CN116666554A - Pole piece, preparation method and application thereof, and pole piece preparation system - Google Patents

Pole piece, preparation method and application thereof, and pole piece preparation system Download PDF

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Publication number
CN116666554A
CN116666554A CN202310710037.2A CN202310710037A CN116666554A CN 116666554 A CN116666554 A CN 116666554A CN 202310710037 A CN202310710037 A CN 202310710037A CN 116666554 A CN116666554 A CN 116666554A
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CN
China
Prior art keywords
pole piece
tab
welding
foil area
active coating
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Pending
Application number
CN202310710037.2A
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Chinese (zh)
Inventor
侯杰杰
纪荣进
李聪
王诗龙
陈杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Liwei Energy Technology Co ltd
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Zhejiang Liwei Energy Technology Co ltd
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Publication date
Application filed by Zhejiang Liwei Energy Technology Co ltd filed Critical Zhejiang Liwei Energy Technology Co ltd
Priority to CN202310710037.2A priority Critical patent/CN116666554A/en
Publication of CN116666554A publication Critical patent/CN116666554A/en
Pending legal-status Critical Current

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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
    • 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
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention discloses a pole piece, a preparation method and application thereof, and a pole piece preparation system, and belongs to the technical field of battery materials. The pole piece provided by the invention comprises: a current collector having an a-side and a B-side; a reactive coating layer disposed on at least one side surface of the current collector; the electrode lug welding empty foil area is arranged on the A surface of the current collector, and an active coating is arranged at the position of the B surface opposite to the electrode lug welding empty foil area; and the electrode lug is welded on the electrode lug welding empty foil area. The pole piece provided by the invention realizes single-sided welding of the pole lug, and improves the safety and energy density of the secondary battery comprising the pole piece. The invention also provides a preparation method and application of the pole piece and a pole piece preparation system for preparing the pole piece.

