WO2023134543A1 - 一种卷针、卷绕机、电芯卷绕方法 - Google Patents

一种卷针、卷绕机、电芯卷绕方法 Download PDF

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Publication number
WO2023134543A1
WO2023134543A1 PCT/CN2023/070740 CN2023070740W WO2023134543A1 WO 2023134543 A1 WO2023134543 A1 WO 2023134543A1 CN 2023070740 W CN2023070740 W CN 2023070740W WO 2023134543 A1 WO2023134543 A1 WO 2023134543A1
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WO
WIPO (PCT)
Prior art keywords
needle
winding
connecting piece
piece
length direction
Prior art date
Application number
PCT/CN2023/070740
Other languages
English (en)
French (fr)
Inventor
张小畏
张威
白清林
温裕乾
唐鸣浩
张盛武
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to EP23739887.0A priority Critical patent/EP4398374A1/en
Publication of WO2023134543A1 publication Critical patent/WO2023134543A1/zh
Priority to US18/735,198 priority patent/US20240317528A1/en

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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
    • H01M10/05—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
    • B65H19/2292—Removing cores or mandrels from web roll after winding
    • 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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/417—Handling or changing web rolls
    • B65H2301/418—Changing web roll
    • B65H2301/4185—Core or mandrel discharge or removal, also organisation of core removal
    • B65H2301/41852—Core or mandrel discharge or removal, also organisation of core removal by extracting mandrel from wound roll, e.g. in coreless applications
    • B65H2301/418526—Core or mandrel discharge or removal, also organisation of core removal by extracting mandrel from wound roll, e.g. in coreless applications by movement of the mandrel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2401/00—Materials used for the handling apparatus or parts thereof; Properties thereof
    • B65H2401/10—Materials
    • B65H2401/13—Coatings, paint or varnish
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2401/00—Materials used for the handling apparatus or parts thereof; Properties thereof
    • B65H2401/20—Physical properties, e.g. lubricity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/18—Form of handled article or web
    • B65H2701/184—Wound packages
    • B65H2701/1842—Wound packages of webs
    • B65H2701/18422—Coreless
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • 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 field of batteries, in particular to a winding needle, a winding machine, and a battery winding method.
  • Lithium-ion batteries have the advantages of small size, high energy density, high power density, many cycle times and long storage time, and have been widely used in some electronic equipment, electric vehicles, electric toys and electric equipment, for example, lithium-ion Batteries are currently widely used in mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, and so on.
  • the most common preparation method of the battery cell is to put the positive pole piece, the negative pole piece and the separator on the rolling needle. Formed by winding multiple times.
  • the size of the electric core prepared by this method is limited by the size of the winding needle, that is, a sufficiently long winding needle needs to be used when preparing a long-length electric core, but when the length of the winding needle becomes longer, the winding needle The rigidity often does not meet the requirement again, thereby urgently needs a kind of novel roll needle to solve the above-mentioned technical problem.
  • the present application proposes a winding needle, a winding machine, and a battery winding method.
  • the stiffness of the winding needle is improved, and the efficiency and quality of the winding operation are improved.
  • a rolling needle comprising:
  • the first connecting piece; and the second connecting piece, used for combining with the first connecting piece, the second connecting piece is arranged coaxially with the first connecting piece, and the combined length of the first connecting piece and the second connecting piece is greater than that of the first connecting piece The length of the connector or the second connector.
  • the first connecting part and the second connecting part By coaxially combining the first connecting part and the second connecting part to form a needle whose length is longer than that of the first connecting part or the second connecting part, it is possible to ensure the winding length of the needle without increasing the diameter of the needle
  • the overall rigidity of the winding needle can be improved, the bending deformation of the winding needle during the winding process can be reduced, and the demand for winding wide and long batteries can be met.
  • the small diameter of the winding needle can increase the energy density of the battery core wound by the winding needle, thereby improving the efficiency and quality of the winding operation.
  • the first connector includes two ends along its own length direction; the second connector also includes two ends along its own length direction; one end of the first connector along its length direction is connected to the second connector Combine along one end of its length.
  • first connecting piece and the second connecting piece By combining the ends of the first connecting piece and the second connecting piece, it is convenient to arrange the first connecting piece and the second connecting piece coaxially, and it is also convenient to limit the length of the first connecting piece and the second connecting piece according to the length of the rolling needle .
  • one end of the first connecting member along its length direction is connected to one end of the second connecting member along its length direction by plugging.
  • the first connecting part and the second connecting part can support each other, and the two form a whole, thereby improving the overall rigidity of the winding needle.
  • one end of the first connecting piece along its length direction is combined with one end of the second connecting piece along its lengthwise direction by being spaced apart.
  • the length of the first connecting part and the second connecting part can be further shortened on the basis of ensuring the overall length of the rolling needle, thereby improving the overall rigidity of the rolling needle.
  • the diameters of the first connecting piece and the second connecting piece can be further reduced under the condition that the overall rigidity of the needle is satisfied, so as to improve the speed of winding by the rolling needle. The energy density of the cell.
  • the winding needle further includes an intermediate connecting piece, and one end of the first connecting piece along its length direction is combined with one end of the second connecting piece along its lengthwise direction through the intermediate connecting piece.
  • the first connecting piece, the intermediate connecting piece and the second connecting piece form a whole and can support each other, thereby improving the overall rigidity of the winding needle .
  • the intermediate connector remains inside the battery core, and can also support the inner ring of the battery core and maintain the structure of the battery core.
  • the intermediate connecting piece includes a connecting rod, and the two ends of the connecting rod are respectively inserted into one end of the first connecting piece along its length direction and one end of the second connecting piece along its lengthwise direction.
  • the connecting rod By using the connecting rod to connect the ends of the first connecting part and the second connecting part, the first connecting part, the connecting rod and the second connecting part form a whole and can support each other, which can significantly improve the overall rigidity of the rolling needle.
  • the connecting rod is a solid rod or a hollow rod.
  • connection rod as solid or hollow can connect the first connecting part and the second connecting part.
  • the solid connecting rod has higher structural strength. If the width of the wound pole piece and the separator is wider, a solid connection can be used pole.
  • the intermediate connector includes a hollow sleeve, and the first connector and the second connector are respectively inserted into the hollow sleeve from both ends of the hollow sleeve.
  • the first connecting piece, the hollow sleeve and the second connecting piece form a whole and can support each other, which can significantly improve the overall rigidity of the rolling needle.
