CN114695832A - Preparation method of pole piece and preparation method of battery - Google Patents

Preparation method of pole piece and preparation method of battery Download PDF

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Publication number
CN114695832A
CN114695832A CN202011623882.9A CN202011623882A CN114695832A CN 114695832 A CN114695832 A CN 114695832A CN 202011623882 A CN202011623882 A CN 202011623882A CN 114695832 A CN114695832 A CN 114695832A
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China
Prior art keywords
pole piece
active material
current collector
preparation
battery
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CN202011623882.9A
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Chinese (zh)
Inventor
廖栋梁
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Shenzhen Xinda New Energy Technology Co ltd
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Shenzhen Xinda New Energy Technology Co ltd
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Priority to CN202011623882.9A priority Critical patent/CN114695832A/en
Priority to PCT/CN2021/139654 priority patent/WO2022143260A1/en
Publication of CN114695832A publication Critical patent/CN114695832A/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
    • H01M4/04—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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • H01M4/70—Carriers or collectors characterised by shape or form
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention discloses a preparation method of a pole piece, which relates to the technical field of batteries, wherein the pole piece comprises a current collector, a connecting belt and an active material layer; the preparation method of the pole piece comprises the following steps: (1) coating or spraying an active material on a current collector; (2) removing the active material on the blank area of the current collector before drying, and then carrying out rolling after drying, or removing the active material on the blank area of the current collector after drying, and then carrying out rolling; (3) and cutting the rolled current collector to form a connecting band, thus obtaining the pole piece. The invention also provides a preparation method of the battery. The invention has the beneficial effects that: the pole piece with short active material length and short blank space can be efficiently prepared; the active material can be uniformly loaded on the current collector, so that the prepared battery has good electrochemical performance; active materials at unnecessary positions can be conveniently recovered, so that the cost is reduced and the environment is protected; the prepared battery has excellent flexibility and safety performance.

Description

Preparation method of pole piece and preparation method of battery
Technical Field
The invention relates to the technical field of batteries, in particular to a preparation method of a pole piece and a preparation method of a battery.
Background
With the development of society, the portable electronic device brings great convenience in human life, and particularly with the popularization of wearable electronic devices, human life becomes more and more intelligent. For example, the noise reduction earphone can lead people to shield complex external noise and concentrate on doing things and enjoying high-quality music; for example, a massager may alleviate fatigue; the prepared clothes, the intelligent watch and the bracelet can detect the body health data of people at any time, and in addition, the intelligent clothes can be used for warming people in winter and cooling people in summer. The new energy automobile reduces the use of fossil energy and brings convenience to the life of people.
But the shortcoming of energy storage device among the prior art lies in can not buckling for the standby time of intelligent wrist-watch, bracelet and earphone is short. At present, there are methods for improving the flexibility of a battery in the prior art, for example, patent application publication No. CN112002933A discloses a method for manufacturing a flexible battery pack and a flexible battery pack manufactured by the same, and the method for manufacturing a battery is improved to obtain a flexible battery pack, but the flexible battery pack is complicated in manufacturing process and high in cost after mass production.
The patent with publication number CN103378344A discloses a battery pole piece and a preparation method thereof, which can inhibit the over-discharge of the battery and simultaneously improve the over-charging capability of the battery, thereby greatly improving the cycle life of the battery under the conditions of over-charging and over-discharging, but the pole piece obtained by the preparation method of the pole piece in the prior art can not improve the bending performance and safety performance of the pole piece.
Disclosure of Invention
The technical problems to be solved by the invention are that the pole piece prepared by the preparation method of the pole piece in the prior art has poor bending performance and safety performance, and the pole lugs can only be placed at two ends of the pole piece.
