WO2023142897A1 - 卷绕设备以及卷绕方法 - Google Patents

卷绕设备以及卷绕方法 Download PDF

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Publication number
WO2023142897A1
WO2023142897A1 PCT/CN2022/144243 CN2022144243W WO2023142897A1 WO 2023142897 A1 WO2023142897 A1 WO 2023142897A1 CN 2022144243 W CN2022144243 W CN 2022144243W WO 2023142897 A1 WO2023142897 A1 WO 2023142897A1
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WIPO (PCT)
Prior art keywords
winding
isolation film
electrode assembly
traction
section
Prior art date
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PCT/CN2022/144243
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English (en)
French (fr)
Inventor
郭锁刚
叶永煌
杨国众
付成华
张辰辰
Original Assignee
宁德时代新能源科技股份有限公司
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Publication of WO2023142897A1 publication Critical patent/WO2023142897A1/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—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 technical field of battery manufacturing, and in particular, relates to a winding device and a winding method.
  • the wound electrode assembly is an important part inside the battery cell, and the safety performance of the electrode assembly plays a decisive role in the safety performance of the battery cell.
  • the structure of the electrode assembly is improved to improve the safety performance of the battery cell, there is currently no corresponding winding equipment, resulting in the impossibility of industrial production even after the structure of the electrode assembly is improved.
  • the present application proposes a winding device and a winding method for winding and forming an electrode assembly with high safety performance, which can realize the industrial production of the electrode assembly and improve the manufacturing efficiency of the electrode assembly.
  • the winding device includes: a winding component; a pulling mechanism configured to pass through the winding when the separator Pulling the passing section of the isolation film after winding the part, so that the length of the passing section reaches a preset value; wherein, the winding part is configured to reach the preset value when the length of the passing section reaches the preset value After the value is reached, the winding is started to form the electrode assembly.
  • the winding device of the embodiment of the present application includes a traction mechanism, which can pull the passing section of the isolation film to move so that the length of the exiting section reaches a preset value, and the exiting section of the isolation film is also involved in the winding part , so that the exit section of the separator and the separator newly entering the winding part are stacked so that the separator between the negative electrode sheet and the positive electrode sheet of the inner ring has a multi-layer separator, and when the lithium precipitation phenomenon occurs, the lithium branch The crystal is not easy to pierce the separator and cause the contact between the negative pole piece and the positive pole piece, thereby causing an internal short circuit of the electrode assembly.
  • the electrode assembly wound and formed by using the winding device has high safety performance, and the winding device can realize the industrial production of the electrode assembly and improve the manufacturing efficiency of the electrode assembly.
  • the traction mechanism includes a traction member and a driving member, the drive member is used to drive the traction member to move between the first position and the second position, and the traction member is configured to The threading segment is pulled during movement from the first position to the second position.
  • the pulling member pulls the passing section of the isolation membrane during the process of moving from the first position to the second position, so that the automatic pulling of the passing section of the isolation membrane can be realized so that it can reach default value.
  • the pulling member is configured to return from the second position to the first position after the winding member starts to wind, and in the process of returning to the first position Provide tension to the separator.
  • the traction member tensions the isolation membrane during the process of returning from the second position to the first position, so that the exiting section of the isolation film is tightly wound around the winding part without Wrinkles will occur, which improves the winding quality of the separator and makes the electrode assembly have better safety performance.
  • the pulling member is configured to return from the second position to the first position after the winding member starts to wind, and when returning to the first position, The barrier membrane is released.
  • the pulling member releases the separator when returning from the second position to the first position, and the winding part continues to wind to roll the remaining part of the exiting section of the separator into the winding part to shape the electrode assembly.
  • the traction member when the traction member is in the first position, the traction member is located below the winding member along the direction of gravity.
  • the traction member when the traction member is in the first position, it is located below the winding part. After the traction member returns to the first position and releases the isolation membrane, the remaining part of the passing-through section of the isolation membrane naturally sags along the direction of gravity, isolating The remaining part of the exit section of the membrane enters the winding part smoothly without wrinkles, which improves the winding quality of the separator and makes the electrode assembly have better safety performance.
  • the moving direction of the traction member intersects with the gravity direction.
  • the traction member moves along the direction intersecting with the direction of gravity, which can make the path of the traction member moving between the first position and the second position intersect with the direction of gravity, thereby reducing the force of the traction member in the direction of gravity during the moving process. Occupies less space and can have a longer travel range.
  • the pulling member includes a pair of first clamping portions, and the pair of first clamping portions are used to clamp the end portion of the isolation membrane.
  • a pair of clamping parts are used to clamp the end of the isolation membrane, so that the piercing section of the isolation membrane can be reliably pulled to move, so that the piercing section of the isolation membrane can be reliably pulled out to a preset length.
  • the winding device further includes: a fixing member for fixing the end of the separator, and the fixing member is configured to releasing the end of the isolation membrane; wherein the pulling member is configured to push a portion of the isolation membrane between the fixing member and the winding component.
  • the fixing piece fixes the end of the isolation membrane, and the traction piece pushes the part of the isolation membrane between the fixing piece and the winding part, and pulls out the passing section of the isolation membrane to a preset length, which can shorten the pulling time.
  • the length of the stroke when the pulling member moves between the first position and the second position reduces the space occupied by the pulling member during movement.
  • the fixing part releases the end of the separator when the pulling member returns to the first position, and the winding part continues to wind to roll the remaining part of the passing-out section of the separator into the winding part to shape the electrode assembly.
  • the fixing member includes a pair of second clamping parts, and the pair of second clamping parts are used to clamp the end of the isolation membrane.
  • a pair of second clamping parts are used to clamp the end of the isolation membrane, which can reliably fix the end of the isolation membrane, and the pulling member can reliably pull out the piercing section of the isolation membrane to a preset length.
  • the traction member is a movable pulley.
  • the traction member is set as a movable pulley, and the abutment angle of the traction member relative to the surface of the isolation membrane can be automatically adjusted by rotating around its axis during the movement of the traction member pushing the isolation membrane, so as to avoid scratching the isolation membrane.
  • the winding device further includes: a fixed pulley, disposed between the winding component and the traction member, and used to guide the movement of the isolation film.
  • the belt running direction of the part between the pulley and the end of the isolation film is not only conducive to the calculation of the length of the passing section, but also can improve the working reliability of the winding device.
  • Some embodiments of the present application also propose a winding method for winding and forming an electrode assembly, the winding method comprising:
  • the part of the isolation film passing out of the winding part is the threading section
  • the winding part starts winding to form the electrode assembly.
  • the passing-out section of the separator whose length is a preset value can also be rolled into the winding part, so that the passing-out section of the separator and the newly entering winding part
  • the separator is stacked so that the separator between the negative electrode sheet and the positive electrode sheet of the inner ring has a multi-layer separator.
  • the preset value is greater than the circumference of the winding component.
  • the preset value of the piercing section is greater than the circumference of the winding part, and a multi-layer separator can be arranged at least between the first bending zone of the innermost circle of the positive pole piece and the negative pole piece inside it , so as to prevent lithium crystallization from piercing the separator when lithium crystallization occurs inside the first bending zone of the innermost ring of the positive pole piece, and can significantly improve the safety performance of the electrode assembly.
  • FIG. 1 shows is the structural representation of the winding equipment of some embodiments of the present application
  • Figure 2 shows a cross-sectional view of an electrode assembly wound and formed by a winding device according to some embodiments of the present application
  • Fig. 3 shows a schematic diagram of a state in which a traction member of a traction mechanism in a winding device in some embodiments of the present application is in a first position
  • Fig. 4 is a schematic diagram showing a state in which a traction member of a traction mechanism in a winding device in some embodiments of the present application is in a second position;
  • Fig. 5 is a schematic diagram showing a state in which the winding part is wound to drive the traction member to move to the first position in the winding device of some embodiments of the present application;
  • Fig. 6 is a schematic diagram showing the state of releasing the separator after the traction member of the traction mechanism in the winding device returns to the first position in some embodiments of the present application;
  • FIG. 7 shows a schematic structural view of another traction member of the traction mechanism in the winding device of some embodiments of the present application.
  • FIG. 8 shows is that the winding equipment among Fig. 3 is further provided with the structure diagram of fixed pulley (drive member is not shown);
  • Fig. 9 shows a schematic view of the structure of the winding device in Fig. 7 further provided with fixed pulleys
  • FIG. 10 shows is the process flow chart of the winding method of some embodiments of the present application.
  • Figure 11 shows a schematic view of the winding process of the winding device in Figure 3;
  • Figure 12 shows a schematic view of the winding process of the winding device in Figure 7;
  • Marking instructions 100-winding equipment; 110-winding parts; 111-winding needle; 112-gap; 1121-first end; 1122-second end; 115-pull-out side; 120-traction mechanism; 121-tractor; 1211-first clamping part; 122-driver; 130-fixer; 131-second clamping part; 140-fixed pulley; Component; 210-negative pole piece; 220-positive pole piece; 230-isolation film; 231-piercing section; 2311-initial end; 232-end; - Bending zone.
  • connection should be understood in a broad sense unless otherwise clearly specified and limited, for example, it can be a fixed connection or a Detachable connection, or integral connection; can be directly connected, can also be indirectly connected through an intermediary, and can be internal communication of two components.
  • connection can be a fixed connection or a Detachable connection, or integral connection; can be directly connected, can also be indirectly connected through an intermediary, and can be internal communication of two components.
  • “Plurality” in this application refers to two or more (including two).
  • the electrode assembly mentioned in the embodiments of the present application is an important part of a battery cell in a lithium-ion battery.
  • the electrode assembly is formed by laminating and winding the positive electrode piece, the negative electrode piece and the separator, and the separator is arranged between the positive electrode piece and the negative electrode piece to insulate and isolate the positive electrode piece and the negative electrode piece.
  • a battery cell works primarily by moving metal ions between the positive and negative pole pieces.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer.
  • the positive electrode active material layer is coated on the surface of the positive electrode current collector.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer.
  • the negative electrode active material layer is coated on the surface of the negative electrode current collector. surface.
  • the inventors have found through research that in the winding process of most electrode assemblies, a pair of winding needles of the winding part are usually used to clamp the separator and wind several turns, and then the negative pole piece and the positive pole piece are wound in sequence. If the end of the isolation film can be passed out of the winding part to form a passing section, by winding the exiting section around the winding part, it can be realized that when the winding part rotates one turn, the material from the incoming side of the isolation film When the new separator is pulled in, it is also rolled into the threading section, so that the industrial production of the above-mentioned electrode assembly can be realized without adding a feeding mechanism for the new separator, which reduces the improvement range and improvement of the existing winding equipment. cost.