  • first connecting part and the second connecting part are connected in the hollow sleeve, or are arranged at intervals.
  • the first connecting piece and the second connecting piece are connected or arranged at intervals in the hollow sleeve, both of which can be socketed with the hollow sleeve, and the structural strength of the connection is higher, if the width of the wound pole piece and the separator is wider , can adopt the connected structure.
  • the hollow sleeve is provided with several ventilation holes.
  • first connecting piece, the second connecting piece and the hollow sleeve are in a relatively close connection relationship, by setting the vent holes, it is convenient for the first connecting piece and the second connecting piece to be inserted into the hollow sleeve, and at the same time avoid causing excessive pressure in the hollow sleeve And deformation.
  • the surfaces of the first connecting part and the second connecting part are provided with a coating that reduces the frictional force generated when they are pulled out from the battery core.
  • the first connector and the second connector are easily pulled away from the battery core when the needle is withdrawn after winding, which will not cause the pole piece and separator of the core to shift, avoiding the Pulling the core ensures the quality of the battery.
  • the other end of the first connecting piece along its length direction is provided with a radial connection hole
  • the other end of the second connecting piece along its length direction is also provided with a radial connection hole, the first connecting piece and the second connecting piece
  • the connecting piece is configured to be fixed to the winder through the connecting hole.
  • the winding machine is provided with positioning pins or positioning screws corresponding to the connecting holes, and the first connecting piece and the second connecting piece are fixed on the winding machine through the radial connecting holes, which is convenient for disassembly and assembly.
  • a winding machine comprising the winding needle described in any one of the above items.
  • the rigidity of the coiling needle is improved so that the coiling needle can withstand greater centrifugal force, and it is not easy to deflect and deform under high-speed rotation, so the acceleration, deceleration and maximum speed of the winding machine can be improved. Winding speed, improve winding efficiency and reduce production cost.
  • the winding machine includes a needle retractable mechanism, and the first connecting member and the second connecting member are mounted on the needle retractable mechanism so as to approach or move away from each other driven by the needle retractable mechanism.
  • a battery winding method including:
  • Winding the pole piece and the isolation film with a rolling needle wherein the rolling needle is the rolling needle described in any one of the above.
  • Fig. 1 shows a schematic front view of a roller needle according to some embodiments of the present application
  • Fig. 2 shows a sectional view along A-A in Fig. 1;
  • Fig. 3 shows an exploded schematic diagram of a rolling needle according to some embodiments of the present application
  • Fig. 4 shows a schematic view of the use state of the roller needle according to some embodiments of the present application
  • Fig. 5 shows a schematic front view of a rolling needle according to some embodiments of the present application
  • Figure 6 shows a sectional view along B-B in Figure 5;
  • Fig. 7 shows a schematic front view of a rolling needle according to some embodiments of the present application.
  • Figure 8 shows a sectional view along C-C in Figure 7;
  • Fig. 9 shows an exploded schematic diagram of a roller needle according to some embodiments of the present application.
  • Figure 10 shows a schematic front view of a connecting rod according to some embodiments of the present application.
  • Fig. 11 shows a schematic view of the use state of the rolling needle according to some embodiments of the present application.
  • Fig. 12 shows a schematic front view of a rolling needle according to some embodiments of the present application.
  • Figure 13 shows a sectional view along D-D in Figure 12;
  • Fig. 14 shows an exploded schematic diagram of a roller needle according to some embodiments of the present application.
  • Figure 15 shows a schematic front view of a hollow sleeve according to some embodiments of the present application.
  • Fig. 16 shows a schematic view of the use state of the rolling needle according to some embodiments of the present application
  • Fig. 17 shows a schematic cross-sectional view of a roller needle according to some embodiments of the present application.
  • Fig. 18 shows an exploded schematic diagram of a rolling needle according to some embodiments of the present application.
  • first, second and the like in the description and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific sequence or primary-subordinate relationship.
  • first and second are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features.
  • a feature defined as “first” and “second” may explicitly or implicitly include one or more of these features.
  • plural means two or more.
  • connection In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms “installation”, “connection”, “connection” and “attachment” should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.
  • Lithium-ion batteries (referring to: battery cells) mainly rely on lithium ions to move between the positive pole and the negative pole to work.
  • Li-ion batteries use an intercalated lithium compound as an electrode material.
  • the main positive electrode materials used for lithium-ion batteries are: lithium cobalt oxide (LiCoO2), lithium manganate (LiMn2O4), lithium nickelate (LiNiO2) and lithium iron phosphate (LiFePO4).
  • a separator is arranged between the positive pole piece and the negative pole piece to form a thin film structure with three layers of materials.
  • the thin film structure is generally wound or stacked to form a desired shape of the cell. For example, a thin film structure of three layers of material in a cylindrical battery is wound into a cylindrical shaped cell, while a thin film structure in a prismatic battery is wound or stacked into a roughly rectangular parallelepiped shaped cell.
  • the size of the lithium-ion battery prepared by the winding method is limited by the size of the winding needle, that is, it is necessary to use a long enough winding needle when preparing a long-length lithium-ion battery, but only when the length of the winding needle changes Long, the rigidity of the rolling needle often does not meet the requirements.
  • the applicant increased the diameter of the coiling pin, but after increasing the diameter of the coiling pin, the applicant found that the volume of the battery would be too much occupied by the coiling pin, thereby reducing the energy density of the battery.
  • the applicant has designed a new type of rolling needle, which includes a first connecting piece and a second connecting piece, the second connecting piece is used to combine with the first connecting piece, and the second connecting piece is combined with the first connecting piece Coaxial arrangement, and the combined length of the first connecting piece and the second connecting piece is greater than the length of the first connecting piece or the second connecting piece.
  • the new type of winding needle increases the stiffness of the winding needle while extending the length of the winding needle, improving the efficiency and quality of the winding operation.
  • the energy density of the battery core wound using the winding needle can be improved.
  • Fig. 1, Fig. 2 and Fig. 3 it is a needle roll according to an embodiment of the present application, including a first connecting part 1 and a second connecting part 2, and the second connecting part 2 is used to connect with the first connecting part 1
  • the second connecting part 2 is arranged coaxially with the first connecting part 1 , and the combined length of the first connecting part 1 and the second connecting part 2 is greater than the length of the first connecting part 1 or the second connecting part 2 .