The invention solves the technical problems through the following technical means:
a preparation method of a pole piece comprises the steps of preparing a current collector, a connecting belt and an active material layer; the number of the current collectors is more than two, and the connecting band is positioned between the adjacent current collectors;
the current collector is provided with a blank area and a material covering area, the blank area is positioned at the end part of the current collector and is connected with the connecting belt, and the active material layer is positioned in the material covering area;
the preparation method of the pole piece comprises the following steps:
(1) coating or spraying an active material on a current collector;
(2) removing the active materials on the connecting band and the blank areas of the plurality of current collectors before drying, and then carrying out rolling after drying, or removing the blank areas of the current collectors and the active materials on the connecting band after drying, and then carrying out rolling to obtain a pole piece;
(3) when the active material is a negative active material, the obtained pole piece is a negative pole piece; when the active material is a positive electrode active material, the obtained pole piece is a positive pole piece.
Has the beneficial effects that: when the pole piece is bent, the connecting belt is easy to bend, but the active material loaded on the connecting belt is removed, so that the bending performance and the safety performance of the pole piece can be improved.
By adopting the preparation method, the pole piece with short active material length (the length of the active material loaded on each time) and short blank space (the distance between two sections of active materials loaded on the current collector) can be efficiently prepared;
the active material can be uniformly loaded on the current collector, so that the prepared battery has good electrochemical performance; active materials at unnecessary positions can be conveniently recovered, so that the cost is reduced and the environment is protected;
the battery prepared by the method is not easy to have the phenomena of short circuit, burr and the like, and the prepared battery has excellent flexibility and safety performance. And the cost of the spraying method is lower than that of the coating method.
The blank area that the mass flow body surface was reserved does not load active material layer, and this blank area is connected with the connecting band, can protect the active material layer of marginal portion when the pole piece encapsulation not destroyed, does not destroy the active material of edge when the battery is buckled, promotes the security of battery simultaneously, makes the battery can not take place the short circuit when buckling.
The pole piece can weld the pole ear on the blank area of the current collector directly, can reduce the integral internal resistance of the battery, and improves the charge and discharge performance and capacity of the battery.
Preferably, the connecting strip is cut.
Preferably, the dried current collector is put into an organic solvent, and then the active material on the blank area of the current collector is erased.
Has the advantages that: the active material loading is efficiently completed on the current collector; the preparation of the pole piece with short active material length and short blank space can be completed with low cost; the required pole piece can be rapidly prepared, the preparation time and cost of the battery are reduced, and the preparation method has the advantage of short period particularly when small-batch products are prepared.
Preferably, the organic solvent comprises acetone, methanol or ethanol.
Preferably, the active material is a positive electrode active material or a negative electrode active material.
Preferably, the method for preparing the positive active material includes the steps of: the positive electrode material, the binder, the conductive agent, and the solvent are mixed.
Preferably, the method for preparing the anode active material includes the steps of: mixing the negative electrode material, the binder, the conductive agent and the solvent.
Preferably, the positive electrode material includes lithium iron phosphate (LFP), Lithium Cobaltate (LCO), Lithium Manganate (LMO), lithium nickel manganate, ternary positive electrode material of Nickel Cobalt Manganese (NCM), ternary positive electrode material of Nickel Cobalt Aluminum (NCA), lithium-rich layered material, ni (oh)2NiO (OH).
Preferably, the negative electrode material comprises one or more of artificial graphite, natural graphite, mesocarbon microbeads, a carbon-silicon negative electrode, lithium titanate, hydrogen storage alloy, cadmium oxide powder and zinc sheets.
Preferably, the binder comprises one or more of polyvinylidene fluoride (PVDF), polyethylene oxide (PEO), Styrene Butadiene Rubber (SBR), sodium carboxymethylcellulose (CMC-Na), Polytetrafluoroethylene (PTFE), Hydroxypropylmethylcellulose (HPMC).
Preferably, the conductive agent includes one or more of Carbon Nanotubes (CNTs), carbon black (SP), graphite powder, carbon nanofibers, graphene, and nickel powder.
Preferably, the number of the current collectors is two, and the blank area and the material covering area are respectively located at two ends of the current collector.
Preferably, the current collector covers the one end in material district and is equipped with and is used for utmost point ear welded to leave white district, it is located the both ends that cover the material district respectively to leave white district and blank area.
Has the advantages that: by adopting the preparation method, an effective blank area is conveniently reserved on the current collector, and tab welding is convenient.
