And its derivative, polypyrrole and its derivative, polythiophene and its derivative, polyphenylene sulfide and its derivative, polyaniline and its spread out
Type in biology, polyacrylonitrile and its derivative, poly quinoline and its derivative, polyparaphenylene and its derivative is more than or equal to one
Kind, the working performance for being able to ascend protective layer 1 is set in this way, protective layer 1 can be made preferably to participate in work.
Optionally, protective layer 1 or the protective layer 1 including conductive agent, it is to be understood that protective layer 1 can wrap
Include non-conductive polymer and conductive agent, non-conductive polymer can be selected from polyethylene terephthalate, polyethylene, in polypropylene
One or several kinds.Conductive agent can be selected from conductive black, carbon fiber, metal powder, metallic fiber, metal coated carbon fiber, carbon
One of nanotube, graphite are several.The working performance that can further promote protective layer 1 is arranged such.
Further, protective layer 1 may be including one of polyolefin, polyamide, Kynoar or several
Coat, such setting the manufacture material of protective layer 1 can be made more reasonable, so as to further promote protective layer 1
Functional reliability.
As shown in figure 3, W, which is represented, punctures displacement, the puncture displacement method of test protective layer 1 is, using membrane puncture intensity
Test equipment makes collector 2 of the speed puncture with matcoveredn 1 for puncturing displacement measurement needle 5 with 50mm/min, then gently
It is from position of threading a needle that the collector 2 with matcoveredn 1 is into two pieces with blade, it removes and punctures displacement measurement needle 5 and with guarantor
Then collector 2 with matcoveredn 1 is fixed with fixture, is put into the microscopical visual field vertically by the collector 2 of sheath 1, survey
The length of film burr is tried, 20 positions of test are amounted to, then can calculate puncture displacement and confidence level.
According to the electrochemical appliance of the utility model embodiment, the pole piece 10 including above-described embodiment, electrochemical appliance is also
It may include: positive plate, negative electrode tab, isolation film, pack case and electrolyte etc., electrochemical energy storage device can be super capacitor
Device, lithium ion secondary battery, sodium ion secondary battery, pole piece 10 setting is mounted on electrochemical appliance, can to collector 2 into
Row effective protection, can also be effectively improved as 2 fractured edge of collector it is exposed caused by short circuit problem, electrochemistry can be improved
The security performance of device, also, the preparation method of pole piece 10 is simple, and it is easily operated, it is suitble to large-scale production, meanwhile, Bu Huiying
Ring the consistency of electrochemical appliance.
During producing collector 2, a thickness is coated on a surface of collector 2 using the method for spraying coating
The bonding agent that degree is 1 μm, bonding agent include Kynoar and conductive black, then press a protective layer 1, protective layer 1
It is then another using spray coating method coating on another surface of collector 2 again for the polypropylene film containing conductive black
Then layer presses an another protective layer 1, obtains modified pole piece 10 with a thickness of 1 μm of bonding agent.
During producing positive plate, solvent N-methyl pyrilidone and binder Kynoar are added to stirring
In grinder, dissolves it under vacuum conditions completely, obtain oiliness Kynoar solution；Conductive agent conductive black is added again
Enter into the oiliness Kynoar solution dissolved, quick agitation grinding to fineness is 5 μm or less；It adds later just
Pole active material cobalt acid lithium, and stir evenly under vacuum conditions；Positive slurry is obtained with the filtering of 200 mesh stainless steel mesh later
Material, the solid content of anode sizing agent are 41%；Anode sizing agent is then uniformly coated on to the two sides of above-mentioned collector 2, then uses roller
Press compacting, last cut-parts, soldering polar ear are to get the positive plate for arriving lithium ion secondary battery.Wherein, positive active material, viscous
Tie agent, the mass ratio of conductive agent is 92:4:4.