  • the winding length of the needle can be guaranteed without increasing the
  • the diameter of the winding needle can increase the overall stiffness of the winding needle, reduce the bending deformation of the winding needle during the winding process, and meet the needs of winding wide and long batteries.
  • the small diameter of the winding needle can increase the energy density of the battery core wound by the winding needle, thereby improving the efficiency and quality of the winding operation.
  • the first connector 1 includes two ends along its own length direction; the second connector 2 also includes two ends along its own length direction; the first connector One end along the length direction of 1 is combined with one end of the second connecting piece 2 along the length direction.
  • first connecting piece 1 and the second connecting piece 2 By combining the ends of the first connecting piece 1 and the second connecting piece 2, it is convenient to arrange the first connecting piece 1 and the second connecting piece 2 coaxially, and it is also convenient to define the first connecting piece 1 and the second connecting piece 2 The ratio of the length to the overall length of the needle.
  • the first connector 1 includes a first combination end 103 , a first body portion 102 , and a first fixed end 101
  • the second connector 2 includes a second combination end 203 and a second body portion 202 , the second fixed end 201 .
  • the part of the first connector 1 wrapped around the cell is the first body part 102
  • the part of the second connector 2 wrapped around the cell is the second body part 202
  • the cross sections of the first body part 102 and the second body part 202 It is: a circle, an ellipse, a polygon with more than three sides, a polygon with smooth transitions at the end corners, or a flat shape.
  • the materials of the first connecting piece 1 and the second connecting piece 2 are not limited to commonly used carbon steel, carbon structural steel, high-quality structural steel, carbon tool steel, free-cutting structural steel, alloy steel, ordinary low alloy steel, and engineering structure Alloy steel, alloy steel for mechanical structure, alloy structural steel, alloy tool steel, high-speed tool steel, etc.
  • one end of the first connecting member 1 along its length direction is connected to one end of the second connecting member 2 along its length direction by plugging.
  • the state of the needle-wound pole piece and separator in this embodiment is shown in FIG. 4 , and the diaphragm 5 in FIG. 4 includes a positive pole piece, a negative pole piece and a separator.
  • the first connecting part 1 and the second connecting part 2 can support each other, and the two form a whole, thereby improving the overall rigidity of the winding needle.
  • the first combined end 103 of the first connecting part 1 is provided with a conical, cylindrical or polygonal socket, and the second combined end 203 of the second connecting part 2 is correspondingly provided with a conical, cylindrical or polygonal plug.
  • the plug-in structure it is convenient for the first connecting part 1 and the second connecting part 2 to be coaxial.
  • one end of the first connecting member 1 along its length direction is combined with one end of the second connecting member 2 along its length direction by being spaced apart.
  • the lengths of the first connecting part 1 and the second connecting part 2 can be further shortened, thereby improving the overall rigidity of the winding needle.
  • the diameters of the first connecting piece 1 and the second connecting piece 2 can also be further reduced, thereby increasing the energy density of the battery cell.
  • the winding needle further includes an intermediate connecting piece, and one end of the first connecting piece 1 along its length direction is combined with one end of the second connecting piece 2 along its lengthwise direction through the intermediate connecting piece.
  • the first connector 1, the intermediate connector and the second connector 2 form a whole and can support each other, thereby improving the rolling capacity.
  • the overall stiffness of the needle By using the intermediate connector to connect the ends of the first connector 1 and the second connector 2, the first connector 1, the intermediate connector and the second connector 2 form a whole and can support each other, thereby improving the rolling capacity.
  • the overall stiffness of the needle By using the intermediate connector to connect the ends of the first connector 1 and the second connector 2, the first connector 1, the intermediate connector and the second connector 2 form a whole and can support each other, thereby improving the rolling capacity.
  • the overall stiffness of the needle By using the intermediate connector to connect the ends of the first connector 1 and the second connector 2, the first connector 1, the intermediate connector and the second connector 2 form a whole and can support each other, thereby improving the rolling capacity.
  • the overall stiffness of the needle By using the intermediate connector to connect the ends of the first connector 1 and the second connector 2, the first connector 1, the intermediate connector and the second connector 2 form a whole and can support each other, thereby improving the
  • the intermediate connector When the winding is completed and the needle is withdrawn, the intermediate connector remains inside the battery core, and can also support the inner ring of the battery core and maintain the structure of the battery core.
  • the material of the intermediate connector is plastic, and it will not affect the electrical performance of the battery if it remains in the battery cell.
  • the intermediate connecting member includes a connecting rod 3, and the two ends of the connecting rod 3 are respectively connected with one end of the first connecting member 1 along its length direction and the second connecting rod.
  • One end of the two connectors 2 along their length direction is plugged in.
  • the status of the needle-wound pole piece and separator in this embodiment is shown in FIG. 11 , and the diaphragm 5 in FIG. 11 includes a positive pole piece, a negative pole piece and a separator.
  • the connecting rod 3 By using the connecting rod 3 to connect the ends of the first connecting piece 1 and the second connecting piece 2, the first connecting piece 1, the connecting rod 3 and the second connecting piece 2 form a whole and can support each other, which can significantly improve the rolling capacity.
  • the overall stiffness of the needle By using the connecting rod 3 to connect the ends of the first connecting piece 1 and the second connecting piece 2, the first connecting piece 1, the connecting rod 3 and the second connecting piece 2 form a whole and can support each other, which can significantly improve the rolling capacity.
  • the overall stiffness of the needle By using the connecting rod 3 to connect the ends of the first connecting piece 1 and the second connecting piece 2, the first connecting piece 1, the connecting rod 3 and the second connecting piece 2 form a whole and can support each other, which can significantly improve the rolling capacity.
  • the overall stiffness of the needle By using the connecting rod 3 to connect the ends of the first connecting piece 1 and the second connecting piece 2, the first connecting piece 1, the connecting rod 3 and the second connecting piece 2 form a whole and can support each other, which can significantly improve the rolling capacity.
  • the connecting rod 3 includes a third combined end 301 , a third main body portion 302 and a fourth combined end 303 .
  • the third combination end 301 is inserted into the first combination end 103 of the first connector 1
  • the fourth combination end 303 is inserted into the second combination end 203 of the second connector 2 .
  • the parts where the battery core is wound are mainly the second body part 202 , the third body part 302 , and the first body part 102 .
  • the outer wall of the connecting rod 3 can be provided with a coating that increases the frictional force.
