WO2023050939A1 - 一种卷绕方法、卷绕机、电极组件及电池单体 - Google Patents

一种卷绕方法、卷绕机、电极组件及电池单体 Download PDF

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Publication number
WO2023050939A1
WO2023050939A1 PCT/CN2022/102017 CN2022102017W WO2023050939A1 WO 2023050939 A1 WO2023050939 A1 WO 2023050939A1 CN 2022102017 W CN2022102017 W CN 2022102017W WO 2023050939 A1 WO2023050939 A1 WO 2023050939A1
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WIPO (PCT)
Prior art keywords
winding
pole piece
needle
diaphragm
cathode
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PCT/CN2022/102017
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English (en)
French (fr)
Inventor
吴志阳
王艺若
林纲
廖国航
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宁德时代新能源科技股份有限公司
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Publication of WO2023050939A1 publication Critical patent/WO2023050939A1/zh

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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H01M10/0409—Machines for assembling batteries for cells with wound electrodes
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • 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

Definitions

  • the present application relates to the battery field, in particular to a winding method, a winding machine, an electrode assembly and a battery cell.
  • the separator is usually wound first, and then the cathode pole piece and the anode pole piece are wound. Therefore, when the cathode electrode sheet and the anode electrode sheet start to be wound, the heads of the cathode electrode sheet and the anode electrode sheet tend to be folded.
  • the present application provides a winding method, a winding machine, an electrode assembly and a battery cell, so as to solve the problem of the cathode electrode sheet and the anode electrode sheet and the diaphragm in some cases when winding the cathode electrode sheet and the anode electrode sheet.
  • the head of the anode pole piece is prone to the problem of discount.
  • the embodiment of the present application provides a winding method for winding the cathode pole piece, the anode pole piece and the diaphragm to form an electrode assembly.
  • the winding method includes: the head of the cathode pole piece, the anode pole piece and the diaphragm The part is sandwiched between the first half needle and the second half needle of the winding needle assembly at the winding station; rotate the winding needle assembly at the winding station to wind the cathode pole piece, the anode pole piece and a separator to form an electrode assembly.
  • the first half-rolling needle and the second half-rolling needle directly clamp the head of the fed cathode pole piece, anode pole piece and diaphragm Part, instead of winding the diaphragm first in some cases, and then winding the cathode and anode pole pieces through the diaphragm, so it can avoid the discount of the cathode pole piece and the anode pole piece at the beginning of winding, so as to solve the problem in some cases
  • the head of the cathode pole piece and the anode pole piece is prone to be folded.
  • the winding method further includes: cutting off the cathode pole piece upstream of the winding station; moving the winding needle assembly from the winding station to a downstream non-winding station; Another needle assembly of the station moves to the winding station; another needle assembly located at the winding station holds the head of the cathode sheet, anode sheet and diaphragm for forming the next electrode assembly; The anode pole piece and separator are cut between the winding station and the non-winding station.
  • the cathode pole piece while winding the cathode pole piece, the anode pole piece and the diaphragm, the cathode pole piece is cut off first, and then cut off when the cathode pole piece is completely wound and only the anode pole piece and the diaphragm are left. Anode plate and diaphragm.
  • the winding method further includes: feeding the head of the cut cathode electrode piece into the first half needle and the second half needle assembly of another needle assembly located at the winding station between. By placing the head of the cut cathode pole piece between the first half-rolling needle and the second half-rolling needle, the heads of the cathode pole piece, the anode pole piece and the separator can be clamped and wound to form Next electrode assembly.
  • the winding method further includes: at the upstream of the winding station, the clamping and feeding mechanism clamps the heads of the cathode electrode sheet, the anode electrode sheet and the diaphragm together and sends them into the first half of the winding needle and between the second half of the roll needle.
  • the clamping and feeding mechanism clamps the heads of the cathode electrode sheet, the anode electrode sheet and the diaphragm together and sends them into the first half of the winding needle and between the second half of the roll needle.
  • the winding method further includes, after the head of the cathode pole piece, the anode pole piece and the separator enters between the first half-rolling needle and the second half-rolling needle, the telescopic mechanism drives the clamping cathode
  • the clamping and feeding mechanism of the pole piece, the anode pole piece and the diaphragm deviates to the first direction, and the direction in which the head of the cathode pole piece, the anode pole piece and the diaphragm enters between the first half-roll needle and the second half-roll needle is the second half-roll needle. Two directions, the first direction intersects with the second direction.
  • the telescopic mechanism drives the clamping and feeding mechanism to shift in the first direction, so that the heads of the cathode pole piece, the anode pole piece and the diaphragm can be retreated and placed between the first half-rolling needle and the second half-rolling needle, so that it can effectively Prevent the accumulation of anode sheets inside the electrode assembly and improve the quality of the electrode assembly.
  • the cathode electrode sheet, the anode electrode sheet and the head of the separator are sandwiched between the first half of the needle assembly and the second half of the needle at the winding station.
  • the winding method also includes compounding the cathode pole piece, the anode pole piece and the diaphragm.
  • the embodiment of the present application provides a winding machine, including: a winding mechanism, including a needle winding assembly, the needle winding assembly is used to wind the cathode electrode sheet, the anode electrode sheet and the separator to form an electrode assembly, the needle winding assembly
  • the assembly includes a first half-rolling pin and a second half-rolling pin configured to be relatively movable so as to clamp the cathode pole piece, the anode pole piece and the head of the diaphragm.
  • the needle assembly includes a first half of the needle and a second half of the needle that can move relatively.
  • the first half-rolling needle and the second half-rolling needle directly clamp the head of the fed cathode pole piece, anode pole piece and diaphragm, replacing the In some cases, the separator is wound first, and then the cathode and anode sheets are wound through the diaphragm, so that the cathode and anode sheets can be avoided from being folded at the beginning of winding, thereby solving the problem of the cathode electrode in some cases.
  • the cathode sheet, the anode sheet and the diaphragm are wound, the heads of the cathode sheet and the anode sheet tend to be folded.
  • a clamping and feeding mechanism which is arranged upstream of the winding mechanism, and is used to clamp and feed the heads of the cathode pole piece, the anode pole piece and the separator into the first half-rolling needle and the second half-rolling needle. Between the two halves of the needles.
  • a clamping and feeding mechanism upstream of the winding mechanism, the heads of the cathode electrode sheet, the anode electrode sheet and the separator can be smoothly guided between the first half-rolling needle and the second half-rolling needle of the winding mechanism.
  • the clamping and feeding mechanism includes a first clamping roller, a second clamping roller and a driving mechanism, and the first clamping roller and the second clamping roller are configured to be relatively movable to clamp the cathode pole piece, the anode The pole piece and the separator, the first nip roller and/or the second nip roller are connected with the driving mechanism to transport the cathode pole piece, the anode pole piece and the membrane.
  • the driving mechanism to rotate the first nip roller and/or the second nip roller the traction and drive of the cathode pole piece, the anode pole piece and the diaphragm can be easily realized, and the pulling of the cathode pole piece, the anode pole piece and the diaphragm can be avoided, causing The problem of damage.
  • a telescopic mechanism the telescopic mechanism is connected with the clamping and feeding mechanism, and is used to, after the cathode electrode piece, the anode electrode piece and the diaphragm enter the first half-rolling needle and the second half-rolling needle, Drive the clamping and feeding mechanism to move along the first direction; wherein, the direction between the cathode pole piece, the anode pole piece and the diaphragm entering between the first half-rolling needle and the second half-rolling needle is the second direction, and the first direction and the second half-rolling needle are in the second direction.
  • the directions intersect.
  • the telescopic mechanism drives the clamping and feeding mechanism to shift in the first direction, so that the heads of the cathode electrode piece, the anode electrode piece and the diaphragm can be retracted and placed between the first half-roll needle and the second half-roll needle Therefore, it can effectively prevent the accumulation of anode sheets inside the electrode assembly and improve the quality of the electrode assembly.
  • the winding machine further includes: a first cutter for cutting off the cathode sheet, and the first cutter is arranged upstream of the winding mechanism.
  • a first cutter is provided upstream of the winding mechanism, which can cut off the cathode electrode sheet in time when the cathode electrode sheet is unwound to a preset length.
  • the winding mechanism further includes a turret, and a plurality of needle winding assemblies are arranged on the turret, and the turret is used to place the plurality of needle winding assemblies between the winding station and the non-winding station.
  • Switching between, the winding needle assembly at the winding station is used to wind the cathode pole piece, the anode pole piece and the separator to form the electrode assembly.
  • the continuous and uninterrupted production of the electrode assembly can be realized by switching the winding needle assembly between the winding station and the non-winding station through the turret.
  • the winding machine also includes a second cutter, the second cutter is used to cut off the anode pole piece and the diaphragm, and the second cutter is arranged between the winding station and the non-winding station .
  • the second cutter By arranging the second cutter between the winding station and the non-winding station, the anode electrode sheet and the separator can be cut off simultaneously after the cut cathode electrode sheet is completely rolled into the separator.
  • the winding machine further includes guide rollers, and the guide rollers are located between the winding station and the non-winding station;
  • the direction between the needle and the second half of the needle is the second direction, and the guide roller is tangent to the second direction.