Preferably, the number of the current collectors is greater than two, and the plurality of current collectors are distributed in an array.
Has the advantages that: can realize bending and folding in multiple directions, and is particularly suitable for intelligent clothes.
Preferably, the number of the current collectors is four, and the four current collectors are distributed in two rows and two columns.
Preferably, the number of the current collectors is twenty, and the twenty current collectors are distributed in four rows and five columns.
Preferably, the shape of the current collector is square, circular, triangular, diamond-shaped or trapezoidal.
Preferably, the number of the connecting bands is multiple.
Preferably, the connecting band is polygonal or any side of the connecting band is arc-shaped.
Preferably, the connecting band is in a shape of a square, a trapezoid, a diamond, a convex polygon or a concave polygon.
Preferably, after the connecting belt is cut, a through hole is formed in the connecting belt.
Preferably, the number of the through holes is multiple.
Preferably, the number of the through holes is two, three or more than four.
Preferably, the through holes are circular, square, diamond, triangular or trapezoidal.
Has the advantages that: the through hole is formed in the connecting band, so that the connecting band is suitable for watchbands of watches or other electronic products, and the length of the watchband can be conveniently adjusted according to the shape of the watchband.
The invention also provides a preparation method of the battery, which comprises the following steps:
(1) respectively obtaining a positive pole piece and a negative pole piece by adopting the preparation method of the pole piece of claim 1, welding a positive pole lug on the positive pole piece, and welding a negative pole lug on the negative pole piece;
(2) then winding the positive pole piece, the diaphragm and the negative pole piece in sequence to form a winding core or laminating to form a laminated core;
(3) and injecting electrolyte into the winding core or the stacked core, and packaging to obtain the battery.
Has the advantages that: the battery prepared by the invention has high energy density and good flexibility. The pole piece can weld the pole ear on the blank area of the current collector directly, can reduce the integral internal resistance of the battery, and improves the charge and discharge performance and capacity of the battery.
Preferably, the electrolyte is a solid electrolyte or a liquid electrolyte.
The invention has the advantages that: when the pole piece is bent, the connecting belt is easy to bend, but the active material loaded on the connecting belt is removed, so that the bending performance and the safety performance of the pole piece can be improved.
By adopting the preparation method, the pole piece with short active material length (the length of the active material loaded on each time) and short blank space (the distance between two sections of active materials loaded on the current collector) can be efficiently prepared;
the active material can be uniformly loaded on the current collector, so that the prepared battery has good electrochemical performance; active materials at unnecessary positions can be conveniently recovered, so that the cost is reduced and the environment is protected;
the battery prepared by the method is not easy to have the phenomena of short circuit, burr and the like, and the prepared battery has excellent flexibility and safety performance. And the cost of the spraying method is lower than that of the coating method.
The blank area that the mass flow body surface was reserved does not load active material layer, and this blank area is connected with the connecting band, can protect the active material layer of marginal portion when the pole piece encapsulation not destroyed, does not destroy the active material of edge when the battery is buckled, promotes the security of battery simultaneously, makes the battery can not take place the short circuit when buckling.
The battery prepared by the invention has high energy density and good flexibility. The pole piece can weld the pole ear on the blank area of the current collector directly, can reduce the integral internal resistance of the battery, and improves the charge and discharge performance and capacity of the battery.
Drawings
FIG. 1 is a schematic structural diagram of a pole piece in example 1 of the present invention;
FIG. 2 is a schematic structural diagram of a pole piece in example 5 of the present invention;
FIG. 3 is a schematic structural diagram of a pole piece in example 6 of the present invention;
FIG. 4 is a schematic structural diagram of a pole piece in example 7 of the present invention;
FIG. 5 is a schematic structural diagram of a pole piece in example 8 of the present invention;
FIG. 6 is a schematic structural diagram of a pole piece in example 9 of the present invention;
FIG. 7 is a schematic structural diagram of a pole piece in example 10 of the present invention;
FIG. 8 is a schematic structural diagram of a pole piece in example 11 of the present invention;
FIG. 9 is a schematic view showing another structure of a pole piece in example 11 of the present invention;
in the figure: a current collector 11; a first current collector 111; a second current collector 112; a blank area 12; a first blank area 121; a second blank area 122; a material-covering region 13; a first cladding region 131; a second material coverage area 132; a connecting band 14; a blank region 15; a through hole 16.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Test materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Those skilled in the art who do not specify any particular technique or condition in the examples can follow the techniques or conditions described in the literature in this field or follow the product specification.