Description

Pole piece, preparation method and application thereof, and pole piece preparation system
Technical Field
The invention relates to the technical field of battery materials, in particular to a pole piece, a preparation method and application thereof, and a pole piece preparation system.
Background
In the production of secondary batteries, such as lithium ion batteries, it is necessary to connect the battery cell with the external electricity by tabs; the tab is welded at the empty foil of the pole piece. In order to avoid the cold joint or the performance influence of the welding process on the pole piece coating, the coating cannot be arranged on two sides of the pole piece at the welding position of the pole lug.
Further, the setting method of the empty foil position comprises the modes of cleaning, scraping or coating foaming glue in advance. The arrangement of the empty foil position can be simultaneously arranged with the coating, and then the pole piece is cut; or can be performed after the coating is arranged and the pole piece is cut.
In summary, in general, the tab is welded only on one side (a face) of the pole piece, but an empty foil is left on the other side (B face) of the corresponding position, so that energy cannot be contributed by the empty foil on the B face, and an adhesive tape is also required to be attached to prevent lithium precipitation. This results in material waste and ED (energy density) losses.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the pole piece, single-sided welding of the pole lug is realized, and the safety and the energy density of the secondary battery comprising the pole piece are improved.
The invention also provides a preparation method of the pole piece.
The invention also provides a pole piece preparation system for implementing the preparation method.
The invention also provides a secondary battery comprising the pole piece.
According to an embodiment of the first aspect of the present invention, there is provided a pole piece comprising:
a current collector having an a-side and a B-side;
the active coating is arranged on at least one side surface of the current collector;
the electrode lug welding empty foil area is arranged on the A surface of the current collector, and the active coating is arranged at the position of the B surface opposite to the electrode lug welding empty foil area;
and the tab is welded with the tab welding empty foil area.
The pole piece provided by the embodiment of the invention has at least the following beneficial effects:
the traditional pole piece is usually welded on two sides, namely the combination position of the lug and the current collector, and the surfaces of the front side and the back side of the current collector are hollow foils and are not coated with active coatings. This results in the need to attach a piece of gummed paper to the surface of the tab that is not attached after the tab is welded. And lithium is easy to be separated out at the place where the gummed paper is attached, so that potential safety hazards are caused. Further, since the side surface (corresponding position) to which the tab is not attached is a blank foil region, this position does not contribute to energy but occupies volume and mass, thereby lowering energy density.
In the pole piece provided by the invention, the active coating is still arranged at the opposite position of the welding empty foil area of the pole lug, so that compared with the traditional pole piece, the energy density is improved. Meanwhile, due to the arrangement of the structure, the adhesive paper is not needed to be adhered to the corresponding position of the B surface, so that the risk of lithium precipitation around the adhesive paper is reduced, the energy density reduction caused by the adhesive paper is avoided, and the preparation flow of the pole piece is saved.
In conclusion, the pole piece provided by the invention improves the safety performance and the energy density and simultaneously saves the preparation flow through the structural arrangement.
According to some embodiments of the invention, the tab welding empty foil area is arranged in a groove formed around the active coating. That is, only one side edge of the tab weld void foil region is not adjacent to the active coating. Namely, the electrode lug is arranged in the middle of the pole piece, namely, the transmission path of current is shortened, which is beneficial to improving the rate capability of the secondary battery comprising the pole piece.
According to some embodiments of the invention, the tab weld void foil region and the active coating are disposed adjacent. That is, only one side edge of the tab weld blank area is adjacent to the coating. Namely, the electrode lugs are arranged at the end parts of the pole pieces. The pole piece obtained by the method is matched with most battery manufacturing production lines in the current stage, and the preparation method is simpler.
According to some embodiments of the invention, the pole piece is a positive electrode. At this time, the current collector is made of aluminum. The lug is made of aluminum.
According to some embodiments of the invention, the pole piece is a negative electrode. At this time, the current collector is made of copper. The tab is one of a nickel tab, a copper nickel plated tab and a copper nickel composite strip tab.
According to an embodiment of the second aspect of the present invention, there is provided a method for manufacturing the pole piece, the method comprising welding a tab to the tab welding empty foil area by using a single-sided laser welding technology.
The preparation method provided by the embodiment of the invention has at least the following beneficial effects:
in the prior art, the welding of the tab is usually ultrasonic welding, which is limited by an ultrasonic welding process, the front and back surfaces of the welding position of the tab must be blank foils at the same time, and the reserved blank foils have strict alignment requirements. The production efficiency and the high quality rate are lower.
The invention adopts a single-sided laser welding technology, so that only one side of the tab is required to be arranged for welding the empty foil area, thereby improving the production efficiency and the yield.
According to some embodiments of the invention, the method further comprises disposing the active coating prior to welding the tab.
According to some embodiments of the invention, the active coating and the tab weld void foil region are disposed simultaneously.
According to some embodiments of the invention, the active coating is disposed earlier than the tab weld void foil region.
According to some embodiments of the invention, the active coating is disposed later than the tab weld void foil region.
According to some embodiments of the invention, the method for setting the tab welding empty foil area comprises at least one of cleaning, intermittent coating, pre-coating foaming glue and scraping blade. Wherein, the liquid crystal display device comprises a liquid crystal display device,
the cleaning comprises laser cleaning; and cleaning, namely removing the active coating in a corresponding area after the active coating is arranged, so as to form the tab welding empty foil area. The laser cleaning has the advantages of no grinding, no contact, no thermal effect and the like, and has remarkable advantages compared with the traditional cleaning method.
The intermittent coating means that when the active coating is arranged, the position of a scraper is controlled, and the position of the tab welding empty foil area is directly reserved. However, the width of the doctor blade is generally constant, so that this coating method cannot produce a groove-shaped tab welding empty foil region.