  • the first half-rolling pin includes a first plane; the second half-rolling pin includes a second plane; the first plane and the second plane are planes for clamping the cathode pole piece, the anode pole piece and the diaphragm ; A notch is formed at the end of the first plane or the second plane.
  • the path of the anode pole piece and the diaphragm between the first plane and the second plane is lengthened, so that the head of the severed anode pole piece and the diaphragm can be recovered Enter the winding needle assembly, so that the cathode electrode piece, anode electrode piece and separator are located inside the first half-rolling needle and the second half-rolling needle, avoiding the cathode electrode piece, anode electrode piece and separator winding around the first half-rolling needle or
  • the outer circumference of the second half of the rolling needle prevents the accumulation of anode sheets inside the electrode assembly and improves the quality of the electrode assembly.
  • the embodiment of the present application further provides an electrode assembly, which is manufactured by any one of the winding methods in the first aspect above.
  • the electrode assembly of the battery cell provided in the embodiment of the present application can be manufactured by the winding method in the above embodiment.
  • the heads of the cathode electrode sheet and the anode electrode sheet are flat, and the battery cell has the advantages of stable operation, safe and reliable use.
  • the electrode assembly includes: a cathode pole piece, an anode pole piece and a separator, and the head of the anode pole piece is flush with the head of the separator.
  • the tail of the anode plate is flush with the tail of the diaphragm. Since the head and tail of the anode pole piece and the diaphragm are flush, the diaphragm in the electrode assembly is significantly shorter than the electrode assembly of the related technology, thus effectively reducing the length of the diaphragm that does not participate in the electrode reaction and improving the battery life. Energy Density.
  • the embodiment of the present application further provides a battery cell, including the electrode assembly according to any one of the above third aspects.
  • the battery cell provided by the present application has all the beneficial effects of the above-mentioned electrode assembly of the third aspect because it has the above-mentioned electrode assembly of the third aspect.
  • Fig. 1 is a flow chart of a winding method provided by the embodiment of the present application.
  • Fig. 2 is a flowchart of another winding method provided by the embodiment of the present application.
  • Fig. 3 is a structural schematic diagram of a winding machine provided in the embodiment of the present application when clamping the cathode pole piece, the anode pole piece and the diaphragm head;
  • Fig. 4 is a structural schematic diagram of a winding machine provided in the embodiment of the present application when cutting the anode pole piece and the diaphragm and winding the cathode pole piece, the anode pole piece and the diaphragm;
  • Fig. 5 is a schematic structural view of a needle winding assembly in the winding machine of Fig. 3;
  • Fig. 6 is a schematic structural view of another needle winding assembly in the winding machine of Fig. 3;
  • FIG. 7 is a schematic structural diagram of an electrode assembly provided in an embodiment of the present application.
  • Electrode assembly 11—cathode pole piece, 12—anode pole piece, 13—diaphragm;
  • 21 needle assembly
  • 211 the first half of the needle
  • 212 the second half of the needle
  • 213 the curved surface
  • 214 the first plane
  • 215 the second plane
  • 216 the groove
  • 217 the third plane
  • 218 the fifth plane
  • 219 the fourth plane
  • 220 the fifth plane
  • multiple refers to more than two (including two), similarly, “multiple groups” refers to more than two groups (including two), and “multiple pieces” refers to More than two pieces (including two pieces).
  • the head of the separator when winding the electrode assembly, the head of the separator is usually clamped by the winding needle assembly and wound several times, and then the heads of the cathode electrode piece and the anode electrode piece enter between the two layers of separators, through The two diaphragms clamp the cathode and anode pole pieces for winding, and when the heads of the cathode pole piece and the anode pole piece enter the two-layer separator, they are easy to collide with the winding needle assembly, thereby causing the cathode pole piece and the anode pole piece to collide with each other.
  • the head discounts the problem.
  • the applicant proposes a winding method, a winding machine, a motor assembly and a battery cell in this application. Winding, so that the head of the cathode anode and the diaphragm will not contact the outer periphery of the needle winding assembly, thereby solving the problem of the collision between the head of the cathode pole piece and the anode pole piece and the needle winding assembly.
  • FIG. 1 is a flow chart of a winding method provided by an embodiment of the present application.
  • the embodiment of the present application provides a winding method for winding the cathode electrode piece 11 , the anode electrode piece 12 and the separator 13 to form the electrode assembly 1 .
  • This method is applied to winding machines.
  • the winding machine includes a telescopically movable needle winding assembly 21 .
  • the needle assembly 21 includes a first half needle 211 and a second half needle 212 which are relatively movable.
  • the winding method may include the following steps:
  • the first half-roll needle 211 and the second half-roll needle 212 directly clamp the fed cathode pole piece 11, the anode pole piece 12 and the diaphragm 13 head.
  • the rotation direction of the needle winding assembly 21 may be clockwise or counterclockwise.
  • the specific rotation direction is determined according to actual needs, which is not specifically limited in the present application.
  • the first half-roll needle 211 and the second half-roll needle 212 directly clamp the fed cathode pole piece 11, anode pole piece
  • the head of the pole piece 12 and the diaphragm 13 replaces the winding of the diaphragm 13 in some cases, and then winds the cathode pole piece 11 and the anode pole piece 12 through the diaphragm 13, so that the cathode pole piece 11 and the anode pole piece 12 can be avoided.
  • Knocking occurs at the beginning of winding, thereby solving the problem that in some cases, when the cathode pole piece 11, the anode pole piece 12 and the diaphragm 13 are wound, the heads of the cathode pole piece 11 and the anode pole piece 12 are prone to buckle. .
  • FIG. 2 is a flow chart of another winding method provided by the embodiment of the present application.
  • the embodiment of the present application also provides another winding method, which includes:
  • steps S201-S202 may be the same as steps S101-S102 in the above-mentioned embodiment, and details are not repeated here.
  • upstream and downstream refer to the incoming and outgoing directions of the cathode electrode piece 11 , the anode electrode piece 12 and the separator 13 relative to the winding station 221 , which have nothing to do with the position of the winding station 221 itself.
  • the step of moving the needle roller assembly 21 in S204 may be performed simultaneously with the step of cutting the cathode sheet 11 in S203, or may be performed before or after the step of cutting the cathode sheet 11 in S203. Which way to choose specifically can be determined according to the actual length of the cathode pole piece 11 .
  • step of moving the other needle winding assembly 21 of the non-winding station 222 in S205 may be performed simultaneously with the step of moving the needle winding assembly 21 in S204, or may be performed before or after the step of moving the needle winding assembly 21 in S204.
  • This embodiment of the present application does not specifically limit it.
  • the above steps are repeated to continue clamping and winding the next electrode assembly 1 .
  • the previous electrode assembly 1 enters the subsequent steps of applying the finishing glue and blanking. Since the finishing glue and blanking belong to the common knowledge in the field, details will not be described here.
  • the head of cathode pole piece 11, anode pole piece 12 and diaphragm 13 are sent into the middle of the first half-roll needle 211 and the second half-roll needle 212, and the winding station
  • the first half-roll needle 211 and the second half-roll needle 212 of 221 only need to clamp the anode pole piece 12 and the diaphragm 13 before cutting, and then cut off the anode pole piece between the winding station 221 and the non-winding station 222 12 and diaphragm 13, needn't feed repeatedly, have improved winding efficiency.
  • the winding method may further include the following steps:
  • the head of the cut cathode sheet 11 is fed into between the first half needle 211 and the second half needle 212 of another needle assembly 21 located at the winding station 221 .
  • the above embodiment of the winding method further includes the following steps:
  • the clamping and feeding mechanism 3 clamps the heads of the cathode pole piece 11, the anode pole piece 12 and the separator 13 and sends them between the first half-roll needle 211 and the second half-roll needle 212. .
  • the clamping and feeding mechanism 3 can be used to drive the cathode electrode piece 11 , the anode electrode piece 12 and the diaphragm 13 into the winding mechanism 2 .
  • the heads of the cathode electrode piece 11 , the anode electrode piece 12 and the separator 13 can be smoothly guided between the first half-rolling needle 211 and the second half-rolling needle 212 of the winding mechanism 2 .
  • the specific structure of the clamping and feeding mechanism 3 will be specifically described in the following device embodiments.
  • the above embodiments of the winding method may further include the following steps:
  • the retractable mechanism drives and clamps the cathode pole piece 11, the anode pole piece 12 and the diaphragm
  • the clamping and feeding mechanism 3 of 13 deviates to the first direction L, and the direction in which the heads of the cathode pole piece 11, the anode pole piece 12 and the diaphragm 13 enter between the first half-roll needle 211 and the second half-roll needle 212 is the second half-roll needle 212.
  • Two directions M, the first direction L and the second direction M intersect.
  • the telescopic mechanism drives the clamping and feeding mechanism 3 to shift in the first direction L, so that the heads of the cathode electrode piece 11, the anode electrode piece 12 and the diaphragm 13 can be retracted and placed on the first half-roll needle 211 and the second half-rolling pin 212 , thereby effectively preventing the accumulation of the anode pole piece 12 inside the electrode assembly 1 and improving the quality of the electrode assembly 1 .