  • the coating that can increase the frictional force By setting the coating that can increase the frictional force, the frictional force between the connecting rod 3 and the diaphragm 5 can be increased, which is convenient for winding and The connecting rod 3 can be stably held inside the battery cell.
  • first combination end 103 and the second combination end 203 are respectively provided with “convex"-shaped connection structures, and correspondingly, the two ends of the connecting rod 3 are respectively provided with “concave”-shaped connection structures.
  • first connecting member 1 , the connecting rod 3 and the second connecting member 2 it is convenient for the first connecting member 1 , the connecting rod 3 and the second connecting member 2 to be coaxial.
  • the connecting rod 3 is made of plastic, and it will not affect the electrical performance of the battery if it remains in the battery.
  • the connecting rod 3 is a solid rod or a hollow rod.
  • the connecting rod 3 shown in Fig. 9 is a hollow rod.
  • connection rod 3 as solid or hollow can connect the first connecting member 1 and the second connecting member 2.
  • the solid connecting rod 3 has higher structural strength. If the width of the wound pole piece and separator is wider, it can be A solid connecting rod 3 is adopted.
  • the hollow connecting rod 3 is provided with several first ventilation holes 304 .
  • first connecting piece 1, the second connecting piece 2 and the connecting rod 3 are in a relatively close connection relationship, by setting the ventilation holes, it is convenient for the first connecting piece 1 and the second connecting piece 2 to be plugged into the connecting rod 3, and at the same time avoid causing The pressure in the connecting rod 3 is too large and deformed.
  • the intermediate connector includes a hollow sleeve 4, and the first connector 1 and the second connector 2 are connected from both ends of the hollow sleeve 4 respectively. Insert the hollow sleeve 4.
  • the state of the needle-wound pole piece and the separator in this embodiment is shown in FIG. 16 , and the diaphragm 5 in FIG. 16 includes a positive pole piece, a negative pole piece and a separator.
  • the first connecting piece 1, the hollow sleeve 4 and the second connecting piece 2 form a whole and can support each other. the overall stiffness.
  • the hollow sleeve 4 includes a fifth combined end 401 , a fourth main body portion 402 and a sixth combined end 403 .
  • the part where the battery core is wound is mainly the fourth body part 402 .
  • the inner wall of the hollow sleeve 4 may be provided with a coating that reduces the frictional force generated when the first connecting piece 1 and the second connecting piece 2 are pulled apart.
  • a coating that can reduce friction the first connecting part 1 and the second connecting part 2 are easily pulled out from the hollow sleeve 4 when the needle is withdrawn after winding, and the hollow sleeve 4 will not be displaced, that is, It will not cause the displacement of the pole piece and the isolation film of the core, avoid core pulling, and ensure the quality of the battery core.
  • the outer wall of the hollow sleeve 4 can also be provided with a coating that increases the friction.
  • a coating that can increase the friction By setting the coating that can increase the friction, the friction between the hollow sleeve 4 and the diaphragm 5 can be increased, which is convenient for rolling. winding, and can keep the hollow sleeve 4 stably inside the battery core.
  • first connecting part 1 and the second connecting part 2 are connected in the hollow sleeve 4, or are arranged at intervals.
  • the first connector 1 and the second connector 2 are connected in the hollow sleeve 4, as shown in Figure 17 and Figure 18, the first connector 1 and the second connector 2 They are arranged at intervals in the hollow casing 4 .
  • the first connection piece 1 and the second connection piece 2 are connected or arranged at intervals in the hollow sleeve 4, both of which can be socketed with the hollow sleeve 4, and the structural strength of the connection is higher. If the wound pole piece and the isolation The width of the membrane is wide, and a connected structure can be adopted.
  • the hollow sleeve 4 is provided with several second ventilation holes 404 .
  • first connecting piece 1, the second connecting piece 2 and the hollow sleeve 4 are in a relatively close connection relationship, by setting the air holes, it is convenient for the first connecting piece 1 and the second connecting piece 2 to be inserted into the hollow sleeve 4, while avoiding Cause the pressure in the hollow casing 4 to be too large and deformed.
  • the material of the hollow sleeve 4 is plastic, and it will not affect the electrical performance of the battery if it remains in the battery.
  • the surfaces of the first connecting part 1 and the second connecting part 2 are provided with a coating that reduces the friction force generated when they are pulled out from the battery core.
  • the first connecting piece 1 and the second connecting piece 2 are easily pulled away from the battery core when the needle is withdrawn after winding, without causing the pole piece and separator of the core to shift. Avoid core pulling and ensure the quality of the battery.
  • the other end of the first connector 1 along its length direction is provided with a radial connection hole 104, and the other end of the second connector 2 along its length direction is also provided with a radial connection hole.
  • the hole 204, the first connecting piece 1 and the second connecting piece 2 are configured to be fixed to the winding machine through the connecting holes.
  • the winding machine is provided with positioning pins or positioning screws corresponding to the connecting holes, and the first connecting piece 1 and the second connecting piece 2 are fixed on the winding machine through the radial connecting holes, which is convenient for disassembly and assembly.
  • a winding machine comprising the winding needle described in any one of the above items.
  • the rigidity of the coiling needle is improved so that the coiling needle can withstand greater centrifugal force, and it is not easy to deflect and deform under high-speed rotation, so the acceleration, deceleration and maximum speed of the winding machine can be improved. Winding speed, improve winding efficiency and reduce production cost.
  • the winding machine includes a needle retractable mechanism
  • the first connecting member 1 and the second connecting member 2 are installed on the needle retractable mechanism so as to approach or move away from each other driven by the needle retractable mechanism.
  • the winding machine is provided with a diaphragm pressing roller and a hook knife corresponding to the winding needle, and the diaphragm pressing roller and the hook knife can approach and move away from the winding needle respectively under the drive of the driving mechanism.
  • the diaphragm pressure roller When the pole piece and the separator start to be wound, firstly, the diaphragm pressure roller is close to the winding needle, and the pole piece and the separator are pressed against the needle; secondly, the hook knife hooks the ends of the pole piece and the separator so that it The end is wound on the needle; then, the needle is wound at a small angle, and the end is pressed by the pole piece and the separator itself; finally, the hook knife and the diaphragm pressure roller are kept away from the needle in turn, and the needle rotates normally , Winding the pole piece and separator into a cell.
