WO2025007599A1 - 卷针、卷绕装置、电池制造设备及卷绕方法 - Google Patents

卷针、卷绕装置、电池制造设备及卷绕方法 Download PDF

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Publication number
WO2025007599A1
WO2025007599A1 PCT/CN2024/084027 CN2024084027W WO2025007599A1 WO 2025007599 A1 WO2025007599 A1 WO 2025007599A1 CN 2024084027 W CN2024084027 W CN 2024084027W WO 2025007599 A1 WO2025007599 A1 WO 2025007599A1
Authority
WO
WIPO (PCT)
Prior art keywords
winding
needle
clamping
electrode assembly
winding needle
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2024/084027
Other languages
English (en)
French (fr)
Inventor
艾玉泉
魏川域
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
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.)
Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to EP24835086.0A priority Critical patent/EP4734216A1/en
Publication of WO2025007599A1 publication Critical patent/WO2025007599A1/zh
Priority to US19/438,960 priority patent/US20260125234A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/08—Web-winding mechanisms
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/022—Registering, tensioning, smoothing or guiding webs transversely by tentering devices
    • B65H23/028—Registering, tensioning, smoothing or guiding webs transversely by tentering devices by clips
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/72—Fuel cell manufacture
    • 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 production, and in particular to a winding needle, a winding device, a battery manufacturing equipment and a winding method.
  • the present application provides a winding needle, a winding device, a battery manufacturing equipment and a winding method, which can improve the reliability of the battery.
  • the present application provides a winding needle, including a winding needle body, a pair of first grooves are arranged on the outer circumferential surface of the winding needle body, the first groove is used to accommodate the first clamping needle, and the pair of first grooves are arranged at intervals along the circumference of the winding needle body; wherein, at least one second groove is also arranged on the outer circumferential surface of the winding needle body, the second groove is used to accommodate the second clamping needle, and the second groove and the first groove are arranged at intervals along the circumference of the winding needle body.
  • the technical solution of the embodiment of the present application is to provide a pair of circumferentially spaced first grooves and a second groove different from the first groove on the outer circumferential surface of the winding needle body.
  • the pair of first grooves are arranged on both sides in the vertical direction, and the second groove is arranged above the line connecting the pair of first grooves.
  • the electrode assembly is formed by winding the outer circumferential surface of the winding needle body, and the first clamping needle is accommodated by the first groove, and the second clamping needle is accommodated by the second groove, thereby determining the positions of the first clamping needle and the second clamping needle.
  • the second clamping needle whose position is determined by the second groove abuts against the upper half of the electrode assembly, thereby reducing the descending speed of the upper half, reducing the risk of the upper half collapsing due to the rapid descent of the upper half due to gravity, thereby causing wrinkling, and also reducing the probability of the pole ear folding when the pole ear is located in the upper half, thereby reducing the risk of lithium plating in the electrode assembly, improving the reliability of the battery cell, and thus improving the reliability of the battery.
  • a pair of first grooves are arranged 180° apart along the circumference of the winding needle body.
  • the technical solution of the embodiment of the present application is to set a pair of first grooves at an interval of 180° on the outer circumferential surface of the winding needle body, wherein the electrode assembly is formed by winding the outer circumferential surface of the winding needle body, and the pair of first grooves are set on both sides in the vertical direction, that is, the pair of first grooves are located on the diameter of the electrode assembly in the horizontal direction, and the first groove is used to accommodate the first clamping needle.
  • the first clamping needles are separated from each other in the horizontal direction, which can achieve the best stretching effect of the electrode assembly and facilitate the setting of the second groove, thereby improving convenience.
  • the angle between the second groove and one of the first grooves is ⁇ , satisfying: 45° ⁇ 90°.
  • the angle between the second groove and one of the first grooves is ⁇ , and when in use, a pair of first grooves are arranged horizontally, and the second groove is arranged above the first groove, and the first groove is used to accommodate the first clamping needle, and the second groove is used to accommodate the second clamping needle.
  • the size of ⁇ corresponds to the position of the second clamping needle corresponding to the wound electrode assembly.
  • the first clamping needle and the second clamping needle are farther apart, that is, the second clamping needle has a higher height in the vertical direction, and the part of the upper half abutted by the second clamping needle is closer to the upper end of the electrode assembly, and the angle deviating from the upper end of the electrode assembly is smaller.
  • the second clamping needle abuts against the upper half of the electrode assembly, which reduces the descending speed of the upper half of the electrode assembly, reduces the risk of the upper half collapsing due to the action of gravity and causing wrinkling, and also reduces the probability of the pole ear folding when the pole ear is located in the upper half, thereby reducing the risk of lithium plating in the electrode assembly, improving the reliability of the battery cell, and thus improving the reliability of the battery.
  • the second clamping needle when 60° ⁇ 90°, that is, the first clamping needle and the second clamping needle are farther apart, the second clamping needle is closer to the upper end of the electrode assembly, and the angle of deviation from the upper end of the electrode assembly is smaller, and the second clamping needle abuts against the upper half of the electrode assembly, thereby reducing the descending speed of the upper half of the electrode assembly, reducing the risk of the upper half collapsing due to rapid descent of the upper half due to gravity, thereby causing wrinkling, and also reducing the probability of the pole ear folding when it is located in the upper half, thereby reducing the risk of lithium plating in the electrode assembly, improving the reliability of the battery cell, and thus improving the reliability of the battery.
  • the second clamping needle when 85° ⁇ 90°, that is, the second clamping needle abuts against the uppermost end of the electrode assembly, and deviates from the uppermost end of the electrode assembly due to positioning error or process reasons, the second clamping needle abuts against the upper half of the electrode assembly, which reduces the descending speed of the upper half of the electrode assembly, reduces the risk of the upper half collapsing due to rapid descent of the upper half due to gravity, and causes wrinkling, and also reduces the probability of the pole ear folding when it is located in the upper half, thereby reducing the risk of lithium plating of the electrode assembly, improving the reliability of the battery cell, and thus improving the reliability of the battery.
  • the outer circumferential surface of the winding needle body is divided into a first area and a second area by a pair of first grooves, and there are multiple second grooves, and the multiple second grooves are all arranged in the first area.
  • the technical solution of the embodiment of the present application is that under the action of gravity, only the upper half of the electrode assembly will collapse due to the rapid descent, thereby causing the pole piece or pole ear of the upper half to wrinkle, that is, only the upper half of the electrode assembly needs to be abutted for support.
  • the outer peripheral surface of the winding needle body is divided into a first area and a second area by a pair of first grooves, and a plurality of second grooves are all arranged in the first area.
  • the pair of first grooves are arranged in the horizontal direction, and the second grooves in the first area are arranged above the pair of first grooves.
  • the second groove is used to accommodate the second clamping needle.
  • the second clamping needle abuts the upper half of the electrode assembly, thereby reducing the descending speed of the upper half of the electrode assembly, reducing the risk of the upper half collapsing due to the rapid descent of the upper half due to the action of gravity, thereby causing wrinkles, and also reducing the probability of the pole ear folding when the pole ear is located in the upper half, thereby reducing the risk of lithium deposition in the electrode assembly, improving the reliability of the battery cell, and thus improving the reliability of the battery.
  • a pair of first grooves are symmetrically arranged relative to the first plane, the central axis of the winding needle body is located on the first plane, and there are multiple second grooves, which are symmetrically arranged relative to the first plane.
  • the technical solution of the embodiment of the present application is to arrange multiple second grooves symmetrically relative to the first plane, and the central axis of the winding needle body is located on the first plane, that is, when in use, a pair of first grooves are arranged in the horizontal direction, and the electrode assembly is formed by winding the outer peripheral surface of the winding needle body, and the second grooves are symmetrically arranged relative to the diameter of the electrode assembly in the vertical direction, and the second clamping needles are accommodated in the second grooves, so that the multiple second clamping needles respectively abut the parts of the electrode assembly on both sides of the diameter in the vertical direction, so that the abutting effect of the second clamping needles located on both sides of the diameter of the electrode assembly in the vertical direction is symmetrical, thereby reducing the descending speed of the upper half of the electrode assembly, reducing the risk of the upper half collapsing due to the rapid descent of the upper half due to gravity, thereby causing wrinkling, and also reducing the probability of the pole
  • both the first groove and the second groove penetrate the winding needle body along the axial direction of the winding needle body.
  • the first groove and the second groove extend along the axial direction of the winding needle body and penetrate the winding needle body, the first groove is used to accommodate the first clamping needle, and the second groove is used to accommodate the second clamping needle, which improves the convenience of the first clamping needle and the second clamping needle during the installation process.
  • the positions of the first groove and the second groove are determined, which improves the accuracy of the installation positions of the first clamping needle and the second clamping needle, and also facilitates the removal of the winding needle, reducing the risk of interference between the winding needle and the first clamping needle and the second clamping needle during the removal process.
  • the needle winding body includes a first needle winding portion and a second needle winding portion, a gap is defined between the first needle winding portion and the second needle winding portion, the second groove and one of the first grooves are arranged on the outer peripheral surface of the first needle winding portion, and the other first groove is arranged on the outer peripheral surface of the second needle winding portion.
  • a winding needle body is composed of a first winding needle part and a second winding needle part, and the first winding needle part and the second winding needle part define a gap, wherein one first groove is arranged on the first winding needle part, and the other first groove is arranged on the second winding needle part.
  • the size of the gap can be changed by moving the first winding needle part and the second winding needle part, thereby changing the relative position of the first winding needle part and the second winding needle part, thereby realizing fine adjustment of a pair of first grooves during setting, and accommodating the first clamping needle by the first groove, thereby improving the accuracy of the installation position of the first clamping needle, thereby improving the stretching effect of the electrode assembly, improving the reliability of the electrode assembly, and improving the reliability of the battery cell and the battery.
  • the present application also provides a winding device for winding an electrode assembly, comprising a winding needle as in any embodiment of the first aspect, a pair of first clamping needles and at least one second clamping needle, wherein the pair of first clamping needles are configured to move away from each other after the winding needle is pulled out of the electrode assembly to stretch the electrode assembly, and the second clamping needles are configured to support the upper half of the electrode assembly during the process of the pair of first clamping needles stretching the electrode assembly.
  • the technical solution of the embodiment of the present application is to set the first clamping needle in the first groove and the second clamping needle in the second groove. After the electrode assembly is wound into shape by the winding needle, the two first clamping needles move away from each other in the horizontal direction and abut against the two inner walls of the electrode assembly opposite to each other in the horizontal direction to stretch the electrode assembly in the horizontal direction.
  • the two inner walls of the electrode assembly opposite to each other in the vertical direction are close to each other, and the second clamping needle abuts against the upper half of the electrode assembly to reduce the descending speed of the upper half, thereby reducing the risk of the upper half collapsing due to the upper half descending too fast due to gravity, thereby causing wrinkling, and also reduces the probability of the pole ear folding when it is located in the upper half, thereby reducing the risk of lithium plating in the electrode assembly, improving the reliability of the battery cell, and thus improving the reliability of the battery.
  • the second clamping needle has a first wall surface away from the central axis of the winding needle body, and the first wall surface is configured as an arc surface.
  • the second clamping needle abuts the upper half of the electrode assembly
  • the second clamping needle has a first wall surface away from the central axis of the winding needle body, and the first wall surface abutting the upper half of the electrode assembly is an arc surface. Since the electrode assembly after winding is annular, the inner wall of the electrode assembly is an arc surface. Therefore, the first wall surface is constructed as an arc surface, which can make the second clamping needle abut the upper half of the electrode assembly more smooth, reduce the risk of damaging the electrode assembly, and thus improve the reliability of the battery.
  • the winding device further comprises a heating element connected to the second clamping needle to heat the second clamping needle.
  • the technical solution of the embodiment of the present application is to set a heating element connected to the second clamping needle for heating the second clamping needle, wherein the second clamping needle is used to abut the upper half of the electrode assembly, the upper half includes a positive electrode sheet, a negative electrode sheet and a diaphragm for bonding the positive and negative electrode sheets, and the heating of the second clamping needle causes the adhesive of the diaphragm in the upper half to melt, thereby making the bonding with the diaphragm and the positive and negative electrode sheets stronger, reducing the risk of wrinkling the electrode sheets, and improving the reliability of the electrode assembly, thereby improving the reliability of the battery.
  • the heating element is a resistive element.
  • the technical solution of the embodiment of the present application sets the heating element as a resistance element, which is easy to obtain and easy to achieve the heating effect, thereby improving the convenience of heating.
  • the winding device also includes a first driving member and a second driving member, the first driving member is connected to a pair of first clamping needles to drive the pair of first clamping needles away from each other along a first direction, and the second driving member is connected to the second clamping needle to drive the second clamping needle to move along a second direction, wherein the first direction and the second direction intersect.
  • the technical solution of the embodiment of the present application is to drive a pair of first clamping needles away from each other in the first direction by setting a first driving member connected to the first clamping needle, and to drive a second clamping needle to move downward in the second direction by setting a second driving member, so that the two first clamping needles move away from each other in the first direction, and abut against two inner walls of the electrode assembly opposite to each other in the first direction, so as to stretch the electrode assembly in the first direction, so that the second clamping needle moves downward in the second direction, and abuts against the upper part of the electrode assembly during the movement, thereby reducing the descending speed of the upper part, reducing the risk of the upper part collapsing due to the upper part falling too fast due to gravity, thereby causing wrinkles, and also reducing the probability of the pole ear folding when the pole ear is located in the upper part, thereby reducing the risk of lithium deposition in the electrode assembly, improving the reliability of the battery cell, and thus improving the reliability of the battery.
  • an embodiment of the present application further provides a battery manufacturing device, comprising a winding device as in any one of the embodiments of the second aspect.
  • the technical solution of the embodiment of the present application is to complete the winding of the electrode assembly by a winding device, and then manufacture the battery or battery cell by a battery manufacturing device.
