CN108400281A - A kind of preparation method of pole piece - Google Patents
A kind of preparation method of pole piece Download PDFInfo
- Publication number
- CN108400281A CN108400281A CN201810058876.XA CN201810058876A CN108400281A CN 108400281 A CN108400281 A CN 108400281A CN 201810058876 A CN201810058876 A CN 201810058876A CN 108400281 A CN108400281 A CN 108400281A
- Authority
- CN
- China
- Prior art keywords
- pole piece
- lug
- preparation
- collector
- areas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
-
- 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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- 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)
- Composite Materials (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The present invention relates to a kind of preparation methods of pole piece.The preparation method includes：Electrode slurry is coated in collection liquid surface, coating area and the areas Kong Bo are formed in collection liquid surface after drying；Part excision is carried out to the collector in the areas Kong Bo, then carries out roll-in film-making.The present invention provides the preparation method of pole piece, the collector in the areas Xian Duikongbo carries out part excision, then roll operation is carried out, the part collector in the areas Kong Bo is wherein cut off in advance, it can mitigate, disperse the stress that the collector in the areas Kong Bo is subject in roll-in and distraction procedure, and then reduce the power that fold is generated in the juncture area of the areas Kong Bo and coating area, improve fold, belt phenomenon of the pole piece in preparation process, improves the production quality of pole piece.
Description
Technical field
The invention belongs to the pole piece fields of lithium ion battery, and in particular to a kind of preparation method of pole piece.
Background technology
Lithium ion battery because having the characteristics that energy density is high, having extended cycle life, it is environmentally protective be widely used in automobile,
The fields such as consumption electronic product and energy storage.Currently, requirement of the people to battery energy density is higher and higher, it is close to improve the energy content of battery
The approach of degree mainly uses high-capacity electrode material, and when battery core designs, improves the surface density and compacted density of pole piece
It is horizontal.
Notification number is that the patent of CN104810506B discloses a kind of lithium ion battery of high-energy density, the lithium-ion electric
Pole piece in pond is first on a current collector by anode sizing agent or negative electrode slurry coating, then close according to certain compacting when making
Degree is rolled, then through cutting, punching, prepares the positive and negative plate of required size.Currently, the design compacting of lithium ion battery is close
Spend higher and higher, in actual production practice, the pole piece prepared using the above method, the phenomenon that lug fold is serious, and production is disconnected
The problem of band, frequently occurs.Existing pole piece preparation method, has been unable to meet the production requirement of lithium ion battery with high energy density.
Invention content
The purpose of the present invention is to provide a kind of preparation methods of pole piece, to solve lug fold existing for existing method
Phenomenon is serious, produces the problem of frequent broken belt.
To achieve the above object, the technical solution adopted in the present invention is：
A kind of preparation method of pole piece, includes the following steps：
1) electrode slurry is coated in collection liquid surface, coating area and the areas Kong Bo is formed in collection liquid surface after drying；
2) part excision is carried out to the collector in the areas Kong Bo, then carries out roll-in film-making.
In existing pole piece preparation method, lug fold, production broken belt the reason of be, in the effect of roll-in and tractive force
Under, there is difference in the extensible extent of coating area collector and the extensible extent of the areas Kong Bo collector, and then cause the areas Kong Bo and coating area
Juncture area generate fold or broken belt, the present invention provides the preparation method of pole piece, and the collector in the areas Xian Duikongbo carries out part
Excision, then carries out roll operation, wherein the part collector in the areas excision Kong Bo in advance, can mitigate, disperse the afflux in the areas Kong Bo
The stress that body is subject in roll-in and distraction procedure, and then reduce and generate fold in the juncture area of the areas Kong Bo and coating area
Power improves fold, belt phenomenon of the pole piece in preparation process, improves the production quality of pole piece.
In step 2), the part excision is to be cut the collector in the areas Kong Bo to form lug.By in roll-in
It is preceding that the areas Kong Bo are cut according to lug design parameter, pole piece can be completed through roll-in film-making and prepare, it in this way can be in not shadow
Under the premise of the preparation efficiency for ringing pole piece, high degree improves lug and juncture area buckling phenomena, improves pole piece quality.
The present invention method mainly on collector length direction only have a coating area situation, in the situation
Under, the areas Kong Bo are located at the one or both sides of coating area.For the pole band with a plurality of coating area, it can cut into and be coated with single
The pole band in area is operated according still further to the method for the present invention.The areas Kong Bo can be located at the one or both sides of coating area, for being provided only with
The situation in the unilateral areas Kong Bo, in the length in the areas Kong Bo, interval cuts out lug, the collector portion being removed between lug
Point, it can be substantially reduced in nipping process, the extensible extent difference in the areas Kong Bo and coating area collector, and then the fold for improving pole piece is asked
Topic.