Example 1
As shown in fig. 1, the pole piece in this embodiment includes a current collector 11, a connection band 14, and an active material layer (not shown), where the current collector 11 is provided with a blank area 12 and a material-covering area 13, and the number of the current collectors 11 in this embodiment is two.
The current collector 11 includes a first current collector 111 and a second current collector 112, in this embodiment, the shapes of the first current collector 111 and the second current collector 112 are both square but not limited to square, or circular, triangular, diamond-shaped, or trapezoidal, the connection band 14 is located between the first current collector 111 and the second current collector 112, and in order to reduce the number of processes, the connection band 14 is integrally formed with the first current collector 111 and the second current collector 112 in this embodiment.
Two ends of the first current collector 111 are respectively provided with a first blank area 121 and a first material covering area 131, the first blank area 121 is rectangular, the first material covering area 131 is square, the size of the first blank area 121 is smaller than that of the first material covering area 131, and the first blank area 121 is connected with the connecting band 14.
The two ends of the second current collector 112 are respectively provided with a second blank area 122 and a second material covering area 132, the second blank area 122 is rectangular, the second material covering area 132 is square, the size of the second blank area 122 is smaller than that of the second material covering area 132, and the second blank area 122 is connected with the connecting band 14. In this embodiment, the first blank area 121, the connecting band 14 and the second blank area 122 are H-shaped.
Active material layers are respectively coated on the first and second coating regions 131 and 132.
In order to facilitate the tab welding, one end of the first covering region 131 or one end of the second covering region 132 is provided with a blank region 15, the blank region 15 and the first current collector 111 or the second current collector 112 are integrally formed, the blank region 15 and the first blank region 121 are respectively located at two ends of the first covering region 131, or the blank region 15 and the second blank region 122 are respectively located at two ends of the second covering region 132.
In this embodiment, when both the first current collector 111 and the second current collector 112 are aluminum foils, the active material layer is a positive active material layer, and at this time, the electrode sheet is a positive electrode sheet.
The preparation method of the positive pole piece comprises the following steps:
(1) preparing a positive electrode active material: in an argon-protected glove box, taking lithium cobaltate as a positive electrode material, weighing 47.5g of Lithium Cobaltate (LCO), 1g of polyvinylidene fluoride (PVDF), 1g of carbon black (SP), 0.5g of Carbon Nano Tube (CNT) and 25g of N-methylpyrrolidone (NMP), mixing and dispersing to obtain a positive electrode active material; the positive electrode active material in this embodiment may be other positive electrode active materials in the prior art;
(2) taking an aluminum foil as a current collector 11, coating a positive active material on the current collector 11 by adopting a coating machine, removing the positive active material on all blank areas and connecting belts before drying, removing the positive active material on the blank areas and the connecting belts for conveniently welding a positive electrode lug, simultaneously removing the positive active material on the blank areas, and then drying the aluminum foil at 80 ℃ for 24 hours to form a positive active material layer;
(3) in this embodiment, the rolled current collector 11 is cut according to fig. 1 to form a connection band 14, so as to obtain a positive electrode plate; or may not be trimmed.
Example 2
This embodiment is different from embodiment 1 in that: and spraying the positive active material on the current collector by using a spraying machine.
Example 3
The present embodiment is different from embodiment 1 in that: the first current collector 111 and the second current collector 112 are both copper foils, and the active material layer is a negative active material layer, wherein the negative active material layer is in the prior art, and the pole piece is a negative pole piece.