  • the winding device includes a winding needle, a first clamping needle and a second clamping needle, the first clamping needle is set in the first groove of the winding needle, and the second clamping needle is set in the second groove of the winding needle.
  • the two inner walls of the electrode assembly opposite to each other in the vertical direction are close to each other, wherein the second clamping needle abuts against the upper half of the electrode assembly, reduces the descending speed of the upper half, reduces the risk of the upper half collapsing due to the upper half falling too fast due to gravity, and thus causes wrinkling, and also reduces the probability of the pole ear folding when the pole ear is located in the upper half, thereby reducing the risk of lithium deposition in the electrode assembly, improving the reliability of the battery cell, and thus improving the reliability of the battery.
  • the present application also provides a winding method, comprising: providing a winding needle as in any one of the embodiments of the first aspect; winding the electrode sheet and the diaphragm with the winding needle to form an electrode assembly; inserting a pair of first clamping needles into a pair of first grooves, inserting a second clamping needle into the electrode assembly; Insert the winding needle into the second groove; pull the winding needle away from the electrode assembly; move a pair of first clamping needles away from each other to spread the electrode assembly; in the process of spreading the electrode assembly, support the upper half of the electrode assembly by the second clamping needle.
  • the technical solution of the embodiment of the present application is to wind the positive and negative electrode sheets and the diaphragm into an electrode assembly by the provided winding needle, then insert the first clamping needle into the first groove of the winding needle, and insert the second clamping needle into the second groove of the winding needle to form a winding device, and then pull the winding needle out of the electrode assembly, so that the first clamping needle and the second clamping needle can move.
  • a pair of first clamping needles are moved away from each other, abutting against the two inner walls opposite to the electrode assembly while propping up the electrode assembly to achieve stretching of the electrode assembly.
  • the second clamping needle supports the upper half of the electrode assembly, reduces the descending speed of the upper half, and reduces the risk of the upper half collapsing due to the rapid descent of the upper half due to gravity, thereby causing wrinkling.
  • it also reduces the probability of the pole ear folding when the pole ear is located in the upper half, thereby reducing the risk of lithium plating in the electrode assembly, improving the reliability of the battery cell, and thus improving the reliability of the battery.
  • the upper half of the electrode assembly is supported by a second clamping needle so that the movement speed of the area where the upper half contacts the second clamping needle is less than or equal to the movement speed of the area where the lower half of the electrode assembly faces the second clamping needle.
  • the technical solution of the embodiment of the present application supports the upper part of the electrode assembly by the second clamping needle, thereby reducing the descending speed of the upper part, so that the moving speed of the contact area between the upper part and the second clamping needle is less than or equal to the moving speed of the area where the lower part of the electrode assembly is directly opposite to the second clamping needle.
  • the second clamping needle reduces the risk of the upper part collapsing and wrinkling due to the upper part descending too quickly due to gravity, and also reduces the probability of the pole ear folding when it is located in the upper part, thereby reducing the risk of lithium plating of the electrode assembly, improving the reliability of the battery cell, and thus improving the reliability of the battery.
  • FIG1 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application.
  • FIG2 is a schematic diagram of the structure of a battery provided in some embodiments of the present application.
  • FIG3 is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application.
  • FIG4 is a schematic diagram of the structure of an electrode assembly provided in some embodiments of the present application.
  • FIG5 is a schematic diagram of the structure of a winding needle provided in some embodiments of the present application.
  • FIG6 is a schematic structural diagram of the winding needle in FIG5 from another perspective
  • FIG. 7 is a schematic diagram of the structure of a winding needle provided in some other embodiments of the present application.
  • FIG8 is a schematic structural diagram of the winding needle in FIG7 from another perspective
  • FIG9 is a schematic diagram of the structure of a winding needle provided in some other embodiments of the present application.
  • FIG10 is a schematic structural diagram of the winding needle in FIG9 from another perspective
  • FIG11 is a schematic structural diagram of a winding device provided in some embodiments of the present application.
  • FIG12 is a schematic structural diagram of the winding device in FIG11 from another perspective
  • FIG. 13 to 17 are schematic diagrams of the process of the winding method of the present application.
  • FIG18 is a schematic structural diagram of a first driving member and a second driving member of the winding device in FIG11;
  • FIG. 19 is a flow chart of a winding method according to some embodiments of the present application.
  • Icons 1-winding needle; 2-winding needle body; 3-first groove; 4-second groove; 5-first area; 6-second area; 7-first plane; 8-first winding needle part; 9-second winding needle part; 10-winding device; 11-first clamping needle; 12-second clamping needle; 13-first wall; 14-heating element; 15-first driving element; 16-second driving element; 100-electrode assembly; 110-positive electrode plate; 120-negative electrode plate; 130-diaphragm; 200-battery cell; 210-casing; 211-shell; 212-end cover; 220-electrode terminal; 300-battery; 310-box; 311-first sub-box; 312-second sub-box; 1000-vehicle; 1100-controller; 1200-motor; X-first direction; Y-second direction.
  • the terms “installed”, “connected”, “connected”, and “attached” should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements.
  • installed should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements.
  • a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
  • the character "/" in this application generally indicates that the associated objects before and after are in an "or" relationship.
  • multiple refers to more than two (including two).
  • multiple groups refers to more than two groups (including two groups)
  • multiple sheets refers to more than two sheets (including two sheets).
  • the battery may be a battery module.
  • the multiple battery cells are arranged and fixed to form a battery module.
  • the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.
  • the box body can be used as a part of the chassis structure of the vehicle.
  • part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.
  • the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.
  • the battery cell may be a secondary battery.
  • a secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.
  • the battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.
  • the battery cell may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, the prismatic battery cell including a square case battery cell.
  • a battery cell generally includes an electrode assembly.
  • the electrode assembly includes a positive electrode, a negative electrode, and a separator.
  • active ions such as lithium ions
  • the separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.
  • the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.
  • the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.
  • the positive electrode current collector may be a metal foil or a composite current collector.
  • the metal foil aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used.
  • the composite current collector may include a polymer material base layer and a metal layer.
  • the composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polyphenylene terephthalate) It is formed on a substrate such as butylene glycol dicarboxylate, polystyrene, polyethylene, etc.
  • a metal material aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.
  • a polymer material substrate such as polypropylene, polyethylene terephthalate, polyphenylene terephthalate
  • a substrate such as butylene glycol dicarboxylate, polystyrene, polyethylene, etc.
  • the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds.
  • the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.
  • the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.
  • the negative electrode current collector may be a metal foil or a composite current collector.
  • the metal foil aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used.
  • the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.
  • the negative electrode active material may adopt the negative electrode active material for the battery known in the art.
  • the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials and lithium titanate, etc.
  • the silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites and silicon alloys.
  • the tin-based material may be selected from at least one of elemental tin, tin oxide compounds and tin alloys.
  • the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.
  • the separator is a membrane.
  • the present application has no particular limitation on the type of the membrane, and any known porous membrane with good chemical stability and mechanical stability can be selected.
  • the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.
  • the separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions.
  • the separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.
  • the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.
  • the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.
  • the electrode assembly is usually wound by a winding needle, and a groove for accommodating the clamping needle is provided on the winding needle body of the winding needle. After winding, the two clamping needles are accommodated in the groove and the winding needle is pulled away from the electrode assembly, and the two clamping needles are moved away from each other in the horizontal direction to stretch the wound electrode assembly.
  • the electrode assembly is stretched in the horizontal direction, and correspondingly, the upper and lower parts of the electrode assembly in the vertical direction will approach each other, forming a trend that the upper electrode assembly falls and the lower electrode assembly rises.
  • the upper electrode assembly tends to fall faster, which can easily cause the upper electrode assembly to collapse directly, thereby causing the upper electrode assembly to wrinkle.
  • the tab When the tab is located in the upper part, the tab will also fold due to the collapse of the upper electrode assembly. There may be a risk of lithium deposition during the subsequent charging and discharging process, affecting the reliability of the battery cell, thereby affecting the reliability of the battery.
  • the embodiment of the present application provides a winding needle, including a winding needle body, a pair of first grooves and a second groove are arranged on the outer circumferential surface of the winding needle body, the pair of first grooves are arranged at intervals along the circumference of the winding needle body, and the second groove and the first groove are arranged at intervals along the circumference of the winding needle body.
  • the first groove is used to accommodate the first clamping needle
  • the second groove is used to accommodate the second winding needle.
  • the first groove accommodates the first clamping needle
  • the second groove accommodates the second winding needle.
  • the second clamping needle which is positioned by the second groove, abuts against the upper part of the electrode assembly, thereby reducing the descending speed of the upper part, reducing the risk of the upper part collapsing due to the upper part falling too fast due to gravity, thereby causing wrinkles, and also reducing the probability of the pole ear being folded when the pole ear is located in the upper part, thereby reducing the risk of lithium deposition in the electrode assembly and improving the electrode assembly.
  • the reliability of the battery cells is improved, thereby improving the reliability of the battery.
  • the battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical equipment such as vehicles, ships or aircraft.
  • the battery disclosed in the present application can be used to form a power supply system of the electrical equipment.
  • the embodiment of the present application provides an electric device using a battery as a power source
  • the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc.
  • the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc.
  • the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.
  • FIG. 1 is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application.
  • the vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.
  • a battery 300 is provided inside the vehicle 1000, and the battery 300 may be provided at the bottom, head or tail of the vehicle 1000.
  • the battery 300 may be used to power the vehicle 1000, for example, the battery 300 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1000.
  • the vehicle 1000 may further include a controller 1100 and a motor 1200 , wherein the controller 1100 is used to control the battery 300 to supply power to the motor 1200 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .
  • the battery 300 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.
  • FIG. 2 is an exploded view of a battery 300 provided in some embodiments of the present application.
  • the battery 300 may further include a box 310, in which the battery cell 200 is accommodated.
  • the box 310 is used to provide a storage space for the battery cell 200, and the box 310 may adopt a variety of structures.
  • the box 310 may include a first sub-box 311 and a second sub-box 312, and the first sub-box 311 and the second sub-box 312 cover each other, and the first sub-box 311 and the second sub-box 312 jointly define a storage space for accommodating the battery cell 200.
  • the second sub-box 312 may be a hollow structure with one end open, and the first sub-box 311 may be a plate-like structure, and the first sub-box 311 covers the open side of the second sub-box 312, so that the first sub-box 311 and the second sub-box 312 jointly define a storage space; the first sub-box 311 and the second sub-box 312 may also be hollow structures both with one side open, and the open side of the first sub-box 311 covers the open side of the second sub-box 312.
  • the battery 300 there may be multiple battery cells 200, and the multiple battery cells 200 may be connected in series, in parallel, or in a mixed connection.
  • a mixed connection means that the multiple battery cells 200 are both connected in series and in parallel.
  • the multiple battery cells 200 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 200 is accommodated in the box 310; of course, the battery 300 may also be a battery 300 module formed by connecting multiple battery cells 200 in series, in parallel, or in a mixed connection, and then the multiple battery 300 modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 310.
  • the battery 300 may also include other structures, for example, the battery 300 may also include a converging component for realizing electrical connection between the multiple battery cells 200.
  • the battery cell 200 may be a secondary battery 300 or a primary battery 300 ; the battery cell 200 may also be a lithium-sulfur battery 300 , a sodium-ion battery 300 or a magnesium-ion battery 300 , but is not limited thereto.
  • FIG. 3 is an exploded view of a battery cell 200 provided in some embodiments of the present application.
  • the battery cell 200 includes a housing 210, an electrode assembly 100, and an electrode terminal 220.
  • the housing 210 includes a shell 211 and an end cap 212, the shell 211 has an opening, and the end cap 212 closes the opening to isolate the internal environment of the battery cell 200 from the external environment.
  • the shell 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 200, wherein the formed internal environment can be used to accommodate the electrode assembly 100, the electrolyte and other components.
  • the shell 211 and the end cap 212 can be independent components.
  • the shell 211 can be of various shapes and sizes. Specifically, the shape of the shell 211 can be determined according to the specific shape and size of the electrode assembly 100.
  • the material of the shell 211 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.
  • the end cap 212 refers to a component that covers the opening of the shell 211 to isolate the internal environment of the battery cell 200 from the external environment.
  • the shape of the end cap 212 can be adapted to the shape of the shell 211 to match the shell 211.
  • the end cap 212 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 212 is not easily deformed when squeezed and collided, so that the battery cell 200 can have a higher structural strength and reliability can also be improved.
  • Functional components such as electrode terminals can be provided on the end cap 212. The electrode terminal can be used to electrically connect to the electrode assembly 100 for outputting or inputting electrical energy of the battery cell 200.
  • the material of the end cap 212 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.
  • an insulating structure may be provided inside the end cap 212, and the insulating structure may be used to isolate the electrical connection components in the housing 211 from the end cap 212 to reduce the risk of short circuit.
  • the structure can be plastic, rubber, etc.
  • FIG. 4 is a schematic diagram of the structure of the electrode assembly provided in some embodiments of the present application.
  • the electrode assembly 100 is a component in the battery cell 200 where an electrochemical reaction occurs.
  • One or more electrode assemblies 100 may be included in the housing 211.
  • the electrode assembly 100 is mainly formed by winding or stacking the positive electrode sheet 110 and the negative electrode sheet 120, and a diaphragm 130 is usually provided between the positive electrode sheet 110 and the negative electrode sheet 120, and the diaphragm 130 is used to separate the positive electrode sheet 110 and the negative electrode sheet 120 to reduce the risk of short circuit between the positive electrode sheet 110 and the negative electrode sheet 120.
  • the parts of the positive electrode sheet 110 and the negative electrode sheet 120 with active materials constitute the main body of the electrode assembly 100, and the parts of the positive electrode sheet 110 and the negative electrode sheet 120 without active materials each constitute a pole ear.
  • the positive pole ear and the negative pole ear may be located at one end of the main body or at both ends of the main body respectively.