  • a traction mechanism is further provided on the pull-out side of the winding part.
  • FIG. 1 shows a schematic structural view of a winding device according to some embodiments of the present application
  • FIG. 2 shows a cross-sectional view of an electrode assembly wound and formed by the winding device according to some embodiments of the present application.
  • FIG. 1 and 2 some embodiments of the present application propose a winding device 100 for winding and forming an electrode assembly 200.
  • the winding device 100 includes a winding part 110 and four feeding mechanisms (in the figure not shown).
  • the applicable battery cells for the electrode assembly 200 described in the embodiments of this application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries. Examples are not limited to this. However, for brevity of description, the following embodiments all take the winding process of an electrode assembly in a lithium-ion battery as an example for illustration.
  • the electrode assembly 200 includes a negative pole piece 210 , a positive pole piece 220 , a first separator 233 and a second separator 234 stacked and wound, and the first separator 233 and the second separator 234 is rolled in prior to the negative pole piece 210 and the positive pole piece 220 .
  • the second isolation film 234 is located inside the first isolation film 233 (that is, one side near the winding axis). side).
  • the negative pole piece 210 enters between the first separator 233 and the second separator 234 after the first separator 233 and the second separator 234 are wound at least one turn, so as to be rolled into the wound part 110; the positive pole piece 220 is The negative pole piece 210 is wound one turn and enters the side of the second separator 234 away from the negative pole piece 210 to be rolled into the winding part 110 .
  • one circle in this application refers to starting from a certain point of the electrode assembly 200, and going one circle along the winding direction to another point, and the connection line between the other point and the starting point is along the direction of the electrode assembly. radial extension.
  • the half circle in the present application refers to half of one circle, and those skilled in the art should understand the meaning of other circle numbers, and no further details are given here.
  • the winding part 110 is used for winding and forming the electrode assembly 200, and four feeding mechanisms (not shown in the figure) are arranged on the incoming side 114 of the winding part 110, and the four feeding mechanisms are respectively used
  • the negative electrode tab 210 , the positive electrode tab 220 , the first separator 233 and the second separator 234 are provided to the wound member 110 .
  • the winding part 110 includes a pair of winding needles 111, each winding needle 111 is in the shape of a semi-cylindrical or semi-elliptical cylinder, and the pair of rolling needles 111 are combined to form a cylindrical or elliptical cylindrical outer peripheral surface.
  • the winding part 110 and the pair of winding needles 111 rotate together to wind the negative pole piece 210 , the positive pole piece 220 , the first separator 233 and the second separator 234 on the outer peripheral surface of the winding part 110 .
  • the first isolation film 233 and the second isolation film 234 are collectively referred to as the isolation film 230 .
  • the separator 230 passes through the gap 112 , and a pair of isolation film clamping parts 113 are provided on one side of the pair of rolling pins 111 forming the gap 112 .
  • the separator 230 is jointly clamped by a pair of isolation clamping parts, and the winding part 110 starts to wind the electrode assembly 200 again.
  • the rotation direction of the winding member 110 is the first direction P.
  • some embodiments of the present application propose a winding device 100 for winding and forming an electrode assembly 200.
  • the winding device 100 includes a winding component 110 and a pulling mechanism 120.
  • the pulling mechanism 120 is configured to After the isolation film 230 passes through the winding component 110 , the exiting section 231 of the isolation film 230 is pulled, so that the length of the exiting section 231 reaches a preset value.
  • the winding component 110 is configured to start winding after the length of the piercing section 231 reaches a preset value, so as to shape the electrode assembly 200 .
  • One end of the gap 112 corresponding to the incoming material side 114 of the winding part 110 is the first end 1121, and the other end is the second end 1122.
  • the isolation film 230 enters the gap 112 from the first end 1121, and passes through the gap 112 from the second end 1122. . It can be understood that, during the rotation of the winding component 110 , the orientations of the first end 1121 and the second end 1122 of the gap 112 are also constantly changing. As shown in FIG.
  • the gap 112 is linear, and the first end 1121 and the second end 1122 are located on opposite sides of the winding part 110 in the radial direction; in other embodiments , the gap 112 may also be in the shape of a broken line, and the first end 1121 and the second end 1122 form an angle of 90°, 150°, etc. around the circumference of the winding component 110 .
  • the exiting section 231 of the isolation film 230 refers to the part of the isolation film 230 passing out of the winding part 110 , that is, the part between the end 232 of the isolation film 230 and the second end 1122 of the gap 112 .
  • the position where the second end 1122 of the gap 112 of the isolation film 230 passes through is the starting end 2311 of the exiting section 231
  • the end 232 of the isolation film 230 is the tail end of the exiting section 231 .
  • the traction mechanism 120 can pull the isolation film 230 to move by acting on the tail end of the exit section 231 (ie, the end 232 of the isolation film 230 ), or by acting on the middle part of the exit section 231 (that is, the starting point of the exit section 231 ). part between the starting end 2311 and the tail end) to pull the isolation film 230 to move.
  • the pulling mechanism 120 can automatically pull the passing section 231 to move, or can pull the passing section 231 to move manually.
  • the winding part 110 also includes a pull-out side 115 corresponding to the incoming material side 114, and the traction mechanism 120 is arranged on the pull-out side 115 of the winding part 110, and is used to pull and move from the passing section 231 of the separator 230 to move the separator 230 is pulled from second end 1122 of gap 112 . As shown in FIG.
  • the incoming material side 114 and the pulling-out side 115 of the winding component 110 can be respectively located on opposite sides in the radial direction, so as to rationally arrange the incoming material mechanism and the pulling mechanism 120 ; in other embodiments, the material-incoming side 114 and the pulling-out side 115 of the winding component 110 may also be arranged at a certain angle around the circumference of the winding component 110 .
  • the winding device 100 of the embodiment of the present application includes a traction mechanism 120, and the traction mechanism 120 can pull the penetration section 231 of the isolation film 230 to move, so that the length of the penetration section 231 reaches a preset value, and the penetration section 231 of the isolation film 230
  • the winding part 110 is also rolled in, and the separator 230 of the separator 230 and the separator 230 newly entering the winding part 110 are stacked so that the separator 230 between the negative pole piece 210 and the positive pole piece 220 of the inner ring is stacked.
  • the electrode assembly 200 wound and formed by using the winding device 100 has high safety performance, and the winding device 100 can realize the industrial production of the electrode assembly 200 and improve the manufacturing efficiency of the electrode assembly 200 .
  • FIG. 3 shows is the state diagram of a kind of traction member of the traction mechanism in the winding equipment of some embodiments of the present application is in the first position;
  • Fig. 4 shows the traction in the winding equipment of some embodiments of the present application A schematic diagram of the state of a traction member of the mechanism in the second position.
  • the traction mechanism 120 includes a traction member 121 and a driving member 122, and the driving member 122 is used to drive the traction member 121 to move between the first position and the second position.
  • the pulling member 121 is configured to pull the passing section 231 during the process of moving from the first position to the second position.
  • the moving path of the traction member 121 between the first position and the second position may be a straight line or a curve; as shown in FIG. 4 , in some embodiments of the present application, the traction member 121 moves along the second A sub-direction Q1 moves from the first position to the second position, and the moving path of the pulling member 121 is a straight line.
  • the pulling member 121 can act on the passage section 231 of the isolation membrane 230 by clamping, or can act on the passage section 231 of the isolation membrane 230 by vacuum adsorption, or push the middle part of the isolation membrane 230 to pull the isolation membrane The piercing section 231 of 230 is pulled out.
  • the first position is the position where the pulling member 121 starts to act on the passing section 231 of the isolation membrane 230
  • the second position is that the pulling member 121 pulls the passing section 231 of the separating membrane 230 to move so that the length of the passing section 231 is a preset value position
  • the traction member 121 moves from the first position to the second position
  • the isolation film 230 is pulled out from the second end 1122 of the gap 112, so that the length of the piercing section 231 becomes longer until the piercing section 231 The length reaches the preset value.
  • the first position corresponds to the position of the second end 1122 of the gap 112 before the winding part 110 starts winding, so that the pulling member 121 acts on the isolation film 230 at the first position.
  • the second position may be located on one side of the first position in the horizontal direction, may be located below the first position in the direction of gravity G, or may be located on one side of the first position in other directions.
  • the traction member 121 is installed on the execution end of the driving member 122, and the driving member 122 drives the traction member 121 to move between the first position and the second position.
  • the driving member 122 can be a common linear drive mechanism such as a linear cylinder or an electric push rod; 122 may also be a rotary drive mechanism such as a powered turntable to drive the traction member 121 to move around the drive member 122 in the circumferential direction.
  • the traction mechanism 120 may further include a guide rail assembly, the traction member 121 is slidably mounted on the guide rail assembly, and the guide rail assembly guides the traction member 121 to move between the first position and the second position.
  • the pulling member 121 pulls the passing section 231 of the isolation film 230 during the process of moving from the first position to the second position, so that the automatic drawing of the separating film 230 can be realized. Section 231 to bring it to the preset value.
  • Fig. 5 is a schematic view showing a state in which the winding component is wound to drive the traction member to move to the first position in the winding device of some embodiments of the present application.
  • the traction member 121 is configured to return to the first position from the second position after the winding member 110 starts winding, and in the process of returning to the first position Tension is provided to the isolation membrane 230 .
  • the path of the traction member 121 moving from the first position to the second position and the path of moving from the second position to the first position may be the same or different.
  • the traction member 121 returns from the second position to the first position along the original path of moving from the first position to the second position, that is, along the second sub-direction Q2 of the second direction from the first position to the first position. The second position moves to the first position.
  • the winding part 110 rotates around the first direction P, and the passing-out section 231 is wound around the winding part 110, and the length of the passing-out section 231 is Shorten until it is completely rolled into the winding part 110.
  • the traction member 121 moves from the second position to the first position along the second sub-direction Q2 of the second direction, the traction member 121 continues to act on the part of the passing section 231 that is not involved in the winding component 110, so as to The portion of the threading-out section 231 that is not drawn into the winding member 110 is tensioned.
  • the traction member 121 provides the tension force to the isolation membrane 230 .
  • the tension force may be provided by the driving member 122 itself, or other elastic members may be provided to provide the tension force.
  • the linear cylinder can be set to an unloading state, and damping can be formed by the air pressure inside the linear cylinder;
  • the traction mechanism 120 can also include a spring, one end of which is fixedly arranged, and another One end abuts against the traction member 121 , and the other end of the spring exerts a force toward the second position on the traction member 121 during the process of the traction member 121 moving from the second position to the first position.
