CN109513576A - Determine the method and its application of the opening width of extrusion coated gasket - Google Patents
Determine the method and its application of the opening width of extrusion coated gasket Download PDFInfo
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- CN109513576A CN109513576A CN201910000977.6A CN201910000977A CN109513576A CN 109513576 A CN109513576 A CN 109513576A CN 201910000977 A CN201910000977 A CN 201910000977A CN 109513576 A CN109513576 A CN 109513576A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0254—Coating heads with slot-shaped outlet
- B05C5/0262—Coating heads with slot-shaped outlet adjustable in width, i.e. having lips movable relative to each other in order to modify the slot width, e.g. to close it
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0411—Methods of deposition of the material by extrusion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/06—Electrodes for primary cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/06—Electrodes for primary cells
- H01M4/08—Processes of manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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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 & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
It is an object of the invention to propose to determine the method and its application of the opening width of extrusion coated gasket.The method for determining the opening width of extrusion coated gasket includes: the first elasticity modulus for measuring slurry to be coated, the opening width of extrusion coated gasket is determined according to quadratic fit curve, wherein, quadratic fit curve through the following steps that determine: provide multiple standards coating sizing-agent；Measure the second elasticity modulus of multiple standards coating sizing-agent；Under the same conditions, extrusion coated processing is carried out to multiple standards coating sizing-agent using extrusion coated gasket, obtains multiple battery pole pieces；Measure the width y1 of multiple battery pole pieces；Multiple width differentials are determined according to formula y=y1-y2, wherein y indicates that width differential, y2 indicate the opening width of extrusion coated gasket；It is fitted based on multiple width differentials and multiple second elasticity modulus, obtains quadratic fit curve.Thus, it is possible to fast and accurately obtain the opening width of extrusion coated gasket.
Description
Technical field
The present invention relates to battery technology fields, specifically, be related to determine extrusion coated gasket opening width method and
Its apply, more particularly to determine extrusion coated gasket opening width method, prepare battery pole piece method, be used for
Prepare the extrusion coated equipment and battery pole piece of battery pole piece.
Background technique
Extrusion coated is used for since the remarkable advantages such as dimensionally stable, surface density stabilization are widely used in lithium battery industry
Prepare the battery pole piece of lithium battery.In extrusion coated, the width of battery pole piece is determined by coating gasket opening width, theoretically
The width of battery pole piece is equal to coating gasket opening width, wherein power battery mostly uses edge that foil mode is stayed to be coated, right
The width requirement for being coated with obtained pole piece is extremely stringent, and the difference of the molded breadth of the width and pole piece for the pole piece being coated with needs
Control is within ± 1mm.When the pole piece width that coating obtains is unqualified, it may appear that the edge thickness of pole piece is uneven, and
Phenomena such as subsequent cladding is bad, causing finished battery to occur, capacity difference, service life are short, and serious person can cause the dangerous rows such as the quick-fried spray of battery
For.Therefore the gasket of former coating apparatus can only be scrapped when the pole piece that appearance coating obtains is unqualified, redesigns gasket, makes
At biggish economic loss and the loss of time.
Research accordingly, with respect to coating apparatus gasket needs to be goed deep into.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is the method for proposing a kind of opening width of determining extrusion coated gasket, is prepared using the gasket that this method determines
Battery pole piece qualification rate it is higher, the cost for preparing battery pole piece can be reduced, shortening prepares the time of battery pole piece, Huo Zheshang
It is simple, accurate to state determining method.
An object of the present invention is to provide a kind of methods of the opening width of determining extrusion coated gasket.According to this hair
Bright embodiment, the method for the opening width of the determining extrusion coated gasket include: the first elasticity of measurement slurry to be coated
Modulus determines the opening width of the extrusion coated gasket according to quadratic fit curve, wherein the quadratic fit curve is logical
It crosses what following steps determined: multiple standards coating sizing-agent is provided, in a variety of standard coating sizing-agents and the slurry to be coated
Component it is identical, and at least one of component proportion in any two kinds of standard coating sizing-agents and solid content are different；It surveys
Second elasticity modulus of fixed a variety of standard coating sizing-agents；Under the same conditions, using the extrusion coated gasket to a variety of
The standard coating sizing-agent carries out extrusion coated processing, obtains multiple battery pole pieces；Measure the width of multiple battery pole pieces
y1；Multiple width differentials are determined according to formula y=y1-y2, wherein y indicates that the width differential, y2 indicate the extrusion coated
The opening width of gasket；It is fitted based on multiple width differentials and multiple second elasticity modulus, obtains described two
Secondary matched curve.