  • a battery winding method including:
  • Winding the pole piece and the isolation film with a rolling needle wherein the rolling needle is the rolling needle described in any one of the above.

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Abstract

本申请公开了一种卷针、卷绕机、电芯卷绕方法。该卷针包括：第一连接件；和，第二连接件，用于与第一连接件组合，第二连接件与第一连接件同轴设置，并且第一连接件和第二连接件组合后的长度大于第一连接件或第二连接件的长度。通过改变卷针的结构，提高了卷针的刚度，改善了卷绕作业的效率和质量。

Description

一种卷针、卷绕机、电芯卷绕方法
交叉引用
本申请引用于2022年1月14日递交的名称为“一种卷针、卷绕机、电芯卷绕方法”的第202210044920.8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，尤其涉及一种卷针、卷绕机、电芯卷绕方法。
背景技术
锂离子电池具有体积小、能量密度高、功率密度高、循环使用次数多和存储时间长等优点，在一些电子设备、电动交通工具、电动玩具和电动设备上得到了广泛应用，例如，锂离子电池目前广泛地应用于手机、笔记本电脑、电瓶车、电动汽车、电动飞机、电动轮船、电动玩具汽车、电动玩具轮船、电动玩具飞机和电动工具，等等。
随着锂离子电池的广泛应用，人们越来越关注锂离子电池的发电原件—电芯的制备方法，而电芯最常见的制备方法是将正极极片、负极极片和隔膜在卷针上多次卷绕而形成。然而，这种采用该方法制备的电芯的尺寸受限于卷针的尺寸，即，在制备长度较长的电芯时需要使用足够长的卷针，但当卷针长度变长，卷针的刚度往往又达不到要求，因而亟需一种新型卷针解决上述技术问题。
发明内容
本申请提出一种卷针、卷绕机、电芯卷绕方法，通过改变现有卷针的结构，提高了卷针的刚度，改善了卷绕作业的效率和质量。
根据本申请的第一方面，提供了一种卷针，包括：
第一连接件；和第二连接件，用于与第一连接件组合，第二连接件与第一连接件同轴设置，并且第一连接件和第二连接件组合后的长度大于第一连接件或第二连接件的长度。
通过将第一连接件和第二连接件同轴组合以形成长度分别大于第一连接件或第二连接件的卷针，可以在保证卷针卷绕长度的情况下，无需增加卷针的直径即可提高卷针 的整体刚度，减小了卷针在卷绕过程中的弯曲变形，满足卷绕宽幅长电芯的需求。另外，卷针直径小，可以提高由该卷针卷绕的电芯能量密度，从而提升卷绕作业的效率和质量。
在一些实施例中，第一连接件包括沿其自身长度方向的两端；第二连接件也包括沿其自身长度方向的两端；第一连接件沿其长度方向的一端与第二连接件沿其长度方向的一端组合。
通过将第一连接件和第二连接件的端部组合，方便将第一连接件和第二连接件同轴设置，也方便根据卷针的长度限定第一连接件和第二连接件的长度。
在一些实施例中，第一连接件沿其长度方向的一端与第二连接件沿其长度方向的一端通过插接的方式连接。
通过将第一连接件和第二连接件的端部插接，第一连接件和第二连接件能够互相支撑，二者构成一个整体，从而提高卷针的整体刚度。
在一些实施例中，第一连接件沿其长度方向的一端与第二连接件沿其长度方向的一端通过间隔设置的方式组合。
通过将第一连接件和第二连接件的端部间隔设置，可以在保证卷针整体长度的基础上进一步缩短第一连接件和第二连接件长度，从而提高卷针的整体刚度。另外，当第一连接件和第二连接件长度缩短，在满足卷针整体刚度的情况下，还可以进一步减小第一连接件和第二连接件的直径，从而提高由该卷针卷绕的电芯的能量密度。
在一些实施例中，卷针还包括中间连接件，第一连接件沿其长度方向的一端与第二连接件沿其长度方向的一端通过中间连接件组合。
通过采用中间连接件将第一连接件和第二连接件的端部连接，第一连接件、中间连接件和第二连接件三者构成一个整体，能够互相支撑，从而提高卷针的整体刚度。卷绕结束退针时中间连接件保留在电芯内部，还可以对电芯的内圈起到支撑作用，保持电芯的结构。
在一些实施例中，中间连接件包括连接杆，连接杆的两端分别与第一连接件沿其长度方向的一端与第二连接件沿其长度方向的一端插接。
通过采用连接杆连接第一连接件和第二连接件的端部，第一连接件、连接杆和第二连接件三者构成一个整体，能够互相支撑，可以显著提高卷针的整体刚度。
在一些实施例中，连接杆为实心杆或空心杆。
将连接杆设置为实心或者空心，均可以连接第一连接件和第二连接件，实心的连接杆结构强度更高，如果卷绕的极片和隔离膜的幅度较宽，可以采用实心的连接杆。
在一些实施例中，中间连接件包括中空套管，第一连接件与第二连接件分别从中空套管的两端插入中空套管。
通过采用中空套管连接第一连接件和第二连接件，第一连接件、中空套管和第二连接件三者构成一个整体，能够互相支撑，可以显著提高卷针的整体刚度。
在一些实施例中，第一连接件与第二连接件在中空套管内相连接，或者间隔设置。
将第一连接件与第二连接件在中空套管内相连接或者间隔设置，均可以与中空套管套接，相连接的结构强度更高，如果卷绕的极片和隔离膜的幅度较宽，可以采用相连接的结构。
在一些实施例中，中空套管上设置有若干透气孔。
因为第一连接件、第二连接件与中空套管是比较紧密的连接关系，通过设置透气孔，方便第一连接件和第二连接件插入中空套管内，同时避免造成中空套管内压力过大而变形。
在一些实施例中，第一连接件和第二连接件的表面设置有减小从电芯内抽离时所产生摩擦力的涂层。
通过设置能够减小摩擦力的涂层，卷绕结束退针时第一连接件和第二连接件容易从电芯内抽离，不会造成芯部的极片和隔离膜移位，避免造成抽芯，保证了电芯的质量。
在一些实施例中，第一连接件沿其长度方向的另一端设置有径向连接孔，第二连接件沿其长度方向的另一端也设置有径向连接孔，第一连接件和第二连接件被配置为通过连接孔固定于卷绕机。
卷绕机对应连接孔设置有定位销或定位螺钉，通过径向连接孔将第一连接件和第二连接件固定在卷绕机上，拆装方便。
根据本申请的第二方面，提供了一种卷绕机，包括以上任一项所述的卷针。