During producing negative electrode tab, solvent deionized water and thickener sodium carboxymethylcellulose are added to stirring and ground
In grinding machine, dissolves it under vacuum conditions completely, obtain aqueous high molecular solution；Conductive agent conductive black is added to again
In aqueous high molecular solution through having dissolved, quick agitation grinding to fineness is 5 μm or less；Negative electrode active material is added later
Artificial graphite, and be slowly stirred under vacuum conditions uniformly；Bonding agent butadiene-styrene latex is added later, and slow in vacuum condition
It stirs evenly；Negative electrode slurry is obtained with the filtering of 150 mesh stainless steel mesh later, wherein the solid content of negative electrode slurry is
67%；Negative electrode slurry is then uniformly coated on to the two sides of the collector 2 with a thickness of 8 μm, obtains cathode membrane after dry, then use
Roll squeezer compacting, last cut-parts, soldering polar ear are to get the negative electrode tab for arriving lithium ion secondary battery.Wherein, negative electrode active material,
Conductive agent, binder, thickener mass ratio be 94.5:1.5:2:2.
The preparation of electrolyte, in water content < 10ppm argon atmosphere glove box, by ethylene carbonate, propylene carbonate
Ester, dimethyl carbonate are that 1:1:1 is mixed according to volume ratio, are then dissolved in sufficiently dry lithium salts LiPF6 and are mixed with
In solvent, electrolyte is obtained after mixing, and wherein the concentration of LiPF6 is 1M.
The isolation film of lithium ion secondary battery is done in the preparation of isolation film with 16 microns thick of polypropylene isolation film.
The preparation of lithium ion secondary battery folds positive plate, isolation film, negative electrode tab in order, make isolation film be in just,
Play the role of isolation between negative electrode tab, then winding obtains naked battery core；Naked battery core is placed in outer packing foil, by above-mentioned preparation
Good electrolyte is injected into the battery core after drying, by processes such as Vacuum Package, standing, chemical conversion, shapings, obtains lithium ion two
Primary cell.
The preparation process of embodiment two, lithium ion secondary battery is with the difference of above-described embodiment, the system of collector 2
It is standby, it punctures displacement and is greater than 2mm, the fracture elongation of protective layer 1 is 30%.
The preparation process of embodiment three, lithium ion secondary battery is with the difference of above-described embodiment, the system of collector 2
It is standby, it punctures displacement and is greater than 4mm, the fracture elongation of protective layer 1 is 80%.
The preparation process of example IV, lithium ion secondary battery is with the difference of above-described embodiment, the system of collector 2
It is standby, it punctures displacement and is greater than 5mm, the fracture elongation of protective layer 1 is 120%.
The preparation process of embodiment five, lithium ion secondary battery is with the difference of above-described embodiment, the system of collector 2
Standby, the resistivity of protective layer 1 is 1500 times of the resistivity of collector 2.
The preparation process of embodiment six, lithium ion secondary battery is with the difference of above-described embodiment, the system of collector 2
Standby, the resistivity of protective layer 1 is 100000 times of the resistivity of collector 2.
The preparation process of embodiment seven, lithium ion secondary battery is with the difference of above-described embodiment, the system of collector 2
It is standby, protective layer 1 with a thickness of 2 μm.
The preparation process of embodiment eight, lithium ion secondary battery is with the difference of above-described embodiment, the system of collector 2
It is standby, protective layer 1 with a thickness of 3 μm.
The preparation process of embodiment nine, lithium ion secondary battery is with the difference of above-described embodiment, the system of collector 2
It is standby, protective layer 1 with a thickness of 6 μm.
The preparation process of embodiment ten, lithium ion secondary battery is with the difference of above-described embodiment, the system of collector 2
It is standby, protective layer 1 with a thickness of 9 μm.
The preparation process of embodiment 11, lithium ion secondary battery is with the difference of above-described embodiment, the system of collector 2
Standby, puncture strength is greater than 500 grams.
The preparation process of embodiment 12, lithium ion secondary battery is with the difference of above-described embodiment, the system of collector 2
Standby, puncture strength is greater than 800 grams.