  • the traction member 121 tensions the isolation film 230 during the process of returning from the second position to the first position, so that the exiting section 231 of the isolation film 230 is tightly wound on the roll.
  • the component 110 can be wound without wrinkling, which improves the winding quality of the separator 230 and makes the electrode assembly 200 have better safety performance.
  • Fig. 6 is a schematic diagram showing a state of releasing the separation film after the traction member of the traction mechanism in the winding device returns to the first position in some embodiments of the present application.
  • the traction member 121 is configured to return from the second position to the first position after the winding member 110 starts winding, and when returning to the first position, isolate the The membrane 230 is released.
  • the traction member 121 When the traction member 121 returns to the first position, the traction member 121 releases the isolation film 230 to allow the winding component 110 to continue to be wound into the remaining part of the exit section 231 .
  • the first position may be located below the gravity direction G of the winding component 110 , or may be located at other positions of the winding component 110 , such as obliquely below or on one side in the horizontal direction.
  • the isolation film 230 is released, and the winding member 110 continues to wind so as to wrap the remaining part of the exiting section 231 of the isolation film 230 into the winding member 110 , to shape the electrode assembly 200 .
  • the traction member 121 when the traction member 121 is in the first position, along the gravity direction G, the traction member 121 is located below the winding component 110 .
  • the traction member 121 When the traction member 121 is in the first position, the traction member 121 may be located directly below the winding component 110 along the gravity direction G, or may be located obliquely below the winding component 110 along the gravity direction G.
  • the traction member 121 when the traction member 121 is in the first position, it is located below the winding member 110. After the traction member 121 returns to the first position and releases the isolation membrane 230, the remaining part of the exiting section 231 of the isolation membrane 230 moves along the The gravitational direction G naturally droops, and the remaining part of the exit section 231 of the separator 230 enters the winding part 110 smoothly without wrinkles, which improves the winding quality of the separator 230 and makes the electrode assembly 200 have better safety performance.
  • the moving direction of the traction member 121 intersects the direction G of gravity.
  • the traction member 121 During the movement of the traction member 121 between the first position and the second position, its moving path may be a plurality of directions intersecting with the direction G of gravity.
  • the second direction is the horizontal direction, and the traction member 121 moves along the horizontal direction
  • the moving direction of the tractor 121 and the direction of the tractor 121 in the first position relative to the winding component 110 are arranged perpendicular to each other, so as to minimize the space occupied by the tractor 121 in the direction of gravity G during the movement.
  • the moving direction of the pulling member 121 and the direction of the pulling member 121 at the first position relative to the winding component 110 can also be flexibly set.
  • the traction member 121 moves along the direction intersecting with the direction of gravity G, so that the path that the traction member 121 moves between the first position and the second position intersects with the direction of gravity G, thereby reducing the time required for the traction member 121 to move.
  • the space occupied in the direction of gravity G and can have a longer travel range.
  • the pulling member 121 includes a pair of first clamping portions 1211 for clamping the end portion 232 of the isolation membrane 230 .
  • the pair of first clamping parts 1211 clamp the isolation film 230 from both sides in the thickness direction of the isolation film 230 , and the pair of first clamping parts 1211 can be a pair of pneumatic fingers or electric fingers.
  • a pair of first clamping parts 1211 pull out the passing section 231 from the gap 112 of the winding part 110 by clamping the end 232 of the isolation film 230, and the moving stroke of the pair of first clamping parts 1211 is equal to the passing section 231 is based on the pull-out length of the first position.
  • a pair of clamping parts are used to clamp the end portion 232 of the isolation film 230, and the passing-through section 231 of the isolation film 230 can be reliably pulled to move, thereby reliably pulling out the passing-out section 231 of the isolation film 230 to the predetermined position.
  • Fig. 7 shows a schematic structural view of another traction member in the traction mechanism of the winding device according to some embodiments of the present application.
  • the winding device 100 further includes a fixing member 130 for fixing the end 232 of the separator 230 , and the fixing member 130 is configured to return to the first Release the end 232 of the isolation film 230 when in position; wherein, the traction member 121 is configured to push the part of the isolation film 230 between the fixing member 130 and the winding member 110 .
  • the fixing part 130 may be disposed below the winding part 110 along the gravity direction G; the fixing part 130 may also be disposed in other orientations of the winding part 110 .
  • the fixing member 130 can fix the end 232 of the isolation membrane 230 by clamping, and the fixing member 130 can also fix the end 232 of the isolation membrane 230 by adsorption.
  • the traction member 121 can be a strip-shaped push rod extending along the width direction of the isolation membrane 230, and acts on the isolation membrane 230 through the outer peripheral surface of the push rod; the traction member 121 can also rotate around its own axis along the width direction of the isolation membrane 230 rollers or pulleys etc.
  • the traction member 121 is arranged between the fixing member 130 and the winding part 110, and is used to push the middle part of the exit section 231 of the isolation film 230 (that is, from the exit section 231 and the second end 1122 of the gap 112 to the separation film 230). the portion between the ends 232).
  • the traction member 121 can be directly arranged at the midpoint between the winding part 110 and the fixing part 130, and the distance from the action point of the isolation film 230 to the winding part 110 and the fixing part 130 during the process of pushing the isolation film 230 is the same, And the length of the passing section 231 is greater than the moving stroke of the traction member 121; preferably, when the fixing member 130 and the winding part 110 are arranged in close proximity, the length of the passing section 231 is about twice the moving stroke of the pulling member 121, which can The moving stroke of the traction member 121 is obviously shortened, and the required space is reduced.
  • the pulling member 121 may also be located at other positions between the winding component 110 and the fixing member 130 , for example, at a third position between the winding component 110 and the fixing member 130 .
  • the traction member 121 is arranged at the midpoint position between the middle part and the fixing part 130, and the distance from the action point of the isolation film 230 to the middle part and the fixing part 130 is the same in the process of pushing the isolation film 230, and the passage section 231 The length from the middle part to the tail end is greater than the moving stroke of the traction member 121 .
  • the fixing part 130 fixes the end 232 of the isolation film 230, and the pulling part 121 pushes the part of the isolation film 230 between the fixing part 130 and the winding part 110 to pull the passing section 231 of the isolation film 230.
  • the stroke length of the traction member 121 when moving between the first position and the second position can be shortened, and the space occupied by the traction member 121 during the movement can be reduced.
  • the fixing member 130 releases the end portion 232 of the isolation film 230 when the pulling member 121 returns to the first position, and the winding part 110 continues to wind to wrap the remaining part of the passing section 231 of the isolation film 230 into the winding part 110, so as to The electrode assembly 200 is formed.
  • the fixing member 130 includes a pair of second clamping portions 131 for clamping the end portion 232 of the isolation membrane 230 .
  • a pair of second clamping parts 131 clamp the isolation film 230 from both sides in the thickness direction of the isolation film 230 , and the pair of second clamping parts 131 can be a pair of pneumatic fingers or electric fingers.
  • a pair of second clamping parts 131 are used to clamp the end 232 of the isolation membrane 230, so that the end 232 of the isolation membrane 230 can be reliably fixed, and the pulling member 121 can reliably pull out the passage of the isolation membrane 230.
  • Segment 231 to a preset length.
  • the traction member 121 is a movable pulley.
  • the central axis of the traction member 121 extends along the width direction of the isolation film 230, and the two ends of the axial direction of the traction member 121 exceed the two ends of the width direction of the isolation film 230, so as to act uniformly along the width of the isolation film 230. Isolation film 230 .
  • the traction member 121 is set as a movable pulley, and the traction member 121 can automatically adjust the abutment angle of the traction member 121 relative to the surface of the isolation membrane 230 by rotating around its axis during the movement of the traction member 121 to push the isolation membrane 230 to avoid Scratch the isolation film 230 .
  • Fig. 8 shows a schematic view of the structure of the winding device in Fig. 3 further provided with a fixed pulley (the driving member is not shown);
  • Fig. 9 shows a schematic view of the structure of the winding device in Fig. 7 further provided with a fixed pulley.
  • the winding device 100 further includes a fixed pulley 140 disposed between the winding component 110 and the traction member 121 for guiding the movement of the isolation film 230 .
  • the axial direction of the fixed pulley 140 extends along the width direction of the isolation membrane 230 , and both ends of the fixed pulley 140 in the axial direction exceed the isolation membrane 230 to act on the isolation membrane 230 uniformly along the width direction of the isolation membrane 230 .
  • the passing section 231 of the isolation film 230 changes its direction of travel after bypassing the fixed pulley 140 .
  • the traveling direction of the part of the isolation film 230 from the fixed pulley 140 to the traction member 121 is constant.
  • the isolation membrane 230 based on the above-mentioned implementation in which the fixing member 130 fixes the end 232 of the isolation membrane 230 and the pulling member 121 pushes the part between the winding part 110 and the fixing member 130 of the isolation membrane 230, the isolation membrane 230 The passing section 231 changes the traveling direction after bypassing the fixed pulley 140.
  • the traction member 121 pushes the isolation film 230 to pull out the passing section 231 of the isolation film 230, and the isolation film 230 passes through the fixed pulley.
  • the position of the part 140 and the part fixed on the fixing part 130 is fixed.
  • FIG. 10 shows a process flow chart of the winding method of some embodiments of the present application.
  • some embodiments of the present application also propose a winding method for winding and forming an electrode assembly 200.
  • the winding method includes:
  • the embodiment of the present application describes the winding method of the embodiment of the present application in combination with the method of using the winding device 100 . It can be understood that, the winding method in the embodiment of the present application includes but is not limited to implementing by using the winding device 100 in the embodiment of the present application.
  • the isolation film 230 enters the gap 112 from the first end 1121 of the gap 112 between a pair of rolling pins 111, passes through the gap 112 from the second end 1122, and the part of the isolation film 230 from the second end 1122 to the end 232 To pass through section 231.
  • S200 pulling the exiting section 231 of the isolation film 230 so that the length of the exiting section 231 reaches a preset value, including:
  • S210 the pulling member 121 moves from the first position to the second position to pull the piercing section 231, so that the length of the piercing section 231 reaches a preset value, including:
  • the traction member 121 includes a pair of first clamping portions 1211, and the end portion 232 of the isolation membrane 230 is clamped by the pair of first clamping portions 1211, and the traction member 121 moves from the first position to the second position, so that the wearer The length of the outgoing segment 231 reaches a preset value.
  • S210 the pulling member 121 moves from the first position to the second position to pull the passing section 231, so that the length of the passing section 231 reaches a preset value, including:
  • the traction member 121 is a movable pulley, and the fixing member 130 is used to fix the end 232 of the isolation film 230.