通过采用以上任一项所述的卷针，卷针刚度提高使得卷针可以承受更大的离心力，在高速旋转状态下也不容易发生挠度变形，所以可以提升卷绕机加速度、减速度和最大卷绕速度，提高卷绕效率，降低生产成本。
在一些实施例中，卷绕机包括卷针伸缩机构，第一连接件和第二连接件安装在卷针伸缩机构上，以在卷针伸缩机构的带动下相互靠近或远离。
根据本申请的第三方面，提供了一种电芯卷绕方法，包括：
提供极片和隔离膜；
使用卷针卷绕极片和隔离膜，其中，卷针为以上任一项所述的卷针。
附图说明
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1示出了根据本申请的一些实施例的卷针的主视示意图；
图2示出了图1中的沿A-A的剖视图；
图3示出了根据本申请的一些实施例的卷针的分解示意图；
图4示出了根据本申请的一些实施例的卷针的使用状态示意图；
图5示出了根据本申请的一些实施例的卷针的主视示意图；
图6示出了图5中的沿B-B的剖视图；
图7示出了根据本申请的一些实施例的卷针的主视示意图；
图8示出了图7中的沿C-C的剖视图；
图9示出了根据本申请的一些实施例的卷针的分解示意图；
图10示出了根据本申请的一些实施例的连接杆的主视示意图；
图11示出了根据本申请的一些实施例的卷针的使用状态示意图；
图12示出了根据本申请的一些实施例的卷针的主视示意图；
图13示出了图12中的沿D-D的剖视图；
图14示出了根据本申请的一些实施例的卷针的分解示意图；
图15示出了根据本申请的一些实施例的中空套管的主视示意图；
图16示出了根据本申请的一些实施例的卷针的使用状态示意图；
图17示出了根据本申请的一些实施例的卷针的剖视示意图；
图18示出了根据本申请的一些实施例的卷针的分解示意图；
附图标记说明：
1、第一连接件；101、第一固定端；102、第一主体部；103、第一组合端；104、第一连接孔；2、第二连接件；201、第二固定端；202、第二主体部；203、第二组合端；204、第二连接孔；3、连接杆；301、第三组合端；302、第三主体部；303、第四组合端；304、第一透气孔；4、中空套管；401、第五组合端；402、第四主体部；403、第六组合端；404、第二透气孔；5、膜片。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合显示出根据本申请的多个实施例的附图，对本申请实施例中的技术方案进行清楚、完整地描述，应当可以理解的是，所描述的实施例仅是本申请的一部分实施例，而不是全部的实施例。基于本申请中记载的实施例，本领域普通技术人员在不用花费创造性劳动的前提下所获得的所有其他实施例，都将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”、“包含”、“有”、“具有”、“含有”、“含”等为开放式的用词。因此，“包括”、“包含”、“有”例如一个或多个步骤或元件的一种方法或装置，其具有一个或多个步骤或元件，但不限于仅具有这一个或多个元件。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。此外，术语“第一”、“第二”仅用于描述目的，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。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。
在本申请的描述中，需要理解的是，术语“中心”、“横向”、“长度”、“宽度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“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的限制。
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。
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。
如上所述，应当强调，当在本说明书中使用术语“包括/包含”时，用于明确表明表示所述特征、整数、步骤或组件的存在，但不排除存在或添加一个或更多个其他特征、整数、步骤、部件或成组的特征、整数、步骤、部件。如本申请所用，单数形式“一个”、“一”和“该”也包括复数形式，除非上下文另有明确指示。
本说明书中的用词“一”、“一个”可以表示一个，但也可与“至少一个”或“一个或多个”的含义一致。术语“约”一般表示提及的数值加上或减去10％，或更具体地是加上或减去5％。在权利要求书中使用的术语“或”，除非明确表示其仅指可替代的方案，否则其表示“和/或”的意思。
本申请中术语“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，本申请中字符“/”，一般表示前后关联对象是一种“或”的关系。
锂离子电池(指：电池单体)主要依靠锂离子在正极极片和负极极片之间移动来工作。锂离子电池使用一个嵌入的锂化合物作为一个电极材料。目前用作锂离子电池的正极材料主要常见的有：锂钴氧化物(LiCoO2)、锰酸锂(LiMn2O4)、镍酸锂(LiNiO2)及磷酸锂铁(LiFePO4)。正极极片和负极极片之间设置有隔离膜以形成具有三层材料的薄膜结构。该薄膜结构一般通过卷绕或者叠置的方式制成所需形状的电芯。例如，柱形电池中的三层材料的薄膜结构被卷绕成柱形形状的电芯，而方形电池中的薄膜结构被卷绕或者叠置成具有大致长方体形状的电芯。
申请人发现，采用卷绕方式制备的锂离子电池的尺寸受限于卷针的尺寸，即，在制备长度较长的锂离子电池时需要使用足够长的卷针，但仅当卷针长度变长，卷针的刚度往往又达不到要求。为了将长卷针的刚度提高，申请人增加了卷针的直径，但是当增加卷针直径后，申请人发现由于卷针会过多占用电池的体积，进而使得电池的能量密度降低。
申请人经过长期研究，设计出一种新型卷针，该卷针包括第一连接件和第二连接件，第二连接件用于与第一连接件组合，第二连接件与第一连接件同轴设置，并且第一连接件和第二连接件组合后的长度大于第一连接件或第二连接件的长度。该新型卷针在延长卷针长度的同时提高了卷针的刚度，改善了卷绕作业的效率和质量，另外，使用该卷针卷绕的电芯的能量密度能够得到提升。