  • the telescopic mechanism can be an air cylinder, an oil cylinder, a ball screw, etc., which can be flexibly selected according to actual needs in practical applications.
  • the head of the cathode pole piece 11, the anode pole piece 12 and the diaphragm 13 are clamped to the winding needle assembly 21 at the winding station 221.
  • the following steps may be included:
  • the cathode pole piece 11, the anode pole piece 12 and the separator 13 are combined.
  • the cathode pole piece 11, the anode pole piece 12 and the diaphragm 13 can also be complex.
  • the compounding method includes but not limited to heating compounding or cold compounding by adding an adhesive on the separator 13 .
  • the compounding of the anode electrode piece 12 and the diaphragm 13 can be completed inside the winding machine, or can be completed outside the winding machine and then wound by the winding machine.
  • the cathode pole piece 11, the anode pole piece 12 and the diaphragm 13 can be effectively fixed together, so that the cathode pole piece 11, the anode pole piece 12 and the head of the septum 13 can more easily enter between the first half-roll needle 211 and the second half-roll needle 212.
  • Figure 3 is a structural schematic diagram of a winding machine provided in the embodiment of the present application when clamping the cathode pole piece, the anode pole piece and the diaphragm head; A schematic diagram of the structure of the winding machine when cutting the anode pole piece and the diaphragm and winding the cathode pole piece, the anode pole piece and the diaphragm.
  • the embodiment of the present application also provides a winding machine, the winding machine includes:
  • the winding mechanism 2 includes a winding needle assembly 21.
  • the winding needle assembly 21 is used to wind the cathode pole piece 11, the anode pole piece 12 and the separator 13 to form the electrode assembly 1.
  • the winding needle assembly 21 includes a first half winding needle 211 and The second half-rolling pin 212 , the first half-rolling pin 211 and the second half-rolling pin 212 are configured to be relatively movable so as to clamp the heads of the cathode electrode piece 11 , the anode electrode piece 12 and the diaphragm 13 .
  • the needle roller assembly 21 can have various structures, for example, it can be a columnar structure, a block structure, etc.;
  • the structures of the first half-rolling pin 211 and the second half-rolling pin 212 will be described in detail below, and will not be repeated here.
  • both the first half-rolling needle 211 and the second half-rolling needle 212 can be stretched in the width direction of the cathode electrode sheet 11 or the anode electrode sheet 12 (as shown in the direction perpendicular to the paper in Figures 3 and 4), so as to clamp the cathode Pole piece 11, anode pole piece 12 and diaphragm 13.
  • the needle assembly 21 includes a first half needle 211 and a second half needle 212 that are relatively movable.
  • the first half-roll needle 211 and the second half-roll needle 212 directly clamp the fed cathode pole piece 11, anode pole piece 12 and The head of diaphragm 13 replaces winding diaphragm 13 earlier in some cases, and then winds cathode pole piece 11 and anode pole piece 12 by diaphragm 13, so can avoid cathode pole piece 11 and anode pole piece 12 at the beginning of winding
  • it solves the problem that in some cases, when the cathode electrode sheet 11, the anode electrode sheet 12 and the separator 13 are wound, the heads of the cathode electrode sheet 11 and the anode electrode sheet 12 are prone to be discounted.
  • the winding machine may also include: a clamping and feeding mechanism 3, arranged upstream of the winding mechanism 2, for clamping the heads of the cathode pole piece 11, the anode pole piece 12 and the diaphragm 13 Feed between the first half needle 211 and the second half needle 212.
  • a clamping and feeding mechanism 3 arranged upstream of the winding mechanism 2, for clamping the heads of the cathode pole piece 11, the anode pole piece 12 and the diaphragm 13 Feed between the first half needle 211 and the second half needle 212.
  • the heads of the cathode electrode piece 11, the anode electrode piece 12 and the separator 13 can be smoothly guided to the first half of the winding needle 211 of the winding mechanism 2 and between the second half of the needle 212.
  • the clamping and feeding mechanism 3 includes a first clamping roller 31, a second clamping roller 32 and a driving mechanism, and the first clamping roller 31 and the second clamping roller 32 are configured to be relatively movable to clamp
  • the cathode pole piece 11 , the anode pole piece 12 and the diaphragm 13 , the first nip roller 31 and/or the second nip roller 32 are connected with the driving mechanism to transport the cathode pole piece 11 , the anode pole piece 12 and the diaphragm 13 .
  • the driving mechanism drives the first nip roller 31 and/or the second nip roller 32 to rotate, so that the traction and driving of the cathode pole piece 11, the anode pole piece 12 and the diaphragm 13 can be easily realized, and the negative impact on the cathode pole piece 11 can be avoided.
  • the anode pole piece 12 and the diaphragm 13 are pulled, causing damage.
  • the clamping and feeding mechanism 3 actively clamps and sends the heads of the cathode electrode piece 11, the anode electrode piece 12 and the separator 13 into the winding mechanism 2 through the driving mechanism, that is, the clamping and feeding mechanism 3 provides traction to drive the cathode electrode.
  • the movement of the sheet 11, the anode sheet 12 and the diaphragm 13 can make the stress on the cathode sheet 11, the anode sheet 12 and the diaphragm 13 more balanced, and avoid excessive deformation of the cathode sheet 11, the anode sheet 12 and the diaphragm 13 .
  • the winding machine can also include: a telescopic mechanism, which is connected with the clamping and feeding mechanism 3, and is used to enter the first half of the needle when the cathode pole piece 11, the anode pole piece 12 and the diaphragm 13 211 and the second half-volume needle 212, drive the clamping and feeding mechanism 3 to move along the first direction L; wherein, the cathode pole piece 11, the anode pole piece 12 and the diaphragm 13 enter the first half-roll needle 211 and the second half-roll needle 211 and the second half-roll needle
  • the direction between the needles 212 is the second direction M, and the first direction L intersects the second direction M.
  • the clamping and feeding mechanism 3 provided in the embodiment of the present application can not only drive the cathode electrode piece 11, the anode electrode piece 12 and the diaphragm 13 to move, but also the clamping and feeding mechanism 3 can also move under the drive of the telescopic mechanism.
  • the telescopic mechanism connected to the clamping and feeding mechanism 3 can push or pull the clamping and feeding mechanism 3 to move along the first direction L.
  • the first direction L intersects the second direction M in which the cathode sheet 11 and the separator 13 enter between the first half-rolling needle 211 and the second half-rolling needle 212 .
  • the included angle between the first direction L and the second direction M may be an obtuse angle, an acute angle, or a right angle.
  • the telescopic mechanism drives the clamping and feeding mechanism 3 to shift in the first direction L, so that the heads of the cathode electrode piece 11, the anode electrode piece 12 and the diaphragm 13 can be retracted and placed on the first half-rolling needle 211 and Between the second and half rolling pins 212 , it is possible to effectively prevent the accumulation of the anode pole piece 12 inside the electrode assembly 1 and improve the quality of the electrode assembly 1 .
  • the winding machine may further include: a first cutter 4 for cutting the cathode sheet 11 , and the first cutter 4 is arranged upstream of the winding mechanism 2 .
  • a first cutter 4 is provided upstream of the winding mechanism 2 to cut off the cathode electrode sheet 11 in time when the cathode electrode sheet 11 is unwound to a preset length.
  • the winding mechanism 2 may also include a turret 22, on which a plurality of needle winding assemblies 21 are arranged, and the turret 22 is used to place a plurality of winding needle assemblies 21 on the winding station Switch between 221 and non-winding station 222 , the winding needle assembly 21 at the winding station 221 is used to wind the cathode pole piece 11 , the anode pole piece 12 and the separator 13 to form the electrode assembly 1 .
  • the turret 22 of the winding mechanism 2 can switch the plurality of winding needle assemblies 21 between the winding station 221 and the non-winding station 222 through its own rotation.
  • a plurality of needle roller assemblies 21 can be arranged on the turret 22 in an annular array.
  • the needle winding assembly 21 telescopically moves and rotates relative to the turret 22 , so as to realize the clamping, releasing and winding of the cathode pole piece 11 , the anode pole piece 12 and the diaphragm 13 .
  • the number of non-winding station 222 is at least one. When there is only one non-winding station 222 , the non-winding station 222 can be used for affixing tailing glue and unloading the electrode assembly 1 at the same time. When there are more than two non-winding stations 222 , the electrode assembly 1 can be pasted with a tailing glue at one non-winding station 222 , and the electrode assembly 1 can be unloaded at the other non-winding station 222 .
  • the continuous and uninterrupted production of the electrode assembly 1 can be realized by switching the winding needle assembly 21 between the winding station 221 and the non-winding station 222 through the turret 22 .
  • the winding machine can also include a second cutter 5, the second cutter 5 is used to cut off the anode pole piece 12 and the diaphragm 13, and the second cutter 5 is arranged at the winding station 221 and Between non-winding stations 222.
  • a second cutter 5 is provided between the winding station 221 and the non-winding station 222, and the anode electrode sheet 12 and the separator can be cut off at the same time after the cut cathode electrode sheet 11 is completely rolled into the separator 13 13.