The preparation method of the negative pole piece comprises the following steps:
(1) in an argon-protected glove box, taking artificial graphite as a negative electrode material, weighing 23.5g of artificial graphite, 0.375g of sodium carboxymethylcellulose (CMC-Na), 0.625g of Styrene Butadiene Rubber (SBR), 0.5g of carbon black (SP) and 12.5g of deionized water, mixing and dispersing to obtain a negative electrode active material;
(2) taking a copper foil as a current collector 11, drying the copper foil coated with the negative active material at 80 ℃ for 24h to form a negative active material layer, then putting the current collector 11 into acetone to reduce the adhesive force of the negative active material layer, then erasing the negative active material on the blank area and the connecting belt, and erasing the negative active material on the blank area and the connecting belt for conveniently welding a positive electrode lug and erasing the negative active material on the blank area;
(3) in this embodiment, the rolled current collector 11 is cut according to fig. 1 to form a connecting band, so as to obtain a negative electrode plate; or may not be trimmed.
Example 4
The present embodiment is different from embodiment 3 in that: the negative active material is sprayed on the current collector 11 using a spray coater.
Example 5
This embodiment is different from embodiment 1 or embodiment 3 in that: as shown in fig. 2, the number of the current collectors 11 is greater than two, and the plurality of current collectors 11 are distributed in an array. The number of mass flow body 11 is four in this embodiment, and four mass flow bodies 11 are two rows and two columns and distribute.
Example 6
This embodiment is different from embodiment 1 or embodiment 3 in that: as shown in fig. 3, the number of current collectors 11 is twenty, and the twenty current collectors 11 are distributed in four rows and five columns.
The advantages of this embodiment are: can realize the bending and folding of a plurality of directions, be particularly useful for intelligent clothing, and at crooked in-process, because the mass flow body 11 of being connected with connecting band 14 is blank 12, can protect the active material layer of marginal portion when the pole piece encapsulation not destroyed, does not destroy the active material of edge when the battery is buckled, promotes the security of battery simultaneously, makes the battery can not take place the short circuit when buckling.
Example 7
This embodiment is different from embodiment 1 or embodiment 3 in that: as shown in fig. 4, the connecting band 14 has a trapezoidal shape. In the preparation process of the pole piece, the connecting belt is cut into a trapezoid shape.
Example 8
This embodiment is different from embodiment 1 or embodiment 3 in that: as shown in fig. 5, the number of the connecting bands 14 is plural, and the number of the connecting bands 14 in this embodiment is 2, but not limited to two. In the preparation process of the pole piece of the embodiment, the connecting band is cut.
Example 9
This embodiment is different from embodiment 1 or embodiment 3 in that: as shown in fig. 6, the connection band 14 has a dodecagon shape. In the preparation process of the pole piece of the embodiment, the connecting band is cut into a dodecagon shape.
Example 10
This embodiment is different from embodiment 1 or embodiment 3 in that: as shown in fig. 7, the connecting band 14 is rectangular, wherein both sides of the connecting band 14 are arc-shaped, and the bending direction of the arc-shaped is set according to actual requirements.
Example 11
The present embodiment is different from the above embodiments in that: one of the connecting bands 14 is provided with through holes 16 or a plurality of the connecting bands 14 are provided with through holes 16, the number of the through holes is set according to actual needs, and the shape of the through holes 16 in the embodiment is circular, but not limited to circular, or square, diamond, triangle, or trapezoid. The shape and number of the connection bands 14 and the shape and number of the through holes 16 may be arbitrarily combined. The structures of two of the pole pieces are shown in fig. 8 and 9.
In the process of manufacturing the pole piece of this embodiment, after the connecting band 14 is cut, a hole 16 is formed in the connecting band by using a puncher or other device in the prior art.
The advantages of this embodiment are: the connecting band 14 is provided with a through hole 16, which is suitable for a watchband of a watch or other electronic products, and the length of the watchband can be conveniently adjusted according to the shape of the watchband.
Example 12
This embodiment is different from embodiment 1 or embodiment 3 in that: the active material layer on the first blank region 121 or the second blank region 122 is removed.
Example 13
This embodiment is different from embodiment 5 in that: the active material layer on the 5 blank regions is removed.