According to an embodiment of the invention, the method for the opening width of above-mentioned determining extrusion coated gasket can be determined accurately
Relational expression between the width differential and the second elasticity modulus, then according to the first elasticity modulus of slurry to be coated and the pass
It is formula, is accurately utilized the opening width that the slurry to be coated prepares required gasket when battery pole piece, it then can be accurate
Prepare needed for width battery pole piece, and then avoid the edge thickness of battery pole piece uneven or it is subsequent cladding it is bad phenomena such as
Occur, capacity and the service life that can so improve battery are short, reduce the generation of the dangerous phenomenons such as the quick-fried spray of battery；And pass through
The above method determines after the opening width of gasket, so that it may which raising prepares the qualification rate of battery pole piece, and then reduces and be prepared into
Sheet and time.
According to an embodiment of the invention, the equation of the quadratic fit curve is y=0.0035x2-0.1459x+
2.1399, wherein x indicates first elasticity modulus or second elasticity modulus.
Further, the composition of the standard coating sizing-agent and the slurry to be coated includes graphite, conductive black, carboxylic first
Base sodium cellulosate and butadiene-styrene latex.
Further, first elasticity modulus is 5~50Pa.
Further, the technological parameter of the extrusion coated meets the following conditions: pump speed is 10~100 revs/min；Coating
Gap between die head and back flow roll is 80~200 microns；The surface density of the standard coating sizing-agent of extrusion is 20~30mg/cm2。
It is another object of the present invention to propose a kind of method for preparing battery pole piece.According to an embodiment of the invention,
The method for preparing battery pole piece is the pad for being prepared using the method for extrusion coated, and being used in the extrusion coated
The opening width of piece is determined using mentioned-above method, wherein the component of slurry to be coated and standard coating sizing-agent
Component is identical.The qualification rate of the battery pole piece prepared as a result, is higher, reduces that battery pole piece edge thickness is uneven or subsequent packet
It covers the generation of phenomena such as bad, and then reduces preparation cost, shorten preparation time, and improve the battery using the battery pole piece
Service performance and security performance.
According to an embodiment of the invention, described crowded when the coating slurry to be coated and the coating standard coating sizing-agent
The technological parameter of extrusion cloth is identical.
Further, the actual value of the electrode plates obtained and the difference of theoretical value are less than or equal to 1 millimeter.
It is another object of the present invention to a kind of extrusion coated equipment for being used to prepare battery pole piece.It is according to the present invention
Embodiment, the opening width of the gasket in the extrusion coated equipment are the openings by determining extrusion coated gasket noted earlier
What the method for width determined.The qualification rate of the battery pole piece of extrusion coated equipment preparation is higher as a result, and then reduces and be prepared into
This, shortens preparation time.
It is another object of the present invention to a kind of battery pole pieces.According to an embodiment of the invention, the battery pole piece is
It is prepared using the method preparation noted earlier for preparing battery pole piece, or using mentioned-above extrusion coated equipment
's.The edge thickness of the battery pole piece is more uniform as a result, convenient for the cladding in subsequent technique, is prepared by the battery pole piece
The capacity of battery is high, the service life is long, safety coefficient is high.
Detailed description of the invention
Fig. 1 is the method flow diagram that the opening width of gasket is determined in one embodiment of the invention；
Fig. 2 is the quadratic fit curve in another embodiment of the present invention；
Fig. 3 is the structural schematic diagram of gasket in another embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail.The embodiments described below is exemplary, and is only used for explaining this hair
It is bright, and be not considered as limiting the invention.Particular technique or condition are not specified in embodiment, according to text in the art
It offers described technology or conditions or is carried out according to product description.Reagents or instruments used without specified manufacturer,
For can be with conventional products that are commercially available.