  • the anode pole piece 12 and the diaphragm 13 can be cut off simultaneously by using a knife once, instead of cutting off the anode pole piece 12 and the diaphragm 13 respectively in two times; and the anode pole piece 12 after cutting And the head of the separator 13 is clamped by the winding needle assembly 21 when the next electrode assembly 1 is wound, and there is no need to perform the feeding action again, so the winding efficiency can be further improved.
  • the winding machine can also include a guide roller 6, and the guide roller 6 is located between the winding station 221 and the non-winding station 222; wherein, the cathode pole piece 11, the anode pole piece 12 and the The direction in which the diaphragm 13 enters between the first half-rolling needle 211 and the second half-rolling needle 212 is the second direction M, and the guide roller 6 is tangent to the second direction M.
  • the needle winding assembly 21 located at the winding station 221 can smoothly extend and clamp the cathode electrode piece 11 , the anode electrode piece 12 and the separator 13 .
  • the first half needle 211 includes a first plane 214; the second half needle 212 includes a second plane 215; the first plane 214 and the second plane 215 is a plane clamping the cathode pole piece 11 , the anode pole piece 12 and the separator 13 ; a notch 218 is formed at the end of the first plane 214 or the second plane 215 .
  • the notch 218 can be obtained by cutting a part of the structure of the first half of the needle 211 or the second half of the needle 212 .
  • the cross-sectional shapes of the first half-roll needle 211 and the second half-roll needle 212 are designed according to actual needs, for example, it can be a semicircle as shown in Figure 5, or a semi-rhombic shape as shown in Figure 6 . As shown in FIG.
  • the semicircle may include an arc-shaped curved surface 213, a first plane 214 and The third plane 217 connecting the curved surface 213 and the first plane 214; wherein the angle between the third plane 217 and the first plane 214 is an obtuse angle; the arc of the curved surface 213 is less than ⁇ radians.
  • the triangle can include the first plane 214, the fourth plane 219, the fifth plane 220 and the third plane 217 connecting the fifth plane 220 and the first plane 214 .
  • grooves 216 are provided on the outer circumferences of the first half-rolling needle 211 and the second half-rolling needle 212 , and the grooves 216 are used to clamp the electrode assembly 1 to realize the blanking of the electrode assembly 1 .
  • the path between the anode pole piece 12 and the diaphragm 13 between the first plane 214 and the second plane 215 becomes longer, thereby
  • the severed anode pole piece 12 and the head of the diaphragm 13 can be recycled into the winding needle assembly 21, so that the cathode pole piece 11, the anode pole piece 12 and the diaphragm 13 are located inside the first half winding needle 211 and the second half winding needle 212
  • the cathode pole piece 11 the anode pole piece 12 and the separator 13 from being wound around the outer circumference of the first half-rolling needle 211 or the second half-rolling needle 212, prevent the accumulation of the anode pole piece 12 inside the electrode assembly 1, and improve the stability of the electrode assembly 1 quality.
  • the winding machine provided in the embodiment of the present application may also include a tailing glue disposed at the non-winding station 222
  • the mechanism 7 and the unloading mechanism 8 are not described in detail here, since the tail glue sticking mechanism 7 and the unloading mechanism 8 belong to common knowledge in the art.
  • the embodiment of the present application also provides an electrode assembly 1 , which is manufactured by any of the above-mentioned winding methods.
  • the electrode assembly 1 of the battery cell provided in the embodiment of the present application can be manufactured by the winding method in the above embodiment. It can be understood that, before the method of the above-mentioned embodiment starts winding, the heads of the cathode pole piece 11, the anode pole piece 12 and the separator 13 are clamped on the needle winding assembly 21 at the winding station 221. Between the first half-rolled needle 211 and the second half-rolled needle 212 , the cathode electrode piece 11 , the anode electrode piece 12 and the separator 13 manufactured by this method are located at the innermost circle of the electrode assembly 1 .
  • the heads of the cathode electrode sheet 11 and the anode electrode sheet 12 are flat, and the battery cell has the advantages of stable operation, safe and reliable use.