The precoating foaming glue is that before the active coating is arranged, the surface of the current collector is provided with foaming glue (the method comprises at least one of coating and attaching), and after the active coating is arranged, the foaming glue is removed, namely, the tab welding empty foil area with various position and shape requirements is formed. The method does not need to regulate the coating condition of the active coating, but needs to carry out the procedure of removing the foaming glue.
The scraping blade is used for scraping the slurry of the preset tab welding empty foil area in the arrangement of the active coating, namely when the coating is completed but not dried.
According to some embodiments of the invention, the method further comprises performing slicing.
According to some embodiments of the invention, the method further comprises performing a rubberizing procedure after the tab welding. Due to the structural design of the pole piece, the rubberizing procedure only needs to carry out the rubberizing paper adhesion of the A face. Greatly saves the preparation process and improves the energy density of the pole piece.
According to some embodiments of the invention, when the pole piece is a positive pole piece, the preparation method comprises the steps of:
s1, setting the active coating, and setting the tab welding empty foil area by adopting at least one of intermittent coating, precoating foaming glue and scraping blade;
s2, cutting the part obtained in the step S1 into a pole piece semi-finished product with a proper size;
s3, welding the tab in a tab welding empty foil area of the pole piece semi-finished product by adopting a single-sided laser welding technology;
s4, rubberizing the welding part of the pole lug of the component obtained in the step S3, and winding.
According to some embodiments of the invention, the detection of the semi-finished pole piece is also included between step S2 and step S3. The items to be tested include the uniformity, thickness of the active coating, and the location of the tab weld void foil area.
Because the binder adopted by the anode is PVDF and the like and is insoluble in water, if the electrode lug welding empty foil area is cleaned and arranged after the active coating is arranged, the problem of incomplete active coating removal can occur, the welding of the subsequent electrode lug is affected, and finally the rate of the pole piece is affected.
According to some embodiments of the invention, in step S2, the suitable size is determined by the size of the secondary battery to which the pole piece is applied, without being strictly limited.
Further, step S2 may also be omitted if the dimensions of the components obtained in step S1 are exactly the same.
According to some embodiments of the invention, when the pole piece is a negative pole piece, the preparation method comprises the steps of:
D1. disposing the active coating on the surface of the current collector;
D2. cutting the part obtained in the step D1 into a semi-finished product of the pole piece with a proper size;
D3. the electrode lug welding empty foil area is arranged on the electrode piece semi-finished product by adopting a cleaning method;
D4. d3, welding the tab in the tab welding empty foil area of the component obtained in the step by adopting a single-sided laser welding technology;
D5. and D4, rubberizing the welding part of the lug of the component obtained in the step D4, and rolling.
According to some embodiments of the invention, the detection of the semi-finished pole piece is also included between step D3 and step D4. The items to be tested include the uniformity, thickness of the active coating, and the location of the tab weld void foil area.
As with the positive electrode, the size in step D2 is not limited, and step D2 may be omitted in actual production.
Since the binder of the negative electrode is mostly an aqueous binder. Therefore, the arrangement of the tab welding empty foil area can be realized through simple water dissolution, and the negative electrode active coating can be thoroughly removed. Whereby the negative electrode is more simply cleaned.
According to an embodiment of the third aspect of the present invention, there is provided a pole piece manufacturing system for implementing the manufacturing method, the pole piece manufacturing system including an active coating setting unit, a tab welding empty foil area setting unit, a single-sided laser welding unit, a slitting unit, and a post-processing unit.
The pole piece preparation system provided by the invention has at least the following beneficial effects:
the pole piece preparation system provided by the invention can obviously improve the production efficiency and the production rate of the pole piece. And the pole piece preparation system only needs to be simply modified (for example, a pole lug welding empty foil area setting unit is additionally arranged and a welding unit is replaced) on the basis of the original system, and large-scale replacement is not needed, so that the cost is saved.
According to some embodiments of the invention, the active coating layer setting unit includes a coater and a dryer which are sequentially disposed.
According to some embodiments of the invention, the tab welding empty foil area setting unit includes at least one of a cleaning unit, a foaming glue coating unit, and a doctor blade unit.
When the method for setting the tab welding empty foil area is intermittent coating, the tab welding empty foil area setting unit is the coating machine.
According to some embodiments of the invention, the post-processing unit comprises a rubberizing component.
According to some embodiments of the invention, the pole piece preparation system further comprises a detection unit.
The units of the pole piece preparation system have no fixed connection relation, and the transfer sequence of materials can be changed according to different pole piece types. For example, the number of the cells to be processed,
when the pole piece is the positive pole, the tab welding empty foil area setting unit and the active coating setting unit are combined for use (hereinafter referred to as a combination unit); the transfer sequence of the materials is a combination unit, a slitting unit, a single-sided laser welding unit and a post-treatment unit.
When the pole piece is a negative electrode, the transfer sequence of the materials comprises an active coating setting unit, a slitting unit, a tab welding empty foil area setting unit, a single-sided laser welding unit and a post-processing unit.
According to an embodiment of the fourth aspect of the present invention, a secondary battery is provided, which includes the electrode tab.
The secondary battery adopts all the technical schemes of the pole piece of the embodiment, so that the secondary battery has at least all the beneficial effects brought by the technical schemes of the embodiment. I.e. with a higher safety and energy density.
According to some embodiments of the invention, the secondary battery includes at least one of a lithium battery, a sodium battery, and a potassium battery.
According to some embodiments of the invention, the lithium battery comprises at least one of a lithium ion battery and a lithium metal battery.
According to some embodiments of the invention, the sodium battery comprises at least one of a sodium ion battery and a sodium metal battery.
According to some embodiments of the invention, the potassium cell comprises at least one of a potassium ion cell and a potassium metal cell.
The term "about" as used herein, unless otherwise specified, means that the tolerance is within + -2%, for example, about 100 is actually 100 + -2%. Times.100.
