WO2023237331A1 - Dispositif et procédé de fabrication d'un élément d'énergie enroulé présentant une butée d'enroulement - Google Patents

Dispositif et procédé de fabrication d'un élément d'énergie enroulé présentant une butée d'enroulement Download PDF

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Publication number
WO2023237331A1
WO2023237331A1 PCT/EP2023/063817 EP2023063817W WO2023237331A1 WO 2023237331 A1 WO2023237331 A1 WO 2023237331A1 EP 2023063817 W EP2023063817 W EP 2023063817W WO 2023237331 A1 WO2023237331 A1 WO 2023237331A1
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WO
WIPO (PCT)
Prior art keywords
winding
material webs
material web
channel
webs
Prior art date
Application number
PCT/EP2023/063817
Other languages
German (de)
English (en)
Inventor
Manfred Folger
Michael Kleine Wächter
Jan Kreysern
Daniel Diedrich
Marcus Wagner
Karsten Meinke
Nils Hofmann
Torsten Mörke
Original Assignee
Körber Technologies Gmbh
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 Körber Technologies Gmbh filed Critical Körber Technologies Gmbh
Publication of WO2023237331A1 publication Critical patent/WO2023237331A1/fr

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Classifications

    • 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

Definitions

  • the invention relates to a device for producing wound energy cells from at least two material webs arranged one above the other, comprising at least one feed device for feeding the material webs, a transport device for at least partially transporting the material webs in the transport direction along a transport section through the device, the transport device comprising at least one transport element , and a winding device for winding the material webs into a wound material web roll in a winding station comprising the winding device.
  • the invention relates to a method for producing wound energy cells from at least two material webs arranged one above the other, comprising the steps of feeding the material webs by means of at least one feed device, at least partially transporting the material webs in the transport direction along a transport section by means of a transport device comprising a transport element, and winding the material webs to a wound roll of material webs by means of a winding device comprising a winding station.
  • Energy cells or energy storage devices in the sense of the invention are used, for example, in motor vehicles, other land vehicles, ships, aircraft or in stationary systems such as photovoltaic systems in the form of battery cells or fuel cells, in which very large amounts of energy have to be stored over long periods of time.
  • energy cells regularly have a winding of material webs, which serve as starting materials for such energy cells.
  • winding energy cells for example round cells
  • the winding material is typically selected from four anode, cathode and separator tracks of different lengths, which are present, for example, as a film or generally as a material web.
  • the material webs are usually fed separately to a winding core along different paths.
  • the material webs for example, four separate feeds are required, each to provide a material web in order to then wind it together around a winding core.
  • the material webs are regularly pre-cut to the desired width and/or length in an upstream manufacturing process.
  • the material webs with the anodes and cathodes are cut, for example, from an endless web and then wound up with an endless web of separator material in the final winding process.
  • the material webs must regularly have a specific width and length so that an accurately wound energy cell with the intended dimensions can be formed.
  • the supply of material webs to the winding core cannot take place continuously in the known devices and methods, since the material webs are fed to a quasi-stationary, central winding core.
  • This winding core can usually only be rotated about its longitudinal axis or is rotated about its longitudinal axis in order to wind up the material webs to form an energy cell or wound material webs.
  • the winding core must be removed again from the energy cell or the wound material webs (material web winding) before the winding process of the energy cell or the material web winding in the winding station is completed.
  • damage or loss of quality to the material webs or the energy cell or the material web roll can occur, which can lead to safety risks or damage to the installed energy storage device.
  • the material webs must be fed one after the other to the central, quasi-stationary winding core, with the fastest possible production speeds being provided.
  • the material webs usually consist of very thin, flat webs, which tend to lose quality, particularly in the event of compression and torsional stress, which is why there are natural limitations in transport speeds and transport guides.
  • the material webs regularly slip during the winding process, especially when the winding core is removed, which leads to rejects and loss of quality in the wound energy cells.
  • the winding device comprises a drivable rotating body and a winding counter, the rotating body and the winding counter forming and forming a winding channel arranged in the winding station for forming the material web roll. judge.