  • Figure 5 is a schematic diagram of the structure of the winding needle provided in some embodiments of the present application
  • Figure 6 is a schematic diagram of the structure of the winding needle in Figure 5 from another perspective
  • Figure 7 is a schematic diagram of the structure of the winding needle provided in some other embodiments of the present application
  • Figure 8 is a schematic diagram of the structure of the winding needle in Figure 7 from another perspective
  • Figure 9 is a schematic diagram of the structure of the winding needle provided in some other embodiments of the present application
  • Figure 10 is a schematic diagram of the structure of the winding needle in Figure 9 from another perspective
  • Figure 11 is a schematic diagram of the structure of the winding device provided in some embodiments of the present application.
  • the embodiment of the present application provides a winding needle 1, including a winding needle body 2, a pair of first grooves 3 are arranged on the outer circumference of the winding needle body 2, the first grooves 3 are used to accommodate the first clamping needle 11, and the pair of first grooves 3 are arranged at intervals along the circumference of the winding needle body 2; wherein, at least one second groove 4 is also arranged on the outer circumference of the winding needle body 2, the second groove 4 is used to accommodate the second clamping needle 12, and the second groove 4 and the first groove 3 are arranged at intervals along the circumference of the winding needle body 2.
  • the winding needle 1 is used to wind the positive electrode sheet 110 , the negative electrode sheet 120 and the separator 130 to form the electrode assembly 100 , wherein the electrode assembly 100 can be wound on the outer circumference of the winding needle body 2 .
  • the winding needle body 2 can be a rotating body, which can be a cylinder.
  • the electrode assembly 100 formed by winding the winding needle body 2 has a hollow ring-shaped cross-section in the axial direction of the winding needle body 2, and the electrode assembly 100 includes an inner ring and an outer ring.
  • the winding needle body 2 when the winding needle 1 is wound to form the electrode assembly 100, the winding needle body 2 may be arranged in such a manner that the outer peripheral surface of the winding needle body 2 is arranged horizontally so that the axial direction of the winding needle body 2 is located in the horizontal direction.
  • the pair of first grooves 3 With the axial direction of the winding needle body 2 as the observation direction, the pair of first grooves 3 are located in the horizontal direction, and in the vertical direction, the second groove 4 is located above the line connecting the pair of first grooves 3.
  • the electrode assembly 100 is formed by winding the outer circumference of the winding needle body 2, a pair of first clamping needles 11 are respectively inserted into the pair of first grooves 3, and a second clamping needle 12 is inserted into the second groove 4.
  • the pair of first clamping needles 11 are moved away from each other in the horizontal direction, abutted against the inner circle of the electrode assembly 100, and the electrode assembly 100 is stretched in the horizontal direction.
  • the upper and lower parts of the electrode assembly 100 are close to each other in the vertical direction. Due to the action of gravity, the descending speed of the upper part of the electrode assembly 100 will be greater than the rising speed of the lower part of the electrode assembly 100.
  • the second clamping needle 12 abuts against the upper part of the electrode assembly 100 to reduce the descending speed of the upper part.
  • the number of the second groove 4 may be one.
  • the number of the second grooves 4 can be multiple.
  • the second grooves 4 and the second clamping needles 12 may be arranged in a one-to-one correspondence.
  • the technical solution of the embodiment of the present application is to provide a pair of circumferentially spaced first grooves 3 and a second groove 4 different from the first groove 3 on the outer circumferential surface of the winding needle body 2.
  • the pair of first grooves 3 are provided on both sides in the vertical direction, and the second groove 4 is provided above the line connecting the pair of first grooves 3.
  • the electrode assembly 100 is formed by winding the outer circumferential surface of the winding needle body 2.
  • the first clamping needle 11 is accommodated by the first groove 3
  • the second clamping needle 12 is accommodated by the second groove 4, so as to determine the positions of the first clamping needle 11 and the second clamping needle 12.
  • the second clamping needle 12 whose position is determined by the second groove 4 abuts against the upper half of the electrode assembly 100, thereby reducing the descending speed of the upper half and reducing the risk of the upper half collapsing due to the upper half descending too fast due to gravity, thereby causing wrinkling.
  • it also reduces the probability of the pole ear folding when the pole ear is located in the upper half, thereby reducing the risk of lithium deposition in the electrode assembly 100, improving the reliability of the battery cell 200, and thus improving the reliability of the battery 300.
  • a pair of first grooves 3 are arranged along the circumference of the winding needle body 2 at intervals of 180°.
  • a pair of first grooves 3 may be arranged at intervals of 180° along the circumference of the winding needle body 2.
  • the pair of first grooves 3 are located on the same horizontal plane, and the pair of first grooves 3 are located at both ends of the winding needle body 2.
  • a pair of first clamping needles 11 are respectively accommodated in a pair of first grooves 3, and the first clamping needles 11 are far away from each other in the horizontal direction, that is, the pair of first clamping needles 11 respectively abut against two inner circle walls of the wound electrode assembly 100, and the two inner circle walls are two inner circle walls corresponding to the diameter of the electrode assembly 100 in the horizontal direction.
  • a pair of first grooves 3 are arranged at 180° intervals along the circumference of the winding needle body 2, that is, with the axial direction of the winding needle body 2 as the observation direction, on the axial surface of the winding needle body 2, a pair of first grooves 3 can be arranged on the same horizontal plane.
  • the angle at which the pair of first grooves 3 are spaced apart along the circumference of the winding needle body 2 may also be between 170° and 180°, for example, 170°, 171°, 172°, 173°, 174°, 175°, 176°, 177°, 178°, 179°, 180°, etc.
  • the angle setting between the pair of first grooves 3 is affected by processing errors, when setting the pair of first grooves 3, with the axial direction of the winding needle body 2 as the observation direction, on the surface of the winding needle body 2 in the axial direction, the pair of grooves are set to be symmetrical with respect to the diameter of the electrode assembly 100 in the vertical direction.
  • the technical solution of the embodiment of the present application is to set a pair of first grooves 3 at an interval of 180° on the outer circumferential surface of the winding needle body 2, wherein the electrode assembly 100 is formed by winding the outer circumferential surface of the winding needle body 2, and the pair of first grooves 3 are set on both sides in the vertical direction, that is, the pair of first grooves 3 are located on the diameter of the electrode assembly 100 in the horizontal direction, and the first grooves 3 are used to accommodate the first clamping needles 11.
  • the first clamping needles 11 are separated from each other in the horizontal direction, which can achieve the best stretching effect of the electrode assembly 100 and facilitate the setting of the second grooves 4, thereby improving convenience.
  • the angle between the second groove 4 and one of the first grooves 3 is ⁇ , which satisfies: 45° ⁇ 90°.
  • the angle between the second groove 4 and one of the first grooves 3 can be ⁇ , at this time, the angle between the second groove 4 and the other first groove 3 can be 180°- ⁇ , ⁇ satisfies 45° ⁇ 90°, where ⁇ can be 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, etc.
  • the angle ⁇ can be measured in the following manner: With the axial direction of the winding needle body 2 as the observation direction, on the axial surface of the winding needle body 2, taking one of the first grooves 3 as an example, the angle between the extension line of the wall of one of the first grooves 3 away from the second groove 4 and the extension line of the wall of the second groove 4 close to the first groove 3 is ⁇ .
  • the angle between the second groove 4 and one of the first grooves 3 is ⁇ , and when in use, a pair of first grooves 3 are arranged horizontally, and the second groove 4 is arranged above the first groove 3, and the first groove 3 is used to accommodate the first clamping needle 11, and the second groove 4 is used to accommodate the second clamping needle 12.
  • the size of ⁇ corresponds to the position of the second clamping needle 12 corresponding to the wound electrode assembly 100.
  • the second clamping needle 12 abuts The upper part of the electrode assembly 100 is closer to the upper end of the electrode assembly 100 and has a smaller angle away from the upper end of the electrode assembly 100.
  • the second clamping needle 12 abuts against the upper part of the electrode assembly 100, which reduces the descending speed of the upper part of the electrode assembly 100 and reduces the risk of the upper part collapsing and wrinkling due to the upper part falling too quickly due to gravity. It also reduces the probability of the pole ear folding when it is located in the upper part, thereby reducing the risk of lithium deposition in the electrode assembly 100 and improving the reliability of the battery cell 200, thereby improving the reliability of the battery 300.
  • the angle between the second groove 4 and one of the first grooves 3 can be ⁇ , at which time the angle between the second groove 4 and the other first groove 3 can be 180°- ⁇ , and ⁇ satisfies 60° ⁇ 90°, wherein ⁇ can be 60°, 65°, 70°, 75°, 80°, 85°, 90°, etc.
  • the second clamping needle 12 when 60° ⁇ 90°, that is, the first clamping needle 11 and the second clamping needle 12 are farther apart, the second clamping needle 12 is closer to the upper end of the electrode assembly 100, and the angle of deviation from the upper end of the electrode assembly 100 is smaller, and the second clamping needle 12 abuts against the upper half of the electrode assembly 100, thereby reducing the descending speed of the upper half of the electrode assembly 100, and reducing the risk of the upper half collapsing and wrinkling due to the upper half descending too quickly due to gravity, and also reducing the probability of the pole ear folding when it is located in the upper half, thereby reducing the risk of lithium plating of the electrode assembly 100, and improving the reliability of the battery cell 200, thereby improving the reliability of the battery 300.
  • the angle between the second groove 4 and one of the first grooves 3 can be ⁇ , at which time the angle between the second groove 4 and the other first groove 3 can be 180°- ⁇ , and ⁇ satisfies 85° ⁇ 90°, where ⁇ can be 85°, 86°, 87°, 88°, 89°, 90°, etc.
  • the number of the second groove 4 may be one, and ⁇ may be 90°.
  • the second clamping needle 12 when 85° ⁇ 90°, that is, the second clamping needle 12 abuts against the uppermost end of the electrode assembly 100, and deviates from the uppermost end of the electrode assembly 100 due to positioning error or process reasons, the second clamping needle 12 abuts against the upper half of the electrode assembly 100, thereby reducing the descending speed of the upper half of the electrode assembly 100, and reducing the risk of the upper half collapsing and wrinkling due to the upper half descending too quickly due to gravity, and also reducing the probability of the pole ear folding when it is located in the upper half, thereby reducing the risk of lithium deposition of the electrode assembly 100, and improving the reliability of the battery cell 200, thereby improving the reliability of the battery 300.
  • the outer circumference of the winding needle body 2 is divided into a first area 5 and a second area 6 by a pair of first grooves 3 , and there are multiple second grooves 4 , which are all disposed in the first area 5 .
  • first area 5 there is no special distinguishing mark between the first area 5 and the second area 6 , and the area where the second groove 4 is provided may be the first area 5 .
  • the plurality of second grooves 4 may all be disposed in the second region 6 , and no second grooves 4 may be disposed in the first region 5 .
  • the outer peripheral surface of the winding needle body 2 is divided into a first area 5 and a second area 6 by a pair of first grooves 3, and a plurality of second grooves 4 are all arranged in the first area 5.
  • the pair of first grooves 3 are arranged in the horizontal direction, and the second grooves 4 of the first area 5 are arranged above the pair of first grooves 3.
  • the second grooves 4 are used to accommodate the second clamping needle 12.
  • the second clamping needle 12 abuts against the upper half of the electrode assembly 100, thereby reducing the descending speed of the upper half of the electrode assembly 100, reducing the risk of the upper half collapsing due to the rapid descent of the upper half due to the action of gravity, thereby causing wrinkles, and also reducing the probability of the pole ear folding when the pole ear is located in the upper half, thereby reducing the risk of lithium deposition of the electrode assembly 100, improving the reliability of the battery cell 200, and thus improving the reliability of the battery 300.
  • a pair of first grooves 3 are symmetrically arranged relative to the first plane 7, the central axis of the winding needle body 2 is located on the first plane 7, and there are multiple second grooves 4, which are symmetrically arranged relative to the first plane 7.
  • the number of the second grooves 4 can be an even number, and the outer peripheral surface of the winding needle body 2 is horizontally arranged so that the axial direction of the winding needle body 2 is located in the horizontal direction.
  • a pair of first grooves 3 are located in the horizontal direction and are symmetrically arranged relative to the first plane 7, and the even number of second grooves 4 are all located above the pair of first grooves 3, and the even number of second grooves 4 are symmetrically arranged relative to the first plane 7.
  • the number of the second grooves 4 can be an odd number greater than one, and the outer peripheral surface of the winding needle body 2 is horizontally arranged so that the axial direction of the winding needle body 2 is located in the horizontal direction.
  • a pair of first grooves 3 are located in the horizontal direction and are symmetrically arranged relative to the first plane 7.
  • the even-numbered second grooves 4 are all located above the pair of first grooves 3.
  • One second groove 4 can be arranged on the first plane 7, and the remaining even-numbered second grooves 4 are symmetrically arranged relative to the first plane 7.
  • the technical solution of the embodiment of the present application is to arrange multiple second grooves 4 symmetrically relative to the first plane 7, and the central axis of the winding needle body 2 is located on the first plane 7, that is, when in use, a pair of first grooves 3 are arranged in the horizontal direction, and the electrode assembly 100 is formed by winding the outer peripheral surface of the winding needle body 2, and the second grooves 4 are symmetrically arranged relative to the diameter of the electrode assembly 100 in the vertical direction, and the second clamping needles 12 are accommodated in the second grooves 4, so that the multiple second clamping needles 12 respectively abut the parts of the electrode assembly 100 on both sides of the diameter in the vertical direction, so that the abutting effect of the second clamping needles 12 located on both sides of the diameter of the electrode assembly 100 in the vertical direction is symmetrical, thereby reducing the descending speed of the upper half of the electrode assembly 100, and reducing the risk of the upper half collapsing due to the upper half descending too fast due to gravity, thereby causing w
  • first groove 3 and the second groove 4 both penetrate the winding needle body 2 along the axial direction of the winding needle body 2.