Preferably, the areas Kong Bo are located at the both sides of coating area, cut being formed in collector respectively to the areas Kong Bo of both sides
Interlock spaced lug unit in coating area both sides on length direction, the lug unit includes at least one lug.It is logical
It crosses and lug is staggeredly spaced setting in the both sides of coating area, in nipping process, roll-in, traction stresses can freely be released to both sides
It puts, can more preferably balance, the power for the generation fold that dissipates avoids pole piece broken belt so as to be further reduced the generation of fold.
It is further preferred that the lug is the trapezoidal of outer narrow inner width.Lug is designed to trapezium structure, lug can be made to exist
Power that nipping process is subject to is more balanced, mitigates, to the dissipation best results of fold.When cutting, can further lug with
The bonding station of collector opens up chamfering, to reduce stress concentration.
Pole piece can be used for making various forms of battery cores made from the preparation method of the present invention.Making lamination type electric core
When, in the following ways：The quantity of lug is one in the lug unit, length direction of multiple lug units along collector
Spaced set forms laminated battery plate pole piece after roll-in film-making.Roll-in film-making includes that roll-in, slice, deburring etc. are conventional
Step.
When making takeup type battery core, carried out according to following scheme：The lug is located in the areas Kong Bo of coating area side,
Multiple lugs form coiled battery pole piece along the non-spaced set of length direction of collector after roll-in film-making.Roll-in
Film-making is that the routine operations such as deburring are carried out after roll-in.
The pole piece is positive plate or negative plate.It is readily appreciated that, method of the invention can be used for preparing positive plate or cathode
The phenomenon that piece, the areas lug fold Huo Kongbo, coating area fold occurs in the pole piece prepared using this method, is substantially reduced or disappears, pleat
The degree of wrinkle is in controlled range, it is possible thereby to improve the molding consistency and quality of pole piece, and then improves lithium ion battery
Quality.
Description of the drawings
Fig. 1 is the position view that pole takes coating area and the areas Kong Bo；
Fig. 2 shows the schematic diagrames that lug is cut and formed to pole band；
Fig. 3 is the structural schematic diagram of final molding pole piece.
Specific implementation mode
Embodiments of the present invention are described further below in conjunction with the accompanying drawings.
The specific embodiment of the preparation method of the pole piece of the present invention, using following steps：
1) by electrode slurry coating on a current collector, middle part be coated with electrode slurry region drying after formed coating area and
The width in the areas Kong Bo positioned at coating area both sides, the both sides areas Kong Bo is equal, and the width in the areas Qie Kongbo is less than the width of coating area；
2) areas Kong Bo of both sides are die cut respectively by lug design parameter, are formed on collector length direction and are applying
It covers area both sides to interlock spaced lug unit, the quantity of lug is one in the lug unit；Lug is outer narrow inner width
Trapezium structure, the bonding station of lug and collector offers chamfering, and multiple lugs are equally arranged；
3) the pole band after being die cut to step 2) continues through roll squeezer compacting, is formed after then carrying out hardware or laser dicing
Laminated battery plate molding pole piece.
Step 1) is that electrode slurry is coated to the process on collector, the position view of the coating area and the areas Kong Bo of formation
As shown in Figure 1, including the areas Kong Bo 2 positioned at the coating area 1 at middle part and positioned at 1 both sides of coating area.The specific choice of electrode slurry
There is no limit, such as can according to mass ratio by 85%~95% positive active material, 5%~10% conductive agent and 2%~
10% binder is dissolved in N-Methyl pyrrolidone solvent, is -0.07~-0.08Mpa, mixing speed 1000 in vacuum degree
Under conditions of~3500rpm, 10~15h is stirred, mixture is obtained, mixture is sieved, control sieve specification is 160 mesh, warp
Secondary filtration, you can prepare anode sizing agent.In mixing process, the temperature for controlling slurry is not higher than 40 DEG C, and drop temperature control exists
23±5℃。
It can be according to mass ratio by 85%~95% negative electrode active material, 5%~10% conductive agent and 2%~10%
Binder be dissolved in N-Methyl pyrrolidone solvent, vacuum degree be -0.07~-0.08Mpa, mixing speed be 1000~
Under conditions of 3000rpm, 12~18h is stirred, mixture is obtained, mixture is sieved, control sieve specification is 100 mesh, through two
Grade filtering, you can prepare negative electrode slurry.
By anode sizing agent with the speed of 5~8m/min coated on 15~20 μm of aluminium foil, negative electrode slurry is with 5~8m/min
Speed coated on 10~15 μm of copper foil, you can be correspondingly formed positive pole band, cathode pole band.
Step 2) is die cut by lug design parameter to positive pole band, cathode pole band, to form positive pole ear, cathode
Lug, in Fig. 2, lug 3 is arranged alternately in the areas Kong Bo positioned at both sides.In embodiment, the width for controlling anode pole piece is
141 ± 0.5mm, the following size of lug are 47 ± 0.5mm, and the height of lug is 27 ± 0.5mm, space D 1 between lug,
D2, D4, D5, D6, D7 ... Dn-1, Dn are 133.63mm, then the roll-in through step 3), slicing step are to get as shown in Figure 3
Molding pole piece, molding pole piece has coating area 1, the areas Kong Bo 2 and lug 3 in Fig. 3.