The preparation process of embodiment 13, lithium ion secondary battery is with the difference of above-described embodiment, the system of collector 2
It is standby, protective layer 1 is slowly heated and is pressed on two surfaces of collector 2, obtain modified collector 2, protective layer 1 is containing leading
The polypropylene film of electric carbon black punctures displacement and is greater than 3mm, and the resistivity of protective layer 1 is 20000 times of the resistivity of collector 2,
Protective layer 1 with a thickness of 4 μm, puncture strength is greater than 1000 grams.
The preparation process of embodiment 14, lithium ion secondary battery is with the difference of above-described embodiment, the system of collector 2
Standby, protective layer 1 uses polythiofuran derivative film.The puncture displacement of film is greater than 2mm, and the resistivity of protective layer 1 is collector 2
20000 times of resistivity, protective layer 1 with a thickness of 4 μm, puncture strength is greater than 1000 grams.
The preparation process of comparative example 1, lithium ion secondary battery is with the difference of above-described embodiment, the preparation of collector 2,
Using aluminium foil as anode pole piece 10, and processing is not modified to aluminium foil.
The preparation process of comparative example 2, lithium ion secondary battery is with the difference of above-described embodiment, the preparation of collector 2,
It punctures displacement and is greater than 1.5mm.
The preparation process of comparative example 3, lithium ion secondary battery is with the difference of above-described embodiment, the preparation of collector 2,
Film with a thickness of 12 μm.
The preparation process of comparative example 4, lithium ion secondary battery is with the difference of above-described embodiment, the preparation of collector 2,
Puncture strength is greater than 400 grams.
The preparation process of comparative example 5, lithium ion secondary battery is with the difference of above-described embodiment, the preparation of collector 2,
The resistivity of protective layer 1 is 300 times of the resistivity of collector 2.
The preparation process of comparative example 6, lithium ion secondary battery is with the difference of above-described embodiment, the preparation of collector 2,
The resistivity of protective layer 1 is 2000000 times of the resistivity of collector 2.
The test process of lithium ion secondary battery will be illustrated next.
(1) puncture strength of protective layer 1 and puncture Shifted Reference GBT10004.
(2) resistivity measurement of protective layer 1 and collector 2.
Protective layer 1 and collector 2 are first cut into the sample that length and width is 10mm, surveyed respectively using four-point probe
Try the resistivity of protective layer 1 and body of fluid sample.
(3) resistance test of positive plate.
The collector of positive plate 2 is first cut into the sample that diameter is 20mm, one-site model is set using four terminal alternating current methods
Pressure be 25MPa, the sampling site time is 15s, then to 2 loading current of the collector of positive plate, record under the loading current
Voltage calculates the resistance of the collector 2 of positive plate according to electric current and voltage.
(4) the drift bolt test of lithium ion secondary battery.
At 25 DEG C, with 0.5C constant-current charge to voltage it is 4.3V by lithium ion secondary battery, is filled later with 4.3V constant pressure
Electricity to electric current is 0.05C, then carries out drift bolt test to lithium ion secondary battery, wherein drift bolt rate is 100mm/s, thickness
2.5mm, drift bolt test do not exploded with lithium ion secondary battery, it is not on fire be pass through, 100 lithium ion secondary electricity of every group of test
Pond calculates the drift bolt test percent of pass of lithium ion secondary battery.
The parameter and the performance test results of table 1 embodiment one-ten four and comparative example 1-6.
From the test result of table 1 it is found that in embodiment one-ten four and comparative example 1, using the pole piece 10 of the utility model
Lithium ion secondary battery drift bolt test percent of pass be apparently higher than only with collector 2 do anode pole piece 10 lithium ion two
Primary cell, this illustrates that the pole piece 10 of the utility model is significantly improved the security performance of lithium ion secondary battery.
In embodiment one-four and comparative example 1-2, the fracture elongation of protective layer 1 is bigger, and lithium ion secondary battery is worn
Nail test percent of pass is bigger, and the security performance of lithium ion secondary battery improves obvious.
In embodiment one, embodiment five-six and comparative example 5-6, the resistivity of protective layer 1 is higher, lithium ion secondary electricity
The drift bolt test percent of pass in pond is higher.