  • the traction member 121 pushes the part between the winding part 110 and the fixing member 130 of the isolation film 230 and moves from the first position to the second position. Two positions, so that the length of the piercing section 231 reaches a preset value.
  • S200 pulling the exiting section 231 of the isolation film 230 so that the length of the exiting section 231 reaches a preset value, including:
  • a fixed pulley 140 is set between the winding part 110 and the traction member 121, and after the isolation film 230 passes through the second end 1122 of the gap 112 of the winding part 110, it first bypasses the fixed pulley 140, and then is pulled by the traction member 121 .
  • S300 the winding part 110 starts winding to form the electrode assembly 200, including:
  • the traction member 121 is a movable pulley, and the fixing member 130 is used to fix the end 232 of the isolation film 230, and the traction member 121 pushes the part between the winding part 110 and the fixation member 130 of the isolation film 230 and moves from the first position to The second position is an embodiment in which the length of the piercing section 231 reaches a preset value, S300: the winding part 110 starts winding to shape the electrode assembly 200, and further includes:
  • the exit section 231 of the separator 230 whose length is a preset value can also be rolled into the winding part 110, so that the exit section 231 of the separator 230 and
  • the separator 230 that newly enters the winding part 110 is stacked so that the separator 230 between the negative pole piece 210 and the positive pole piece 220 of the inner ring has a multilayer separator, and lithium dendrites are not easy to puncture when the lithium precipitation phenomenon occurs.
  • the separator the negative pole piece 210 and the positive pole piece 220 are in contact, thereby causing an internal short circuit of the electrode assembly 200.
  • the electrode assembly 200 wound and formed by this winding method has higher safety performance.
  • the preset length of the piercing section 231 is greater than the circumference of the winding component 110 .
  • FIG. 1 based on the implementation form in which the first end 1121 and the second end 1122 of the aforementioned gap 112 are located on opposite radial sides of the winding component 110, when the length of the passing section 231 reaches a preset value
  • the rear winding part 110 starts to rotate. From the starting end 2311 , the piercing section 231 is in direct contact with the winding component for half the circumference, until it is stacked with the first isolation film 233 in the isolation film 230 .
  • the outer side of the negative electrode sheet 210 increases the penetration of the stacked arrangement on the basis of the original first separator 233.
  • the output section 231, that is, the number of separator layers of the negative electrode sheet 210 is three.
  • the positive pole piece 220 After the positive pole piece 220 enters the winding member 110 from the inner side of the second separator 234, the positive pole piece 220 is arranged opposite to the outer side of the previously rolled-in negative pole piece 210, that is, the innermost circle of the positive pole piece 220 and the innermost negative electrode
  • the number of isolation film layers between the pole pieces 210 is three.
  • the piercing section 231 continues to stack half of the circumference of the winding part 110, and can cover the first bending area 235 of the innermost circle of the positive pole piece 220, thereby protecting the first bending zone 235 of the innermost circle of the positive pole piece 220.
  • the folding area 235 will not cause short circuit of the electrode assembly 200 when lithium is deposited.
  • the preset value of the piercing section 231 is greater than the circumference of the winding part 110, and can be at least between the first bending zone 235 (please refer to FIG.
  • a multi-layer separator film is arranged between the negative pole pieces 210, so as to prevent the lithium crystallization from piercing the separator film when lithium precipitation occurs on the inner side of the first bending region 235 (please refer to FIG. 2 ) of the innermost circle of the positive pole piece 220,
  • the safety performance of the electrode assembly 200 can be significantly improved.
  • the preset value when it is necessary to protect the first and second bending regions 235 of the innermost ring of the positive pole piece 220 from being affected by lithium precipitation, the preset value may be greater than 1.5 of the circumference of the winding component 110 times; and so on, along the direction in which the positive pole piece 220 is wound outward from the innermost circle, for each additional protection of a bending zone 235, the length of the preset value increases the length of a circumference of the winding part, which is not described in this paper. Another example.
  • FIG. 11 shows a schematic view of the winding process of the winding device in FIG. 3
  • FIG. 12 shows a schematic view of the winding process of the winding device in FIG. 7 .
  • some embodiments of the present application provide a winding device 100 for winding and forming an electrode assembly 200.
  • the winding device 100 includes a winding part 110, a pulling mechanism 120 and a fixed Pulley 140.
  • the traction mechanism 120 includes a traction member 121, the fixed pulley 140 is fixedly disposed under the winding component 110, and the traction member 121 can move between a first position and a second position.
  • the traction member 121 includes a pair of first clamping portions 1211 .
  • the winding method of this winding device 100 is as follows:
  • the isolation film 230 passes through the winding part 110, and the end part 232 exposes the winding part 110;
  • a pair of first clamping parts 1211 of the traction member 121 clamp the end part 232 of the isolation film 230;
  • the traction member 121 drives the end 232 of the isolation film 230 to move from the first position to the second position along the first sub-direction Q1, and pulls the isolation film 230 out until the length of the passing section 231 reaches a preset value, wherein the preset The set value is L1+L2, and the length of the preset value is greater than the circumference of the winding part 110;
  • the winding part 110 starts winding along the first direction P, and at the same time, the traction member 121 clamps the end 232 of the isolation film 230 and retreats along the second sub-direction Q2, so as to tension the exiting section 231 of the isolation film;
  • the traction member 121 After the traction member 121 returns to the first position, the traction member 121 releases the end 232 of the separator 230, and the winding part 110 continues to be wound, so as to completely roll the piercing section 231 into the winding part 110, thereby obtaining an electrode with a special structure Component 200.
  • the winding device 100 includes a winding part 110, a pulling mechanism 120, a fixing Part 130 and fixed pulley 140.
  • the traction mechanism 120 includes a traction member 121, the fixed pulley 140 is fixedly disposed under the winding component 110, and the traction member 121 can move between a first position and a second position. Wherein, the traction member 121 is a movable pulley.
  • the isolation film 230 passes through the winding part 110 and then bypasses the fixed pulley 140.
  • the fixing member 130 is fixedly arranged under the fixed pulley 140.
  • the fixing member 130 includes a pair of second clamping parts 131, and a pair of second clamping parts 131 Used to hold the end 232 of the isolation membrane 230 .
  • the traction member 121 is disposed between the fixing member 130 and the fixed pulley 140 , and the traction member 121 can push the isolation film 230 to pull out the passing section 231 of the isolation film 230 .
  • the use method of this winding device 100 is as follows:
  • the isolation film 230 passes through the winding part 110, and the end part 232 exposes the winding part 110;
  • the fixing part 130 fixes and clamps the end 232 of the separator 230;
  • the traction member 121 pushes the part of the isolation film 230 between the fixed pulley 140 and the fixed member 130, and moves from the first position to the second position along the first sub-direction Q1, so as to pull the isolation film 230 out of the winding part 110. Pull out until the length of the piercing section 231 is a preset value, wherein the preset value is L1+L3+L4, and the length of the preset value is greater than the circumference of the winding part 110;
  • the winding part 110 starts winding along the first direction P, and at the same time, the traction member 121 pushes against the isolation film 230 and retreats along the second sub-direction Q2, so as to tension the exit section 231 of the isolation film 230;
  • the traction member 121 After the traction member 121 returns to the first position, the traction member 121 releases the isolation film 230, the fixing member 130 releases the end 232 of the isolation film 230, and the winding part 110 continues to be wound, so that the passing section 231 is completely rolled into the winding part 110, thereby obtaining an electrode assembly 200 with a special structure.
  • the winding device 100 of the embodiment of the present application includes a winding component 110 and a traction mechanism 120, which can stretch the length of the exit section 231 of the isolation film 230 to a preset value, and the winding component 110 can be rolled in and out during winding.
  • Section 231 forms a special structure of the electrode assembly 200 .
  • the direct connection causes a short circuit inside the electrode assembly 200, which has high safety performance. Using the winding device 100 and the winding method to wind and form the electrode assembly 200 can not only realize the industrial production of the electrode assembly 200 but also improve the manufacturing efficiency of the electrode assembly 200 .