  • the device according to the invention ensures that the at least two material webs lying one above the other at least in some areas can be converted into a wound material web roll by means of the winding device, in that the material webs between the winding counter and the rotating body can be wound into a material web roll in the winding channel formed by the rotating body and the winding support.
  • the winding channel essentially corresponds to the dimensions of the material web winding during the winding process at the corresponding winding time and preferably increases in size in the transport direction.
  • the winding counter and thus the winding channel is designed and set up at least in sections opposite the circumference of the rotating body, with the winding channel widening in the transport direction. In this way, it is possible for the at least two material webs in the winding channel to be uniformly and successively wound into a material web roll by means of the rotating body by contacting the winding counter.
  • the rotating body is preferably designed and set up as a drum, roller, roller, cylinder, shaft, coil or the like, in particular essentially rotationally symmetrical.
  • the rotating body is designed and set up at least in some areas with means for applying pressure in order to form a vacuum on the circumference of the rotating body, in particular at least in some areas, in order to hold at least one of the material webs on the rotating body at least in sections and at times, in particular before the entry of the Material webs into the winding channel.
  • the winding counter can have a full-surface or a partially closed flat contact surface, which is designed and set up to contact at least one of the material webs and/or the material web roll.
  • the material of the rotating body and the winding counter is not relevant to the invention, although the materials are preferably selected to be sufficiently hard and durable in order to provide the intended winding of the material webs into material web windings. Metals are particularly suitable for this purpose, especially stainless steel.
  • the material web roll produced can then be further processed into a wound energy cell. By forming the material web roll in the winding station, the material webs are in wound in the winding channel, which ensures continuous production of material web windings and energy cells.
  • the material webs can be wound together in the winding channel by bringing the rotating body into operative connection with the winding counter.
  • the material webs to be wound can be arranged within the winding channel and can be pulled and moved together during feeding and fed together to the winding process “as one material web”. Because only a single winding channel is required, the number of feeds, transport devices and/or winding devices required during the winding process is reduced, which results in faster and more flexible production of energy cells.
  • the material webs to be wound can also be transported more flexibly and wound uniformly in the winding channel with specified parameters (diameter, number of wraps, winding speed, etc.), which means that an increased number and range of windings and geometries of the energy cells can be generated and the risk of slipping or breakage is reduced of the material webs is reduced.
  • the next winding process of the material webs can be started without delay in the winding channel of the winding station to form a new material web roll, which ensures continuous production of wound energy cells.
  • At least one winding element functioning as a winding core can preferably be provided, which can be brought into operative connection with at least one surface of one of the material webs to be wound before or during the winding process.
  • the at least two material webs can then be wound around the winding element in the winding channel in the winding channel by means of the rotating body in conjunction with the winding counter to form a material web roll.
  • a winding start or a winding element can be produced from at least one of the material webs, around which the at least two material webs can be wound in the winding channel by means of the rotating body in conjunction with the winding counter support to form a material web roll.
  • the winding counter which is preferably in operative connection with the rotating body, provides the function that the material webs or the material webs to be wound into a material web roll during the winding process are arranged at least in some areas between the winding counter and the rotating body. body can be wound into a material web roll.
  • the material webs or the material webs to be wound into a material web roll during the winding process are more preferably in operative connection/engagement with the winding counter and/or the rotating body in such a way that they are wound up around the longitudinal axis in the transport direction to form a material web roll.
  • the winding channel is preferably designed and set up to be changeable in its profile and/or to the contour (diameter, shape, number of wraps, etc.) of the material web roll to be wound, which is formed and set up by changing the winding counter and/or the rotating body. Further preferably, a change can be generated by means of a cam control of the rotating body and/or by means of an electric drive in order to control and/or regulate the contact of the material webs (or the material webs to be wound into a material web roll during the winding process) on the winding counter support to control and/or regulate the orbit of the rotating body during the winding process.
  • the winding channel can preferably be adapted to the desired contour of the material web winding in the course of the winding.
  • Such winding process systems can preferably include further means and/or elements in order to support and/or design and set up an introduction of additives and/or auxiliary materials and/or a subsequent winding.