In embodiment one, embodiment seven-ten and comparative example 3, the thickness of protective layer 1 is bigger, lithium ion secondary battery
It is higher that drift bolt tests percent of pass.
In embodiment one, embodiment ten one-ten two and comparative example 4, the puncture of protective layer 1 is displaced bigger, lithium ion two
The drift bolt test percent of pass of primary cell is higher, the security performance of lithium ion secondary battery be improved significantly.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. means specific features described in conjunction with this embodiment or example, knot
Structure, material or feature are contained at least one embodiment or example of the utility model.In the present specification, to above-mentioned art
The schematic representation of language may not refer to the same embodiment or example.Moreover, description specific features, structure, material or
Person's feature can be combined in any suitable manner in any one or more of the embodiments or examples.
While there has been shown and described that the embodiments of the present invention, it will be understood by those skilled in the art that:
These embodiments can be carried out with a variety of variations, modification, replacement in the case where not departing from the principles of the present invention and objective
And modification, the scope of the utility model are defined by the claims and their equivalents.
Claims (10)
1. a kind of pole piece, wherein include:
Collector；
Active material layer；
Protective layer, between the collector and the active material layer, the puncture displacement of the protective layer is less than greater than 2mm
10mm。
2. pole piece according to claim 1, wherein the puncture displacement of the protective layer is greater than 3mm and is less than 7mm.
3. pole piece according to claim 1, wherein the thickness of the protective layer is greater than 2 μm less than 9 μm.
4. pole piece according to claim 3, wherein the thickness of the protective layer is greater than 3 μm less than 6 μm.
5. pole piece according to claim 1, wherein further include adhesive layer, wherein the adhesive layer is arranged at the collection
Fluid and the protection interlayer.
6. pole piece according to claim 5, wherein the thickness of the adhesive layer is between 0 and 2 μm.
7. pole piece according to claim 5, wherein the adhesive layer includes conductive agent.
8. pole piece according to claim 1, wherein the protective layer includes self-conductance electric polymer.
9. pole piece according to claim 1, wherein the protective layer includes conductive agent.
10. a kind of electrochemical appliance, wherein including pole piece of any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820618455.3U CN208298924U (en) | 2018-04-27 | 2018-04-27 | Pole piece and electrochemical appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820618455.3U CN208298924U (en) | 2018-04-27 | 2018-04-27 | Pole piece and electrochemical appliance |
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| Publication Number | Publication Date |
|---|---|
| CN208298924U true CN208298924U (en) | 2018-12-28 |
Family
ID=64703763
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| CN201820618455.3U Active CN208298924U (en) | 2018-04-27 | 2018-04-27 | Pole piece and electrochemical appliance |
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| CN110400933A (en) * | 2019-08-08 | 2019-11-01 | 宁德时代新能源科技股份有限公司 | Positive pole piece and electrochemical device comprising same |
| CN110931800A (en) * | 2019-04-26 | 2020-03-27 | 宁德时代新能源科技股份有限公司 | Battery with a battery cell |
| CN112349874A (en) * | 2019-08-08 | 2021-02-09 | 宁德时代新能源科技股份有限公司 | Positive pole piece and lithium ion battery |
| CN110943200B (en) * | 2019-04-15 | 2021-03-09 | 宁德时代新能源科技股份有限公司 | Electrode plate and electrochemical device |
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| CN112349874A (en) * | 2019-08-08 | 2021-02-09 | 宁德时代新能源科技股份有限公司 | Positive pole piece and lithium ion battery |
| CN112349874B (en) * | 2019-08-08 | 2021-11-09 | 宁德时代新能源科技股份有限公司 | Positive pole piece and lithium ion battery |
| US11894524B2 (en) | 2019-08-08 | 2024-02-06 | Contemporary Amperex Technology Co., Limited | Positive electrode plate, and electrochemical apparatus and device associated therewith |
| WO2021243915A1 (en) * | 2020-06-03 | 2021-12-09 | 江苏时代新能源科技有限公司 | Lithium ion battery and device thereof |
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