  • the head of the anode sheet 12 is flush with the head of the diaphragm 13 .
  • the tail of the anode sheet 12 is flush with the tail of the diaphragm 13 .
  • the electrode assembly 1 is formed by stacking and winding a cathode pole piece 11 , an anode pole piece 12 and a separator 13 .
  • the anode pole piece 12 can be placed on the uppermost layer or the lowermost layer of the cathode pole piece 11 and the separator 13 .
  • corresponding winding directions can be used for winding, so that the anode pole piece 12 in the obtained electrode assembly 1 is located at the innermost layer of the electrode assembly 1 .
  • the electrode assembly has multiple turns of the separator 13, the The multi-turn diaphragm 13 does not participate in the electrode reaction.
  • the diaphragm 13 in the electrode assembly 1 is significantly larger than the electrode assembly in the related art. Therefore, the length of the diaphragm 13 that does not participate in the electrode reaction is effectively reduced, and the energy density of the battery cell is improved.
  • the embodiment of the present application also provides a battery cell, including any one of the above-mentioned electrode assemblies 1 .
  • the battery cell provided by the present application has all the beneficial effects of the above-mentioned electrode assembly 1 because it has the above-mentioned electrode assembly 1 .
  • the cathode sheet 11 is sandwiched between the two separators 13 .
  • the cathode electrode piece 11 is sandwiched between two separators 13, so that the cathode electrode piece 11 can be protected by the separators 13 on both sides, and the situation that the head of the cathode electrode piece 11 is folded is improved.

Abstract

本申请公开了一种卷绕方法、卷绕机、电极组件及电池单体，其中，卷绕方法包括：将阳极极片、阴极极片和隔膜的头部夹设于在卷绕工位处的卷针组件的第一半卷针和第二半卷针之间；旋转在卷绕工位处的卷针组件以卷绕阳极极片、阴极极片和隔膜，从而形成电极组件。通过本方案可以解决一些情况下在对阴极极片、阳极极片和隔膜进行卷绕时，阴极极片和阳极极片的头部容易发生打折的问题。

Description

一种卷绕方法、卷绕机、电极组件及电池单体
交叉引用
本申请引用于2021年9月30日递交的名称为“一种卷绕方法、卷绕机、电极组件及电池单体”的第202111162507.3号中国专利申请，其通过引用被全部并入本申请。
技术领域
本申请涉及电池领域，具体涉及一种卷绕方法、卷绕机、电极组件及电池单体。
背景技术
在一些情形下卷绕机在对阴极极片、阳极极片和隔膜进行卷绕时，通常是先卷绕隔膜，然后再卷绕阴极极片和阳极极片。因此，在阴极极片、阳极极片开始进行卷绕时，阴极极片和阳极极片的头部容易发生打折。
发明内容
鉴于上述问题，本申请提供一种卷绕方法、卷绕机、电极组件及电池单体，以解决在一些情形下在对阴极极片、阳极极片和隔膜进行卷绕时，阴极极片和阳极极片的头部容易发生打折的问题。
第一方面，本申请实施例提供一种卷绕方法，用于卷绕阴极极片、阳极极片和隔膜以形成电极组件，卷绕方法包括：将阴极极片、阳极极片和隔膜的头部夹设于在卷绕工位处的卷针组件的第一半卷针和第二半卷针之间；旋转在卷绕工位处的卷针组件以卷绕阴极极片、阳极极片和隔膜，从而形成电极组件。
本申请提供的卷绕方法，在卷绕阴极极片、阳极极片和隔膜之前，第一半卷针和第二半卷针直接夹持入料的阴极极片、阳极极片和隔膜的头部，取代了在一些情形中先卷绕隔膜，再通过隔膜卷绕阴极极片和阳极极片，因此可以避免阴极极片和阳极极片在开始卷绕时发生打折，从而解决在一些情形下在对阴极极片、阳极极片和隔膜进行卷绕时，阴极极片和阳极极片的头部容易发生打折的问题。
在本申请的一些实施例中，卷绕方法还包括：在卷绕工位上游切断阴极极片；将卷针组件从卷绕工位移动到下游的非卷绕工位；将位于非卷绕工位的另一卷针组件移动到 卷绕工位；位于卷绕工位的另一卷针组件夹持用于形成下一个电极组件的阴极极片、阳极极片和隔膜的头部；在卷绕工位和非卷绕工位之间切断阳极极片和隔膜。
本申请实施例提供的方案中，在卷绕阴极极片、阳极极片和隔膜的同时，先切断阴极极片，在阴极极片完全卷绕、仅留有阳极极片和隔膜时，再切断阳极极片和隔膜。这样，不用每次卷绕一个电极组件时，将阴极极片、阳极极片和隔膜的头部送入第一半卷针和第二半卷针中间，卷绕工位的第一半卷针和第二半卷针只需夹持切断前的阳极极片和隔膜，然后在卷绕工位和非卷绕工位之间切断阳极极片和隔膜，不用多次送料，提高了卷绕效率。
在本申请的一些实施例中，卷绕方法还包括：将切断后的阴极极片的头部送入位于卷绕工位的另一卷针组件的第一半卷针和第二半卷针之间。通过将切断后的阴极极片头部置于第一半卷针和第二半卷针之间，便可以对阴极极片、阳极极片和隔膜的头部进行夹持并卷绕，以形成下一个电极组件。
在本申请的一些实施例中，卷绕方法还包括：在卷绕工位上游，夹持送料机构将阴极极片、阳极极片和隔膜的头部共同夹持并送入第一半卷针和第二半卷针之间。通过夹持送料机构，可以将阴极极片、阳极极片和隔膜的头部顺利引导至卷绕机构的第一半卷针和第二半卷针之间。
在本申请的一些实施例中，卷绕方法还包括，在阴极极片、阳极极片和隔膜的头部进入第一半卷针和第二半卷针之间后，伸缩机构驱动夹持阴极极片、阳极极片和隔膜的夹持送料机构向第一方向偏移，阴极极片、阳极极片和隔膜的头部进入第一半卷针和第二半卷针之间的方向为第二方向，第一方向与第二方向相交。伸缩机构驱动夹持送料机构向第一方向偏移，能够使阴极极片、阳极极片和隔膜的头部回退并置于第一半卷针和第二半卷针之间，从而可以有效防止电极组件内部阳极极片堆积，提高电极组件的质量。
在本申请的一些实施例中，将阴极极片、阳极极片和隔膜的头部夹设于在卷绕工位处的卷针组件的第一半卷针和第二半卷针之间的步骤之前，卷绕方法还包括，将阴极极片、阳极极片和隔膜复合。通过将阴极极片、阳极极片和隔膜复合，可以有效地将阴极极片、阳极极片与隔膜固定在一起，使得阴极极片、阳极极片和隔膜的头部更加容易进入第一半卷针和第二半卷针之间。
第二方面，本申请实施例提供一种卷绕机，包括：卷绕机构，包括卷针组件，卷针组件用于卷绕阴极极片、阳极极片和隔膜，以形成电极组件，卷针组件包括第一半卷针 和第二半卷针，第一半卷针和第二半卷针被配置为可相对运动，以夹持阴极极片、阳极极片和隔膜的头部。
本申请实施例提供的卷绕机中，卷针组件包括可相对运动的第一半卷针和第二半卷针。该卷绕机在卷绕阴极极片、阳极极片和隔膜之前，第一半卷针和第二半卷针直接夹持入料的阴极极片、阳极极片和隔膜的头部，取代了在一些情形中先卷绕隔膜，再通过隔膜卷绕阴极极片和阳极极片，因此可以避免阴极极片和阳极极片在开始卷绕时发生打折，从而解决在一些情形下在对阴极极片、阳极极片和隔膜进行卷绕时，阴极极片和阳极极片的头部容易发生打折的问题。
在本申请的一些实施例中，还包括：夹持送料机构，设置于卷绕机构上游，用于将阴极极片、阳极极片和隔膜的头部夹持送入第一半卷针和第二半卷针之间。通过在卷绕机构的上游设置夹持送料机构，可以将阴极极片、阳极极片和隔膜的头部顺利引导至卷绕机构的第一半卷针和第二半卷针之间。
在本申请的一些实施例中，夹持送料机构包括第一夹辊、第二夹辊和驱动机构，第一夹辊和第二夹辊被配置为可相对运动以夹持阴极极片、阳极极片和隔膜，第一夹辊和/或第二夹辊与驱动机构连接，以输送阴极极片、阳极极片和隔膜。通过驱动机构带动第一夹辊和/或第二夹辊转动，可以方便的实现对阴极极片、阳极极片和隔膜的牵引驱动，避免对阴极极片、阳极极片和隔膜牵拉，造成损伤的问题。
在本申请的一些实施例中，还包括：伸缩机构，伸缩机构与夹持送料机构相连，用于在阴极极片、阳极极片和隔膜进入第一半卷针和第二半卷针之后，驱动夹持送料机构沿第一方向移动；其中，阴极极片、阳极极片和隔膜的进入第一半卷针和第二半卷针之间的方向为第二方向，第一方向与第二方向相交。
本申请实施例通过伸缩机构驱动夹持送料机构向第一方向偏移，能够使阴极极片、阳极极片和隔膜的头部回退并置于第一半卷针和第二半卷针之间，从而可以有效防止电极组件内部阳极极片堆积，提高电极组件的质量。
在本申请的一些实施例中，卷绕机还包括：第一切刀，用于切断阴极极片，第一切刀设置于卷绕机构的上游。
本申请实施例在卷绕机构的上游设置第一切刀，可以在阴极极片被放卷至预设长度时，及时的切断阴极极片。