  • the material webs are preferably endless webs and more preferably comprise at least one material web of a separator material, which is also referred to, among other things, as a separator web, separator material web or separator film. More preferably, at least one further material web is formed from an anode web or cathode web, which are also referred to as anode or cathode, anode material web or cathode material web, anode film or cathode film, etc. Preferably, the at least two material webs comprise two separator material webs.
  • the start of the winding can be produced within the winding channel from at least one separator material web, in that the material webs provided comprise at least a first section of material webs, which consist of at least a separator material web, which can be formed into a winding start by processing.
  • the separator material webs can preferably be brought into operative connection with at least one means in front of or within the winding channel, whereby the at least one separator material web can be generated to a winding start, around which the at least two material webs in the winding channel can be wound to form a material web roll.
  • the material webs comprise, in particular, two separator material webs and at least one further material web, for example an anode and/or a cathode material web.
  • the anode or cathode material web is preferably arranged between two separator material webs in order to provide the corresponding starting materials for an energy cell.
  • further materials or processing steps can preferably be added to the material web roll in order to form the energy cell.
  • lying one above the other means that the material webs are arranged one above the other at least in sections.
  • lying one above the other can therefore mean that the material webs are arranged at a distance or essentially one above the other with no gap, with a substantially congruent arrangement of the material webs being further preferably provided. If the material webs are arranged at a distance, they can preferably be transported at least partially by means of independent means of transport; if they are arranged without a distance, the material webs can preferably be transported using a single means of transport.
  • one of the material webs is arranged only for a certain section on another material web; it is preferably conceivable that an anode or cathode material web can each be arranged completely on a separator material web and/or is covered by a separator material web.
  • the inventive concept also includes devices whose width is adjusted in such a way that a plurality or plurality of material webs can be produced parallel to material web rolls at the same time.
  • Such devices according to the invention are preferably designed to be variable, particularly in terms of (machine) width. forms and set up so that several material webs can be transported next to each other or in parallel by means of the transport device. With a single device, a plurality or plurality of at least two material webs can be wound into corresponding material web rolls using the winding device.
  • a plurality of material webs are processed in parallel on a device by adjusting the width of the device components accordingly in order to provide a parallel winding in the direction of the longitudinal axis of the energy cell through a corresponding arrangement and transport in the winding channel.
  • the intended facilities, stations and the respective means must be adapted accordingly in order to provide scalability across the board.
  • a preferred embodiment is characterized in that the material webs on the rotating body can be transported at least partially along the winding channel, the material web roll being able to be formed by placing the material webs in contact with the winding counter.
  • the material webs can be transported at least in sections along the winding channel in the transport direction by the rotating body. In this way, on the one hand, the material webs are transported and, on the other hand, the material webs can be wound along the winding channel in order to produce the material web winding and thus the energy cell.
  • the material webs are preferably in contact with the rotating bodies and/or the winding counter supports during the winding process, whereby a winding of the material webs to form the material web winding is formed and set up when the rotating body rotates, which results in the material webs to be wound being advanced in the winding channel.
  • the rotating body preferably takes on a dual function in that it is designed and set up as a transport element in order to transport the material webs at least in sections along the transport section and in addition the material web roll is formed by means of the rotating body in combination with the winding counter. In this way, less material usage and fewer control and regulation processes are required, which ensures efficient and reliable production of energy cells.
  • a small number of moving and moving parts or material webs are required, which can be wound along a designated section to form the material web roll, without a material web-specific supply or control, in particular with regard to the superimposed arrangement and the source of supply, of the material webs.
  • An advantageous development is characterized in that the winding channel is expanded, expandable and/or changeable along the transport section in such a way that the material web roll can be formed with a predetermined winding during transport through the winding channel. Due to the changeability of the winding channel, the winding process can be influenced directly by changing the dynamics during winding through the design of the winding channel, in particular through its height dimensions.
  • the winding space during winding is chosen to be sufficiently large or can be selected to be sufficiently large that the diameter of the material web roll can be successively increased during the winding process by winding the material webs.
  • a change in location of the winding process can be generated within the winding channel during the winding process, whereby the winding of the material web roll to be produced is designed and set up to be variable along the winding station, for example a change in position of the material webs within the winding device in the transport direction given is.
