CN111384358B - Manufacturing process of battery pole piece - Google Patents
Manufacturing process of battery pole piece Download PDFInfo
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- CN111384358B CN111384358B CN202010217471.3A CN202010217471A CN111384358B CN 111384358 B CN111384358 B CN 111384358B CN 202010217471 A CN202010217471 A CN 202010217471A CN 111384358 B CN111384358 B CN 111384358B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
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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
-
- 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)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Optics & Photonics (AREA)
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- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a manufacturing process of a battery pole piece, which comprises the following specific steps: 1. according to the length of a coating and the length of a gap required by production, a first surface coating of the battery pole piece is manufactured in a gap coating mode; 2. coating the other side of the battery pole piece by adopting a staggered gap, so that both ends of the long side of the coating of the second side are longer than the first side or shorter than the first side, and finishing the manufacture of a pole piece material roll; 3. and (3) carrying out laser cutting on the two sides of the battery pole piece by taking the boundary between the coating on the side with the shorter coating and the foil as a standard, so that only the foil is cut off on the side with the shorter coating, and a cut-off mark is cut on the coating on the other side. This application can effectively improve holistic cutting process efficiency and reduce the laser power who uses, utilizes the clearance coating mode that two sides differ in size to carry out the coating to the pole piece simultaneously, can accomplish the back at the cutting process of this application, forms utmost point ear naturally to under the prerequisite that the material roll does not stop and transports, the pole piece one shot forming of completion.
Description
Technical Field
The invention relates to a manufacturing process technology of a lithium battery pole piece, in particular to a manufacturing process of a battery pole piece.
Background
In the coating process of the lithium battery, gap coating and continuous coating are mainly carried out, wherein the intermittent coating is to coat slurry for manufacturing a lithium battery pole piece on the front and back surfaces of an aluminum foil (positive electrode) and a copper foil (negative electrode) in a gap manner to form a material roll which is finished by coating a coating layer, namely the aluminum foil (copper foil) -the coating layer and the aluminum foil (copper foil) … … in a gap manner; the continuous coating is characterized in that the slurry is continuously coated on the front and back surfaces of an aluminum foil (anode) and a copper foil (cathode), and the aluminum foil (anode) and the copper foil (cathode) with fixed width are reserved on the side surfaces.
The lithium battery forming battery pack has a winding mode and a lamination mode, and because of the requirement on the volume power density of the battery, the conventional power and energy storage batteries both adopt the lamination mode to manufacture a battery core. The laminated sheet needs to be cut into a battery positive plate and a battery negative plate according to the structural requirements of the battery by the coated electrode roll, and the cutting modes of the electrode sheet comprise cutting die cutting, hardware die cutting and laser cutting, wherein the laser cutting is the best cutting mode.
Laser cutting is classified into two types, one is cutting with a material (coating) and the other is cutting without a material (foil).
The cutting speed is high without carrying material (foil) laser cutting; the cutting energy is low; the cutting field is required to be small. In addition, because of the positional deviation of aluminium foil and coating boundary line and the influence of detection sensor response accuracy, can cause the cutting position to produce the discrete type deviation problem, the foil (<1mm) that size length differs will be left to the pole piece afterbody, and in the back way battery manufacturing process, this section foil is very thin and can form certain natural fold for a short time, the perk to produce uncontrollable quality influence to the battery package. In addition, when the deviation is too large, the cutting is easy to the coating, so that the cutting energy is low and the coating is not enough to be cut off, and the pole piece is abnormally connected.
The cutting speed of the strip (coating) is slow; the cutting energy is high; the requirement for a large cutting field is particularly obvious for cutting long-size battery pole pieces under clearance coating, so that the requirement for a laser cutting system is high, and the production efficiency of the battery pole pieces is limited to a great extent.
Meanwhile, as the requirement of the market for the performance of the battery is higher and higher, the high-energy density battery becomes the final development direction, the thickness of the battery pole piece may be required to be increased, and if the traditional mode is adopted, a large amount of resources and time are consumed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a manufacturing process of a battery pole piece. The cutting method is suitable for intermittent coating, namely, the cutting of the aluminum foil between the coating and the coating is completed, and after the cutting is completed, the tabs are formed to form the lithium battery pole piece.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a manufacturing process of a battery pole piece comprises the following specific steps:
s1: according to the length of a coating and the length of a gap required by production, a first surface coating of the battery pole piece is manufactured in a gap coating mode;
s2: coating the other side of the battery pole piece by adopting a staggered gap, so that both ends of the long side of the coating of the second side are longer than the first side or shorter than the first side, and finishing the manufacture of a pole piece material roll;
s3: and (3) carrying out laser cutting on the two sides of the battery pole piece by taking the boundary between the coating on the side with the shorter coating and the foil as a standard, so that only the foil is cut off on the side with the shorter coating, and a cut-off mark is cut on the coating on the other side.