  • the first clamping needle 11 can be accommodated in the first groove 3, and the second clamping needle 12 can be accommodated in the second groove 3.
  • the length of the first clamping needle 11 may be greater than the axial length of the first groove 3 in the winding needle body 2
  • the length of the second clamping needle 12 may be greater than the axial length of the second groove 4 in the winding needle body 2 .
  • both the first groove 3 and the second groove 4 penetrate the winding needle body 2 along the axial direction of the winding needle body 2.
  • the first clamping needle 11 can be accommodated in the first groove 3, and both ends of the first clamping needle 11 can pass through the first groove 3, or one end of the first clamping needle 11 can pass through the first groove 3 and the other end can be accommodated in the first groove 3;
  • the second clamping needle 12 can be accommodated in the second groove 4, and both ends of the second clamping needle 12 can pass through the second groove 4, or one end of the second clamping needle 12 can pass through the second groove 4 and the other end can be accommodated in the second groove 4.
  • first groove 3 and the second groove 4 may not penetrate the winding needle body 2 along the axial direction of the winding needle body 2.
  • One end of the first clamping needle 11 may abut against the wall surface of the first groove 3 in the axial direction of the winding needle body 2, and the other end may pass through the first groove 3;
  • one end of the second clamping needle 12 may abut against the wall surface of the second groove 4 in the axial direction of the winding needle body 2, and the other end may pass through the second groove 4.
  • the first groove 3 and the second groove 4 extend along the axial direction of the winding needle body 2 and penetrate the winding needle body 2, the first groove 3 is used to accommodate the first clamping needle 11, and the second groove 4 is used to accommodate the second clamping needle 12, which improves the convenience of the first clamping needle 11 and the second clamping needle 12 during the installation process.
  • the positions of the first clamping needle 11 and the second clamping needle 12 are determined, which improves the accuracy of the installation positions of the first clamping needle 11 and the second clamping needle 12, and also facilitates the removal of the winding needle 1, reducing the risk of interference between the winding needle 1 and the first clamping needle 11 and the second clamping needle 12 during the removal process.
  • the needle winding body 2 includes a first needle winding portion 8 and a second needle winding portion 9, a gap is defined between the first needle winding portion 8 and the second needle winding portion 9, the second groove 4 and one of the first grooves 3 are arranged on the outer circumference of the first needle winding portion 8, and the other first groove 3 is arranged on the outer circumference of the second needle winding portion 9.
  • the technical solution of the embodiment of the present application is that the first winding needle part 8 and the second winding needle part 9 form a winding needle body 2, and the first winding needle part 8 and the second winding needle part 9 define a gap, wherein one first groove 3 is set in the first winding needle part 8, and the other first groove 3 is set in the second winding needle part 9. Therefore, when using the winding needle 1, the size of the gap can be changed by moving the first winding needle part 8 and the second winding needle part 9, thereby changing the relative position of the first winding needle part 8 and the second winding needle part 9, thereby realizing fine adjustment of a pair of first grooves 3 during setting.
  • the accuracy of the installation position of the first clamping needle 11 is improved, thereby improving the stretching effect of the electrode assembly 100, improving the reliability of the electrode assembly 100, and improving the reliability of the battery cell 200 and the battery 300.
  • Figure 12 is a structural schematic diagram of the winding device in Figure 11 from another perspective
  • Figures 13 to 17 are process schematic diagrams of the winding method of the present application
  • Figure 18 is a structural schematic diagram of the first driving member and the second driving member of the winding device in Figure 11
  • Figure 19 is a flow chart of the winding method of some embodiments of the present application.
  • the present application also provides a winding device 10 for winding an electrode assembly 100, comprising a winding needle 1 as in any embodiment of the first aspect, a pair of first clamping needles 11 and at least one second clamping needle 12, the pair of first clamping needles 11 are configured to move away from each other after the winding needle 1 is withdrawn from the electrode assembly 100 to open the electrode assembly 100, and the second clamping needle 12 is configured to support the upper half of the electrode assembly 100 during the process of the pair of first clamping needles 11 opening the electrode assembly 100.
  • the winding needle 1 includes a winding needle body 2.
  • a pair of first grooves 3 can be arranged at intervals of 180° along the circumference of the winding needle body 2, and a second groove 4 is also arranged on the outer circumferential surface.
  • the electrode assembly 100 is wound and formed on the outer circumferential surface of the winding needle body 2, and please refer to Figure 14, a pair of first clamping needles 11 are respectively accommodated in the pair of first grooves 3, and the second clamping needle 12 is accommodated in the second groove 4, and the winding needle 1 is pulled out of the electrode assembly 100.
  • the pair of first clamping needles 11 are located in the same horizontal direction, and the second clamping needle 12 is located above the first clamping needle 11 and on the first plane 7.
  • a pair of first clamping needles 11 are moved away from each other in the horizontal direction.
  • a pair of first clamping needles 11 are respectively abutted against the inner circle parts corresponding to the inner diameter of the electrode assembly 100 in the horizontal direction, and the electrode assembly 100 is stretched in the horizontal direction.
  • the second clamping needles 12 are abutted against the inner circle parts corresponding to the inner diameter of the electrode assembly 100 in the vertical direction to support the upper half of the electrode assembly 100 to reduce the descending speed of the upper half during the stretching process.
  • the technical solution of the embodiment of the present application is to set the first clamping needle 11 in the first groove 3, and the second clamping needle 12 in the second groove 4. After the electrode assembly 100 is wound and formed, the winding needle 1 is taken out, and the two first clamping needles 11 move away from each other in the horizontal direction and abut against the two inner walls of the electrode assembly 100 opposite to each other in the horizontal direction to stretch the electrode assembly 100 in the horizontal direction.
  • the two inner walls of the electrode assembly 100 opposite to each other in the vertical direction are close to each other, and the second clamping needle 12 abuts against the upper half of the electrode assembly 100, reducing the descending speed of the upper half, reducing the risk of the upper half collapsing due to the upper half descending too fast due to gravity, thereby causing wrinkling, and also reducing the probability of the pole ear folding when the pole ear is located in the upper half, thereby reducing the risk of lithium plating of the electrode assembly 100, improving the reliability of the battery cell 200, and thus improving the reliability of the battery 300.
  • the second clamping needle 12 has a first wall away from the central axis of the winding needle body 2
  • the first wall surface 13 is configured as a curved surface.
  • the wall away from the central axis of the winding needle body 2 is the first wall 13 , wherein the first wall 13 may be an arc surface that protrudes away from the central axis of the winding needle body 2 .
  • the second clamping needle 12 abuts the upper half of the electrode assembly 100, and the second clamping needle 12 has a first wall 13 away from the central axis of the winding needle body 2, and the first wall 13 abutting the upper half of the electrode assembly 100 is an arc surface. Since the electrode assembly 100 after winding is annular and the inner wall of the electrode assembly 100 is an arc surface, the first wall 13 is constructed as an arc surface, which can make the second clamping needle 12 abut the upper half of the electrode assembly 100 more smooth, thereby reducing the risk of damaging the electrode assembly 100, thereby improving the reliability of the battery 300.
  • the winding device 10 further includes a heating element 14 , and the heating element 14 is connected to the second clamping needle 12 to heat the second clamping needle 12 .
  • the heating element 14 may be in direct contact with the second clamping needle 12 to achieve heat conduction.
  • the heating element 14 may not be in direct contact with the second clamping needle 12 , and only needs to form a thermally conductive connection that enables heat exchange.
  • the technical solution of the embodiment of the present application is to set a heating element 14 connected to the second clamping needle 12 for heating the second clamping needle 12, wherein the second clamping needle 12 is used to abut the upper half of the electrode assembly 100, and the upper half includes a positive electrode sheet, a negative electrode sheet and a diaphragm 130 for bonding the positive and negative electrode sheets.
  • the second clamping needle 12 is heated to melt the adhesive of the diaphragm 130 in the upper half, thereby making the bonding between the diaphragm 130 and the positive and negative electrode sheets stronger, reducing the risk of wrinkling the electrode sheets, and improving the reliability of the electrode assembly 100, thereby improving the reliability of the battery 300.
  • the heating element 14 is a resistive element.
  • the technical solution of the embodiment of the present application sets the heating element 14 as a resistance element, which is easy to obtain and easy to achieve the heating effect, thereby improving the convenience of heating.
  • the winding device 10 also includes a first driving member 15 and a second driving member 16.
  • the first driving member 15 is connected to a pair of first clamping needles 11 to drive the pair of first clamping needles 11 away from each other along a first direction X
  • the second driving member 16 is connected to the second clamping needle 12 to drive the second clamping needle 12 to move along a second direction Y, wherein the first direction X and the second direction Y intersect.
  • the first driving member 15 may include two driving arms, the two driving arms are respectively connected to a pair of first clamping needles 11, and drive the pair of first clamping needles 11 away from each other along the first direction X, and the second driving member 16 is connected to the second clamping needle 12 to drive the second clamping needle 12 to move along the second direction Y.
  • the first direction X can be a horizontal direction
  • the second direction Y can be a vertical direction.
  • first driving member 15 drives the pair of first clamping needles 11 away from each other in the horizontal direction
  • second driving member 16 drives the second clamping needle 12 to move downward in the vertical direction until the pair of first clamping needles 11 and the second clamping needle 12 are located in the same horizontal direction.
  • the first direction X can be represented by X
  • the second direction Y can be represented by Y.
  • the technical solution of the embodiment of the present application is to drive a pair of first clamping needles 11 away from each other along the first direction X by setting a first driving member 15 connected to the first clamping needle 11, and to drive a pair of first clamping needles 11 away from each other along the first direction X, and to drive a second driving member 16 to drive the second clamping needle 12 to move downward along the second direction Y, so that the two first clamping needles 11 move away from each other along the first direction X, and abut against two inner walls of the electrode assembly 100 opposite to each other in the first direction X, so as to stretch the electrode assembly 100 along the first direction X, so that the second clamping needle 12 moves downward in the second direction Y, and abuts against the upper half of the electrode assembly 100 during the movement, thereby reducing the descending speed of the upper half, reducing the risk of the upper half collapsing due to the upper half falling too fast due to gravity, and causing wrinkles, and also reducing the probability of the tab folding when the tab is
  • an embodiment of the present application further provides a battery 300 manufacturing device, comprising a winding device 10 as in any one of the embodiments of the second aspect.
  • the technical solution of the embodiment of the present application is to complete the winding of the electrode assembly 100 by the winding device 10, and then manufacture the battery 300 or the battery cell 200 by the battery 300 manufacturing equipment.
  • the winding device 10 includes a winding needle 1, a first clamping needle 11 and a second clamping needle 12.
  • the first clamping needle 11 is set in the first groove 3 of the winding needle 1
  • the second clamping needle 12 is set in the second groove 4 of the winding needle 1.
  • the two first clamping needles 11 move away from each other in the horizontal direction and abut against the two inner walls of the electrode assembly 100 opposite to each other in the horizontal direction to stretch the electrode assembly 100 in the horizontal direction.
  • the electrode The two inner walls of the assembly 100 that are opposite to each other in the vertical direction are close to each other, wherein the second clamping needle 12 abuts against the upper half of the electrode assembly 100, thereby reducing the descending speed of the upper half, reducing the risk of the upper half collapsing and wrinkling due to the upper half descending too quickly due to gravity, and also reducing the probability of the pole ear folding when it is located in the upper half, thereby reducing the risk of lithium deposition in the electrode assembly 100, improving the reliability of the battery cell 200, and thus improving the reliability of the battery 300.
  • Figure 19 is a flow chart of the winding method of some embodiments of the present application.
  • the embodiments of the present application also provide a winding method, including: S100 provides a winding needle 1 as in any embodiment of the first aspect.
  • S200 the winding needle 1 winds the pole piece and the diaphragm 130 to form the electrode assembly 100.
  • S300 insert a pair of first clamping needles 11 into a pair of first grooves 3, and insert the second clamping needle 12 into the second groove 4.
  • S400 remove the winding needle 1 from the electrode assembly 100.
  • S500 move a pair of first clamping needles 11 away from each other to open the electrode assembly 100.
  • S600 In the process of opening the electrode assembly 100, the upper half of the electrode assembly 100 is supported by the second clamping needle 12.
  • the technical solution of the embodiment of the present application is to wind the positive and negative electrode sheets and the separator 130 to form the electrode assembly 100 through the provided winding needle 1, and then insert the first clamping needle 11 into the first groove 3 of the winding needle 1, and insert the second clamping needle 12 into the second groove 4 of the winding needle 1 to form a winding device 10, and then pull the winding needle 1 out of the electrode assembly 100, so that the first clamping needle 11 and the second clamping needle 12 can move.
  • a pair of first clamping needles 11 are moved away from each other, abutting against the two inner walls opposite to the electrode assembly 100 while propping up the electrode assembly 100 to achieve stretching of the electrode assembly 100.
  • the second clamping needle 12 supports the upper half of the electrode assembly 100, reduces the descending speed of the upper half, reduces the risk of the upper half collapsing due to the rapid descent of the upper half due to gravity, and thus causes wrinkling, and also reduces the probability of the pole ear folding when the pole ear is located in the upper half, thereby reducing the risk of lithium deposition in the electrode assembly 100, improving the reliability of the battery cell 200, and thus improving the reliability of the battery 300.
  • the upper half of the electrode assembly 100 is supported by the second clamping needle 12 so that the movement speed of the area where the upper half contacts the second clamping needle 12 is less than or equal to the movement speed of the area where the lower half of the electrode assembly 100 faces the second clamping needle 12.
  • the technical solution of the embodiment of the present application supports the upper half of the electrode assembly 100 by the second clamping needle 12, reduces the descending speed of the upper half, and makes the moving speed of the contact area of the upper half and the second clamping needle 12 less than or equal to the moving speed of the area of the lower half of the electrode assembly 100 directly facing the second clamping needle 12.