在本申请的一些实施例中，卷绕机构还包括转塔，转塔上设置有多个卷针组件，转塔用于将多个卷针组件在卷绕工位和非卷绕工位之间切换，在卷绕工位的卷针组件用于 卷绕阴极极片、阳极极片和隔膜以形成电极组件。通过转塔使卷针组件在卷绕工位和非卷绕工位之间的切换，能够实现电极组件的连续、不间断的生产。
在本申请的一些实施例中，卷绕机还包括第二切刀，第二切刀用于切断阳极极片和隔膜，第二切刀设置于卷绕工位和非卷绕工位之间。通过在卷绕工位和非卷绕工位之间设置第二切刀，可以在切断的阴极极片被完全卷入隔膜之后，同时切断阳极极片和隔膜。
在本申请的一些实施例中，卷绕机还包括导向辊，导向辊位于卷绕工位和非卷绕工位之间；其中，阴极极片、阳极极片和隔膜的进入第一半卷针和第二半卷针之间的方向为第二方向，导向辊与第二方向相切。通过设置与第二方向相切的导向辊，可使位于卷绕工位的卷针组件顺利伸出并夹持阴极极片、阳极极片和隔膜。
在本申请的一些实施例中，第一半卷针包括第一平面；第二半卷针包括第二平面；第一平面和第二平面为夹持阴极极片、阳极极片和隔膜的平面；第一平面或第二平面的端部形成有缺口。
通过在第一平面或第二平面的端部形成缺口，使得阳极极片和隔膜在第一平面和第二平面之间的路径变长，从而可以使切断的阳极极片和隔膜的头部回收进入卷针组件，，从而使阴极极片、阳极极片和隔膜位于第一半卷针和第二半卷针内部，避免阴极极片、阳极极片和隔膜卷绕在第一半卷针或第二半卷针的外圆周，防止电极组件内部阳极极片堆积，提高电极组件的质量。
第三方面，本申请实施例还提供一种电极组件，电极组件采用上述第一方面任一的卷绕方法制作而成。
本申请实施例提供的电池单体的电极组件可以通过上述实施例中的卷绕方法制作而成。该电池单体中，阴极极片和阳极极片的头部平整，电池单体具有工作稳定，使用安全、可靠的优点。
在本申请的一些实施例中，电极组件包括：阴极极片、阳极极片和隔膜，阳极极片的头部与隔膜的头部平齐。
在本申请的一些实施例中，阳极极片的尾部与隔膜的尾部平齐。由于阳极极片与隔膜的头部、尾部均平齐，电极组件中的隔膜相较于相关技术电极组件显著变短，因此有效减小了不参加电极反应的隔膜的长度，提高了电池单体的能量密度。
第四方面，本申请实施例还提供一种电池单体，包括上述第三方面任一的电极组件。
本申请提供的电池单体，由于具有上述第三方面的电极组件，因此具有上述第三方面的电极组件所具有的所有有益效果。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。在附图中，除非另外规定，否则贯穿多个附图相同的附图标记表示相同或相似的部件或元素。这些附图不一定是按照比例绘制的。应该理解，这些附图仅描绘了根据本申请公开的一些实施方式，而不应将其视为是对本申请范围的限制。
图1为本申请实施例提供的一种卷绕方法的流程图；
图2为本申请实施例提供的另一种卷绕方法的流程图；
图3为本申请实施例提供的一种卷绕机夹持阴极极片、阳极极片和隔膜头部时的结构示意图；
图4为本申请实施例提供的一种卷绕机在切断阳极极片和隔膜并卷绕阴极极片、阳极极片和隔膜时的结构示意图；
图5为图3卷绕机中一种卷针组件的结构示意图；
图6为图3卷绕机中另一种卷针组件的结构示意图；
图7为本申请实施例提供的一种电极组件的结构示意图。
具体实施方式中的附图标号如下：
1—电极组件，11—阴极极片，12—阳极极片，13—隔膜；
2—卷绕机构；
21—卷针组件，211—第一半卷针，212—第二半卷针，213—弧形曲面，214—第一平面，215—第二平面，216—凹槽，217—第三平面，218—缺口，219—第四平面，220—第五平面；
22—转塔，221—卷绕工位，222—非卷绕工位；
3—夹持送料机构，31—第一夹辊，32—第二夹辊；
4—第一切刀；5—第二切刀；
6—导向辊；
7—贴收尾胶机构；8—下料机构；
L—第一方向；M—第二方向。
具体实施方式
下面将结合附图对本申请技术方案的实施例进行详细的描述。以下实施例仅用于更加清楚地说明本申请的技术方案，因此只作为示例，而不能以此来限制本申请的保护范围。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本文中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。
在本申请实施例的描述中，技术术语“第一”“第二”等仅用于区别不同对象，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量、特定顺序或主次关系。在本申请实施例的描述中，“多个”的含义是两个以上，除非另有明确具体的限定。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请实施例的描述中，术语“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请实施例的描述中，术语“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
在本申请实施例的描述中，技术术语“中心”“纵向”“横向”“长度”“宽度”“厚度”“上”“下”“前”“后”“左”“右”“竖直”“水平”“顶”“底”“内”“外”“顺时针”“逆时针”“轴向”“径向”“周向”等指示的方位或位置关系为基于 附图所示的方位或位置关系，仅是为了便于描述本申请实施例和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请实施例的限制。
在本申请实施例的描述中，除非另有明确的规定和限定，技术术语“安装”“相连”“连接”“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；也可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请实施例中的具体含义。
在一些情形中，在卷绕电极组件时，通常先利用卷针组件夹持隔膜头部并卷绕若干圈后，再使阴极极片和阳极极片的头部进入两层隔膜之间，通过两个隔膜夹持阴极极片和阳极极片进行卷绕，而阴极极片和阳极极片的头部在进入两层隔膜时，容易与卷针组件碰撞，从而发生阴极极片和阳极极片的头部打折的问题。
为了解决该问题，申请人尝试采用了吹气机构、导向机构、吸附机构等多种结构，以改善阴极极片及阳极极片的头部与卷针组件的碰撞，但是均不能很好的解决上述问题。
申请人通过进一步研究，在本申请中提出一种卷绕方法、卷绕机、电机组件及电池单体，该方案采用卷针组件同时夹持阴极极片、阳极极片和隔膜的头部进行卷绕，使得阴极阳极和隔膜头部不会与卷针组件外周接触，从而解决了阴极极片及阳极极片的头部与卷针组件发生碰撞而出现打折的问题。
下面首先结合附图，对本申请实施例提供的一种卷绕方法进行说明。
请参照图1，图1为本申请实施例提供的一种卷绕方法的流程图。本申请实施例提供的一种卷绕方法，用于卷绕阴极极片11、阳极极片12和隔膜13以形成电极组件1。该方法应用于卷绕机。卷绕机包括可伸缩运动的卷针组件21。卷针组件21包括可相对运动的第一半卷针211和第二半卷针212。
如图1所示，该卷绕方法可以包括如下步骤：
S101，将阴极极片11、阳极极片12和隔膜13的头部夹设于在卷绕工位221处的卷针组件21的第一半卷针211和第二半卷针212之间。
其中，在卷绕阴极极片11、阳极极片12和隔膜13之前，第一半卷针211和第二半卷针212直接夹持入料的阴极极片11、阳极极片12和隔膜13的头部。
S102，旋转在卷绕工位221处的卷针组件21以卷绕阴极极片11、阳极极片12和隔膜13，从而形成电极组件1。
其中，卷针组件21的旋转方向可以为顺时针旋转，也可以为逆时针旋转。具体的旋转方向根据实际需要而定，本申请对此不作具体限定。
本申请提供的卷绕方法，在卷绕阴极极片11、阳极极片12和隔膜13之前，第一半卷针211和第二半卷针212直接夹持入料的阴极极片11、阳极极片12和隔膜13的头部，取代了在一些情形中先卷绕隔膜13，再通过隔膜13卷绕阴极极片11和阳极极片12，因此可以避免阴极极片11和阳极极片12在开始卷绕时发生打折，从而解决在一些情形下在对阴极极片11、阳极极片12和隔膜13进行卷绕时，阴极极片11和阳极极片12的头部容易发生打折的问题。
请参照图2，图2为本申请实施例提供的另一种卷绕方法的流程图。本申请实施例还提供另一种卷绕方法，该卷绕方法包括：
S201，将阴极极片11、阳极极片12和隔膜13的头部夹设于在卷绕工位221处的卷针组件21的第一半卷针211和第二半卷针212之间。
S202，旋转在卷绕工位221处的卷针组件21以卷绕阴极极片11、阳极极片12和隔膜13。
本申请实施例中，S201～S202可与上述实施例中S101～S102的步骤相同，在此不再赘述。
S203，在卷绕工位221上游切断阴极极片11。
S204，将卷针组件21从卷绕工位221移动到下游的非卷绕工位222。
其中，上、下游是指阴极极片11、阳极极片12和隔膜13相对于卷绕工位221的来料和去料方向，其与卷绕工位221本身的位置并没有关系。
需要说明的是，S204移动卷针组件21的步骤可以与上述S203切断阴极极片11的步骤同时进行，也可以在上述S203切断阴极极片11的步骤之前或之后进行。具体选择哪种方式，可以根据阴极极片11的实际长度确定。
可以理解的是，通过将卷绕工位221的卷针组件21移动到下游的非卷绕工位222，可以为下一电极组件1的卷绕提前做好准备，从而使电极组件1的生产节奏保持连续。
S205，将位于非卷绕工位222的另一卷针组件21移动到卷绕工位221。
需要说明的是，S205移动非卷绕工位222的另一卷针组件21的步骤可以与S204移动卷针组件21的步骤同时进行，也可以在S204移动卷针组件21的步骤之前或之后，本申请实施例对此并不做具体限定。
S206，位于卷绕工位221的另一卷针组件21夹持用于形成下一个电极组件1的阴极极片11、阳极极片12和隔膜13的头部。
其中，当位于非卷绕工位222的另一卷针组件21移动到卷绕工位221之后，该另一卷针组件21可以伸出并夹持用于形成下一个电极组件1的阴极极片11、阳极极片12和隔膜13的头部。
S207，在卷绕工位221和非卷绕工位222之间切断阳极极片12和隔膜13。
在切断阳极极片12和隔膜13之后，便重复上述步骤继续对下一个电极组件1进行夹持和卷绕。在先的电极组件1则进入后续贴收尾胶和下料的步骤，由于贴收尾胶和下料属于本领域公知常识，在此不进行赘述。
本申请实施例提供的方案中，在卷绕阴极极片11、阳极极片12和隔膜13的同时，先切断阴极极片11，在阴极极片11完全卷绕、仅留有阳极极片12和隔膜13时，再切断阳极极片12和隔膜13。这样，不用每次卷绕一个电极组件1时，将阴极极片11、阳极极片12和隔膜13的头部送入第一半卷针211和第二半卷针212中间，卷绕工位221的第一半卷针211和第二半卷针212只需夹持切断前的阳极极片12和隔膜13，然后在卷绕工位221和非卷绕工位222之间切断阳极极片12和隔膜13，不用多次送料，提高了卷绕效率。