  • the intensity of the winding can be controlled in particular by the height of the winding channel in order to form and set up a looser or a more tensioned/tighter winding on the one hand.
  • the winding channel can be changed in such a way that the prevailing space for the winding can be successively increased so that a sufficiently large area is available for at least one of the material webs during the winding process.
  • the winding channel can be reduced again in a preferred development, in particular by changing the position of the winding counter in relation to the rotating body, whereby the dimensions of the winding channel can be increased or reduced.
  • the winding counter has a stationary winding contour, with the winding channel being designed and set up depending on the winding contour and the rotating body.
  • the winding contour of the winding counter preferably corresponds at least in sections to the contour of the rotating body, with the winding contour being expandable in the course of the transport section in such a way that an expansion of the diameter of the material web winding can be formed and set up.
  • the distance between the winding counter and the rotating body can be changed, for example, by means of a cam control when the rotating body rotates, whereby the winding channel is in its position Height profile can be increased or reduced.
  • the stationary winding support can be selected depending on the rolls of material webs to be wound, in particular by selecting the winding contour to form the rolls of material webs.
  • the winding contour and the winding channel can be selected in particular depending on the thickness or length of the material web roll to be wound or the intended diameter or the intensity of the winding of the material web roll.
  • the number of winding revolutions in the winding channel is preferably known in advance from the length of the material web, which allows targeted stopping and/or transfer to another unit with a defined seam position of the last outer wrap of the material web winding.
  • the winding mat has a structured surface at least in some areas, the structured surface forming and establishing a change in state of at least one of the material webs when it engages with at least one of the material webs.
  • the change in state can be, for example, a (local) densification of the material webs and/or the generation of a local accumulation of material webs.
  • the structured surface is designed and set up when engaging with at least one of the material webs to produce a start of the winding, wherein the material webs can be wound around the start of the winding to form a wound roll of material webs.
  • the structured surface is therefore designed and set up to begin the winding process.
  • the structured surface is an area or an element of the winding channel.
  • the structured surface can be designed and set up, for example, as an elevation or as a depression, in particular as a groove or recess.
  • such a winding start can also be referred to as a winding element around which the material webs can be wound to form a material web roll.
  • the winding counter and/or the rotary body has a coated surface at least in some areas, the coated surface being provided in particular to form different sliding properties of at least one of the material webs on the winding counter and/or on the rotary body.
  • the coated surface can in particular be designed and set up to improve the sliding of at least one of the material webs and/or the material web roll, that is to say to reduce the frictional force, or to reduce the sliding of at least one of the material webs and/or the material web roll, that is to say the to increase friction force.
  • An expedient embodiment of the invention is characterized in that at least one engagement element can be arranged or arranged in the winding channel, wherein the at least one engagement element on the winding counter can be brought into operative connection with at least one of the material webs or is designed and set up to protrude into the winding channel.
  • the engagement element is designed and set up to be able to be brought with at least one of the material webs or to protrude into the winding channel, in particular to produce a winding start.
  • the engagement element represents, for example, a sectional elevation in the winding channel in order to start the winding process when at least one of the material webs engages with this engagement element.
  • the engagement element is a provided element of the winding channel, which can be brought into contact with at least one of the material webs.
  • the original transport of the material web(s) along the transport section is disrupted, as a result of which, for example, a start of winding can be generated.
  • the effect is exploited that at least one of the material webs is compressed by the engagement element, as a result of which a local accumulation of material webs occurs, which acts as the start of the winding.
  • the material webs can be wound around this beginning of the winding along the widening winding channel to form the material web winding.
  • the at least one engagement element is designed and set up to protrude into the winding channel through an opening provided on the winding support and/or an opening on the rotating body.
  • the engagement element can only be fed to the winding channel in an engagement position if necessary, for example to produce a start of the winding from at least one of the material webs.
  • the engagement element preferably remains in the rest position or can be returned to the rest position outside the winding channel in order to prevent damage or undesirable engagement with one of the material webs.
  • the engagement element is arranged in the rest position, the material webs can be transported across the opening and wound along the winding channel to form a material web roll.