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Abstract

本申请涉及一种卷绕设备以及卷绕方法，属于电池制造技术领域。本申请提出一种卷绕设备，包括：卷绕部件；牵引机构，牵引机构被配置为在隔离膜穿出卷绕部件之后牵引隔离膜的穿出段，以使穿出段的长度达到预设值；其中，卷绕部件被配置为在穿出段的长度达到预设值后开始卷绕，以成型电极组件。本申请还提出一种卷绕方法，用于卷绕成型电极组件。该卷绕设备以及卷绕方法用于卷绕成型一种安全性能较高的电极组件，能够实现该电极组件的工业化生产，提高该电极组件的制造效率。

Description

卷绕设备以及卷绕方法
相关申请的交叉引用
本申请要求享有2022年01月28日提交的名称为“卷绕设备以及卷绕方法”的中国专利申请(202210109403.4)的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请设计电池制造技术领域，具体而言，涉及一种卷绕设备以及卷绕方法。
背景技术
随着新能源汽车行业的快速发展，动力电池的技术水平也越来越成熟，动力电池的安全性能也成为衡量其性能优劣的重要指标之一。卷绕成型的电极组件是电池单体内部的重要部件，电极组件的安全性能对电池单体的安全性能起到决定性的作用。然而，即使对电极组件的构造作出改进以提高电池单体的安全性能，目前却不存在对应的卷绕设备，导致即使电极组件的结构作出改进后也无法实现工业化生产。
发明内容
为此，本申请提出一种卷绕设备以及卷绕方法，用于卷绕成型一种安全性能较高的电极组件，能够实现该电极组件的工业化生产，提高该电极组件的制造效率。
本申请的一些实施例提出一种卷绕设备，用于卷绕成型电极组件，所述卷绕设备包括：卷绕部件；牵引机构，所述牵引机构被配置为在隔离膜穿出所述卷绕部件之后牵引所述隔离膜的穿出段，以使所述穿出段的长度达到预设值；其中，所述卷绕部件被配置为在所述穿出段的长度达到所述预设值后开始卷绕，以成型所述电极组件。
本申请实施例的卷绕设备包括牵引机构，牵引机构能够牵引隔离膜的穿出段移动，以使所述穿出段的长度达到预设值，隔离膜的穿出段也卷入卷绕部件，使隔离膜的穿出段与新进入卷绕部件的隔离膜层叠设置以使内圈的负极极片和正极极片之间的隔离膜具有多层隔离膜，在析锂现象发生时锂枝晶不容易刺穿隔离膜而导致负极极片和正极极片相接触进而引发电极组件内部短路。使用该卷绕设备卷绕成型的电极组件具有较高的安全性能，且该卷绕设备能够实现该种电极组件的工业化生产，提高该种电极组件的制造效率。
根据本申请的一些实施例，所述牵引机构包括牵引件和驱动件，所述驱动件用于驱动所述牵引件在第一位置和第二位置之间移动，所述牵引件被配置为在由所述第一位置向所述第二位置移动的过程中牵引所述穿出段。
在上述方案中，在驱动件的驱动下，牵引件在由第一位置向第二位置移动的过程中牵引隔离膜的穿出段，从而能够实现自动化牵引隔离膜的穿出段以使其达到预设值。
根据本申请的一些实施例，所述牵引件被配置为在所述卷绕部件开始卷绕后从所述第二位置回到所述第一位置，且在回到所述第一位置的过程中向所述隔离膜提供张紧力。
在上述方案中，在卷绕部件开始卷绕后，牵引件在由第二位置回到第一位置的过程中张紧隔离膜，使隔离膜的穿出段紧绕于卷绕部件，且不会发生褶皱，提高了隔离膜的卷绕质量，使电极组件具有较好的安全性能。
根据本申请的一些实施例，所述牵引件被配置为在所述卷绕部件开始卷绕后从所述第二位置回到所述第一位置，且在回到所述第一位置时将所述隔离膜释放。
在上述方案中，牵引件在由第二位置回到第一位置时释放隔离膜，卷绕部件继续卷绕以将隔离膜的穿出段的剩余部分卷入卷绕部件，以成型电极组件。
根据本申请的一些实施例，在所述牵引件处于所述第一位置时，沿重力方向，所述牵引件位于所述卷绕部件的下方。
在上述方案中，牵引件处于第一位置时位于卷绕部件的下方，在牵引件回到第一位置且释放隔离膜后，隔离膜的穿出段的剩余部分沿着重力方向自然下垂，隔离膜的穿出段的剩余部分进入卷绕部件的过程中平整无褶皱，提高了隔离膜的卷绕质量，使电极组件具有较好的安全性能。
根据本申请的一些实施例，所述牵引件的移动方向与所述重力方向相交。
在上述方案中，牵引件沿着与重力方向相交的方向移动，能够使牵引件在第一位置和第二位置之间移动的路径与重力方向相交，减少牵引件移动过程中在重力方向上所占用的空间，且能够具有较长的行程范围。
根据本申请的一些实施例，所述牵引件包括一对第一夹持部，所述一对第一夹持部用于夹持所述隔离膜的端部。
在上述方案中，使用一对夹持部夹持隔离膜的端部，能够可靠地牵引隔离膜的穿出段移动，从而可靠地拉出隔离膜的穿出段至预设长度。
根据本申请的一些实施例，所述卷绕设备还包括：固定件，用于固定所述隔离膜的端部，所述固定件被配置为在所述牵引件回到所述第一位置时将所述隔离膜的端部释放；其中，所述牵引件被配置为顶推所述隔离膜的位于所述固定件和所述卷绕部件之间的部分。
在上述方案中，固定件固定隔离膜的端部，牵引件顶推隔离膜的位于固定件和卷绕部件之间的部分，将隔离膜的穿出段拉出至预设长度，能够缩短牵引件在第一位置和第二位置之间移动时的行程长度，减少牵引件移动过程中所占用的空间。固定件在牵引件回到第一位置时释放隔离膜的端部，卷绕部件继续卷绕以将隔离膜的穿出段的剩余部分卷入卷绕部件，以成型电极组件。
根据本申请的一些实施例，所述固定件包括一对第二夹持部，所述一对第二夹持部用于夹持所述隔离膜的端部。
在上述方案中，使用一对第二夹持部夹持隔离膜的端部，能够可靠地固定隔离膜的端部，牵引件能够可靠地拉出隔离膜的穿出段至预设长度。
根据本申请的一些实施例，所述牵引件为动滑轮。
在上述方案中，将牵引件设置为动滑轮，牵引件顶推隔离膜移动的过程中可以通过绕其轴线转动来自动调整牵引件相对于隔离膜的表面的抵接角度，避免划伤隔离膜。
根据本申请的一些实施例，所述卷绕设备还包括：定滑轮，设置于所述卷绕部件和所述牵引件之间，用于引导所述隔离膜移动。
在上述方案中，通过在卷绕部件和牵引件之间设置定滑轮，能够引导改变隔离膜的走带方向，降低卷绕部件转动过程对穿出段的影响，利于控制穿出段的从定滑轮处至隔离膜的端部之间的部分的走带方向，不仅利于穿出段的长度的计算，还能够提 高卷绕设备的工作可靠性。
本申请的一些实施例还提出一种卷绕方法，用于卷绕成型电极组件，所述卷绕方法包括：
将隔离膜穿过卷绕部件，所述隔离膜的穿出所述卷绕部件的部分为穿出段；
牵引所述隔离膜的所述穿出段，以使所述穿出段的长度达到预设值；
所述卷绕部件开始卷绕，以成型所述电极组件。
使用本申请实施例的卷绕方法卷绕成型电极组件，能够将长度为预设值的隔离膜的穿出段也卷入卷绕部件，使隔离膜的穿出段与新进入卷绕部件的隔离膜层叠设置以使内圈的负极极片和正极极片之间的隔离膜具有多层隔离膜，在析锂现象发生时锂枝晶不容易刺穿隔离膜而导致负极极片和正极极片相接触进而引发电极组件内部短路，使用该卷绕方法卷绕成型的电极组件具有较高的安全性能。
根据本申请的一些实施例，所述预设值大于所述卷绕部件的周长。
在上述方案中，穿出段的预设值大于卷绕部件的周长，能够至少在正极极片的最内圈的第一个弯折区与其内侧的负极极片之间设置多层隔离膜，从而避免正极极片的最内圈的第一个弯折区的内侧发生析锂时锂析晶刺穿隔离膜，能够明显改善电极组件的安全性能。
本申请的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本申请的实践了解到。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，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，还可以根据这些附图获得其他相关的附图。
图1示出的是本申请的一些实施例的卷绕设备的结构示意图；
图2示出的是本申请的一些实施例的卷绕设备所卷绕成型的电极组件的剖面图；
图3示出的是本申请的一些实施例的卷绕设备中牵引机构的一种牵引件处于第一位置的状态示意图；
图4示出的是本申请的一些实施例的卷绕设备中牵引机构的一种牵引件处于第二位置的状态示意图；
图5示出的是本申请的一些实施例的卷绕设备中卷绕部件卷绕以带动牵引件向第一位置移动的状态示意图；
图6示出的是本申请的一些实施例的卷绕设备中牵引机构的牵引件回到第一位置后释放隔离膜的状态示意图；
图7示出的是本申请的一些实施例的卷绕设备中牵引机构的另一种牵引件的结构示意图；
图8示出的是图3中的卷绕设备进一步设置定滑轮的结构示意图(没有示出驱动件)；
图9示出的是图7中的卷绕设备进一步设置定滑轮的结构示意图；
图10示出的是本申请的一些实施例的卷绕方法的工艺流程图；
图11示出的是图3中的卷绕设备的卷绕过程示意图；
图12示出的是图7中的卷绕设备的卷绕过程示意图；
在附图中，附图并未按照实际的比例绘制。
标记说明：100-卷绕设备；110-卷绕部件；111-卷针；112-间隙；1121-第一端；1122-第二端；113-隔离膜夹持部；114-来料侧；115-拉出侧；120-牵引机构；121-牵引件；1211-第一夹持部；122-驱动件；130-固定件；131-第二夹持部；140-定滑轮；200-电极组件；210-负极极片；220-正极极片；230-隔离膜；231-穿出段；2311-起始端；232-端部；233-第一隔离膜；234-第二隔离膜；235-弯折区。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例，都属于本申请保护的范围。
除非另有定义，本申请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；本申请中在申请的说明书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”以及他们的任何变形，意图在于覆盖不排他的包含。本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序或主次关系。
在本申请中提及“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，本申请所描述的实施例可以与其它实施例相结合。
在本申请的描述中需要说明的是除非另有明确的规定和限定术语“安装”、“相连”、“连接”、“附接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；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。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中的具体含义。
本申请中出现的“多个”指的是两个以上(包括两个)。
本申请的实施例所提到的电极组件，是锂离子电池中电池单体的重要部件。电极组件由正极极片、负极极片和隔离膜层叠卷绕形成，隔离膜设置于正极极片和负极极片之间，以绝缘隔离正极极片和负极极片。电池单体主要依靠金属离子在正极极片和负极极片之间移动来工作。正极极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面，负极极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面。