  • the second clamping needle 12 reduces the risk of the upper half collapsing and wrinkling due to the upper half descending too quickly due to gravity, and also reduces the probability of the pole ear folding when it is located in the upper half, thereby reducing the risk of lithium deposition of the electrode assembly 100, improving the reliability of the battery cell 200, and thus improving the reliability of the battery 300.

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Abstract

本申请实施例提供一种卷针、卷绕装置、电池制造设备及卷绕方法。卷绕装置包括卷针、一对第一夹针和至少一个第二夹针，一对第一夹针被配置为，在卷针抽离电极组件后，向彼此远离的方向移动，以将电极组件撑开，第二夹针被配置为，在一对第一夹针撑开电极组件的过程中，对电极组件的上半部分进行支撑。卷针包括卷针本体，卷针本体的外周面上设置有一对第一凹槽，第一凹槽用于容置第一夹针，一对第一凹槽沿卷针本体的周向间隔设置，卷针本体的外周面上还设置有至少一个第二凹槽，第二凹槽用于容置第二夹针，第二凹槽与第一凹槽沿卷针本体的周向间隔设置。本申请提供的技术方案能够提高电池的可靠性。

Description

卷针、卷绕装置、电池制造设备及卷绕方法
相关申请的交叉引用
本申请要求享有于2023年7月3日提交的名称为“卷针、卷绕装置、电池制造设备及卷绕方法”的中国专利申请202310807055.2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
本申请涉及电池生产技术领域，具体而言，涉及一种卷针、卷绕装置、电池制造设备及卷绕方法。
背景技术
节能减排是汽车产业可持续发展的关键，电动车辆由于其节能环保的优势成为汽车产业可持续发展的重要组成部分。对于电动车辆而言，电池技术又是关乎其发展的一项重要因素。
在电池技术的发展中，如何提高电池的可靠性，是电池技术中一个亟需解决的技术问题。
发明内容
本申请提供一种卷针、卷绕装置、电池制造设备及卷绕方法，其能够提高电池的可靠性。
本申请是通过下述技术方案实现的：
第一方面，本申请提供一种卷针，包括卷针本体，卷针本体的外周面上设置有一对第一凹槽，第一凹槽用于容置第一夹针，一对第一凹槽沿卷针本体的周向间隔设置；其中，卷针本体的外周面上还设置有至少一个第二凹槽，第二凹槽用于容置第二夹针，第二凹槽与第一凹槽沿卷针本体的周向间隔设置。
本申请实施例的技术方案，在卷针本体的外周面上设置一对周向间隔的第一凹槽以及区别于第一凹槽的第二凹槽，在使用时，将一对第一凹槽设置于竖直方向的两侧，将第二凹槽设置于一对第一凹槽连线的上方，通过卷针本体的外周面卷绕成型电极组件，通过第一凹槽容置第一夹针，通过第二凹槽容置第二夹针，从而确定第一夹针和第二夹针的位置，在后续电极组件的拉伸工序中，通过第二凹槽确定位置的第二夹针，与电极组件的上半部分抵接，降低上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件析锂的风险，提高了电池单体的可靠性，从而提高了电池的可靠性。
在一些实施例中，一对第一凹槽沿卷针本体的周向间隔180°设置。
本申请实施例的技术方案，将一对第一凹槽间隔180°设置于卷针本体的外周面上，其中通过卷针本体的外周面卷绕成型电极组件，且将一对第一凹槽设置于竖直方向的两侧，也即一对第一凹槽位于电极组件在水平方向的直径上，第一凹槽用于容置第一夹针，在后续电极组件的拉伸工序中，第一夹针沿水平方向彼此远离，能够使得电极组件的拉伸效果最好，且能够便于第二凹槽的设置，提高了便利性。
在一些实施例中，在卷针本体的周向上，第二凹槽与其中一个第一凹槽间隔的角度为α，满足：45°≤α≤90°。
本申请实施例的技术方案，第二凹槽与其中一个第一凹槽间隔的角度为α，而在使用时，一对第一凹槽水平设置，第二凹槽设置于第一凹槽的上方，而第一凹槽用于容置第一夹针，第二凹槽用于容置第二夹针，α的大小对应第二夹针对应于卷绕的电极组件的位置，当45°≤α≤90°时，即第一夹针和一第二夹针离得较远，也即第二夹针在竖直方向上的高度较高，第二夹针抵接的上半部分的部分距离电极组件最上端较近，偏离电极组件最上端的角度较小，第二夹针与电极组件的上半部分抵接，降低了电极组件的上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件析锂的风险，提高了电池单体的可靠性，从而提高了电池的可靠性。
在一些实施例中，60°≤α≤90°。
本申请实施例的技术方案，当60°≤α≤90°时，即第一夹针和一第二夹针离得更远，第二夹针更靠近电极组件的最上端，偏离电极组件最上端的角度较小，第二夹针与电极组件的上半部分抵接，降低了电极组件的上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件析锂的风险，提高了电池单体的可靠性，从而提高了电池的可靠性。
在一些实施例中，85°≤α≤90°。
本申请实施例的技术方案，当85°≤α≤90°时，即第二夹针与电极组件的最上端抵接，由于定位误差或者是工艺原因偏离电极组件最上端，第二夹针与电极组件的上半部分抵接，降低了电极组件的上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件析锂的风险，提高了电池单体的可靠性，从而提高了电池的可靠性。
在一些实施例中，卷针本体的外周面由一对第一凹槽分为第一区域和第二区域，第二凹槽为多个，多个第二凹槽均设置于第一区域。
本申请实施例的技术方案，由于在重力作用下，只有电极组件的上半部分会由于下降过快导致上半部分塌陷从而导致上半部分的极片或者极耳打皱，也即只有电极组件的上半部分需要抵接支撑。通过一对第一凹槽将卷针本体的外周面分为第一区域和第二区域，且多个第二凹槽均设置于第一区域，同时在使用时将一对第一凹槽设置于水平方向，且将第一区域的第二凹槽设置于一对第一凹槽的上方，第二凹槽用于容置第二夹针，通过第二夹针抵接电极组件的上半部分，降低了电极组件的上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件析锂的风险，提高了电池单体的可靠性，从而提高了电池的可靠性。通过将第二凹槽设置于第一区域，而在使用时将第一区域设置于第一凹槽的上方，降低了设置第二夹针时将第二夹针设置于第一凹槽的下方的概率，同时也节约了成本，提高了安装的便利性。
在一些实施例中，一对第一凹槽相对于第一平面对称设置，卷针本体的中心轴线位于第一平面上，第二凹槽为多个，多个第二凹槽相对于第一平面对称设置。
本申请实施例的技术方案，通过将多个第二凹槽相对于第一平面对称设置，且卷针本体的中心轴线位于第一平面上，也即在使用时，将一对第一凹槽设置于水平方向，通过卷针本体的外周面卷绕成型电极组件，第二凹槽相对于电极组件在竖直方向上的直径对称设置，第二夹针容置于第二凹槽，从而使得多个第二夹针分别抵接电极组件相对于竖直方向上的直径两侧的部分，使得位于电极组件相对于竖直方向上的直径两侧的第二夹针的抵接效果对称，降低了电极组件的上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件析锂的风险，提高了电池单体的可靠性，从而提高了电池的可靠性。
在一些实施例中，第一凹槽和第二凹槽均沿卷针本体的轴向贯穿卷针本体。
本申请实施例的技术方案，第一凹槽和第二凹槽沿卷针本体的轴向延伸且贯穿卷针本体，第一凹槽用于容置第一夹针，第二凹槽用于容置第二夹针，提高了第一夹针和第二夹针在安装过程的便利性，通过确定第一凹槽和第二凹槽的位置，以此来确定第一夹针和第二夹针的位置，提高了安装第一夹针和第二夹针位置的准确性，同时也便于卷针的抽离，降低了抽离过程中卷针与第一夹针和第二夹针干涉的风险。
在一些实施例中，卷针本体包括第一卷针部和第二卷针部，第一卷针部与第二卷针部之间限定出间隙，第二凹槽和其中一个第一凹槽设置于第一卷针部的外周面上，另一个第一凹槽设置于第二卷针部的外周面上。
本申请实施例的技术方案，通过第一卷针部和第二卷针部组成卷针本体，且第一卷针部和第二卷针部限定出间隙，其中一个第一凹槽设置于第一卷针部，另一个第一凹槽设置于第二卷针部，以此在使用卷针时，可以通过移动第一卷针部和第二卷针部，改变间隙的大小从而改变第一卷针部和第二卷针部的相对位置，以此实现一对第一凹槽在设置时的微调，通过第一凹槽容置第一夹针，提高了第一夹针安装位置的准确性，从而提高了电极组件拉伸的效果，提高了电极组件的可靠性，提高了电池单体和电池的可靠性。
第二方面，本申请还提供一种卷绕装置，用于卷绕成型电极组件，包括如第一方面实施例中任一实施例的卷针、一对第一夹针和至少一个第二夹针，一对第一夹针被配置为，在卷针抽离电极组件后，向彼此远离的方向移动，以将电极组件撑开，第二夹针被配置为，在一对第一夹针撑开电极组件的过程中，对电极组件的上半部分进行支撑。
本申请实施例的技术方案，将第一夹针设置于第一凹槽，将第二夹针设置于第二凹槽，卷针将电极组件卷绕成型之后取出，两个第一夹针在水平方向上向彼此远离的方向移动，与电极组件在水平方向上相对的两个内壁抵接，以将电极组件沿水平方向拉伸，此时电极组件在竖直方向上相对的两个内壁相互靠近，其中第二夹针与电极组件的上半部分抵接，降低上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件析锂的风险，提高了电池单体的可靠性，从而提高了电池的可靠性。
在一些实施例中，第二夹针具有远离卷针本体的中心轴线的第一壁面，第一壁面构造为弧面。
本申请实施例的技术方案，通过第二夹针抵接电极组件的上半部分，且第二夹针具有远离卷针本体的中心轴线的第一壁面，抵接电极组件的上半部分的第一壁面为弧面，由于卷绕之后的电极组件为环形，电极组件的内壁为弧面，因此将第一壁面构造为弧面，能够使得第二夹针抵接电极组件的上半部分时更加平滑，降低了损坏电极组件的风险，从而提高电池的可靠性。
在一些实施例中，卷绕装置还包括加热件，加热件与第二夹针连接以为第二夹针加热。
本申请实施例的技术方案，通过设置加热件与第二夹针连接用于为第二夹针加热，其中第二夹针用于抵接电极组件的上半部分，上半部分包括正极片、负极片以及用于粘接正负极片的隔膜，第二夹针加热使得上半部分中隔膜的粘合剂熔化，从而使得与隔膜与正负极片的粘合更加牢固，降低了极片打皱的风险，提高了电极组件的可靠性，从而提高了电池的可靠性。
在一些实施例中，加热件为电阻元件。
本申请实施例的技术方案，将加热件设置为电阻元件，易于获得且容易实现加热效果，提高了加热的便利性。
在一些实施例中，卷绕装置还包括第一驱动件和第二驱动件，第一驱动件与一对第一夹针连接以驱动一对第一夹针沿第一方向远离彼此，第二驱动件与第二夹针连接以驱动第二夹针沿第二方向移动，其中，第一方向和第二方向相交。
本申请实施例的技术方案，通过设置第一驱动件与第一夹针连接从而驱动一对第一夹针沿第一方向远离彼此，设置第二驱动件驱动第二夹针沿第二方向向下移动，使得两个第一夹针沿第一方向相互远离，与电极组件在第一方向上相对的两个内壁抵接，以将电极组件沿第一方向拉伸，使得第二夹针在第二方向上向下移动，且在移动过程中与电极组件的上半部分抵接，降低上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件析锂的风险，提高了电池单体的可靠性，从而提高了电池的可靠性。此外，通过机械化驱动，便于控制第一夹针和第二夹针的速度，也提高了操作的便利性。
第三方面，本申请实施例还提供一种电池制造设备，包括如第二方面实施例中任一实施例的卷绕装置。
本申请实施例的技术方案，通过卷绕装置完成电极组件的卷绕成型，再通过电池制造设备制造电池或者电池单体。其中，卷绕装置包括卷针、第一夹针和第二夹针，将第一夹针设置于卷针的第一凹槽，将第二夹针设置于卷针的第二凹槽，卷针将电极组件卷绕成型之后取出，两个第一夹针在水平方向上向彼此远离的方向移动，与电极组件在水平方向上相对的两个内壁抵接，以将电极组件沿水平方向拉伸，此时电极组件在竖直方向上相对的两个内壁相互靠近，其中第二夹针与电极组件的上半部分抵接，降低上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件析锂的风险，提高了电池单体的可靠性，从而提高了电池的可靠性。
第四方面，本申请实施例还提供一种卷绕方法，包括：提供如第一方面实施例中任一实施例的卷针；卷针卷绕极片和隔膜形成电极组件；将一对第一夹针插入一对第一凹槽中，将第二夹针 插入第二凹槽中；将卷针从电极组件抽离；将一对第一夹针向彼此远离的方向移动，以将电极组件撑开；在将电极组件撑开的过程中，通过第二夹针支撑电极组件的上半部分。
本申请实施例的技术方案，通过提供的卷针将正负极片和隔膜卷绕成型形成电极组件，再将第一夹针插入卷针的第一凹槽，将第二夹针插入卷针的第二凹槽，组成卷绕装置，然后将卷针从电极组件中抽离，从而使得第一夹针和第二夹针能够移动，此时将一对第一夹针向彼此远离的方向移动，与电极组件相对的两个内壁抵接的同时撑开电极组件，以实现电极组件的拉伸，同时第二夹针支撑电极组件的上半部分，降低上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件析锂的风险，提高了电池单体的可靠性，从而提高了电池的可靠性。