Example 14
The present embodiment provides a battery, which is prepared by using the pole piece in the foregoing embodiments, taking the pole piece in embodiments 1 to 4 as an example, and includes the following steps:
(1) welding a positive electrode tab on the blank area 15 of the positive electrode plate in the embodiment 1 or 2, and welding a negative electrode tab on the blank area 15 of the negative electrode plate in the embodiment 3 or 4;
(2) then winding the positive pole piece, the diaphragm and the negative pole piece in sequence to form a winding core or laminating to form a laminated core;
(3) and injecting liquid electrolyte into the winding core or the stacked core, carrying out primary packaging, then carrying out aging and formation, and finally carrying out secondary packaging to obtain the battery.
When the electrolyte is a solid electrolyte, the solid electrolyte is loaded between the positive pole piece and the negative pole piece.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A preparation method of a pole piece is characterized by comprising the following steps: the pole piece comprises a current collector, a connecting belt and an active material layer; the number of the current collectors is more than two, and the connecting band is positioned between the adjacent current collectors;
the current collector is provided with a blank area and a material covering area, the blank area is positioned at the end part of the current collector and is connected with the connecting belt, and the active material layer is positioned in the material covering area;
the preparation method of the pole piece comprises the following steps:
(1) coating or spraying an active material on a current collector;
(2) removing active materials on the connecting belt and the blank areas of the current collectors before drying, and then drying and rolling, or removing the active materials on the blank areas of the current collectors and the connecting belt after drying, and then rolling to obtain a pole piece;
(3) when the active material is a negative active material, the obtained pole piece is a negative pole piece; when the active material is a positive electrode active material, the obtained pole piece is a positive pole piece.
2. The preparation method of the pole piece according to claim 1, characterized in that: and cutting the connecting band.
3. The method for preparing a pole piece according to claim 2, wherein the method comprises the following steps: after the connecting belt is cut, a through hole is formed in the connecting belt.
4. The preparation method of the pole piece according to claim 3, characterized in that: the through holes are round, square, diamond, triangular or trapezoidal.
5. The preparation method of the pole piece according to claim 1, characterized in that: and (4) putting the dried current collector into an organic solvent, and then erasing the active material on the blank area of the current collector.
6. The preparation method of the pole piece according to claim 1, characterized in that: the number of the current collectors is more than two, and the current collectors are distributed in an array.
7. The method for preparing a pole piece according to claim 1, wherein the method comprises the following steps: one end in the mass flow body material covering area is equipped with and is used for utmost point ear welded to leave white district, it is located the both ends in material covering area respectively with blank district to leave white district.
8. The method for preparing the pole piece according to any one of claims 1 to 7, wherein: the number of the connecting bands is multiple.
9. The preparation method of the pole piece according to claim 8, characterized in that: the connecting belt is polygonal or any side of the connecting belt is arc-shaped.
10. A method for manufacturing a battery, comprising: the method comprises the following steps:
(1) respectively obtaining a positive pole piece and a negative pole piece by adopting the preparation method of the pole piece of claim 1, welding a positive pole tab on the positive pole piece, and welding a negative pole tab on the negative pole piece;
(2) then winding the positive pole piece, the diaphragm and the negative pole piece in sequence to form a winding core or laminating to form a laminated core;
(3) and injecting electrolyte into the winding core or the stacked core, and packaging to obtain the battery.
CN202011623882.9A 2020-12-30 2020-12-30 Preparation method of pole piece and preparation method of battery Pending CN114695832A (en)

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Application Number Priority Date Filing Date Title
CN202011623882.9A CN114695832A (en) 2020-12-30 2020-12-30 Preparation method of pole piece and preparation method of battery
PCT/CN2021/139654 WO2022143260A1 (en) 2020-12-30 2021-12-20 Pole piece, battery comprising pole piece, and manufacturing methods

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Application Number Priority Date Filing Date Title
CN202011623882.9A CN114695832A (en) 2020-12-30 2020-12-30 Preparation method of pole piece and preparation method of battery

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CN114695832A true CN114695832A (en) 2022-07-01

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