  • a further expedient embodiment of the invention is characterized in that at least one winding element introduction device is arranged upstream of the winding device, which is designed and set up to have a winding element extending in the direction of the longitudinal axis of the energy cell in operative connection with at least one surface of the material webs before or with the winding of the material webs to bring the winding element to material webs to be wound.
  • the winding element can be brought into operative connection with at least one surface of the material webs to be wound around the winding element before or during the winding of the material webs, whereby the material webs do not have to be fed together to the winding process during winding, but rather the connection of the winding element with at least one surface of the material webs and the subsequent winding can take place locally separately from one another.
  • the process of winding the material webs is not tied to the provision of the winding element.
  • the rotating body can preferably provide a dual function when introducing the winding element and during winding, in that the winding element can be brought into operative connection with at least one of the material webs by means of the rotating body in order to then form and set up the winding in connection with the winding counter within the winding channel. If the winding element introduction device is separated from the winding device, the material webs provided with the winding element can preferably be wound within the winding channel by means of the rotary body provided for this purpose and the winding counter support.
  • winding elements are alternatively referred to as winding core, auxiliary core or auxiliary element.
  • the material of the winding element is not relevant to the invention and in principle all materials can be provided that enable the production/winding of an energy cell taking into account the specified set material strips enable.
  • plastics particularly preferably PE or PP
  • any other material is conceivable, such as aluminum or copper, it just has to be compatible with a cell chemistry of the energy cell that may be preferred.
  • the winding element can have positive aspects for a preferably provided liquid cell chemistry (e.g. electrolyte), in that the winding element is designed and set up, for example, as a storage medium for this purpose.
  • the winding element is preferably designed and designed to be porous. Furthermore, the winding element can provide a support function for the material webs to be wound, whereby better mechanical properties of the energy cell can be provided. In addition, it may be useful for the winding element to no longer be separated from the material web roll after winding, thereby minimizing the risk of damage or loss of quality to the energy cell.
  • the winding element is preferably applied to the topmost material web of the material webs to be wound. Alternatively, the winding element can be applied, for example, to two of the material webs.
  • the operative connection of the winding element with at least one surface is further preferably carried out by at least temporarily fixing the winding element on or with at least one of the material webs.
  • the material webs brought into operative connection with the winding element can preferably be pulled and moved and fed together to the winding process “as one material web”.
  • the winding element introduction device is designed as a winding element drum and is set up to transfer the winding element to the material webs before or at the start of the winding process.
  • more than one winding element can be provided around which the material webs can be wound to form the material web roll.
  • the operative connection of the winding element to at least one surface of the material webs is preferably irreversible, so that the winding element is firmly connected to one another with at least one material web.
  • Fixing the winding element can be advantageous, for example, for transporting the material webs within the device, a machine or a system complex.
  • Such winding process systems can preferably include further means and/or elements in order to introduce the winding element. merits and/or a subsequent winding to support and/or train and set up.
  • the device further comprises at least one cutting device which is designed and set up to cut at least one of the material webs and/or the material web roll transversely or longitudinally to the transport direction, preferably before and/or after the winding device arranged.
  • the at least one cutting device makes it possible to cut at least one or each of the material webs and/or the material web roll.
  • the cutting devices are preferably provided for cutting endless webs to length; alternatively or additionally, the cutting devices can be provided to cut the material web roll formed in a predetermined length, width and/or shape.
  • the cutting device provides a wider range of applications for the device, for example by allowing wider material webs to be cut into narrower material webs with the desired dimensions.
  • material webs can be cut according to a specified cut. More preferably, a different cutting pattern can alternatively or additionally be carried out by means of the cutting device, for example special recesses, conductor tracks or specific further cut images.
  • the cutting devices can be designed and set up, for example, by a cutting means and a counter drum.
  • the cutting means cuts the material webs guided on the counter drum with the predetermined cutting sequence or length, which is defined by the cutting process and/or the corresponding cutting means.
  • the counter drum is the rotating body.
  • the cutting device can preferably comprise a punching, laser, knife or thermal cutting device and can be designed and set up to carry out the cutting process.
  • the at least one cutting device can cut a winding element to be arranged on the at least one surface before and/or after the arrangement on the material web according to a predetermined length, width and/or shape.