在一些实施例中，通过第二夹针支撑电极组件的上半部分，以使上半部分与第二夹针接触区域的移动速度，小于或等于电极组件的下半部分与第二夹针正对的区域的移动速度。
本申请实施例的技术方案，通过第二夹针支撑电极组件的上半部分，降低上半部分的下降速度，使得上半部分与第二夹针接触区域的移动速度，小于或者等于电极组件的下半部分与第二夹针正对的区域的移动速度，通过速度的比较，从而确认第二夹针降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件析锂的风险，提高了电池单体的可靠性，从而提高了电池的可靠性。
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为本申请一些实施例提供的车辆的结构示意图；
图2为本申请一些实施例提供的电池的结构示意图；
图3为本申请一些实施例提供的电池单体的结构示意图；
图4为本申请一些实施例提供的电极组件的结构示意图；
图5为本申请一些实施例提供的卷针的结构示意图；
图6为图5中卷针的另一视角的结构示意图；
图7为本申请另一些实施例提供的卷针的结构示意图；
图8为图7中卷针的另一视角的结构示意图；
图9为本申请又一些实施例提供的卷针的结构示意图；
图10为图9中卷针的另一视角的结构示意图；
图11为本申请一些实施例提供的卷绕装置的结构示意图；
图12为图11中卷绕装置的另一视角的结构示意图；
图13至图17为本申请卷绕方法的过程示意图；
图18为图11中卷绕装置的第一驱动件和第二驱动件的结构示意图；
图19为本申请一些实施例的卷绕方法的流程图。
图标：1-卷针；2-卷针本体；3-第一凹槽；4-第二凹槽；5-第一区域；6-第二区域；7-第一平面；8-第一卷针部；9-第二卷针部；10-卷绕装置；11-第一夹针；12-第二夹针；13-第一壁面；14-加热件；15-第一驱动件；16-第二驱动件；100-电极组件；110-正极极片；120-负极极片；130-隔膜；200-电池单体；210-外壳；211-壳体；212-端盖；220-电极端子；300-电池；310-箱体；311-第一子箱体；312-第二子箱体；1000-车辆；1100-控制器；1200-马达；X-第一方向；Y-第二方向。
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做出创造性劳动前提下所获得的所有其他实施例，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，不是旨在于限定本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。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。
本申请中出现的“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
在一些实施例中，电池可以为电池模块，电池单体有多个时，多个电池单体排列并固定形成一个电池模块。
在一些实施例中，电池可以为电池包，电池包包括箱体和电池单体，电池单体或电池模块容纳于箱体中。
在一些实施例中，箱体可以作为车辆的底盘结构的一部分。例如，箱体的部分可以成为车辆的地板的至少一部分，或者，箱体的部分可以成为车辆的横梁和纵梁的至少一部分。
在一些实施例中，电池可以为储能装置。储能装置包括储能集装箱、储能电柜等。
本申请实施例中，电池单体可以为二次电池，二次电池是指在电池单体放电后可通过充电的方式使活性材料激活而继续使用的电池单体。
电池单体可以但不限于为锂离子电池、钠离子电池、钠锂离子电池、锂金属电池、钠金属电池、锂硫电池、镁离子电池、镍氢电池、镍镉电池、铅蓄电池等。
作为示例，电池单体可以为圆柱形电池单体、棱柱电池单体、软包电池单体或其它形状的电池单体，棱柱电池单体包括方壳电池单体。
电池单体一般包括电极组件。电极组件包括正极、负极以及隔离件。在电池单体充放电过程中，活性离子(例如锂离子)在正极和负极之间往返嵌入和脱出。隔离件设置在正极和负极之间，可以起到防止正负极短路的作用，同时可以使活性离子通过。
在一些实施例中，正极可以为正极极片，正极极片可以包括正极集流体以及设置在正极集流体至少一个表面的正极活性材料。
作为示例，正极集流体具有在其自身厚度方向相对的两个表面，正极活性材料设置在正极集流体相对的两个表面的任意一者或两者上。
作为示例，正极集流体可采用金属箔片或复合集流体。例如，作为金属箔片，可以采用表面镀银处理的铝、表面镀银处理的不锈钢、不锈钢、铜、铝、镍、炭精电极、碳、镍或钛等。复合集流体可包括高分子材料基层和金属层。复合集流体可通过将金属材料(铝、铝合金、镍、镍合金、钛、钛合金、银及银合金等)形成在高分子材料基材(如聚丙烯、聚对苯二甲酸乙二醇酯、聚对苯 二甲酸丁二醇酯、聚苯乙烯、聚乙烯等的基材)上而形成。
作为示例，正极活性材料可包括以下材料中的至少一种：含锂磷酸盐、锂过渡金属氧化物及其各自的改性化合物。但本申请并不限定于这些材料，还可以使用其他可被用作电池正极活性材料的传统材料。
在一些实施例中，负极可以为负极极片，负极极片可以包括负极集流体。
作为示例，负极集流体可采用金属箔片或复合集流体。例如，作为金属箔片，可以采用表面镀银处理的铝、表面镀银处理的不锈钢、不锈钢、铜、铝、镍、炭精电极、用碳、镍或钛等。
在一些实施例中，负极集流体具有在其自身厚度方向相对的两个表面，负极活性材料设置在负极集流体相对的两个表面中的任意一者或两者上。
作为示例，负极活性材料可采用本领域公知的用于电池的负极活性材料。作为示例，负极活性材料可包括以下材料中的至少一种：人造石墨、天然石墨、软炭、硬炭、硅基材料、锡基材料和钛酸锂等。硅基材料可选自单质硅、硅氧化合物、硅碳复合物、硅氮复合物以及硅合金中的至少一种。锡基材料可选自单质锡、锡氧化合物以及锡合金中的至少一种。但本申请并不限定于这些材料，还可以使用其他可被用作电池负极活性材料的传统材料。这些负极活性材料可以仅单独使用一种，也可以将两种以上组合使用。
在一些实施方式中，隔离件为隔膜。本申请对隔膜的种类没有特别的限制，可以选用任意公知的具有良好的化学稳定性和机械稳定性的多孔结构隔膜。
作为示例，隔膜的主要材质可选自玻璃纤维、无纺布、聚乙烯、聚丙烯及聚偏二氟乙烯，陶瓷中的至少一种。隔膜可以是单层薄膜，也可以是多层复合薄膜，没有特别限制。在隔膜为多层复合薄膜时，各层的材料可以相同或不同，没有特别限制。隔离件可以是单独的一个部件位于正负极之间，也可以附着在正负极的表面。
在一些实施方式中，隔离件为固态电解质。固态电解质设于正极和负极之间，同时起到传输离子和隔离正负极的作用。
在一些实施方式中，电极组件为卷绕结构。正极极片、负极极片卷绕成卷绕结构。
目前，从市场形势的发展来看，电池已被广泛应用于电动自行车、电动摩托车、电动汽车等电动交通工具，以及电动工具、无人机、储能设备等多个领域。随着电池用领域的不断扩大，其市场的需求量也在不断地扩增。
电池技术的发展要同时考虑多方面的设计因素，例如，能量密度、循环寿命、放电容量、充放电倍率等性能参数，另外，随着环境条件和/或电池内部条件的改变，电池的可靠性问题也是重点考虑的因素之一。
目前，通常是通过卷针将电极组件卷绕成型，卷针的卷针本体上设置有容纳夹针的凹槽。卷绕成型之后，将两个夹针容置于凹槽并将卷针从电极组件上抽离，将两个夹针沿水平方向彼此远离，以将卷绕成型的电极组件拉伸。
在拉伸的过程中，电极组件在水平方向上被拉伸，与此对应的，电极组件在竖直方向上相对的上半部分和下半部分会彼此靠近，形成上半部分的电极组件下降，下半部分的电极组件上升的趋势。然而，由于重力的作用下，上半部分的电极组件往往下降的速度较快，容易导致上半部分的电极组件直接塌陷，从而导致上半部分的电极组件打皱，当极耳位于上半部分时，极耳还会由于上半部分的电极组件塌陷导致翻折，在后续的充放电过程中可能存在析锂的风险，影响了电池单体的可靠性，从而影响了电池的可靠性。
基于上述考虑，为了降低电极组件拉伸过程中上半部分塌陷打皱或极耳发生翻折的风险、导致电池单体和电池的可靠性差的问题，本申请实施例提供了一种卷针，包括卷针本体，卷针本体的外周面上设置有一对第一凹槽和第二凹槽，一对第一凹槽沿卷针本体的周向间隔设置，第二凹槽与第一凹槽沿卷针本体的周向间隔设置。第一凹槽用于容置第一夹针，第二凹槽用于容置第二卷针。
通过设置第一凹槽和第二凹槽，第一凹槽容置第一夹针，第二凹槽容置第二卷针，在电极组件的拉伸工序中，通过第二凹槽确定位置的第二夹针，与电极组件的上半部分抵接，降低上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件析锂的风险，提高了电 池单体的可靠性，从而提高了电池的可靠性。
本申请实施例公开的电池可以但不限用于车辆、船舶或飞行器等用电设备中。可以使用具备本申请公开的电池组成该用电设备的电源系统。
本申请实施例提供一种使用电池作为电源的用电设备，用电设备可以为但不限于手机、平板电脑、笔记本电脑、电动玩具、电动工具、电动自行车、电动摩托车、电动汽车、轮船、航天器等等。其中，电动玩具可以包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等，航天器可以包括飞机、火箭、航天飞机和宇宙飞船等等。
以下实施例为了方便说明，以本申请一实施例的一种用电设备为车辆1000为例进行说明。
请参照图1，图1为本申请一些实施例提供的车辆1000的结构示意图。车辆1000可以为燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等。车辆1000的内部设置有电池300，电池300可以设置在车辆1000的底部或头部或尾部。电池300可以用于车辆1000的供电，例如，电池300可以作为车辆1000的操作电源，用于车辆1000的电路系统，例如用于车辆1000的启动、导航和运行时的工作用电需求。
车辆1000还可以包括控制器1100和马达1200，控制器1100用来控制电池300为马达1200供电，例如，用于车辆1000的启动、导航和行驶时的工作用电需求。
在本申请一些实施例中，电池300不仅可以作为车辆1000的操作电源，还可以作为车辆1000的驱动电源，代替或部分地代替燃油或天然气为车辆1000提供驱动动力。
请参照图2，图2为本申请一些实施例提供的电池300的爆炸图。电池300还可以包括箱体310，电池单体200容纳于箱体310内。其中，箱体310用于为电池单体200提供容纳空间，箱体310可以采用多种结构。在一些实施例中，箱体310可以包括第一子箱体311和第二子箱体312，第一子箱体311与第二子箱体312相互盖合，第一子箱体311和第二子箱体312共同限定出用于容纳电池单体200的容纳空间。第二子箱体312可以为一端开口的空心结构，第一子箱体311可以为板状结构，第一子箱体311盖合于第二子箱体312的开口侧，以使第一子箱体311与第二子箱体312共同限定出容纳空间；第一子箱体311和第二子箱体312也可以是均为一侧开口的空心结构，第一子箱体311的开口侧盖合于第二子箱体312的开口侧。
在电池300中，电池单体200可以是多个，多个电池单体200之间可串联或并联或混联，混联是指多个电池单体200中既有串联又有并联。多个电池单体200之间可直接串联或并联或混联在一起，再将多个电池单体200构成的整体容纳于箱体310内；当然，电池300也可以是多个电池单体200先串联或并联或混联组成电池300模块形式，多个电池300模块再串联或并联或混联形成一个整体，并容纳于箱体310内。电池300还可以包括其他结构，例如，该电池300还可以包括汇流部件，用于实现多个电池单体200之间的电连接。
其中，电池单体200可以为二次电池300或一次电池300；电池单体200还可以是锂硫电池300、钠离子电池300或镁离子电池300，但不局限于此。
请参照图3，图3为本申请一些实施例提供的电池单体200的爆炸图。如图3所示，电池单体200包括外壳210、电极组件100及电极端子220。外壳210包括壳体211和端盖212，壳体211具有开口，端盖212封闭开口，以将电池单体200的内部环境与外部环境隔绝。
壳体211是用于配合端盖212以形成电池单体200的内部环境的组件，其中，形成的内部环境可以用于容纳电极组件100、电解液以及其他部件。壳体211和端盖212可以是独立的部件。壳体211可以是多种形状和多种尺寸的。具体地，壳体211的形状可以根据电极组件100的具体形状和尺寸大小来确定。壳体211的材质可以是多种，比如，铜、铁、铝、不锈钢、铝合金、塑胶等。
端盖212是指盖合于壳体211的开口处以将电池单体200的内部环境隔绝于外部环境的部件。不限地，端盖212的形状可以与壳体211的形状相适应以配合壳体211。可选地，端盖212可以由具有一定硬度和强度的材质(如铝合金)制成，这样，端盖212在受挤压碰撞时就不易发生形变，使电池单体200能够具备更高的结构强度，可靠性也可以有所提高。端盖212上可以设置有如电极端子等的功能性部件。电极端子可以用于与电极组件100电连接，以用于输出或输入电池单体200的电能。端盖212的材质也可以是多种的，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本申请实施例对此不作特殊限制。在一些实施例中，在端盖212的内侧还可以设置有绝缘结构，绝缘结构可以用于隔离壳体211内的电连接部件与端盖212，以降低短路的风险。示例性的，绝缘结 构可以是塑料、橡胶等。