S4: the rotating speed of the front conveying mechanism used for clamping the battery pole piece in the length direction is lower than that of the rear conveying mechanism, the pole pieces are separated and form a gap by utilizing the rotating speed difference of the front conveying mechanism and the rear conveying mechanism, and the detection and collection processes of subsequent stations are facilitated.
Further, in the staggered gap coating in S2, the boundary line between the first surface coating and the foil is sensed by the sensor, the alignment parameter of the other surface coating and the first surface coating is set, and gap coating is also performed, so that both ends of the long side of the second surface coating are longer than or shorter than the first surface coating.
Furthermore, both ends of the long edge of the second surface coating are 0.1-10 mm longer than those of the first surface coating or both ends of the long edge of the second surface coating are 0.1-10 mm shorter than those of the first surface coating.
Further, the laser cutting head in S3 is disposed between the front conveying mechanism and the rear conveying mechanism, and the boundary line is recognized by the sensor to trigger the laser to cut.
Further, in the step S4, the rotating speed of the front conveying mechanism is 0.1-20 mm/S lower than that of the rear conveying mechanism. Compared with the prior art, the invention has the following advantages:
through the thickness that reduces the cutting of needs area material and adopt area material cutting and do not take the mode that material cutting both combined together to carry out battery pole piece cutting process, effectively improve holistic cutting process efficiency and reduce the laser power who uses, utilize the clearance coating mode of two sides different in size to carry out the coating to the pole piece simultaneously, can accomplish the back at the cutting technology of this application, form utmost point ear naturally, thereby under the prerequisite that the material book does not stop and transports, the pole piece one shot forming of completion, and can cut out arbitrary utmost point ear figure according to customer's actual need.
The laser fly-cutting equipment is mainly developed by aiming at improving the energy density of the lithium battery and adopting the requirement research and development of a gradient thick electrode. Meanwhile, the essential unsafe factors such as burrs at the cut of the die-cut foil, falling block and fracture of the thick electrode and the like are overcome. The intermittent coating is the premise of carrying out laser fly-cutting of the positive plate, and the laser fly-cutting can also directly form a passivation layer in the processing process of the active new metal aluminum, so that the pollution to the electrolyte is reduced.
Drawings
FIG. 1 is a schematic view of a structure of a battery pole piece with gap coating of a manufacturing process of the battery pole piece;
FIG. 2 is a schematic structural diagram of a battery pole piece after cutting;
FIG. 3 is a schematic structural diagram of a process for manufacturing a battery electrode sheet;
description of reference numerals: 1. coating; 11. a tab; 2. a foil material; 3. a front transport mechanism; 4. a rear transport mechanism; 5. and (6) pole pieces.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Examples
A manufacturing process of a battery pole piece comprises the following specific steps:
s1: according to the length of a coating and the length of a gap required by production, a first surface coating of the battery pole piece is manufactured in a gap coating mode;
s2: coating the other side of the battery pole piece by adopting a staggered gap, so that both ends of the long side of the coating of the second side are longer than the first side or shorter than the first side, and finishing the manufacture of a pole piece material roll;
s3: and (3) carrying out laser cutting on the two sides of the battery pole piece by taking the boundary between the coating on the side with the shorter coating and the foil as a standard, so that only the foil is cut off on the side with the shorter coating, and a cut-off mark is cut on the coating on the other side.
S4: the rotating speed of the front conveying mechanism used for clamping the battery pole piece in the length direction is lower than that of the rear conveying mechanism, the pole pieces are separated and form a gap by utilizing the rotating speed difference of the front conveying mechanism and the rear conveying mechanism, and the detection and collection processes of subsequent stations are facilitated.
In S1, specifically, the battery pole piece 5 is manufactured by an extrusion die head, first, the first surface coating 1 of the battery pole piece 5 is manufactured according to the required length of the coating 1 and the required gap length by a gap coating method, and the coater uses a gap valve mechanism and a PLC control system, and controls intermittent coating in a control mode of backflow and feeding in a linkage manner, so as to ensure the accuracy of the coating 1 and the gap length during gap coating.
In S2, specifically, the one side coated in S1 is the front side and the other side is the back side, gap coating is continued on the back side of the battery pole piece 5, at this time, the offset gap coating is adopted, the boundary between the coating on the front side and the foil is sensed through a sensor, the alignment degree parameter between the coating on the back side and the coating on the front side is set, and gap coating is also performed, so that both ends of the long side of the coating on the back side are 0.1-10 mm longer or shorter than the coating on the front side. In this embodiment, the opposite side of the coating has longer ends than the front side, as shown in FIG. 1. Note: in the figure black represents the coating 1 and white represents the foil 2.