  • An expedient embodiment of the invention is characterized in that the rotating body and/or the winding support is/are designed to be able to withstand temperatures and/or pressure at least in some areas and is/are set up to apply a temperature and/or pressure to the material webs or material in the winding station at least in some areas to enter the material web wrap.
  • predetermined mechanical properties can be generated in the material webs and/or in the material web wrap.
  • laminating, compressing or hardening the material webs and/or the material web roll is possible, for example in order to connect them to one another at least in some areas or to influence the mechanical properties of the end product.
  • the winding counter or the rotating body is designed and set up to be heatable and/or coolable at least in some areas.
  • the rotating body can be designed and set up to be movable, for example with an adjustable pressure against the material webs and/or against the material web winding, in order to generate a predetermined pressure within the winding channel by resting against the winding counter.
  • a device for introducing auxiliary and/or additives can be provided, for example in order to form and set up a reversible or irreversible connection of the material webs and/or the material web roll.
  • At least one delivery device designed and set up to deliver the material web rolls is arranged downstream of the winding device.
  • the delivery device takes over the rolls of material webs from the winding device or the transport device in order to enable continuous production of energy cells.
  • the dispensing device is further preferably designed and set up in such a way that it receives a roll of material web generated by the winding device or that a dispensed roll of material web can be received by the dispensing device.
  • the delivery device is preferably arranged after the winding station or the transport device, in particular after the rotating body.
  • an adhesive agent can further preferably be applied to and/or onto the roll of material web in order to secure the roll of material web in a substantially dimensionally stable manner, at least temporarily.
  • the adhesive can be, for example, an adhesive strip.
  • a further preferred embodiment is characterized in that the rotating body comprises at least one trough for receiving a winding element and/or a material web roll.
  • the winding element introduction device in particular the winding element drum, alternatively or additionally comprises at least one trough for receiving a winding element.
  • the trough can generally be viewed as a contour and generally includes a corresponding recess for arranging at least one winding element, a material web roll and/or at least one material web.
  • the rotating body or the winding element drum has a number or plurality of troughs in order to accommodate a corresponding number of winding elements and to transfer them to the material webs.
  • further means and/or properties can preferably be provided, for example an application of negative pressure, in order to hold the winding element and/or the material web roll, at least if necessary.
  • the material web roll can be formed in the at least one trough along the winding channel by at least temporarily placing the material webs against the winding counter.
  • the trough can provide a contour or the initiator for the start of the winding of the material web winding.
  • Such a trough can prevent the material web roll from slipping during the winding process, thereby preventing damage or clogging of the winding channel.
  • a plurality or plurality of troughs are provided along the circumference of the rotating body in order to provide continuous production of energy cells by means of the device.
  • the shape and/or depth of the trough can be selected depending on the starting materials or the desired dimension of the material web roll.
  • a winding element or a roll of material web may be transferable from a trough into a further receiving trough during the winding process.
  • a safe and gentle transport of the winding element or the material web roll can thus be provided.
  • the transport device can further preferably comprise at least one further rotating body having at least one trough.
  • the object is also achieved by the method according to the invention in that the material web roll is formed by a drivable rotating body comprising the winding device and a winding counter in a winding channel arranged in the winding station.
  • the method according to the invention ensures that the at least two material webs are reliably and uniformly wound into a material web roll.
  • the material web rolls are accordingly wound in the winding channel by placing the at least two material webs against the winding counter and the rotating body, while preferably a winding process of a further material web roll is subsequently or already carried out. meanwhile it begins.
  • the material web rolls are wound accordingly in the winding channel by the winding counter and the rotating body, which is preferably designed and set up to be rotatably driven.
  • the material webs are preferably fed continuously from an endless web, whereby the production of the material web rolls can also be produced continuously.
  • the material webs provided one above the other are fed centrally in the winding channel, so that no separate handling of the material webs to be wound around a fixed winding core is required.
  • the winding channel can preferably be designed dynamically in the course of the transport direction in order to successively form and set up the winding process along the transport section.
  • the winding is carried out by the material web roll to be produced being driven in the winding channel during the winding process by resting against the winding counter by means of the rotating body.