在本申请的一些实施例中，在上述实施例的步骤S203之后，该卷绕方法还可以包括如下步骤：
将切断后的阴极极片11的头部送入位于卷绕工位221的另一卷针组件21的第一半卷针211和第二半卷针212之间。
可以理解的是，将切断后的阴极极片11的头部置于第一半卷针211和第二半卷针212之间，便可以通过上述实施例的步骤S206中对阴极极片11、阳极极片12和隔膜13的头部进行夹持并卷绕，以形成下一个电极组件1。
在本申请的一些实施例中，上述卷绕方法实施例中还包括如下步骤：
在卷绕工位221上游，夹持送料机构3将阴极极片11、阳极极片12和隔膜13的头部共同夹持并送入第一半卷针211和第二半卷针212之间。
本申请实施例中，可以采用夹持送料机构3驱动阴极极片11、阳极极片12和隔膜13进入卷绕机构2。通过夹持送料机构3，可以将阴极极片11、阳极极片12和隔膜13的头部顺利引导至卷绕机构2的第一半卷针211和第二半卷针212之间。为了布局清晰，夹持送料机构3的具体结构在下文装置实施例中具体说明。
在本申请的一些实施例中，上述卷绕方法实施例中还可以包括如下步骤：
在阴极极片11、阳极极片12和隔膜13的头部进入第一半卷针211和第二半卷针212之间后，伸缩机构驱动夹持阴极极片11、阳极极片12和隔膜13的夹持送料机构3向第一方向L偏移，阴极极片11、阳极极片12和隔膜13的头部进入第一半卷针211和第二半卷针212之间的方向为第二方向M，第一方向L与第二方向M相交。
本申请实施例中，伸缩机构驱动夹持送料机构3向第一方向L偏移，能够使阴极极片11、阳极极片12和隔膜13的头部回退并置于第一半卷针211和第二半卷针212之间，从而可以有效防止电极组件1内部阳极极片12堆积，提高电极组件1的质量。其中，伸缩机构可以为气缸、油缸、滚珠丝杠等，实际应用中可根据实际需要灵活选择。
在本申请的一些实施例中，上述卷绕方法实施例中，在将阴极极片11、阳极极片12和隔膜13的头部夹设于在卷绕工位221处的卷针组件21的第一半卷针211和第二半卷针212之间的步骤之前，可以包括如下步骤：
将阴极极片11、阳极极片12和隔膜13复合。
本申请实施例提供的方案，在将阴极极片11、阳极极片12和隔膜13的头部夹设在卷针组件21之前，还可以对阴极极片11、阳极极片12和隔膜13进行复合。复合方式包括但不限于加热复合或通过在隔膜13上添加粘结剂的方式冷复合。其中，阳极极片12和隔膜13的复合可以在卷绕机内部完成，也可在卷绕机外部完成后再通过卷绕机进行卷绕。
本申请实施例通过将阴极极片11、阳极极片12和隔膜13复合，可有效地将阴极极片11、阳极极片12与隔膜13固定在一起，使得阴极极片11、阳极极片12和隔膜13的头部更加容易进入第一半卷针211和第二半卷针212之间。
请参照图3和图4，图3为本申请实施例提供的一种卷绕机夹持阴极极片、阳极极片和隔膜头部时的结构示意图；图4为本申请实施例提供的一种卷绕机在切断阳极极片和隔膜并卷绕阴极极片、阳极极片和隔膜时的结构示意图。
如图3和图4所示，本申请实施例还提供了一种卷绕机，该卷绕机包括：
卷绕机构2，包括卷针组件21，卷针组件21用于卷绕阴极极片11、阳极极片12和隔膜13，以形成电极组件1，卷针组件21包括第一半卷针211和第二半卷针212，第一半卷针211和第二半卷针212被配置为可相对运动，以夹持阴极极片11、阳极极片12和隔膜13的头部。
其中，卷针组件21的结构可以有多种，例如可以是柱状结构、块状结构等；该柱状结构、块状结构可以由第一半卷针211、第二半卷针212拼接而成。第一半卷针211、第二半卷针212的结构在下文中将详细说明，在此不进行赘述。此外，第一半卷针211和第二半卷针212均可以在阴极极片11或阳极极片12的宽度方向(如图3和图4中垂直纸面的方向)伸缩，以夹持阴极极片11、阳极极片12和隔膜13。
本申请实施例提供的卷绕机中，卷针组件21包括可相对运动的第一半卷针211和第二半卷针212。该卷绕机在卷绕阴极极片11、阳极极片12和隔膜13之前，第一半卷针211和第二半卷针212直接夹持入料的阴极极片11、阳极极片12和隔膜13的头部，取代了在一些情形中先卷绕隔膜13，再通过隔膜13卷绕阴极极片11和阳极极片12，因此可以避免阴极极片11和阳极极片12在开始卷绕时发生打折，从而解决在一些情形下在对阴极极片11、阳极极片12和隔膜13进行卷绕时，阴极极片11和阳极极片12的头部容易发生打折的问题。
在本申请的一些实施例中，卷绕机还可以包括：夹持送料机构3，设置于卷绕机构2上游，用于将阴极极片11、阳极极片12和隔膜13的头部夹持送入第一半卷针211和第二半卷针212之间。
本申请实施例通过在卷绕机构2的上游设置夹持送料机构3，可以将阴极极片11、阳极极片12和隔膜13的头部顺利引导至卷绕机构2的第一半卷针211和第二半卷针212之间。
在本申请的一些实施例中，夹持送料机构3包括第一夹辊31、第二夹辊32和驱动机构，第一夹辊31和第二夹辊32被配置为可相对运动以夹持阴极极片11、阳极极片12和隔膜13，第一夹辊31和/或第二夹辊32与驱动机构连接，以输送阴极极片11、阳极极片12和隔膜13。
本申请实施例通过驱动机构带动第一夹辊31和/或第二夹辊32转动，可以方便的实现对阴极极片11、阳极极片12和隔膜13的牵引驱动，避免对阴极极片11、阳极极片12和隔膜13牵拉，造成损伤的问题。
此外，由于夹持送料机构3通过驱动机构主动地将阴极极片11、阳极极片12和隔膜13的头部夹持送入卷绕机构2，即夹持送料机构3提供牵引力，驱动阴极极片11、阳极极片12和隔膜13运动，可以使将阴极极片11、阳极极片12和隔膜13受力更加均衡，避免阴极极片11、阳极极片12和隔膜13发生过大的变形。
在本申请的一些实施例中，卷绕机还可以包括：伸缩机构，伸缩机构与夹持送料机构3相连，用于在阴极极片11、阳极极片12和隔膜13进入第一半卷针211和第二半卷针212之后，驱动夹持送料机构3沿第一方向L移动；其中，阴极极片11、阳极极片12和隔膜13的进入第一半卷针211和第二半卷针212之间的方向为第二方向M，第一方向L与第二方向M相交。
本申请实施例提供的夹持送料机构3本身不仅可以驱动阴极极片11、阳极极片12和隔膜13运动，而且夹持送料机构3在伸缩机构的带动下也可以发生运动。具体而言，与夹持送料机构3相连的伸缩机构可以推动或拉动夹持送料机构3沿第一方向L移动。其中，第一方向L与阴极极片11和隔膜13进入第一半卷针211和第二半卷针212之间的第二方向M相交。第一方向L和第二方向M之间的夹角可以为钝角、锐角，也可以为直角。
本申请实施例通过伸缩机构驱动夹持送料机构3向第一方向L偏移，能够使阴极极片11、阳极极片12和隔膜13的头部回退并置于第一半卷针211和第二半卷针212之间，从而可以有效防止电极组件1内部阳极极片12堆积，提高电极组件1的质量。
在本申请的一些实施例中，卷绕机还可以包括：第一切刀4，用于切断阴极极片11，第一切刀4设置于卷绕机构2的上游。
本申请实施例在卷绕机构2的上游设置第一切刀4，可以在阴极极片11被放卷至预设长度时，及时的切断阴极极片11。
在本申请的一些实施例中，卷绕机构2还可以包括转塔22，转塔22上设置有多个卷针组件21，转塔22用于将多个卷针组件21在卷绕工位221和非卷绕工位222之间切换，在卷绕工位221的卷针组件21用于卷绕阴极极片11、阳极极片12和隔膜13以形成电极组件1。
其中，卷绕机构2的转塔22可以通过自身的转动使多个卷针组件21在卷绕工位221和非卷绕工位222之间切换。多个卷针组件21可以呈环形阵列设置于转塔22上。卷针组件21相对于转塔22伸缩运动和转动，可以实现对阴极极片11、阳极极片12和隔膜13的夹持、释放及卷绕。
非卷绕工位222的数量至少为一个。当非卷绕工位222仅为一个时，该非卷绕工位222可同时用于对电极组件1贴收尾胶以及下料。当非卷绕工位222为两个以上时，可以在一个非卷绕工位222对电极组件1贴收尾胶，在另一个非卷绕工位222对电极组件1进行下料。
本申请实施例中，通过转塔22使卷针组件21在卷绕工位221和非卷绕工位222之间的切换，能够实现电极组件1的连续、不间断的生产。
在本申请的一些实施例中，卷绕机还可以包括第二切刀5，第二切刀5用于切断阳极极片12和隔膜13，第二切刀5设置于卷绕工位221和非卷绕工位222之间。
本申请实施例在卷绕工位221和非卷绕工位222之间设置第二切刀5，可以在切断的阴极极片11被完全卷入隔膜13之后，同时切断阳极极片12和隔膜13。
在采用第二切刀5进行切断时，可以通过一次用刀即同时切断阳极极片12和隔膜13，而不用分两次分别切断阳极极片12和隔膜13；并且切断后的阳极极片12和隔膜13的头部在卷绕下一个电极组件1时被卷针组件21夹持，不用再次进行入料动作，因此可以进一步提高卷绕效率。
在本申请的一些实施例中，卷绕机还可以包括导向辊6，导向辊6位于卷绕工位221和非卷绕工位222之间；其中，阴极极片11、阳极极片12和隔膜13的进入第一半卷针211和第二半卷针212之间的方向为第二方向M，导向辊6与第二方向M相切。
本申请实施例通过设置与第二方向M相切的导向辊6，可使位于卷绕工位221的卷针组件21顺利伸出并夹持阴极极片11、阳极极片12和隔膜13。
在本申请的一些实施例中，如图5和图6所示，第一半卷针211包括第一平面214；第二半卷针212包括第二平面215；第一平面214和第二平面215为夹持阴极极片11、阳极极片12和隔膜13的平面；第一平面214或第二平面215的端部形成有缺口218。
可以通过截取第一半卷针211或第二半卷针212的一部分结构，获得缺口218。在本申请中第一半卷针211和第二半卷针212的截面形状根据实际需要进行设计，例如可以是如图5所示的半圆形，也可以是如图6所示的半菱形。如图5所示，当第一半卷针211或第二半卷针212的横截面为半圆形时，去除一部分结构后，该半圆形可以包括弧形曲面213、第一平面214和连接弧形曲面213和第一平面214的第三平面217；其中第三平面217与第一平面214的夹角为钝角；弧形曲面213的弧度小于π弧度。又如图6所示，当第一半卷针211或第二半卷针212的横截面为三角形时，去除一部分结构后，该三角形可以包括第一平面214、第四平面219、第五平面220和连接第五平面220与第一平面214的第三平面217。
此外，第一半卷针211和第二半卷针212的外圆周还设有凹槽216，该凹槽216用于夹持电极组件1，实现电极组件1的下料。