An object of the present invention is to provide a kind of methods of the opening width of determining extrusion coated gasket.According to this hair
Bright embodiment, the method for determining the opening width of extrusion coated gasket include: the first elasticity modulus for measuring slurry to be coated,
The opening width of extrusion coated gasket is determined according to quadratic fit curve, wherein referring to Fig.1, quadratic fit curve be by with
What lower step determined:
S100: providing multiple standards coating sizing-agent, and multiple standards coating sizing-agent is identical as the component in slurry to be coated, and
At least one of component proportion and solid content in any two kinds of standard coating sizing-agents are different.
According to an embodiment of the invention, being marked under the premise of the component in multiple standards coating sizing-agent is identical by changing
At least one of component proportion and solid content in quasi- coating sizing-agent are different (to change the springform of standard coating sizing-agent
Amount), it thus can be obtained by the different standard coating sizing-agent of a variety of elasticity modulus.Wherein, in multiple standards coating sizing-agent
Premised on component is identical, the precision of quadratic fit curve can be improved, and improve the accurate of the opening width for determining gasket
Degree, and then finally improve the precision of the width of the battery pole piece of preparation.
S200: the second elasticity modulus of measurement multiple standards coating sizing-agent.
According to an embodiment of the invention, there is no limit requirement, those skilled in the art for the method for the second elasticity modulus of measurement
It can flexible choice according to actual needs.In an embodiment of the present invention, is measured using Anton Paar MCR102 rheometer
Two elasticity modulus, specifically, respectively obtaining the shear strain of multiple standards coating sizing-agent using Anton Paar MCR102 rheometer
The curve graph of (%) and elasticity modulus, the maximum value of elastic membrane amount is second bullet of every kind of standard coating sizing-agent in the curve graph
Property modulus.
S300: under the same conditions, carrying out extrusion coated processing to multiple standards coating sizing-agent using extrusion coated gasket,
Obtain multiple battery pole pieces.Described " the same terms " include that the technological parameter of extrusion coated is identical.
According to an embodiment of the invention, carrying out extrusion coated under the same conditions, the essence of quadratic fit curve can be improved
Accuracy is improved the accuracy for being determined the opening width of gasket using the quadratic fit curve, and then improves and prepared using the gasket
Battery pole piece qualification rate.It should be noted that preparation battery pole piece whether He Ge criterion are as follows: required electrode pole
Difference between the theoretical value of piece width and the actual value for the battery pole piece width being prepared is less than or equal to 1 millimeter.
S400: the width y1 of multiple battery pole pieces is measured.
S500: multiple width differentials are determined according to formula y=y1-y2, wherein y indicates that width differential, y2 are indicated to squeeze and be applied
The opening width of cloth gasket.It is squeezed in step S300 it will be understood by those skilled in the art that extrusion coated gasket herein refers to
The gasket of coating standard coating sizing-agent.
S600: it is fitted based on multiple width differentials and multiple second elasticity modulus, obtains quadratic fit curve.
According to an embodiment of the invention, the method being specifically fitted is there is no limit requirement, those skilled in the art can basis
The method or software of any data fitting of actual demand flexible choice, for example can be that (function plotting is soft by Excel or origin
Part).
According to an embodiment of the invention, the method for the opening width of above-mentioned determining extrusion coated gasket can be determined accurately
Relational expression between the width differential and the second elasticity modulus, then according to the first elasticity modulus of slurry to be coated and the pass
It is formula, is accurately utilized the opening width that the slurry to be coated prepares required gasket when battery pole piece, it then can be accurate
Prepare needed for width battery pole piece, and then avoid the edge thickness of battery pole piece uneven or it is subsequent cladding it is bad phenomena such as
Occur, capacity and the service life that can so improve battery are short, reduce the generation of the dangerous phenomenons such as the quick-fried spray of battery；And pass through
The above method determines after the opening width of gasket, so that it may which raising prepares the qualification rate of battery pole piece, and then reduces and be prepared into
Sheet and time.
According to some embodiments of the present invention, the quadratic fit determined by the determination method of above-mentioned quadratic fit curve is bent
The equation of line is y=0.0035x2- 0.1459x+2.1399, wherein x indicates the first elasticity modulus or the second elasticity modulus.?