请参照图4，图4为本申请一些实施例提供的电极组件的结构示意图。如图所示，电极组件100是电池单体200中发生电化学反应的部件。壳体211内可以包含一个或更多个电极组件100。电极组件100主要由正极极片110和负极极片120卷绕或层叠放置形成，并且通常在正极极片110与负极极片120之间设有隔膜130，隔膜130用于分隔正极极片110和负极极片120，以降低正极极片110和负极极片120内接短路的风险。正极极片110和负极极片120具有活性物质的部分构成电极组件100的主体部，正极极片110和负极极片120不具有活性物质的部分各自构成极耳。正极极耳和负极极耳可以共同位于主体部的一端或是分别位于主体部的两端。在电池300的充放电过程中，正极活性物质和负极活性物质与电解液发生反应，极耳连接电极端子以形成电流回路。
请参照图5至图11，图5为本申请一些实施例提供的卷针的结构示意图，图6为图5中卷针的另一视角的结构示意图，图7为本申请另一些实施例提供的卷针的结构示意图，图8为图7中卷针的另一视角的结构示意图，图9为本申请又一些实施例提供的卷针的结构示意图，图10为图9中卷针的另一视角的结构示意图，图11为本申请一些实施例提供的卷绕装置的结构示意图。如图所示，本申请实施例提供了一种卷针1，包括卷针本体2，卷针本体2的外周面上设置有一对第一凹槽3，第一凹槽3用于容置第一夹针11，一对第一凹槽3沿卷针本体2的周向间隔设置；其中，卷针本体2的外周面上还设置有至少一个第二凹槽4，第二凹槽4用于容置第二夹针12，第二凹槽4与第一凹槽3沿卷针本体2的周向间隔设置。
在一些实施例中，卷针1用于将正极极片110、负极极片120和隔膜130卷绕成型电极组件100，其中电极组件100可以卷绕于卷针本体2的外周面。
在一些实施例中，卷针本体2可以为回转体，回转体可以为圆柱体，卷针本体2卷绕成型的电极组件100，在卷针本体2的轴向上的截面为中空的环形，其电极组件100包括内圈和外圈。
在一些实施例中，在卷针1卷绕成型电极组件100时，卷针本体2的设置方式可以为：将卷针本体2的外周面水平设置，使得卷针本体2的轴向位于水平方向。以卷针本体2的轴向为观察方向，一对第一凹槽3位于水平方向上，在竖直方向上，第二凹槽4位于一对第一凹槽3连线的上方。
在卷针本体2的外周面卷绕成型电极组件100之后，将一对第一夹针11分别插入一对第一凹槽3，将第二夹针12插入第二凹槽4。在将卷针本体2从电极组件100中取出之后，将一对第一夹针11沿水平方向彼此远离，与电极组件100的内圈抵接，并将电极组件100沿水平方向拉伸。
与此同时，电极组件100的上半部分和下半部分，上半部分也即竖直方向上位于一对第一夹针11连线的上方部分的电极组件100，下半部分也即竖直方向上位于一对第一夹针11连线的下方部分的电极组件100，电极组件100的上半部分和下半部分在竖直方向上互相靠近，由于重力作用，电极组件100的上半部分下降的速度会大于电极组件100的下半部分的上升速度，通过第二夹针12抵接电极组件100的上半部分，以降低上半部分的下降速度。
在一些实施例中，第二凹槽4的数量可以为一个。
在一些实施例中，第二凹槽4的数量可以为多个。
在一些实施例中，第二凹槽4和第二夹针12可以一一对应设置。
本申请实施例的技术方案，在卷针本体2的外周面上设置一对周向间隔的第一凹槽3以及区别于第一凹槽3的第二凹槽4，在使用时，将一对第一凹槽3设置于竖直方向的两侧，将第二凹槽4设置于一对第一凹槽3连线的上方，通过卷针本体2的外周面卷绕成型电极组件100，通过第一凹槽3容置第一夹针11，通过第二凹槽4容置第二夹针12，从而确定第一夹针11和第二夹针12的位置，在后续电极组件100的拉伸工序中，通过第二凹槽4确定位置的第二夹针12，与电极组件100的上半部分抵接，降低上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件100析锂的风险，提高了电池单体200的可靠性，从而提高了电池300的可靠性。
请参照图5至图11。在一些实施例中，一对第一凹槽3沿卷针本体2的周向间隔180°设置。
在一些实施例中，可以将一对第一凹槽3沿卷针本体2的周向间隔180°设置，在设置卷针本体2时，使得一对第一凹槽3位于同一水平面上，且一对第一凹槽3位于卷针本体2的两端， 一对第一夹针11分别对应容置于一对第一凹槽3内，第一夹针11在水平方向上彼此远离，也即一对第一夹针11分别抵接卷绕成型的电极组件100的两个内圈壁面，该两个内圈壁面为电极组件100在水平方向上的直径所对应的两个内圈壁面。
在一些实施例中，一对第一凹槽3沿卷针本体2的周向间隔180°设置，也即，以卷针本体2的轴向为观察方向，在卷针本体2的轴向上的表面上，一对第一凹槽3能够设置于同一水平面上。
在一些实施例中，由于加工的误差等原因，一对第一凹槽3沿卷针本体2的周向间隔设置的角度还可以为170°至180°之间，例如可以为170°、171°、172°、173°、174°、175°、176°、177°、178°、179°、180°等。当一对第一凹槽3之间的角度设定受到加工误差影响时，在设置一对第一凹槽3时，以卷针本体2的轴向为观察方向，在卷针本体2的轴向上的表面上，将一对凹槽设置为相对于电极组件100在竖直方向上的直径对称。
本申请实施例的技术方案，将一对第一凹槽3间隔180°设置于卷针本体2的外周面上，其中通过卷针本体2的外周面卷绕成型电极组件100，且将一对第一凹槽3设置于竖直方向的两侧，也即一对第一凹槽3位于电极组件100在水平方向的直径上，第一凹槽3用于容置第一夹针11，在后续电极组件100的拉伸工序中，第一夹针11沿水平方向彼此远离，能够使得电极组件100的拉伸效果最好，且能够便于第二凹槽4的设置，提高了便利性。
请参照图5至图11。在一些实施例中，在卷针本体2的周向上，第二凹槽4与其中一个第一凹槽3间隔的角度为α，满足：45°≤α≤90°。
在一些实施例中，在卷针本体2的周向上，第二凹槽4与其中一个第一凹槽3间隔的角度可以为α，此时第二凹槽4与另一个第一凹槽3间隔的角度可以为180°-α，α满足45°≤α≤90°，其中，α可以为45°、50°、55°、60°、65°、70°、75°、80°、85°、90°等。
在一些实施例中，关于角度α的大小测量方式可以为以下方式。以卷针本体2的轴向为观察方向，在卷针本体2的轴向上的表面上，以其中一个第一凹槽3为例，其中一个第一凹槽3的远离第二凹槽4的壁面的延长线，与第二凹槽4的靠近该第一凹槽3的壁面的延长线，两条延长线之间的角度为α。
本申请实施例的技术方案，第二凹槽4与其中一个第一凹槽3间隔的角度为α，而在使用时，一对第一凹槽3水平设置，第二凹槽4设置于第一凹槽3的上方，而第一凹槽3用于容置第一夹针11，第二凹槽4用于容置第二夹针12，α的大小对应第二夹针12对应于卷绕的电极组件100的位置，当45°≤α≤90°时，即第一夹针11和第二夹针12离得较远，也即第二夹针12在竖直方向上的高度较高，第二夹针12抵接的上半部分的部分距离电极组件100最上端较近，偏离电极组件100最上端的角度较小，第二夹针12与电极组件100的上半部分抵接，降低了电极组件100的上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件100析锂的风险，提高了电池单体200的可靠性，从而提高了电池300的可靠性。
在一些实施例中，60°≤α≤90°。
在一些实施例中，第二凹槽4与其中一个第一凹槽3间隔的角度可以为α，此时第二凹槽4与另一个第一凹槽3间隔的角度可以为180°-α，α满足60°≤α≤90°，其中，α可以为60°、65°、70°、75°、80°、85°、90°等。
本申请实施例的技术方案，当60°≤α≤90°时，即第一夹针11和一第二夹针12离得更远，第二夹针12更靠近电极组件100的最上端，偏离电极组件100最上端的角度较小，第二夹针12与电极组件100的上半部分抵接，降低了电极组件100的上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件100析锂的风险，提高了电池单体200的可靠性，从而提高了电池300的可靠性。
在一些实施例中，85°≤α≤90°。
在一些实施例中，第二凹槽4与其中一个第一凹槽3间隔的角度可以为α，此时第二凹槽4与另一个第一凹槽3间隔的角度可以为180°-α，α满足85°≤α≤90°，其中，α可以为85°、86°、87°、88°、89°、90°等。
在一些实施例中，第二凹槽4的数量可以为一个，α可以为90°。
本申请实施例的技术方案，当85°≤α≤90°时，即第二夹针12与电极组件100的最上端抵接，由于定位误差或者是工艺原因偏离电极组件100最上端，第二夹针12与电极组件100的上半部分抵接，降低了电极组件100的上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件100析锂的风险，提高了电池单体200的可靠性，从而提高了电池300的可靠性。
请参照图8。在一些实施例中，卷针本体2的外周面由一对第一凹槽3分为第一区域5和第二区域6，第二凹槽4为多个，多个第二凹槽4均设置于第一区域5。
在一些实施例中，第一区域5和第二区域6没有特别的区分标识，第二凹槽4设置的区域可以为第一区域5。
在一些实施例中，多个第二凹槽4也可以全设置于第二区域6，第一区域5不设置第二凹槽4。
本申请实施例的技术方案，由于在重力作用下，只有电极组件100的上半部分会由于下降过快导致上半部分塌陷从而导致上半部分的极片或者极耳打皱，也即只有电极组件100的上半部分需要抵接支撑。通过一对第一凹槽3将卷针本体2的外周面分为第一区域5和第二区域6，且多个第二凹槽4均设置于第一区域5，同时在使用时将一对第一凹槽3设置于水平方向，且将第一区域5的第二凹槽4设置于一对第一凹槽3的上方，第二凹槽4用于容置第二夹针12，通过第二夹针12抵接电极组件100的上半部分，降低了电极组件100的上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件100析锂的风险，提高了电池单体200的可靠性，从而提高了电池300的可靠性。通过将第二凹槽4设置于第一区域5，而在使用时将第一区域5设置于第一凹槽3的上方，降低了设置第二夹针12时将第二夹针12设置于第一凹槽3的下方的概率，同时也节约了成本，提高了安装的便利性。
请参照图5至图11。在一些实施例中，一对第一凹槽3相对于第一平面7对称设置，卷针本体2的中心轴线位于第一平面7上，第二凹槽4为多个，多个第二凹槽4相对于第一平面7对称设置。
请参照图9至图10。在一些实施例中，第二凹槽4的数量可以为偶数个，将卷针本体2的外周面水平设置，使得卷针本体2的轴向位于水平方向。以卷针本体2的轴向为观察方向，一对第一凹槽3位于水平方向上，相对于第一平面7对称设置，偶数个的第二凹槽4均位于一对第一凹槽3的上方，且偶数个的第二凹槽4相对于第一平面7对称设置。
请参照图7至图8。在一些实施例中，第二凹槽4的数量可以为大于一个的奇数个，将卷针本体2的外周面水平设置，使得卷针本体2的轴向位于水平方向。以卷针本体2的轴向为观察方向，一对第一凹槽3位于水平方向上，相对于第一平面7对称设置，偶数个的第二凹槽4均位于一对第一凹槽3的上方，可以有一个第二凹槽4设置于第一平面7上，剩余的偶数个的第二凹槽4相对于第一平面7对称设置。
本申请实施例的技术方案，通过将多个第二凹槽4相对于第一平面7对称设置，且卷针本体2的中心轴线位于第一平面7上，也即在使用时，将一对第一凹槽3设置于水平方向，通过卷针本体2的外周面卷绕成型电极组件100，第二凹槽4相对于电极组件100在竖直方向上的直径对称设置，第二夹针12容置于第二凹槽4，从而使得多个第二夹针12分别抵接电极组件100相对于竖直方向上的直径两侧的部分，使得位于电极组件100相对于竖直方向上的直径两侧的第二夹针12的抵接效果对称，降低了电极组件100的上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件100析锂的风险，提高了电池单体200的可靠性，从而提高了电池300的可靠性。
请参照图5至图11。在一些实施例中，第一凹槽3和第二凹槽4均沿卷针本体2的轴向贯穿卷针本体2。
在一些实施例中，第一夹针11可以容置于第一凹槽3内，第二夹针12可以容置于第二 凹槽4内，第一夹针11的长度可以大于第一凹槽3在卷针本体2的轴向上的长度，第二夹针12的长度可以大于第二凹槽4在卷针本体2的轴向上的长度。
在一些实施例中，第一凹槽3和第二凹槽4均沿卷针本体2的轴向贯穿卷针本体2。第一夹针11可以容置于第一凹槽3，第一夹针11的两端可以均穿出第一凹槽3，第一夹针11也可以是一端穿出第一凹槽3，另一端容置于第一凹槽3；第二夹针12可以容置于第二凹槽4，第二夹针12的两端可以均穿出第二凹槽4，第二夹针12也可以是一端穿出第二凹槽4，另一端容置于第二凹槽4。
在一些实施例中，第一凹槽3和第二凹槽4可以沿卷针本体2的轴向不贯穿卷针本体2。第一夹针11的一端可以与第一凹槽3在卷针本体2的轴向上的壁面抵接，另一端穿出第一凹槽3；第二夹针12的一端可以与第二凹槽4在卷针本体2的轴向上的壁面抵接，另一端穿出第二凹槽4。
本申请实施例的技术方案，第一凹槽3和第二凹槽4沿卷针本体2的轴向延伸且贯穿卷针本体2，第一凹槽3用于容置第一夹针11，第二凹槽4用于容置第二夹针12，提高了第一夹针11和第二夹针12在安装过程的便利性，通过确定第一凹槽3和第二凹槽4的位置，以此来确定第一夹针11和第二夹针12的位置，提高了安装第一夹针11和第二夹针12位置的准确性，同时也便于卷针1的抽离，降低了抽离过程中卷针1与第一夹针11和第二夹针12干涉的风险。
请参照图5至图11。在一些实施例中，卷针本体2包括第一卷针部8和第二卷针部9，第一卷针部8与第二卷针部9之间限定出间隙，第二凹槽4和其中一个第一凹槽3设置于第一卷针部8的外周面上，另一个第一凹槽3设置于第二卷针部9的外周面上。