为了更好地理解本申请，下面结合图1至图18对本申请的实施例进行详细描述。
如图1、图2、图3所示，为本申请一实施例的一种卷针，包括第一连接件1和第二连接件2，第二连接件2用于与第一连接件1组合，第二连接件2与第一连接件1同轴设置，并且第一连接件1和第二连接件2组合后的长度大于第一连接件1或第二连接件2的长度。
通过将第一连接件1和第二连接件2同轴组合以形成长度分别大于第一连接件1或第二连接件2的卷针，可以在保证卷针卷绕长度的情况下，无需增加卷针的直径即可提高卷针的整体刚度，减小了卷针在卷绕过程中的弯曲变形，满足卷绕宽幅长电芯的需求。另外，卷针直径小，可以提高由该卷针卷绕的电芯能量密度，从而提升卷绕作业的效率和质量。
在一些实施例中，如图1、图2所示，第一连接件1包括沿其自身长度方向的两端；第二连接件2也包括沿其自身长度方向的两端；第一连接件1沿其长度方向的一端与第二连接件2沿其长度方向的一端组合。
通过将第一连接件1和第二连接件2的端部组合，方便将第一连接件1和第二连接件2同轴设置，也方便限定第一连接件1和第二连接件2的长度与卷针的整体长度的比例。
如图3、图4所示，第一连接件1包括第一组合端103、第一主体部102、第一固定端101，第二连接件2包括第二组合端203、第二主体部202、第二固定端201。第一连接件1卷绕电芯的部分为第一主体部102，第二连接件2卷绕电芯的部分为第二主体部202，第一主体部102、第二主体部202的横截面为：圆形、椭圆形、边数大于三的多边形、端角圆滑过渡的多边形、或扁平形。
第一连接件1、第二连接件2的材质不限于常用的碳钢、碳素结构钢、优质结构钢、碳素工具钢、易切削结构钢、合金钢、普通低合金钢、工程结构用合金钢、机械结构用合金钢、合金结构钢、合金工具钢、高速工具钢等。
在一些实施例中，如图1、图2所示，第一连接件1沿其长度方向的一端与第二连接件2沿其长度方向的一端通过插接的方式连接。该实施例的卷针卷绕极片和隔离膜的状态如图4所示，图4中的膜片5包括正极极片、负极极片和隔离膜。
通过将第一连接件1和第二连接件2的端部插接，第一连接件1和第二连接件2能够互相支撑，二者构成一个整体，从而提高卷针的整体刚度。
第一连接件1的第一组合端103设置有圆锥形、圆柱形或多边形插槽，第二连接件2的第二组合端203对应设置有圆锥形、圆柱形或多边形插头。通过该插接结构设置，方便第一连接件1和第二连接件2实现同轴。
在一些实施例中，如图5、图6所示，第一连接件1沿其长度方向的一端与第二连接件2沿其长度方向的一端通过间隔设置的方式组合。
通过将第一连接件1和第二连接件2的端部间隔设置，可以进一步缩短第一连接件1和第二连接件2长度，从而提高卷针的整体刚度。还可以进一步减小第一连接件1和第二连接件2的直径，从而提高电芯能量密度。
在一些实施例中，卷针还包括中间连接件，第一连接件1沿其长度方向的一端与第二连接件2沿其长度方向的一端通过中间连接件组合。
通过采用中间连接件将第一连接件1和第二连接件2的端部连接，第一连接件1、中间连接件和第二连接件2三者构成一个整体，能够互相支撑，从而提高卷针的整体刚度。
卷绕结束退针时中间连接件保留在电芯内部，还可以对电芯的内圈起到支撑作用，保持电芯的结构。中间连接件的材质为塑料，保留在电芯内不会影响电芯的电学性能。
在一些实施例中，如图7、图8、图9、图10所示，中间连接件包括连接杆3，连接杆3的两端分别与第一连接件1沿其长度方向的一端与第二连接件2沿其长度方向的一端插接。该实施例的卷针卷绕极片和隔离膜的状态如图11所示，图11中的膜片5包括正极极片、负极极片和隔离膜。
通过采用连接杆3连接第一连接件1和第二连接件2的端部，第一连接件1、连接杆3和第二连接件2三者构成一个整体，能够互相支撑，可以显著提高卷针的整体刚度。
如图9、图10所示，连接杆3包括第三组合端301、第三主体部302、第四组合端303。第三组合端301与第一连接件1的第一组合端103插接，第四组合端303与第二连接件2的第二组合端203插接。此时，卷绕电芯的部分主要为第二主体部202、第三主体部302、第一主体部102。
可以在连接杆3的外壁设置有增大摩擦力的涂层，通过设置能够增大摩擦力的涂层，可以增大连接杆3与膜片5之间的摩擦力，既方便卷绕，又能够将连接杆3稳定保持在电芯的内部。
为了方便插接，第一组合端103、第二组合端203分别设置有"凸"字形连接结构，相应地，连接杆3的两端分别设置有"凹"字形连接结构。通过该插接结构设置，方便第一连接件1、连接杆3和第二连接件2实现同轴。
连接杆3的材质为塑料，保留在电芯内不会影响电芯的电学性能。
在一些实施例中，连接杆3为实心杆或空心杆。图9所示的连接杆3为空心杆。
将连接杆3设置为实心或者空心，均可以连接第一连接件1和第二连接件2，实心的连接杆3结构强度更高，如果卷绕的极片和隔离膜的幅度较宽，可以采用实心的连接杆3。
在一些实施例中，空心的连接杆3上设置有若干第一透气孔304。
因为第一连接件1、第二连接件2与连接杆3是比较紧密的连接关系，通过设置透气孔，方便第一连接件1和第二连接件2与连接杆3插接，同时避免造成连接杆3内压力过大而变形。
在一些实施例中，如图12、图13、图14、图15所示，中间连接件包括中空套管4，第一连接件1与第二连接件2分别从中空套管4的两端插入中空套管4。该实施例的卷针卷绕极片和隔离膜的状态如图16所示，图16中的膜片5包括正极极片、负极极片和隔离膜。
通过采用中空套管4连接第一连接件1和第二连接件2，第一连接件1、中空套管4和第二连接件2三者构成一个整体，能够互相支撑，可以显著提高卷针的整体刚度。
如图14、图15所示，中空套管4包括第五组合端401、第四主体部402、第六组合端403。此时，卷绕电芯的部分主要为第四主体部402。
可以在中空套管4的内壁设置有减小第一连接件1、第二连接件2抽离时所产生摩擦力的涂层。通过设置能够减小摩擦力的涂层，卷绕结束退针时第一连接件1和第二连接件2容易从中空套管4内抽离，不会造成中空套管4移位，也就不会造成芯部的极片和隔离膜移位，避免造成抽芯，保证了电芯的质量。
还可以在中空套管4的外壁设置有增大摩擦力的涂层，通过设置能够增大摩擦力的涂层，可以增大中空套管4与膜片5之间的摩擦力，既方便卷绕，又能够将中空套管4稳定保持在电芯的内部。