Equation y=0.0035x2In the determination method of -0.1459x+2.1399, the second springform of multiple standards coating sizing-agent is measured
Using the opening width y2 of gasket, the width y1 and multiple width differentials of obtained multiple battery pole pieces when amount, extrusion coated
The occurrence of y is referring to the following table 1, the quadratic fit being fitted by multiple width differential y and multiple second elasticity modulus
Curve is referring to Fig. 2.
Table 1
| Standard coating sizing-agent serial number | y2/mm | y1/mm | Second elasticity modulus x/Pa | y/mm |
| 1 | 280 | 280.7 | 26.05 | 0.7 |
| 2 | 280 | 281.3 | 34.21 | 1.3 |
| 3 | 280 | 281.5 | 36.11 | 1.5 |
| 4 | 280 | 281.9 | 40.71 | 1.9 |
| 5 | 280 | 282.1 | 42.13 | 2.1 |
| 6 | 280 | 282.6 | 43.61 | 2.6 |
According to an embodiment of the invention, using above-mentioned equation y=0.0035x to improve2- 0.1459x+2.1399 is determined
Gasket opening width precision, standard coating sizing-agent is identical as the composition of slurry to be coated, in some realities of the invention
It applies in example, the composition of standard coating sizing-agent and slurry to be coated includes graphite, conductive black (SP), sodium carboxymethylcellulose
(CMC) and butadiene-styrene latex (SBR).The service performance of the battery pole piece of above-mentioned composition preparation is preferable as a result,.Keeping said components
Under the premise of constant, the slurry to be coated of any proportion or solid content can be determined using above-mentioned equation prepares battery pole piece institute
The opening width of gasket is needed, and accuracy is high, effectively improves the qualification rate of the battery pole piece of preparation.
According to an embodiment of the invention, utilizing above-mentioned equation y=0.0035x to further improve2-0.1459x+
2.1399 determine the accuracy of the opening width of gasket, and the technique of extrusion coated is (including the coating process to standard coating sizing-agent
With the coating process of slurry to be coated) parameter meets the following conditions: pump speed is 10~100 revs/min, such as 10 revs/min, 20
Rev/min, 30 revs/min, 40 revs/min, 50 revs/min, 60 revs/min, 70 revs/min, 80 revs/min, 90 revs/min
Clock, 100 revs/min；Gap between coating die head (including upper die head and lower die head) and back flow roll is 80~200 microns, such as
80 microns, 100 microns, 120 microns, 140 microns, 160 microns, 180 microns or 200 microns；The standard coating sizing-agent of extrusion
Surface density is 20~30mg/cm2, for example be 20mg/cm2、22mg/cm2、24mg/cm2、26mg/cm2、28mg/cm2、30mg/
cm2.Technological parameter when technological parameter and extrusion coated standard coating sizing-agent when extrusion coated slurry to be coated exists as a result,
In above range, the actual value of obtained battery pole piece width further improves battery pole piece closer to theoretical value
Service performance and qualification rate.
According to an embodiment of the invention, in order to further increase using above-mentioned equation determine gasket opening width it is accurate
Degree, the first elasticity modulus be 5~50Pa, such as 5Pa, 10Pa, 15Pa, 20Pa, 25Pa, 30Pa, 35Pa, 40Pa, 45Pa,
50Pa.As a result, the first elasticity modulus of slurry to be coated within the above range when, according to above-mentioned equation calculation width differential, into
And the accuracy for obtaining the opening width of gasket is higher, the actual value for the battery pole piece width being thus prepared is more nearly reason
By value, it can the further qualification rate for improving the battery pole piece using gasket preparation.
According to an embodiment of the invention, the equipment for carrying out above-mentioned extrusion coated is not limited herein using conventional equipment
System requires.