相关技术中，电极组件卷绕成型后，电极组件的最内几圈处的弯折区的正极极片和负极极片在同样的角度范围内存在面积差，容易产生析锂现象，锂析晶容易刺穿隔离膜导致正极极片和负极极片短接，导致电极组件内部发生短路。目前存在一种电极组件的改进思路，在电极组件的最内几圈的正极极片和负极极片之间多设置几层隔离膜，即使出现析锂现象，锂析晶也不容易刺穿隔离膜，从而克服上述缺陷，使电极 组件在最内几圈发生析锂现象时也具有较好的安全性能。但是，目前尚没有对应的卷绕设备以及卷绕方法可以实现该种电极组件的工业化生产。
发明人经过研究发现，大多数电极组件的卷绕过程中，通常是先使用卷绕部件的一对卷针夹持隔离膜并卷绕几圈，再依次卷入负极极片和正极极片。如果能够将隔离膜的端部穿出卷绕部件以形成穿出段，通过将穿出段也卷绕于卷绕部件，能够实现在卷绕部件转动一圈时通过从隔离膜的来料侧拉入新的隔离膜的同时也卷入穿出段，从而不必增加新的隔离膜的供料机构也能实现上述电极组件的工业化生产，降低了对现有的卷绕设备的改进幅度以及改进成本。
基于上述思路，本申请的发明人提出了一种技术方案，在卷绕部件的拉出侧进一步设置牵引机构，先通过牵引机构牵引隔离膜的穿出段至预设值，再使用卷绕部件开始卷绕，以成型上述安全性能较高的电极组件，不仅能够实现该电极组件的工业化生产，还能够提高该电极组件的制造效率。
图1示出的是本申请的一些实施例的卷绕设备的结构示意图；图2示出的是本申请的一些实施例的卷绕设备所卷绕成型的电极组件的剖面图。
如图1和图2所示，本申请的一些实施例提出一种卷绕设备100，用于卷绕成型电极组件200，卷绕设备100包括卷绕部件110和四个供料机构(图中没有示出)。
本申请的实施例描述的电极组件200所适用的电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等，本申请实施例对此并不限定。但为描述简洁，下述实施例均以锂离子电池中的电极组件的卷绕过程为例进行说明。
如图1和图2所示，电极组件200包括层叠卷绕设置的负极极片210、正极极片220、第一隔离膜233和第二隔离膜234，第一隔离膜233和第二隔离膜234先于负极极片210和正极极片220卷入。对于卷绕部件110卷绕一圈所卷入的层叠设置的第一隔离膜233和第二隔离膜234中，第二隔离膜234位于第一隔离膜233的内侧(即靠近卷绕轴线的一侧)。负极极片210在第一隔离膜233和第二隔离膜234卷绕至少一圈后进入第一隔离膜233和第二隔离膜234之间，以卷入卷绕部件110；正极极片220在负极极片210卷绕一圈后进入第二隔离膜234的远离负极极片210的一侧，以卷入卷绕部件110。
可以理解的是，本申请中的一圈是指，从电极组件200的某个点为起始点，沿卷绕方向一周到达另一个点，该另一个点与起始点的连线沿电极组件的径向延伸。本申请中的半圈是指一圈的一半，本领域技术人员应理解其他圈数的含义，在此不进一步赘述。
如图1所示，卷绕部件110用于卷绕成型电极组件200，四个供料机构(图中未示出)设置于卷绕部件110的来料侧114，四个供料机构分别用于向卷绕部件110提供负极极片210、正极极片220、第一隔离膜233和第二隔离膜234。
如图1所示，卷绕部件110包括一对卷针111，每个卷针111呈半圆柱形或者半椭圆柱形，一对卷针111共同拼合形成圆柱形或者椭圆柱形的外周面的卷绕部件110，一对卷针111共同转动，以将负极极片210、正极极片220、第一隔离膜233和第二隔离膜234卷绕于卷绕部件110的外周面。为了描述简便，第一隔离膜233和第二隔离膜234统称为隔离膜230。
一对卷针111之间具有供隔离膜230穿过的间隙112，一对卷针111的形成间隙112的一侧设置有一对隔离膜夹持部113。在隔离膜230穿过间隙112后，一对隔离夹持部共同夹持隔离膜230，卷绕部件110再开始卷绕成型电极组件200。其中，卷绕 部件110的转动方向为第一方向P。
如图1所示，本申请的一些实施例提出一种卷绕设备100，用于卷绕成型电极组件200，卷绕设备100包括卷绕部件110和牵引机构120，牵引机构120被配置为在隔离膜230穿出卷绕部件110之后牵引隔离膜230的穿出段231，以使穿出段231的长度达到预设值。其中，卷绕部件110被配置为在穿出段231的长度达到预设值后开始卷绕，以成型电极组件200。
间隙112的对应卷绕部件110的来料侧114的一端为第一端1121，另一端为第二端1122，隔离膜230从第一端1121进入间隙112，从第二端1122穿出间隙112。可以理解的是，在卷绕部件110的转动过程中，间隙112的第一端1121和第二端1122的朝向也是在不断变化的。如图1所示，在本申请的一些实施例中，间隙112为直线形，第一端1121和第二端1122分别位于卷绕部件110的径向的相对的两侧；在其他实施例中，间隙112也可以为折线形，第一端1121和第二端1122围绕卷绕部件110的周向呈90°、150°夹角等。
隔离膜230的穿出段231指的是，隔离膜230的穿出卷绕部件110的部分，即隔离膜230的端部232与间隙112的第二端1122之间的部分。其中，隔离膜230的在间隙112的第二端1122穿出的位置为穿出段231的起始端2311，隔离膜230的端部232为穿出段231的尾端。牵引机构120可以通过作用于穿出段231的尾端(即隔离膜230的端部232)来牵引隔离膜230移动，也可以通过作用于穿出段231的中部(即穿出段231的起始端2311与尾端之间的部分)来牵引隔离膜230移动。牵引机构120可以自动化牵引穿出段231移动，也可以通过手动驱动的方式牵引穿出段231移动。
卷绕部件110还包括来料侧114对应的拉出侧115，牵引机构120设置于卷绕部件110的拉出侧115，用于牵引从隔离膜230的穿出段231移动，以将隔离膜230从间隙112的第二端1122拉出。如图1所示，在本申请的一些实施例中，卷绕部件110的来料侧114和拉出侧115可以分别位于其径向的相对的两侧，以合理布置来料机构和牵引机构120；在其他实施例中，卷绕部件110的来料侧114和拉出侧115也可以分别围绕卷绕部件110的周向呈一定角度设置。
本申请实施例的卷绕设备100包括牵引机构120，牵引机构120能够牵引隔离膜230的穿出段231移动，以使穿出段231的长度达到预设值，隔离膜230的穿出段231也卷入卷绕部件110，使隔离膜230的穿出段231与新进入卷绕部件110的隔离膜230层叠设置以使内圈的负极极片210和正极极片220之间的隔离膜230具有多层隔离膜，在析锂现象发生时锂枝晶不容易刺穿隔离膜而导致负极极片210和正极极片220相接触进而引发电极组件200内部短路。使用该卷绕设备100卷绕成型的电极组件200具有较高的安全性能，且该卷绕设备100能够实现该种电极组件200的工业化生产，提高该种电极组件200的制造效率。
图3示出的是本申请的一些实施例的卷绕设备中牵引机构的一种牵引件处于第一位置的状态示意图；图4示出的是本申请的一些实施例的卷绕设备中牵引机构的一种牵引件处于第二位置的状态示意图。
如图3和图4所示，在本申请的一些实施例中，牵引机构120包括牵引件121和驱动件122，驱动件122用于驱动牵引件121在第一位置和第二位置之间移动，牵引件121被配置为在由第一位置向第二位置移动的过程中牵引穿出段231。
牵引件121在第一位置和第二位置之间的移动路径可以为直线，也可以为曲线；如图4所示，在本申请的一些实施例中，牵引件121沿着第二方向的第一子方向Q1从第一位置移动至第二位置，牵引件121的移动路径为直线。
牵引件121可以通过夹持的方式作用于隔离膜230的穿出段231，也可以以真空吸附的方式作用于隔离膜230的穿出段231，或者通过顶推隔离膜230的中部将隔离膜230的穿出段231拉出。
第一位置为牵引件121开始作用于隔离膜230的穿出段231的位置，第二位置为牵引件121牵引隔离膜230的穿出段231移动以使穿出段231的长度为预设值的位置，牵引件121由第一位置向第二位置移动，将隔离膜230从间隙112的第二端1122向外拉出，使穿出段231的长度不断变长，直至穿出段231的长度达到预设值。
第一位置与卷绕部件110开始卷绕之前其间隙112的第二端1122的位置对应，以便于牵引件121于第一位置作用于隔离膜230。第二位置可以位于第一位置的水平方向上的一侧，也可以位于第一位置的重力方向G上的下方，也可以位于第一位置的其他方向上的一侧。
牵引件121安装于驱动件122的执行端，驱动件122带动牵引件121在第一位置和第二位置之间移动。基于前述的牵引件121的移动路径为直线的实施方式，驱动件122可以为直线气缸、电推杆等常见的直线驱动机构；基于前述的牵引件121的移动路径为曲线的实施方式，驱动件122也可以为带动力的转盘等转动驱动机构，以驱动牵引件121围绕驱动件122的周向移动。
牵引机构120还可以包括导轨组件，牵引件121滑动安装于导轨组件，通过导轨组件引导牵引件121在第一位置和第二位置之间移动。
在上述方案中，在驱动件122的驱动下，牵引件121在由第一位置向第二位置移动的过程中牵引隔离膜230的穿出段231，从而能够实现自动化牵引隔离膜230的穿出段231以使其达到预设值。
图5示出的是本申请的一些实施例的卷绕设备中卷绕部件卷绕以带动牵引件向第一位置移动的状态示意图。
如图5所示，在本申请的一些实施例中，牵引件121被配置为在卷绕部件110开始卷绕后从第二位置回到第一位置，且在回到第一位置的过程中向隔离膜230提供张紧力。
牵引件121由第一位置向第二位置移动的路径和由第二位置向第一位置移动路径可以相同，也可以不同。在本申请的一些实施例中，牵引件121沿着由第一位置向第二位置移动的原路径从第二位置回到第一位置，即沿着第二方向的第二子方向Q2从第二位置移动至第一位置。
当牵引件121牵引隔离膜230的穿出段231移动至第二位置后，卷绕部件110围绕第一方向P转动，将穿出段231卷绕于卷绕部件110，穿出段231的长度变短，直至全部卷入卷绕部件110。在牵引件121沿着第二方向的第二子方向Q2由第二位置移动至第一位置的过程中，牵引件121持续作用于穿出段231的未卷入卷绕部件110的部分，以张紧穿出段231的未卷入卷绕部件110的部分。
实现牵引件121向隔离膜230提供张紧力的实施方式有多种，可以是由驱动件122自身提供张紧力，也可以设置其他的弹性件来提供张紧力。例如，基于驱动件122为直线气缸的实施方式，可以将直线气缸设置为卸力状态，通过直线气缸内部气压值形成阻尼；再例如，牵引机构120还可以包括弹簧，弹簧的一端固定设置，另一端抵接于牵引件121，在牵引件121由第二位置向第一位置移动的过程中，弹簧的另一端向牵引件121施加朝向第二位置的作用力。
在上述方案中，在卷绕部件110开始卷绕后，牵引件121在由第二位置回到第一位置的过程中张紧隔离膜230，使隔离膜230的穿出段231紧绕于卷绕部件110，且 不会发生褶皱，提高了隔离膜230的卷绕质量，使电极组件200具有较好的安全性能。