In the other embodiment of the preparation method of the pole piece of the present invention, can the areas Kong Bo be set in the side of coating area, so
It is die cut out lug by non-equidistant mode in the areas Hou Kongbo, prepares takeup type battery core pole piece.Lug unit may include one
Above lug, in the areas Kong Bo of both sides, lug quantity is in 1,2,2,1 ... non-rule distribution；The shape of lug is not limited to
It is trapezoidal, can be rectangle or square structure, the comparable effect of availability.
Claims (7)
1. a kind of preparation method of pole piece, which is characterized in that include the following steps：
1) electrode slurry is coated in collection liquid surface, coating area and the areas Kong Bo is formed in collection liquid surface after drying；
2) part excision is carried out to the collector in the areas Kong Bo, then carries out roll-in film-making.
2. the preparation method of pole piece as described in claim 1, which is characterized in that in step 2), the part excision is to sky
The collector in foil area is cut to form lug.
3. the preparation method of pole piece as claimed in claim 2, which is characterized in that the areas Kong Bo are located at the both sides of coating area, to two
The areas Ce Kongbo carry out cutting respectively being formed on collector length direction to interlock spaced lug list in coating area both sides
Member, the lug unit include at least one lug.
4. the preparation method of pole piece as claimed in claim 3, which is characterized in that the quantity of lug is one in the lug unit
A, multiple lug units form laminated battery plate pole along the length direction spaced set of collector after roll-in film-making
Piece.
5. the preparation method of pole piece as claimed in claim 2, which is characterized in that the lug is located at the empty foil of coating area side
Qu Shang, multiple lugs form coiled battery pole along the non-spaced set of length direction of collector after roll-in film-making
Piece.
6. such as the preparation method of claim 2~5 any one of them pole piece, which is characterized in that the lug is outer narrow inner width
It is trapezoidal.
7. the preparation method of pole piece as claimed in claim 6, which is characterized in that the pole piece is positive plate or negative plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810058876.XA CN108400281A (en) | 2018-01-22 | 2018-01-22 | A kind of preparation method of pole piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810058876.XA CN108400281A (en) | 2018-01-22 | 2018-01-22 | A kind of preparation method of pole piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108400281A true CN108400281A (en) | 2018-08-14 |
Family
ID=63094040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810058876.XA Pending CN108400281A (en) | 2018-01-22 | 2018-01-22 | A kind of preparation method of pole piece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108400281A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380008A (en) * | 2019-08-09 | 2019-10-25 | 江西星盈科技有限公司 | Electrodes of lithium-ion batteries die-cutting process and die-cutting device |
| CN111477833A (en) * | 2020-04-10 | 2020-07-31 | 孚能科技(赣州)股份有限公司 | Lithium ion battery pole piece and laser cutting and manufacturing method thereof |
| EP3736884A4 (en) * | 2019-03-26 | 2021-03-10 | Ningde Amperex Technology Ltd. | Pole piece, battery cell and battery |
| CN112635704A (en) * | 2020-12-28 | 2021-04-09 | 蜂巢能源科技有限公司 | Pole piece and pole piece coating method |
| CN112776391A (en) * | 2020-12-18 | 2021-05-11 | 蜂巢能源科技有限公司 | Processing device and processing method for rolling and wrinkle removing of pole piece |
| CN113451540A (en) * | 2021-08-12 | 2021-09-28 | 上海兰钧新能源科技有限公司 | Pole piece rolling method |
| CN114535934A (en) * | 2022-02-23 | 2022-05-27 | 上海兰钧新能源科技有限公司 | Pole piece rolling method and pole piece |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3736884A4 (en) * | 2019-03-26 | 2021-03-10 | Ningde Amperex Technology Ltd. | Pole piece, battery cell and battery |
| US11888123B2 (en) | 2019-03-26 | 2024-01-30 | Ningde Amperex Technology Ltd. | Electrode plate, battery cell, and battery |
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| CN111477833A (en) * | 2020-04-10 | 2020-07-31 | 孚能科技(赣州)股份有限公司 | Lithium ion battery pole piece and laser cutting and manufacturing method thereof |
| CN112776391A (en) * | 2020-12-18 | 2021-05-11 | 蜂巢能源科技有限公司 | Processing device and processing method for rolling and wrinkle removing of pole piece |
| CN112635704A (en) * | 2020-12-28 | 2021-04-09 | 蜂巢能源科技有限公司 | Pole piece and pole piece coating method |
| CN113451540A (en) * | 2021-08-12 | 2021-09-28 | 上海兰钧新能源科技有限公司 | Pole piece rolling method |
| CN114535934A (en) * | 2022-02-23 | 2022-05-27 | 上海兰钧新能源科技有限公司 | Pole piece rolling method and pole piece |
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Application publication date: 20180814 |