The standard of the method for the opening width of above-mentioned determining extrusion coated gasket is verified below according to several specific embodiments
True property is (with above-mentioned equation y=0.0035x2It is illustrated for -0.1459x+2.1399):
Determine the theoretical value y1 of three battery pole piece width；Measure the first elasticity modulus x of three kinds of slurries to be coated；By
One elasticity modulus x substitutes into equation y=0.0035x2In -0.1459x+2.1399, three width differential y are obtained respectively；According to public affairs
Formula y=y1-y2 obtains the opening width y2 of required extrusion coated gasket；Then the gasket for being y2 according to the opening width of gasket
The above-mentioned three kinds of slurries to be coated of extrusion coated respectively, obtain three kinds of battery pole pieces；Measure three kinds of obtained battery pole piece width
Actual value；The actual value is compared with theoretical value, if the difference of the two is less than or equal to 1mm, what is illustrated is above-mentioned
Equation is correctly, to can use the opening width that the equation calculates gasket.Specific value in the above method is referring to table 2:
Table 2
In above-mentioned table 2, calculates width differential and refer to the width differential obtained according to above-mentioned equation calculation, developed width difference
Refer to the difference between the width of the battery pole piece actually obtained and the opening width of gasket, by comparison two groups of data it is found that
It calculates width differential and developed width difference differs very little, and can also be seen by the theoretical value and actual value of battery pole piece
Out, the width for the battery pole piece being prepared and the molded breadth of required battery pole piece are very close or even identical, it is possible thereby to
It proves, the accuracy of the opening width of above-mentioned determining extrusion coated gasket in the present invention.It should be noted that in table 2, according to meter
Calculate opening width y2 should be respectively 281.48,283.13 and 267.72, but actually preparation according to preparation factory requirement,
The numerical value of the opening width of gasket can only retain one decimal place, so the opening width y2 of the gasket of preparation is above-mentioned table 2
In numerical value (opening width prepares numerical value), it should be noted that, opening width prepares numerical value and the opening width meter that is calculated
Difference between the value that counts is less than or equal to 0.1mm.
It is another object of the present invention to propose a kind of method for preparing battery pole piece.According to an embodiment of the invention,
The method for preparing battery pole piece is the opening for the gasket for being prepared using the method for extrusion coated, and being used in extrusion coated
Width is determined using mentioned-above method, wherein the component of slurry to be coated is identical as the component of standard coating sizing-agent.
The qualification rate of the battery pole piece prepared as a result, is higher, reduces that battery pole piece edge thickness is uneven or subsequent cladding is bad equal shows
The generation of elephant, so reduce preparation cost, shorten preparation time, and improve using the battery of the battery pole piece service performance and
Security performance.
According to an embodiment of the invention, being coated with to be coated to further improve the qualification rate of the battery pole piece of preparation
Cloth slurry is identical with the technological parameter of extrusion coated when coating standard coating sizing-agent.It is missed thus, it is possible to further eliminate
Difference makes the actual value for the battery pole piece width of preparation arrived closer to theoretical value, and then further improves battery pole piece
Service performance and qualification rate.
According to an embodiment of the invention, the actual value of obtained electrode plates and the difference of theoretical value are less than or equal to 1 milli
Rice.Thus, it is possible to the generation for phenomena such as improving the uniformity of battery pole piece edge thickness, avoiding subsequent cladding bad, Jin Erti
The capacity and security performance of high battery, and extend the service life of battery.
According to an embodiment of the invention, preparing the specific process step of battery pole piece by extrusion coated, there is no limit wanted
It asks, those skilled in the art prepare according to conventional technical means.
It is another object of the present invention to a kind of extrusion coated equipment for being used to prepare battery pole piece.It is according to the present invention
Embodiment, the opening width of the gasket in the extrusion coated equipment are the openings by determining extrusion coated gasket noted earlier
What the method for width determined, the structural schematic diagram of gasket 10 is referring to Fig. 3, and wherein D is the opening width of gasket.The extruding as a result,
The qualification rate of the battery pole piece of coating apparatus preparation is higher, and then reduces preparation cost, shortens preparation time.
It will be understood by those skilled in the art that the extrusion coated equipment is in addition to mentioned-above gasket, it further include routine
Structure essential to extrusion coated equipment or component, such as die head (including upper die head and lower die head), feed unit, back flow roll, position
Set the structures such as sensor, drying box or component.