本申请实施例中，通过在第一平面214或第二平面215的端部形成缺口218，使得阳极极片12和隔膜13在第一平面214和第二平面215之间的路径变长，从而可以使切断的阳极极片12和隔膜13的头部回收进入卷针组件21，从而使阴极极片11、阳极极片12和隔膜13位于第一半卷针211和第二半卷针212内部，避免阴极极片11、阳极极片12和隔膜13卷绕在第一半卷针211或第二半卷针212的外圆周，防止电极组件1内部阳极极片12堆积，提高电极组件1的质量。
为了对卷绕完成的电极组件1进行贴收尾胶和下料，如图3和图4所示，本申请实施例提供的卷绕机还可以包括设置在非卷绕工位222的贴收尾胶机构7和下料机构8，由于贴收尾胶机构7和下料机构8属于本领域公知常识，在此不进行详细说明。
此外，参见图7，本申请实施例还提供一种电极组件1，该电极组件1采用上述任一的卷绕方法制作而成。
本申请实施例提供的电池单体的电极组件1可以通过上述实施例中的卷绕方法制作而成。可以理解的是，由于上述实施例的方法在开始卷绕之前，先将阴极极片11、阳极极片12和隔膜13的头部夹设于在卷绕工位221处的卷针组件21的第一半卷针211和第二半卷针212之间，因此通过该方法制作的阴极极片11、阳极极片12和隔膜13位于电极组件1的最内圈。
本申请实施例提供的电池单体中，阴极极片11和阳极极片12的头部平整，电池单体具有工作稳定，使用安全、可靠的优点。
在本申请的一些实施例中，阳极极片12的头部与隔膜13的头部平齐。
在本申请的一些实施例中，阳极极片12的尾部与隔膜13的尾部平齐。
其中，电极组件1由阴极极片11、阳极极片12和隔膜13叠加卷绕而成。根据卷绕的方向不同，可以将阳极极片12置于阴极极片11和隔膜13的最上层或最下层。需要说明的是，针对上述阳极极片12的不同位置，可以采用相应卷绕方向进行卷绕，从而获得的电极组件1中阳极极片12位于电极组件1的最内层。
由于在一些情形中在卷绕电极组件时，通过是先卷绕隔膜13，然后再卷绕阴极极片11和阳极极片12，因此，在一些情形中电极组件均具有多圈隔膜13，该多圈隔膜13并不参加电极反应。与相关技术中电极组件相比，参见图7，本申请实施例中由于阳极极片12与隔膜13的头部、尾部平齐，电极组件1中的隔膜13相较于相关技术中电极组件显著变短，因此有效减小了不参加电极反应的隔膜13的长度，提高了电池单体的能量密度。
最后，本申请实施例还提供一种电池单体，包括上述任一的电极组件1。
本申请提供的电池单体，由于具有上述电极组件1，因此具有上述电极组件1所具有的所有有益效果。
在本申请的一些实施例中，隔膜13的数量为两个；阴极极片11夹设在两个隔膜13之间。
本申请实施例中，阴极极片11夹设在两个隔膜13之间，可以使阴极极片11得到两侧隔膜13的保护，改善了阴极极片11头部出现打折的情况。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围，其均应涵盖在本申请的权利要求和说明书的范围当中。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (19)

  1. 一种卷绕方法，用于卷绕阴极极片(11)、阳极极片(12)和隔膜(13)以形成电极组件(1)，其中，所述卷绕方法包括：
    将所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)的头部夹设于在卷绕工位(221)处的卷针组件(21)的第一半卷针(211)和第二半卷针(212)之间；
    旋转在所述卷绕工位(221)处的所述卷针组件(21)以卷绕所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)，从而形成所述电极组件(1)。
  2. 根据权利要求1所述的卷绕方法，其中，所述卷绕方法还包括，
    在所述卷绕工位(221)上游切断所述阴极极片(11)；
    将所述卷针组件(21)从所述卷绕工位(221)移动到下游的非卷绕工位(222)；
    将位于非卷绕工位(222)的另一卷针组件(21)移动到所述卷绕工位(221)；
    位于所述卷绕工位(221)的所述另一卷针组件(21)夹持用于形成下一个所述电极组件(1)的所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)的头部；
    在所述卷绕工位(221)和所述非卷绕工位(222)之间切断所述阳极极片(12)和所述隔膜(13)。
  3. 根据权利要求2所述的卷绕方法，其中，所述卷绕方法还包括，
    将切断后的所述阴极极片(11)的头部送入位于所述卷绕工位(221)的所述另一卷针组件(21)的所述第一半卷针(211)和所述第二半卷针(212)之间。
  4. 根据权利要求1至3任一项所述的卷绕方法，其中，所述卷绕方法还包括，
    在所述卷绕工位(221)上游，夹持送料机构(3)将所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)的头部共同夹持并送入所述第一半卷针(211)和所述第二半卷针(212)之间。
  5. 根据权利要求4所述的卷绕方法，其中，所述卷绕方法还包括，
    在所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)的头部进入所述第一半卷针(211)和所述第二半卷针(212)之间后，伸缩机构驱动夹持所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)的夹持送料机构(3)向第一方向(L)偏移，所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)的头部进入所述第一半卷针(211)和所述第二半卷针(212)之间的方向为第二方向(M)，所述第一方向(L)与所述第二方向(M)相交。
  6. 根据权利要求1至5中任一项所述的卷绕方法，其中，将所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)的头部夹设于在卷绕工位(221)处的卷针组件(21)的第一半卷针(211)和第二半卷针(212)之间的步骤之前，所述卷绕方法还包括，
    将所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)复合。
  7. 一种卷绕机，其中，包括：
    卷绕机构(2)，包括卷针组件(21)，所述卷针组件(21)用于卷绕阴极极片(11)、阳极极片(12)和隔膜(13)，以形成电极组件(1)，所述卷针组件(21)包括第一半卷针(211)和第二半卷针(212)，所述第一半卷针(211)和所述第二半卷针(212)被配置为可相对运动，以夹持所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)的头部。
  8. 根据权利要求7所述的卷绕机，其中，还包括：
    夹持送料机构(3)，设置于所述卷绕机构(2)上游，用于将所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)的头部夹持送入所述第一半卷针(211)和所述第二半卷针(212)之间。
  9. 根据权利要求8所述的卷绕机，其中，所述夹持送料机构(3)包括第一夹辊(31)、第二夹辊(32)和驱动机构，所述第一夹辊(31)和所述第二夹辊(32)被配置为可相对运动以夹持所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)，所述第一夹辊(31)和/或所述第二夹辊(32)与所述驱动机构连接，以输送所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)。
  10. 根据权利要求8或9所述的卷绕机，其中，还包括：
    伸缩机构，所述伸缩机构与所述夹持送料机构(3)相连，用于在所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)进入所述第一半卷针(211)和所述第二半卷针(212)之后，驱动所述夹持送料机构(3)沿第一方向(L)移动；其中，所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)的进入所述第一半卷针(211)和所述第二半卷针(212)之间的方向为第二方向(M)，所述第一方向(L)与所述第二方向(M)相交。
  11. 根据权利要求7至10任一项所述的卷绕机，其中，所述卷绕机还包括：
    第一切刀(4)，用于切断所述阴极极片(11)，所述第一切刀(4)设置于所述卷绕机构(2)的上游。
  12. 根据权利要求7至11任一项所述的卷绕机，其中，所述卷绕机构(2)还包括转塔(22)，所述转塔(22)上设置有多个所述卷针组件(21)，所述转塔(22)用于将多 个所述卷针组件(21)在卷绕工位(221)和非卷绕工位(222)之间切换，在所述卷绕工位(221)的所述卷针组件(21)用于卷绕所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)以形成所述电极组件(1)。
  13. 根据权利要求12所述的卷绕机，其中，所述卷绕机还包括第二切刀(5)，所述第二切刀(5)用于切断所述阳极极片(12)和所述隔膜(13)，所述第二切刀(5)设置于所述卷绕工位(221)和所述非卷绕工位(222)之间。
  14. 根据权利要求12或13所述卷绕机，其中，所述卷绕机还包括导向辊(6)，所述导向辊(6)位于所述卷绕工位(221)和所述非卷绕工位(222)之间；其中，所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)的进入所述第一半卷针(211)和所述第二半卷针(212)之间的方向为第二方向(M)，所述导向辊(6)与所述第二方向(M)相切。
  15. 根据权利要求7至14任一项所述卷绕机，其中，所述第一半卷针(211)包括第一平面(214)；所述第二半卷针(212)包括第二平面(215)；所述第一平面(214)和所述第二平面(215)为夹持所述阴极极片(11)、所述阳极极片(12)和所述隔膜(13)的平面；
    所述第一平面(214)或所述第二平面(215)的端部形成有缺口(218)。
  16. 一种电极组件，其中，所述电极组件采用权利要求1～6任一所述的卷绕方法制作而成。
  17. 根据权利要求16所述的电极组件，其中，包括：
    阴极极片(11)、阳极极片(12)和隔膜(13)，所述阳极极片(12)的头部与所述隔膜(13)的头部平齐。
  18. 根据权利要求16或17所述的电极组件，其中，所述阳极极片(12)的尾部与所述隔膜(13)的尾部平齐。
  19. 一种电池单体，其中，包括权利要求16-18任一所述的电极组件。
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