In S3, specifically, an optical fiber sensor (or a color scale sensor) on the laser cutting machine is used to detect a boundary between the white color of the foil 2 and the black color of the coating 1, and the position is used as a detection reference point, and the length L of each pole piece 5 can be accurately calculated by triggering the white color of each sensor to the black color, and then the front conveying mechanism 3 and the rear conveying mechanism 4 on the front and rear sides of the laser cutting machine pull the material strip of the battery pole piece 5 to advance L, and after the length L of the material strip advances, the laser system is triggered to cut the tab 11 to complete one-step forming, so as to produce a single battery pole piece 5, as shown in fig. 2, and the production of each single battery pole piece 5 is completed by this.
Because the length of the back side coating 1 is 0.1-10 mm longer than that of the front side coating 1, the laser energy is required to meet the requirement that the front side cuts the foil 2, and the back side can cut off the coating 1. Simultaneously because of the cutting positional deviation that PLC control system error produced is less than 2mm, so 5 afterbody of battery pole piece do not have the part that produces the positive and negative and all be foil 2 and produce, consequently increased the afterbody support strength of sola battery pole piece 5 to avoided the 5 afterbody of battery pole piece to be easy fold under the condition of foil 2, the condition of perk takes place, stopped because of 5 afterbody folds of battery pole piece, the battery package that produces under the perk probably brings uncontrollable quality risk.
As shown in fig. 3, in S4, after the battery pole piece is cut, the front conveying mechanism 3 and the rear conveying mechanism 4 are used to quickly transfer the cut battery pole piece 5 to the next station, and the cut battery pole piece 5 is separated from the next battery pole piece 5 by a certain distance, which is convenient for the detection and collection of the subsequent station. The rotating speeds of the front conveying mechanism 3 and the rear conveying mechanism 4 are different to a certain degree, the rotating speed of the rear conveying mechanism 4 is 0.1-20 mm/s higher than that of the front conveying mechanism 3, and the reason for setting the rotating speed difference is that when the battery pole piece 5 is cut, the tensioning is realized through the speed difference formed by the two transmission mechanisms and the pressure of the upper roller on the material belt, the tensioning force is enough to straighten the material belt through good system parameter configuration and optimization, the cut battery pole piece 5 and the battery pole piece 5 which is not cut are not excessively pulled, so that when the stress release after the cutting is realized, the burrs at the fracture part of the cut battery pole piece 5 and the battery pole piece 5 which is not cut are too large, and simultaneously, the battery pole piece 5 can be rapidly transmitted to the next station after the cutting and is separated from the next battery pole piece 5 by a certain distance, the detection and collection of the subsequent stations are facilitated.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (5)
1. A manufacturing process of a battery pole piece is characterized by comprising the following steps:
s1: according to the length of a coating and the length of a gap required by production, a first surface coating of the battery pole piece is manufactured in a gap coating mode;
s2: coating the other side of the battery pole piece by adopting a staggered gap, so that both ends of the long side of the coating of the second side are longer than the coating of the first side or shorter than the first side, and finishing the manufacture of the pole piece material roll;
s3: the method comprises the following steps of simultaneously carrying out pole piece laser cutting on two sides of a battery pole piece by taking a boundary between a coating on one side with a shorter coating and a foil as a standard, so that only the foil is cut off on the side with the shorter coating, and a cut-off mark is cut on the coating on the other side;
s4: the rotating speed of the front conveying mechanism used for clamping the battery pole piece in the length direction is lower than that of the rear conveying mechanism, the pole pieces are separated and form a gap by utilizing the rotating speed difference of the front conveying mechanism and the rear conveying mechanism, and the detection and collection processes of subsequent stations are facilitated.
2. The manufacturing process of the battery pole piece according to claim 1, characterized in that: the staggered gap coating in the S2 is to sense a boundary line between the first surface coating and the foil through a sensor, set an alignment degree parameter of the other surface coating and the first surface coating, and perform gap coating in the same way, so that two ends of the long edge of the second surface coating are longer than the first surface coating or shorter than the first surface coating.
3. The manufacturing process of the battery pole piece according to claim 2, characterized in that: both ends on the long side of the second surface coating are 0.1-10 mm longer than the first surface coating or both ends on the long side of the second surface coating are 0.1-10 mm shorter than the first surface coating.
4. The manufacturing process of the battery pole piece according to claim 1, characterized in that: the laser cutting head in the step S3 is arranged between the front conveying mechanism and the rear conveying mechanism, and the boundary is identified by the sensor to trigger the laser to cut.
5. The manufacturing process of the battery pole piece according to claim 1, characterized in that: in the step S4, the rotating speed of the front conveying mechanism is 0.1-20 mm/S lower than that of the rear conveying mechanism.
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108672244A (en) * | 2018-07-26 | 2018-10-19 | 东莞阿李自动化股份有限公司 | A kind of gap coating method |
| CN113516564B (en) * | 2021-07-30 | 2024-06-11 | 广东利元亨智能装备股份有限公司 | Material roll detection method and device, electronic equipment and storage medium |
| CN114273341B (en) * | 2021-12-13 | 2022-09-30 | 深圳市凌云视迅科技有限责任公司 | Pole piece double-face cleaning and positioning method and device |
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