It is another object of the present invention to a kind of battery pole pieces.According to an embodiment of the invention, the battery pole piece is
It is prepared using the method preparation noted earlier for preparing battery pole piece, or using mentioned-above extrusion coated equipment
's.The edge thickness of the battery pole piece is more uniform as a result, convenient for the cladding in subsequent technique, is prepared by the battery pole piece
The capacity of battery is high, the service life is long, safety coefficient is high.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of method of the opening width of determining extrusion coated gasket characterized by comprising
The first elasticity modulus for measuring slurry to be coated determines that the opening of the extrusion coated gasket is wide according to quadratic fit curve
Degree, wherein the quadratic fit curve through the following steps that determine:
Multiple standards coating sizing-agent is provided, a variety of standard coating sizing-agents are identical as the component in the slurry to be coated, and
At least one of component proportion and solid content in any two kinds of standard coating sizing-agents are different；
Measure the second elasticity modulus of a variety of standard coating sizing-agents；
Under the same conditions, extrusion coated processing is carried out to a variety of standard coating sizing-agents using the extrusion coated gasket,
Obtain multiple battery pole pieces；
Measure the width y1 of multiple battery pole pieces；
Multiple width differentials are determined according to formula y=y1-y2, wherein y indicates that the width differential, y2 indicate that the extruding applies
The opening width of cloth gasket；
It is fitted based on multiple width differentials and multiple second elasticity modulus, obtains the quadratic fit curve.
2. the method according to claim 1, wherein the equation of the quadratic fit curve is y=0.0035x2-
0.1459x+2.1399, wherein x indicates first elasticity modulus or second elasticity modulus.
3. according to the method described in claim 2, it is characterized in that, the group of the standard coating sizing-agent and the slurry to be coated
At including graphite, conductive black, sodium carboxymethylcellulose and butadiene-styrene latex.
4. according to the method described in claim 2, it is characterized in that, first elasticity modulus is 5~50Pa.
5. according to the method described in claim 2, it is characterized in that, the technological parameter of the extrusion coated meets the following conditions:
Pump speed is 10~100 revs/min；Gap between coating die head and back flow roll is 80~200 microns；The standard squeezed out
The surface density of coating sizing-agent is 20~30mg/cm2。
6. a kind of method for preparing battery pole piece, which is characterized in that it is to be prepared using the method for extrusion coated, and it is described
The opening width of the gasket used in extrusion coated is determined using method described in any one of Claims 1 to 55,
In, the component of slurry to be coated is identical as the component of standard coating sizing-agent.
7. according to the method described in claim 6, it is characterized in that, being starched when the slurry to be coated is coated with standard coating
When material coating, the technological parameter of the extrusion coated is identical.
8. method according to claim 6 or 7, which is characterized in that the width actual value of the obtained electrode plates with
The width differential of width theoretical value is less than or equal to 1 millimeter.
9. a kind of extrusion coated equipment for being used to prepare battery pole piece, which is characterized in that the gasket in the extrusion coated equipment
Opening width be to be determined by method according to any one of claims 1 to 5.
10. a kind of battery pole piece, which is characterized in that be prepared using the method described in any one of claim 6~8, or
Person is prepared using extrusion coated equipment as claimed in claim 9.
Priority Applications (1)
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| CN206262799U (en) * | 2016-11-18 | 2017-06-20 | 东莞新能源科技有限公司 | Extrusion coated device and its pad |
| CN206304983U (en) * | 2016-11-21 | 2017-07-07 | 宁德新能源科技有限公司 | Extrusion coated pad and extrusion coated die head |
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| US20110287171A1 (en) * | 2010-05-24 | 2011-11-24 | Samsung Sdi Co., Ltd. | Active material coating apparatus and coating method using the same |
| JP2015136675A (en) * | 2014-01-24 | 2015-07-30 | Ｎｅｃエナジーデバイス株式会社 | Coating apparatus, assembly method of coating apparatus, and manufacturing method of electrode for secondary battery |
| CN106711394A (en) * | 2015-11-13 | 2017-05-24 | 深圳市比克动力电池有限公司 | Electrode coating method |
| CN105413981A (en) * | 2015-12-16 | 2016-03-23 | 湖南耐普恩科技有限公司 | Extrusion type double-surface coating method |
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