图6示出的是本申请的一些实施例的卷绕设备中牵引机构的牵引件回到第一位置后释放隔离膜的状态示意图。
如图6所示，在本申请的一些实施例中，牵引件121被配置为在卷绕部件110开始卷绕后从第二位置回到第一位置，且在回到第一位置时将隔离膜230释放。
牵引件121回到第一位置时，牵引件121释放隔离膜230，以容许卷绕部件110继续卷入穿出段231的剩余部分。
第一位置可以位于卷绕部件110的重力方向G的下方，也可以位于卷绕部件110的其他位置，例如斜下方或者水平方向上的一侧等。
在上述方案中，牵引件121在由第二位置回到第一位置时释放隔离膜230，卷绕部件110继续卷绕以将隔离膜230的穿出段231的剩余部分卷入卷绕部件110，以成型电极组件200。
如图6所示，在本申请的一些实施例中，在牵引件121处于所述第一位置时，沿重力方向G，牵引件121位于卷绕部件110的下方。
牵引件121处于第一位置时，牵引件121可以位于卷绕部件110沿重力方向G的正下方，也可以位于卷绕部件110沿重力方向G的斜下方。
在上述方案中，牵引件121处于第一位置时位于卷绕部件110的下方，在牵引件121回到第一位置且释放隔离膜230后，隔离膜230的穿出段231的剩余部分沿着重力方向G自然下垂，隔离膜230的穿出段231的剩余部分进入卷绕部件110的过程中平整无褶皱，提高了隔离膜230的卷绕质量，使电极组件200具有较好的安全性能。
如图5和图6所示，在本申请的一些实施例中，牵引件121的移动方向与重力方向G相交。
牵引件121在第一位置和第二位置之间移动的过程中，其移动路径可以为与重力方向G相交的多个方向。在本申请的一些实施例中，基于前述的牵引件121处于第一位置时位于卷绕部件110沿重力方向G的正下方的实施方式，第二方向为水平方向，牵引件121沿水平方向移动，牵引件121的移动方向和处于第一位置的牵引件121相对于卷绕部件110的方向相互垂直设置，以最大程度地减少牵引件121移动过程中在重力方向G上所占用的空间。在其他实施例中，牵引件121的移动方向和处于第一位置的牵引件121相对于卷绕部件110的方向之间也可以灵活设置。
在上述方案中，牵引件121沿着与重力方向G相交的方向移动，能够使牵引件121在第一位置和第二位置之间移动的路径与重力方向G相交，减少牵引件121移动过程中在重力方向G上所占用的空间，且能够具有较长的行程范围。
如图6所示，在本申请的一些实施例中，牵引件121包括一对第一夹持部1211，一对第一夹持部1211用于夹持隔离膜230的端部232。
一对第一夹持部1211从隔离膜230的厚度方向的两侧共同夹持隔离膜230，一对第一夹持部1211可以为一对气动手指或者电动手指。
一对第一夹持部1211通过夹持隔离膜230的端部232从卷绕部件110的间隙112中拉出穿出段231，一对第一夹持部1211的移动行程即等于穿出段231基于第一位置的拉出长度。
在上述方案中，使用一对夹持部夹持隔离膜230的端部232，能够可靠地牵引隔离膜230的穿出段231移动，从而可靠地拉出隔离膜230的穿出段231至预设长 度。
图7示出的是本申请的一些实施例的卷绕设备的牵引机构中另一种牵引件的结构示意图。
如图7所示，在本申请的一些实施例中，卷绕设备100还包括固定件130，用于固定隔离膜230的端部232，固定件130被配置为在牵引件121回到第一位置时将隔离膜230的端部232释放；其中，牵引件121被配置为顶推隔离膜230的位于固定件130和卷绕部件110之间的部分。
固定件130可以设置于卷绕部件110沿重力方向G的下方；固定件130也可以设置于卷绕部件110的其他方位。固定件130可以通过夹持的方式固定隔离膜230的端部232，固定件130也可以通过吸附方式固定隔离膜230的端部232。
牵引件121可以为沿隔离膜230的宽度方向延伸的长条形的推杆，通过推杆的外周面作用于隔离膜230；牵引件121也可以围绕沿隔离膜230的宽度方向的自身轴线转动的过辊或者滑轮等。
牵引件121设置于固定件130和卷绕部件110之间，用于顶推隔离膜230的穿出段231的中部(即从穿出段231与间隙112的第二端1122至隔离膜230的端部232之间的部分)。
牵引件121可以直接设置于卷绕部件110和固定件130之间的中点位置，其顶推隔离膜230的过程中隔离膜230的作用点至卷绕部件110和固定件130的距离相同，且穿出段231的长度大于牵引件121的移动行程；优选地，当固定件130与卷绕部件110紧邻布置时，穿出段231的长度约为牵引件121的移动行程的两倍，能够明显缩短牵引件121的移动行程，减小其所需要的空间。在其他实施例中，牵引件121还可以位于卷绕部件110和固定件130之间的其他位置，例如位于卷绕部件110和固定件130之间的三分之一位置等。
进一步地，牵引件121和卷绕部件110之间还可以设置有其他的用于引导隔离膜230移动的中间部件(例如下述的定滑轮140)。例如，牵引件121设置于中间部件和固定件130之间的中点位置，其顶推隔离膜230的过程中隔离膜230的作用点至中间部件和固定件130的距离相同，穿出段231从中间部件至尾端的长度大于牵引件121的移动行程。
在上述方案中，固定件130固定隔离膜230的端部232，牵引件121顶推隔离膜230的位于固定件130和卷绕部件110之间的部分，将隔离膜230的穿出段231拉出至预设长度，能够缩短牵引件121在第一位置和第二位置之间移动时的行程长度，减少牵引件121移动过程中所占用的空间。固定件130在牵引件121回到第一位置时释放隔离膜230的端部232，卷绕部件110继续卷绕以将隔离膜230的穿出段231的剩余部分卷入卷绕部件110，以成型电极组件200。
如图7所示，在本申请的一些实施例中，固定件130包括一对第二夹持部131，一对第二夹持部131用于夹持隔离膜230的端部232。
一对第二夹持部131从隔离膜230的厚度方向的两侧共同夹持隔离膜230，一对第二夹持部131可以为一对气动手指或者电动手指。
在上述方案中，使用一对第二夹持部131夹持隔离膜230的端部232，能够可靠地固定隔离膜230的端部232，牵引件121能够可靠地拉出隔离膜230的穿出段231至预设长度。
在本申请的一些实施例中，牵引件121为动滑轮。
具体而言，牵引件121的中心轴线沿隔离膜230的宽度方向延伸，牵引件 121的轴向的两端超出隔离膜230的宽度方向的两端，以沿着隔离膜230的宽度均匀作用于隔离膜230。
在上述方案中，将牵引件121设置为动滑轮，牵引件121顶推隔离膜230移动的过程中可以通过绕其轴线转动来自动调整牵引件121相对于隔离膜230的表面的抵接角度，避免划伤隔离膜230。
图8示出的是图3中的卷绕设备进一步设置定滑轮的结构示意图(没有示出驱动件)；图9示出的是图7中的卷绕设备进一步设置定滑轮的结构示意图。
如图8和图9所示，在本申请的一些实施例中，卷绕设备100还包括定滑轮140，设置于卷绕部件110和牵引件121之间，用于引导隔离膜230移动。
定滑轮140的轴向沿隔离膜230的宽度方向延伸，定滑轮140在其轴向上的两端超出隔离膜230，以沿隔离膜230的宽度方向均匀作用于隔离膜230。
如图8所示，基于前述的牵引件121牵引隔离膜230的端部232移动的实施方式，隔离膜230的穿出段231绕过定滑轮140后改变行进方向，在卷绕部件110转动过程中，隔离膜230的由定滑轮140至牵引件121的部分的行进方向固定不变。如图9所示，基于前述的固定件130固定隔离膜230的端部232、牵引件121顶推隔离膜230的卷绕部件110与固定件130之间的部分的实施方式，隔离膜230的穿出段231绕过定滑轮140后改变行进方向，在卷绕部件110转动过程中，牵引件121顶推隔离膜230以拉出隔离膜230的穿出段231，隔离膜230的经过定滑轮140部位和固定于固定件130的部位位置固定不变。
在上述方案中，通过在卷绕部件110和牵引件121之间设置定滑轮140，能够引导改变隔离膜230的走带方向，降低卷绕部件110转动过程对穿出段231的影响，利于控制穿出段231的从定滑轮140处至隔离膜230的端部232之间的部分的走带方向，不仅利于穿出段231的长度的计算，还能够提高卷绕设备100的工作可靠性。
图10示出的是本申请的一些实施例的卷绕方法的工艺流程图。
如图10所示，本申请的一些实施例还提出一种卷绕方法，用于卷绕成型电极组件200，卷绕方法包括：
S100：将隔离膜230穿过卷绕部件110，隔离膜230的穿出卷绕部件110的部分为穿出段231；
S200：牵引隔离膜230的穿出段231，以使穿出段231的长度达到预设值；
S300：卷绕部件110开始卷绕，以成型所述电极组件200。
为了便于描述，本申请实施例结合卷绕设备100的使用方法来阐述本申请实施例的卷绕方法。可以理解的是，本申请实施例的卷绕方法包括但不局限于使用本申请实施例中的卷绕设备100来实施。
S100：将隔离膜230穿过卷绕部件110，隔离膜230的穿出卷绕部件110的部分为穿出段231，包括：
隔离膜230从一对卷针111之间的间隙112的第一端1121进入间隙112，从第二端1122穿出间隙112，隔离膜230的从第二端1122至端部232之间的部分为穿出段231。
在本申请的一些实施例中，S200：牵引隔离膜230的穿出段231，以使穿出段231的长度达到预设值，包括：
S210：牵引件121由第一位置向第二位置移动以牵引穿出段231,以使穿出段231的长度达到预设值。
在本申请的一些实施例中，S210：牵引件121由第一位置向第二位置移动以牵引穿出段231，以使穿出段231的长度达到预设值,包括：
S211：牵引件121包括一对第一夹持部1211，使用一对第一夹持部1211夹持隔离膜230的端部232，牵引件121由第一位置移动至第二位置，以使穿出段231的长度达到预设值。
在本申请的另一些实施例中，S210：牵引件121由第一位置向第二位置移动以牵引穿出段231，以使穿出段231的长度达到预设值,包括：
S212：牵引件121为动滑轮，使用固定件130固定隔离膜230的端部232，牵引件121顶推隔离膜230的卷绕部件110与固定件130之间的部分且由第一位置移动至第二位置，以使穿出段231的长度达到预设值。
在本申请的一些实施例中，S200：牵引隔离膜230的穿出段231，以使穿出段231的长度达到预设值，包括：
S220：卷绕部件110和牵引件121之间设置定滑轮140，隔离膜230从卷绕部件110的间隙112的第二端1122穿出后，先绕过定滑轮140，再通过牵引件121牵引。
在本申请的一些实施例中，S300：卷绕部件110开始卷绕，以成型所述电极组件200，包括：
S310：牵引件121从第二位置回到第一位置，且在回到第一位置的过程中向隔离膜230提供张紧力；
S320：牵引件121回到第一位置时，牵引件121释放隔离膜230。