Unless otherwise specified, the term "between … …" in the present invention includes the present number, for example "between 2 and 3" includes the end values of 2 and 3.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a pole piece according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural view of the a face of the pole piece of fig. 1.
Fig. 3 is a schematic view of the structure of the B face of the pole piece of fig. 1.
Fig. 4 is a schematic structural diagram of a pole piece according to embodiment 2 of the present invention.
Fig. 5 is a schematic view of the structure of the a face of the pole piece of fig. 3.
Fig. 6 is a schematic view of the structure of the B face of the pole piece of fig. 3.
Fig. 7 is a schematic illustration of the pole piece preparation system and material transfer provided in example 5.
Fig. 8 is a schematic illustration of the pole piece preparation system and material transfer provided in example 6.
Reference numerals:
unreeling machine 010, reeling machine 020, middle roller 030 and detecting unit 040;
current collector 100, a side 110, B side 120; a reactive coating 200; the tab welding empty foil area 300; tab 400.
The active coating layer setting unit 500, the coating machine 510, the dryer 520, the tab welding empty foil area setting unit 600, the slitting unit 700, the single-sided laser welding unit 800 and the post-processing unit 900.
Detailed Description
The conception and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
In the description of the present invention, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Example 1
Referring to fig. 1 to 3, the present embodiment provides a pole piece comprising:
a current collector 100, the current collector 100 having an a-side 110 and a B-side 120;
the active coating 200, the active coating 200 is set up on A110 and B120 of the current collector 100;
the tab welding empty foil area 300, the tab welding empty foil area 300 is arranged on the A face 110 of the current collector 100, and the active coating 200 is arranged at the position of the B face 120 opposite to the tab welding empty foil area 300; the tab welding empty foil area 300 and the active coating 200 are adjacently arranged;
tab 400, tab 400 and tab weld blank 300 are welded.
The electrode structure provided in this embodiment can be applied to a positive electrode or a negative electrode.
Example 2
Referring to fig. 4 to 6, the present embodiment provides a pole piece comprising:
a current collector 100, the current collector 100 having an a-side 110 and a B-side 120;
the active coating 200, the active coating 200 is set up on A110 and B120 of the current collector 100;
the tab welding empty foil area 300, the tab welding empty foil area 300 is arranged on the A face 110 of the current collector 100, and the active coating 200 is arranged at the position of the B face 120 opposite to the tab welding empty foil area 300; the tab welding empty foil area 300 is arranged in a groove formed around the active coating 200.
Tab 400, tab 400 and tab weld blank 300 are welded.
The electrode structure provided in this embodiment can be applied to a positive electrode or a negative electrode.
Example 3
The embodiment provides a preparation method of a positive electrode plate, which specifically comprises the following steps:
s1, attaching thermal decomposition foaming glue to a position where a tab welding empty foil area is required to be arranged on a current collector (aluminum foil); then coating positive electrode active coating on the A face and the B face of the current collector by adopting a coating method, and drying;
and (3) invalidating and peeling the pyrolytic foaming adhesive in the drying process, thereby forming a tab welding empty foil area.
S2, cutting the part obtained in the step S1 into a pole piece semi-finished product with a proper size;
s3, detecting whether an active coating and a tab welding empty foil area in the pole piece semi-finished product obtained in the step S2 meet requirements, and welding a tab (aluminum tab) in the tab welding empty foil area if the active coating and the tab welding empty foil area meet the requirements;
s4, rubberizing the welding part of the pole lug of the component obtained in the step S3, and winding.
Example 4
The embodiment provides a preparation method of a negative electrode plate, which specifically comprises the following steps:
D1. a negative electrode active coating is arranged on the surface of a current collector (copper foil);
D2. cutting the part obtained in the step D1 into a semi-finished product of the pole piece with a proper size;
D3. arranging a tab welding empty foil area on a pole piece semi-finished product by adopting a laser cleaning method;
D4. detecting the component in the step D3, and if the component is qualified, adopting a single-sided laser welding technology to weld a tab (nickel tab) in a tab welding empty foil area of the component obtained in the step D3;
D5. and D4, rubberizing the welding part of the lug of the component obtained in the step D4, and rolling.
Example 5
The present embodiment provides a pole piece preparation system for manufacturing the positive pole piece provided in embodiment 3, the pole piece preparation system comprising:
an active coating setting unit 500, a tab welding empty foil area setting unit 600, a single-sided laser welding unit 800, a slitting unit 700, a detecting unit 040 and a post-processing unit 900. Wherein, the liquid crystal display device comprises a liquid crystal display device,
the active coating layer setting unit 500 includes a coater 510 and a dryer 520;
the tab welding empty foil area setting unit 600 includes a foaming adhesive attachment part;
the post-processing unit 900 comprises a rubberizing component.
Each unit includes an unwinder 010 and a wind-up 020 and also includes an intermediate roller 030 provided for smooth passage of the pole pieces.
The material transferring sequence is a foaming adhesive attaching part, a coating machine 510, a dryer 520, a slitting unit 700, a detection unit 040, a single-sided laser welding unit 800 and an adhesive attaching part.
The composition of the pole piece preparation system provided in this example and the material transfer sequence are shown in fig. 7.
Example 6
The present embodiment provides a pole piece preparation system for manufacturing the negative pole piece provided in embodiment 4, the pole piece preparation system comprising:
an active coating setting unit 500, a tab welding empty foil area setting unit 600, a single-sided laser welding unit 800, a slitting unit 700, a detecting unit 040 and a post-processing unit 900. Wherein, the liquid crystal display device comprises a liquid crystal display device,
the active coating layer setting unit 500 includes a coater 510 and a dryer 520;
the tab welding empty foil area setting unit 600 includes a laser cleaner;
the post-processing unit 900 comprises a rubberizing component.
Each unit includes an unwinder 010 and a wind-up 020.
The material transfer sequence is coater 510, dryer 520, slitting unit 700, laser cleaner, detection unit 040, single-sided laser welding unit 800, and rubberizing component.
The composition and material transferring sequence of the pole piece preparation system provided in this embodiment are shown in fig. 8, where the arrow indicates the material flowing direction.
In conclusion, due to the structural design of the pole piece, the preparation flow can be remarkably saved, the safety and the energy density can be improved, and the pole piece production system and the preparation method can remarkably improve the preparation efficiency and the high-quality rate of the pole piece. Further, since the electrode sheet has good performance, the secondary battery including the electrode sheet also has low manufacturing cost, high energy density and high safety; is expected to have wide application in the energy storage field, the power field and the 3C field.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.