本申请实施例的技术方案，通过第一卷针部8和第二卷针部9组成卷针本体2，且第一卷针部8和第二卷针部9限定出间隙，其中一个第一凹槽3设置于第一卷针部8，另一个第一凹槽3设置于第二卷针部9，以此在使用卷针1时，可以通过移动第一卷针部8和第二卷针部9，改变间隙的大小从而改变第一卷针部8和第二卷针部9的相对位置，以此实现一对第一凹槽3在设置时的微调，通过第一凹槽3容置第一夹针11，提高了第一夹针11安装位置的准确性，从而提高了电极组件100拉伸的效果，提高了电极组件100的可靠性，提高了电池单体200和电池300的可靠性。
请参照图11至图18。图12为图11中卷绕装置的另一视角的结构示意图，图13至图17为本申请卷绕方法的过程示意图，图18为图11中卷绕装置的第一驱动件和第二驱动件的结构示意图，图19为本申请一些实施例的卷绕方法的流程图。如图所示，第二方面，本申请还提供一种卷绕装置10，用于卷绕成型电极组件100，包括如第一方面实施例中任一实施例的卷针1、一对第一夹针11和至少一个第二夹针12，一对第一夹针11被配置为，在卷针1抽离电极组件100后，向彼此远离的方向移动，以将电极组件100撑开，第二夹针12被配置为，在一对第一夹针11撑开电极组件100的过程中，对电极组件100的上半部分进行支撑。
请参照图5至图6。在一些实施例中，卷针1包括卷针本体2，在卷针本体2的外周面上，可以沿卷针本体2的周向间隔180°设置一对第一凹槽3，在外周面上另设置一个第二凹槽4。请参照图13，在卷针本体2的外周面上将电极组件100卷绕成型，请参照图14，将一对第一夹针11分别容置于一对第一凹槽3内，将第二夹针12容置于第二凹槽4，将卷针1抽离出电极组件100。以卷针本体2的轴向为观察方向，此时一对第一夹针11位于同一水平方向上，第二夹针12位于第一夹针11的上方且位于第一平面7上。请参照图15至图17，将一对第一夹针11在水平方向上彼此远离，一对第一夹针11分别与电极组件100水平方向上的内径对应的内圈部分抵接，将电极组件100沿水平方向拉伸，第二夹针12与电极组件100竖直方向上的内径对应的内圈部分抵接，对电极组件100的上半部分进行支撑，以降低在拉伸过程中上半部分的下降速度。
本申请实施例的技术方案，将第一夹针11设置于第一凹槽3，将第二夹针12设置于第二凹槽4，卷针1将电极组件100卷绕成型之后取出，两个第一夹针11在水平方向上向彼此远离的方向移动，与电极组件100在水平方向上相对的两个内壁抵接，以将电极组件100沿水平方向拉伸，此时电极组件100在竖直方向上相对的两个内壁相互靠近，其中第二夹针12与电极组件100的上半部分抵接，降低上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件100析锂的风险，提高了电池单体200的可靠性，从而提高了电池300的可靠性。
请参照图13，在一些实施例中，第二夹针12具有远离卷针本体2的中心轴线的第一壁 面13，第一壁面13构造为弧面。
在一些实施例中，在第二夹针12容置于第二凹槽4时，远离卷针本体2的中心轴向的壁面为第一壁面13，其中，第一壁面13可以为弧面，弧面可以向远离卷针本体2的中心轴向凸出。
本申请实施例的技术方案，通过第二夹针12抵接电极组件100的上半部分，且第二夹针12具有远离卷针本体2的中心轴线的第一壁面13，抵接电极组件100的上半部分的第一壁面13为弧面，由于卷绕之后的电极组件100为环形，电极组件100的内壁为弧面，因此将第一壁面13构造为弧面，能够使得第二夹针12抵接电极组件100的上半部分时更加平滑，降低了损坏电极组件100的风险，从而提高电池300的可靠性。
请参照图15，在一些实施例中，卷绕装置10还包括加热件14，加热件14与第二夹针12连接以为第二夹针12加热。
在一些实施例中，加热件14可以与第二夹针12直接接触，实现热传导。
在一些实施例中，加热件14可以与第二夹针12不直接接触，只需要形成能够进行热交换的导热连接即可。
本申请实施例的技术方案，通过设置加热件14与第二夹针12连接用于为第二夹针12加热，其中第二夹针12用于抵接电极组件100的上半部分，上半部分包括正极片、负极片以及用于粘接正负极片的隔膜130，第二夹针12加热使得上半部分中隔膜130的粘合剂熔化，从而使得与隔膜130与正负极片的粘合更加牢固，降低了极片打皱的风险，提高了电极组件100的可靠性，从而提高了电池300的可靠性。
在一些实施例中，加热件14为电阻元件。
本申请实施例的技术方案，将加热件14设置为电阻元件，易于获得且容易实现加热效果，提高了加热的便利性。
请参照图18，在一些实施例中，卷绕装置10还包括第一驱动件15和第二驱动件16，第一驱动件15与一对第一夹针11连接以驱动一对第一夹针11沿第一方向X远离彼此，第二驱动件16与第二夹针12连接以驱动第二夹针12沿第二方向Y移动，其中，第一方向X和第二方向Y相交。
在一些实施例中，第一驱动件15可以包括两个驱动臂，两个驱动臂分别与一对第一夹针11连接，并带动一对第一夹针11沿第一方向X远离彼此，第二驱动件16与第二夹针12连接带动第二夹针12沿第二方向Y移动。需要说明的是，以卷针本体2的轴向为观察方向，第一方向X可以为水平方向，第二方向Y可以为竖直方向。也即，第一驱动件15带动一对第一夹针11沿水平方向彼此远离，第二驱动件16带动第二夹针12沿竖直方向向下移动，直至一对第一夹针11和第二夹针12位于同一水平方向。
如图所示，第一方向X可以用X表示，第二方向Y可以用Y表示。
本申请实施例的技术方案，通过设置第一驱动件15与第一夹针11连接从而驱动一对第一夹针11沿第一方向X远离彼此，设置第二驱动件16驱动第二夹针12沿第二方向Y向下移动，使得两个第一夹针11沿第一方向X相互远离，与电极组件100在第一方向X上相对的两个内壁抵接，以将电极组件100沿第一方向X拉伸，使得第二夹针12在第二方向Y上向下移动，且在移动过程中与电极组件100的上半部分抵接，降低上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件100析锂的风险，提高了电池单体200的可靠性，从而提高了电池300的可靠性。此外，通过机械化驱动，便于控制第一夹针11和第二夹针12的速度，也提高了操作的便利性。
第三方面，本申请实施例还提供一种电池300制造设备，包括如第二方面实施例中任一实施例的卷绕装置10。
本申请实施例的技术方案，通过卷绕装置10完成电极组件100的卷绕成型，再通过电池300制造设备制造电池300或者电池单体200。其中，卷绕装置10包括卷针1、第一夹针11和第二夹针12，将第一夹针11设置于卷针1的第一凹槽3，将第二夹针12设置于卷针1的第二凹槽4，卷针1将电极组件100卷绕成型之后取出，两个第一夹针11在水平方向上向彼此远离的方向移动，与电极组件100在水平方向上相对的两个内壁抵接，以将电极组件100沿水平方向拉伸，此时电极 组件100在竖直方向上相对的两个内壁相互靠近，其中第二夹针12与电极组件100的上半部分抵接，降低上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件100析锂的风险，提高了电池单体200的可靠性，从而提高了电池300的可靠性。
请参照图5至图19，图19为本申请一些实施例的卷绕方法的流程图。如图所示，第四方面，本申请实施例还提供一种卷绕方法，包括：S100提供如第一方面实施例中任一实施例的卷针1。请参照图13，S200卷针1卷绕极片和隔膜130形成电极组件100。请参照图14，S300将一对第一夹针11插入一对第一凹槽3中，将第二夹针12插入第二凹槽4中。请参照图15，S400将卷针1从电极组件100抽离。请参照图16至图17，S500将一对第一夹针11向彼此远离的方向移动，以将电极组件100撑开。S600在将电极组件100撑开的过程中，通过第二夹针12支撑电极组件100的上半部分。
本申请实施例的技术方案，通过提供的卷针1将正负极片和隔膜130卷绕成型形成电极组件100，再将第一夹针11插入卷针1的第一凹槽3，将第二夹针12插入卷针1的第二凹槽4，组成卷绕装置10，然后将卷针1从电极组件100中抽离，从而使得第一夹针11和第二夹针12能够移动，此时将一对第一夹针11向彼此远离的方向移动，与电极组件100相对的两个内壁抵接的同时撑开电极组件100，以实现电极组件100的拉伸，同时第二夹针12支撑电极组件100的上半部分，降低上半部分的下降速度，降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件100析锂的风险，提高了电池单体200的可靠性，从而提高了电池300的可靠性。
在一些实施例中，通过第二夹针12支撑电极组件100的上半部分，以使上半部分与第二夹针12接触区域的移动速度，小于或等于电极组件100的下半部分与第二夹针12正对的区域的移动速度。
本申请实施例的技术方案，通过第二夹针12支撑电极组件100的上半部分，降低上半部分的下降速度，使得上半部分与第二夹针12接触区域的移动速度，小于或者等于电极组件100的下半部分与第二夹针12正对的区域的移动速度，通过速度的比较，从而确认第二夹针12降低了上半部分由于重力作用下降过快导致上半部分塌陷从而导致打皱的风险，同时也降低了极耳位于上半部分时极耳发生翻折的概率，从而降低了电极组件100析锂的风险，提高了电池单体200的可靠性，从而提高了电池300的可靠性。
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 (17)

  1. 一种卷针，其特征在于，包括卷针本体，所述卷针本体的外周面上设置有一对第一凹槽，所述第一凹槽用于容置第一夹针，所述一对第一凹槽沿所述卷针本体的周向间隔设置；
    其中，所述卷针本体的外周面上还设置有至少一个第二凹槽，所述第二凹槽用于容置第二夹针，所述第二凹槽与所述第一凹槽沿所述卷针本体的周向间隔设置。
  2. 根据权利要求1所述的卷针，其特征在于，所述一对第一凹槽沿所述卷针本体的周向间隔180°设置。
  3. 根据权利要求1至2中任一项所述的卷针，其特征在于，在所述卷针本体的周向上，所述第二凹槽与其中一个所述第一凹槽间隔的角度为α，满足：45°≤α≤90°。
  4. 根据权利要求3所述的卷针，其特征在于，60°≤α≤90°。
  5. 根据权利要求3至4中任一项所述的卷针，其特征在于，85°≤α≤90°。
  6. 根据权利要求1至5中任一项所述的卷针，其特征在于，所述卷针本体的外周面由所述一对第一凹槽分为第一区域和第二区域，所述第二凹槽为多个，多个所述第二凹槽均设置于所述第一区域。
  7. 根据权利要求1至6中任一项所述的卷针，其特征在于，所述一对第一凹槽相对于第一平面对称设置，所述卷针本体的中心轴线位于所述第一平面上，所述第二凹槽为多个，多个所述第二凹槽相对于所述第一平面对称设置。
  8. 根据权利要求1至7中任一项所述的卷针，其特征在于，所述第一凹槽和所述第二凹槽均沿所述卷针本体的轴向贯穿所述卷针本体。
  9. 根据权利要求1至8中任一项所述的卷针，其特征在于，所述卷针本体包括第一卷针部和第二卷针部，所述第一卷针部与所述第二卷针部之间限定出间隙，所述第二凹槽和其中一个所述第一凹槽设置于所述第一卷针部的外周面上，另一个所述第一凹槽设置于所述第二卷针部的外周面上。
  10. 一种卷绕装置，用于卷绕成型电极组件，其特征在于，包括：
    如权利要求1至9中任一项所述的卷针；
    一对第一夹针，所述一对第一夹针被配置为，在所述卷针抽离所述电极组件后，向彼此远离的方向移动，以将所述电极组件撑开；
    至少一个第二夹针，所述第二夹针被配置为，在所述一对第一夹针撑开所述电极组件的过程中，对所述电极组件的上半部分进行支撑。
  11. 根据权利要求10所述的卷绕装置，其特征在于，所述第二夹针具有远离所述卷针本体的中心轴线的第一壁面，所述第一壁面构造为弧面。
  12. 根据权利要求10至11中任一项所述的卷绕装置，其特征在于，所述卷绕装置还包括加热件，所述加热件与所述第二夹针连接以为所述第二夹针加热。
  13. 根据权利要求12所述的卷绕装置，其特征在于，所述加热件为电阻元件。
  14. 根据权利要求10至13中任一项所述的卷绕装置，其特征在于，所述卷绕装置还包括第一驱动件和第二驱动件，所述第一驱动件与所述一对第一夹针连接以驱动所述一对第一夹针沿第一方向远离彼此，所述第二驱动件与所述第二夹针连接以驱动所述第二夹针沿第二方向移动，其中，所述第一方向和所述第二方向相交。
  15. 一种电池制造设备，其特征在于，包括如权利要求10至14中任一项所述的卷绕装置。
  16. 一种卷绕方法，其特征在于，包括：
    提供如权利要求1至9中任一项所述的卷针；
    所述卷针卷绕极片和隔膜形成电极组件；
    将一对第一夹针插入所述一对第一凹槽中，将第二夹针插入所述第二凹槽中；
    将所述卷针从所述电极组件抽离；
    将所述一对第一夹针向彼此远离的方向移动，以将所述电极组件撑开；在将所述电极组件撑开的过程中，通过所述第二夹针支撑所述电极组件的上半部分。
  17. 根据权利要求16所述的卷绕方法，其特征在于，通过所述第二夹针支撑所述电极组件的上半部分，以使所述上半部分与所述第二夹针接触区域的移动速度，小于或等于所述电极组件的下半部分与所述第二夹针正对的区域的移动速度。
PCT/CN2024/084027 2023-07-03 2024-03-27 卷针、卷绕装置、电池制造设备及卷绕方法 Ceased WO2025007599A1 (zh)

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