在S212：牵引件121为动滑轮，使用固定件130固定隔离膜230的端部232，牵引件121顶推隔离膜230的卷绕部件110与固定件130之间的部分且由第一位置移动至第二位置，以使穿出段231的长度达到预设值的实施方式，S300：卷绕部件110开始卷绕，以成型所述电极组件200，还包括：
S330：牵引件121回到第一位置时，固定件130释放隔离膜230的端部232。
使用本申请实施例的卷绕方法卷绕成型电极组件200，能够将长度为预设值的隔离膜230的穿出段231也卷入卷绕部件110，使隔离膜230的穿出段231与新进入卷绕部件110的隔离膜230层叠设置以使内圈的负极极片210和正极极片220之间的隔离膜230具有多层隔离膜，在析锂现象发生时锂枝晶不容易刺穿隔离膜而导致负极极片210和正极极片220相接触进而引发电极组件200内部短路，使用该卷绕方法卷绕成型的电极组件200具有较高的安全性能。
在本申请的一些实施例中，穿出段231的长度的预设值大于卷绕部件110的周长。
请参照图1所示，基于前述的间隙112的第一端1121和第二端1122位于卷绕部件110的径向的相对的两侧的实施形式，当穿出段231的长度达到预设值后卷绕部件110开始转动。穿出段231从起始端2311起首先直接与卷绕部件接触半个周长值，直至与隔离膜230中的第一隔离膜233层叠设置。当负极极片210插入第一隔离膜233和第二隔离膜234之间以进入卷绕部件110之后，负极极片210的外侧在原有的第一隔离膜233的基础上增加了层叠设置的穿出段231，即负极极片210的隔离膜层数为三层。正极极片220从第二隔离膜234的内侧进入卷绕部件110之后，正极极片220与之前卷入的负极极片210的外侧相对设置，即正极极片220的最内圈与其内侧的负极极片210之间的隔离膜层数为三层。穿出段231继续层叠卷绕部件110的半个周 长值，能够覆盖正极极片220的最内圈的第一个弯折区235，从而保护正极极片220的最内圈的首个弯折区235在发生析锂时不会导致电极组件200短接。
在上述方案中，穿出段231的预设值大于卷绕部件110的周长，能够至少在正极极片220的最内圈的第一个弯折区235(请参照图2)与其内侧的负极极片210之间设置多层隔离膜，从而避免正极极片220的最内圈的第一个弯折区235(请参照图2)的内侧发生析锂时锂析晶刺穿隔离膜，能够明显改善电极组件200的安全性能。
在其他实施例中，当需要保护正极极片220的最内圈的第一个和第二个弯折区235不受析锂影响时，预设值可以大于卷绕部件110的周长的1.5倍；以此类推，沿着正极极片220从最内圈向外卷绕延伸的方向，每多保护一个弯折区235，预设值的长度增加卷绕部件的一个周长长度，本文不再举例。
图11示出的是图3中的卷绕设备的卷绕过程示意图；图12示出的是图7中的卷绕设备的卷绕过程示意图。
如图1至图6以及图11所示，本申请的一些实施例提出一种卷绕设备100，用于卷绕成型电极组件200，卷绕设备100包括卷绕部件110、牵引机构120和定滑轮140。牵引机构120包括牵引件121，定滑轮140固定设置于卷绕部件110的下方，牵引件121可以在第一位置和第二位置之间移动。其中，牵引件121包括一对第一夹持部1211。隔离膜230从卷绕部件110中穿过后绕过定滑轮140，牵引件121于定滑轮140的下方移动，以拉出隔离膜230的穿出段231。
该卷绕设备100的卷绕方法如下：
隔离膜230穿过卷绕部件110，端部232暴露出卷绕部件110；
卷绕部件110开始卷绕之前，牵引件121的一对第一夹持部1211夹持隔离膜230的端部232；
牵引件121带动隔离膜230的端部232沿着第一子方向Q1由第一位置向第二位置移动，将隔离膜230拉出，直至穿出段231的长度为预设值，其中，预设值为L1+L2，且预设值的长度大于卷绕部件110的周长；
卷绕部件110沿第一方向P开始卷绕，与此同时，牵引件121夹持住隔离膜230的端部232沿第二子方向Q2倒退，以张紧隔离膜的穿出段231；
牵引件121回到第一位置后，牵引件121释放隔离膜230的端部232，卷绕部件110继续卷绕，以将穿出段231全部卷入卷绕部件110，从而得到特殊结构的电极组件200。
如图7至图9以及图12所示，本申请的一些实施例提出一种卷绕设备100，用于卷绕成型电极组件200，卷绕设备100包括卷绕部件110、牵引机构120、固定件130和定滑轮140。牵引机构120包括牵引件121，定滑轮140固定设置于卷绕部件110的下方，牵引件121可以在第一位置和第二位置之间移动。其中，牵引件121为动滑轮。隔离膜230从卷绕部件110中穿过后绕过定滑轮140，固定件130固定设置于定滑轮140的下方，固定件130包括一对第二夹持部131，一对第二夹持部131用于夹持隔离膜230的端部232。牵引件121设置于固定件130与定滑轮140之间，牵引件121能够顶推隔离膜230，以拉出隔离膜230的穿出段231。
该卷绕设备100的使用方法如下：
隔离膜230穿过卷绕部件110，端部232暴露出卷绕部件110；
卷绕部件110开始卷绕之前，固定件130固定夹持隔离膜230的端部232；
牵引件121顶推隔离膜230的位于定滑轮140和固定件130之间的部分，沿着第一子方向Q1由第一位置向第二位置移动，以将隔离膜230从卷绕部件110中拉 出，直至穿出段231的长度为预设值，其中，预设值为L1+L3+L4，且预设值的长度大于卷绕部件110的周长；
卷绕部件110沿第一方向P开始卷绕，与此同时，牵引件121顶推于隔离膜230且沿第二子方向Q2倒退，以张紧隔离膜230的穿出段231；
牵引件121回到第一位置后，牵引件121释放隔离膜230，固定件130释放隔离膜230的端部232，卷绕部件110继续卷绕，以将穿出段231全部卷入卷绕部件110，从而得到特殊结构的电极组件200。
本申请实施例的卷绕设备100包括卷绕部件110和牵引机构120，能够将隔离膜230的穿出段231的长度拉伸至预设值，卷绕部件110卷绕时能够卷入穿出段231，形成一种特殊结构的电极组件200。该电极组件200的正极极片220的最内圈与其内侧的负极极片210之间具有多层隔离膜，可以避免该处产生析锂时锂析晶将正极极片220和负极极片210短接导致电极组件200内部发生短路，具备较高的安全性能。使用该卷绕设备100以及卷绕方法卷绕成型该电极组件200，不仅能够实现该电极组件200的工业化生产，还能够提高该电极组件200的制造效率。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。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 (13)

  1. 一种卷绕设备，用于卷绕成型电极组件，所述卷绕设备包括：
    卷绕部件；
    牵引机构，所述牵引机构被配置为在隔离膜穿出所述卷绕部件之后牵引所述隔离膜的穿出段，以使所述穿出段的长度达到预设值；
    其中，所述卷绕部件被配置为在所述穿出段的长度达到所述预设值后开始卷绕，以成型所述电极组件。
  2. 根据权利要求1所述的卷绕设备，其中，所述牵引机构包括牵引件和驱动件，所述驱动件用于驱动所述牵引件在第一位置和第二位置之间移动，所述牵引件被配置为在由所述第一位置向所述第二位置移动的过程中牵引所述穿出段。
  3. 根据权利要求2所述的卷绕设备，其中，所述牵引件被配置为在所述卷绕部件开始卷绕后从所述第二位置回到所述第一位置，且在回到所述第一位置的过程中向所述隔离膜提供张紧力。
  4. 根据权利要求2或3所述的卷绕设备，其中，所述牵引件被配置为在所述卷绕部件开始卷绕后从所述第二位置回到所述第一位置，且在回到所述第一位置时将所述隔离膜释放。
  5. 根据权利要求2-4任一项所述的卷绕设备，其中，在所述牵引件处于所述第一位置时，沿重力方向，所述牵引件位于所述卷绕部件的下方。
  6. 根据权利要求5所述的卷绕设备，其中，所述牵引件的移动方向与所述重力方向相交。
  7. 根据权利要求2-6任一项所述的卷绕设备，其中，所述牵引件包括一对第一夹持部，所述一对第一夹持部用于夹持所述隔离膜的端部。
  8. 根据权利要求2-7任一项所述的卷绕设备，其中，所述卷绕设备还包括：
    固定件，用于固定所述隔离膜的端部，所述固定件被配置为在所述牵引件回到所述第一位置时将所述隔离膜的端部释放；
    其中，所述牵引件被配置为顶推所述隔离膜的位于所述固定件和所述卷绕部件之间的部分。
  9. 根据权利要求8所述的卷绕设备，其中，所述固定件包括一对第二夹持部，所述一对第二夹持部用于夹持所述隔离膜的端部。
  10. 根据权利要求2-9任一项所述的卷绕设备，其中，所述牵引件为动滑轮。
  11. 根据权利要求2-10任一项所述的卷绕设备，其中，所述卷绕设备还包括：
    定滑轮，设置于所述卷绕部件和所述牵引件之间，用于引导所述隔离膜移动。
  12. 一种卷绕方法，用于卷绕成型电极组件，所述卷绕方法包括：
    将隔离膜穿过卷绕部件，所述隔离膜的穿出所述卷绕部件的部分为穿出段；
    牵引所述隔离膜的所述穿出段，以使所述穿出段的长度达到预设值；
    所述卷绕部件开始卷绕，以成型所述电极组件。
  13. 根据权利要求12所述的卷绕方法，其中，所述预设值大于所述卷绕部件的周长。
PCT/CN2022/144243 2022-01-28 2022-12-30 卷绕设备以及卷绕方法 WO2023142897A1 (zh)

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JP2002110486A (ja) * 2000-09-29 2002-04-12 Ckd Corp 巻取装置及び巻取方法
JP2003048647A (ja) * 2001-08-03 2003-02-21 Nippei Toyama Corp 電極シートの巻取り機
CN102163733A (zh) * 2010-12-14 2011-08-24 惠州亿纬锂能股份有限公司 一种电芯卷绕方法和设备
JP2015232966A (ja) * 2014-06-10 2015-12-24 株式会社Ｇｓユアサ 蓄電素子
CN110690494A (zh) * 2019-10-15 2020-01-14 无锡先导智能装备股份有限公司 电芯卷绕设备及制造卷绕电芯的方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002110486A (ja) * 2000-09-29 2002-04-12 Ckd Corp 巻取装置及び巻取方法
JP2003048647A (ja) * 2001-08-03 2003-02-21 Nippei Toyama Corp 電極シートの巻取り機
CN102163733A (zh) * 2010-12-14 2011-08-24 惠州亿纬锂能股份有限公司 一种电芯卷绕方法和设备
JP2015232966A (ja) * 2014-06-10 2015-12-24 株式会社Ｇｓユアサ 蓄電素子
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