Claims (10)

1. A pole piece, the pole piece comprising:
a current collector having an a-side and a B-side;
the active coating is arranged on at least one side surface of the current collector;
the electrode lug welding empty foil area is arranged on the A surface of the current collector, and the active coating is arranged at the position of the B surface opposite to the electrode lug welding empty foil area;
and the tab is welded with the tab welding empty foil area.
2. The pole piece of claim 1, wherein the tab weld void foil area is disposed within a recess formed around the active coating.
3. The pole piece of claim 1, wherein the tab weld void foil region and the active coating are disposed adjacent.
4. A pole piece according to any of claims 1-3, characterized in that the pole piece is a positive electrode; and/or, the pole piece is a negative electrode.
5. A method of manufacturing a pole piece as claimed in any one of claims 1 to 4, comprising welding a tab to the tab weld void foil region using a single sided laser welding technique.
6. The method of manufacturing according to claim 5, wherein the method of disposing the tab welding empty foil area includes at least one of cleaning, intermittent coating, pre-coating a foaming adhesive, and doctor blade.
7. The method of manufacturing according to claim 5 or 6, further comprising providing the active coating layer before the tab welding; and/or, the preparation method further comprises the step of carrying out a rubberizing procedure after the tab is welded.
8. A pole piece preparation system for carrying out the preparation method according to any one of claims 5 to 7, characterized in that the pole piece preparation system comprises an active coating setting unit, a pole lug welding empty foil area setting unit, a single-sided laser welding unit, a slitting unit and a post-processing unit.
9. A secondary battery comprising a pole piece according to any one of claims 1 to 4.
10. The secondary battery according to claim 9, wherein the secondary battery comprises at least one of a lithium battery, a sodium battery, and a potassium battery.
CN202310710037.2A 2023-06-14 2023-06-14 Pole piece, preparation method and application thereof, and pole piece preparation system Pending CN116666554A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310710037.2A CN116666554A (en) 2023-06-14 2023-06-14 Pole piece, preparation method and application thereof, and pole piece preparation system

Applications Claiming Priority (1)

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CN202310710037.2A CN116666554A (en) 2023-06-14 2023-06-14 Pole piece, preparation method and application thereof, and pole piece preparation system

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