在一些实施例中，第一连接件1与第二连接件2在中空套管4内相连接，或者间隔设置。如图12、图13、图14所示第一连接件1与第二连接件2在中空套管4内相连接，如图17、图18所示第一连接件1与第二连接件2在中空套管4内间隔设置。
将第一连接件1与第二连接件2在中空套管4内相连接或者间隔设置，均可以与中空套管4套接，相连接的结构强度更高，如果卷绕的极片和隔离膜的幅度较宽，可以采用相连接的结构。
在一些实施例中，中空套管4上设置有若干第二透气孔404。
因为第一连接件1、第二连接件2与中空套管4是比较紧密的连接关系，通过设置透气孔，方便第一连接件1和第二连接件2插入中空套管4内，同时避免造成中空套管4内压力过大而变形。
中空套管4的材质为塑料，保留在电芯内不会影响电芯的电学性能。
在一些实施例中，第一连接件1和第二连接件2的表面设置有减小从电芯内抽离时所产生摩擦力的涂层。
通过设置能够减小摩擦力的涂层，卷绕结束退针时第一连接件1和第二连接件2容易从电芯内抽离，不会造成芯部的极片和隔离膜移位，避免造成抽芯，保证了电芯的质量。
在一些实施例中，如图3所示，第一连接件1沿其长度方向的另一端设置有径向连接孔104，第二连接件2沿其长度方向的另一端也设置有径向连接孔204，第一连接件1和第二连接件2被配置为通过连接孔固定于卷绕机。
卷绕机对应连接孔设置有定位销或定位螺钉，通过径向连接孔将第一连接件1和第二连接件2固定在卷绕机上，拆装方便。
根据本申请的第二方面，提供了一种卷绕机，包括以上任一项所述的卷针。
通过采用以上任一项所述的卷针，卷针刚度提高使得卷针可以承受更大的离心力，在高速旋转状态下也不容易发生挠度变形，所以可以提升卷绕机加速度、减速度和最大卷绕速度，提高卷绕效率，降低生产成本。
在一些实施例中，卷绕机包括卷针伸缩机构，第一连接件1和第二连接件2安装在卷针伸缩机构上，以在卷针伸缩机构的带动下相互靠近或远离。
在一些实施例中，卷绕机上对应卷针设置有隔膜压辊和勾刀，隔膜压辊、勾刀在驱动机构的驱动下可以分别靠近和远离卷针。在极片和隔离膜开始卷绕时，首先，隔膜压辊靠近卷针，将极片和隔离膜压靠在卷针上；其次，勾刀勾住极片和隔离膜的端部，使得其端部卷绕在卷针上；然后，卷针卷绕较小的角度，利用极片和隔离膜自身压住其端部；最后，勾刀、隔膜压辊依次远离卷针，卷针正常旋转，将极片和隔离膜卷绕成电芯。
根据本申请的第三方面，提供了一种电芯卷绕方法，包括：
提供极片和隔离膜；
使用卷针卷绕极片和隔离膜，其中，卷针为以上任一项所述的卷针。
最后应说明的是：以上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，或者对其中部分技术特征进行等同替换，但这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例的技术方案的精神和范围。

Claims (15)

  1. 一种卷针，用于卷绕电芯，包括：
    第一连接件；和，
    第二连接件，用于与所述第一连接件组合，所述第二连接件与所述第一连接件同轴设置，并且所述第一连接件和所述第二连接件组合后的长度大于所述第一连接件或所述第二连接件的长度。
  2. 根据权利要求1所述的卷针，所述第一连接件包括沿其自身长度方向的两端；所述第二连接件也包括沿其自身长度方向的两端；所述第一连接件沿其长度方向的一端与所述第二连接件沿其长度方向的一端组合。
  3. 根据权利要求2所述的卷针，所述第一连接件沿其长度方向的一端与所述第二连接件沿其长度方向的一端通过插接的方式连接。
  4. 根据权利要求2所述的卷针，所述第一连接件沿其长度方向的一端与所述第二连接件沿其长度方向的一端通过间隔设置的方式组合。
  5. 根据权利要求2所述的卷针，所述卷针还包括中间连接件，所述第一连接件沿其长度方向的一端与所述第二连接件沿其长度方向的一端通过所述中间连接件组合。
  6. 根据权利要求5所述的卷针，所述中间连接件包括连接杆，所述连接杆的两端分别与所述第一连接件沿其长度方向的一端与所述第二连接件沿其长度方向的一端插接。
  7. 根据权利要求6所述的卷针，所述连接杆为实心杆或空心杆。
  8. 根据权利要求5所述的卷针，所述中间连接件包括中空套管，所述第一连接件与所述第二连接件分别从所述中空套管的两端插入所述中空套管。
  9. 根据权利要求8所述的卷针，所述第一连接件与所述第二连接件在所述中空套管内相连接，或者间隔设置。
  10. 根据权利要求8或9所述的卷针，所述中空套管上设置有若干透气孔。
  11. 根据权利要求1至10中任一项所述的卷针，所述第一连接件和所述第二连接件的表面设置有减小从电芯内抽离时所产生摩擦力的涂层。
  12. 根据权利要求2至10中任一项所述的卷针，所述第一连接件沿其长度方向的另一端设置有径向连接孔，所述第二连接件沿其长度方向的另一端也设置有径向连接孔，所述第一连接件和所述第二连接件被配置为通过所述连接孔固定于卷绕机。
  13. 一种卷绕机，包括权利要求1-12任一项所述的卷针。
  14. 根据权利要求13所述的卷绕机，所述卷绕机包括卷针伸缩机构，所述第一连接件和所述第二连接件安装在所述卷针伸缩机构上，以在所述卷针伸缩机构的带动下相互靠近或远离。
  15. 一种电芯卷绕方法，包括：
    提供极片和隔离膜；
    使用卷针卷绕所述极片和所述隔离膜，其中，所述卷针为所述权利要求1-12任一项所述的卷针。
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CN112928339A (zh) * 2021-03-09 2021-06-08 东莞泓宇智能装备有限公司 一种锂电池制片卷绕机的超小距离卷针结构
CN215578687U (zh) * 2021-07-20 2022-01-18 河北银隆新能源有限公司 电芯卷绕装置
CN218241930U (zh) * 2022-06-16 2023-01-06 广东利元亨智能装备股份有限公司 一种卷针机构及卷绕机

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