  • the material webs are wound in the winding channel, which ensures continuous production of material web rolls and energy cells.
  • the material webs can be wound up in the winding process together with all the material webs to be wound.
  • the material webs to be wound are arranged within the winding channel and can preferably be pulled and moved during feeding and fed together to the winding process “as one material web”.
  • the winding station with the winding channel reduces the number of feeds and/or transport devices required during the winding process, which enables faster and more flexible production of energy cells.
  • the material webs to be wound can also be transported more flexibly and wound using the winding support, which means that an increased number of windings and geometries of the energy cells can be produced and the risk of the material webs slipping or breaking is reduced.
  • a winding element can preferably be provided around which the at least two material webs are wound in the winding channel to form a material web roll.
  • a winding start or a winding element can be produced from at least one of the material webs, around which the at least two material webs are wound in the winding channel to form a material web roll.
  • An expedient embodiment of the invention is characterized in that the material webs are transported on the rotating body at least in some areas along the winding channel, the material web roll being formed by placing the material webs in contact with the winding counter.
  • a further development is characterized in that the winding channel is expanded and/or changed along the transport section in such a way that the material web roll is formed with a predetermined winding during transport through the winding channel.
  • the material web roll is formed by a stationary winding contour of the winding counter and the rotating body along the winding channel
  • An expedient embodiment of the invention is characterized in that the material webs form and establish a change of state at least in some regions by engaging at least one of the material webs with an at least partially structured surface of the winding counter.
  • the change in state is, for example, a start of winding to produce a material web winding or at least partial material compression.
  • the materials rial webs are wound around a wrap start to form a wound material web roll, the wrap start being generated by engagement of at least one of the material webs with an at least partially structured surface of the winding counter.
  • a further preferred embodiment of the invention is characterized in that a start of the winding is generated by means of at least one engagement element which is arranged or can be arranged in the winding channel, wherein the at least one engagement element on the winding counter is brought into operative connection with at least one of the material webs or into engagement in the winding channel with at least one of the material webs protruding into it.
  • the winding element with the material webs or a start of the winding is set in rotation upon engagement with the engagement element in order to initiate the winding process.
  • the engagement element is designed in such a way that it is at least partially brought into operative connection with the winding element or the start of the winding or protrudes into the winding channel for engagement with the winding element or the start of the winding.
  • a preferred development of the invention is characterized in that the at least one engagement element protrudes into the winding channel through an opening provided on the winding counter and/or through an opening on the rotating body to produce the start of the winding.
  • a further expedient embodiment of the invention is characterized in that before or with the winding of the material webs, a winding element extending in the direction of the longitudinal axis of the energy cell is brought into operative connection with at least one surface of the material webs to be wound by means of at least one winding element insertion device upstream of the winding device.
  • a further preferred embodiment of the invention is characterized in that at least one of the material webs and/or the material web rolls is/are cut transversely and/or longitudinally to the transport direction by means of a cutting device, preferably arranged before and/or after the winding device.
  • the material webs or the material web roll are/are in the winding station by means of the rotating body. pers and/or the winding support is at least partially tempered and/or subjected to pressure.
  • a further development is characterized in that the material web roll is delivered from the winding device by means of at least one delivery device arranged downstream of the winding device.
  • FIG. 1 shows a schematic representation of a first embodiment of a device according to the invention in cross section
  • Fig. 2 is a schematic representation of a second embodiment of a device according to the invention in cross section and
  • Fig. 3 is a schematic representation of a third embodiment of a device according to the invention in cross section.
  • the devices 10 shown in the drawings are designed and set up as independent and separate devices 10 by way of example.
  • the invention relates in the same way to a comparable device 10, which is integrated in a more complex system with several assemblies or upstream and/or downstream further device or machine components.
  • Such devices 10 can be designed and set up to be variable, in particular in terms of (machine) width, so that several material webs 11, 12, 13, 14 can be processed in parallel using the device 10.
  • a plurality or number of material webs 11, 12, 13, 14 can be processed in parallel on a device 10. be worked by adjusting the width of the device components accordingly.
  • the intended facilities and the respective means must be adapted accordingly in order to provide broad scalability.
  • the intended material webs 11, 12, 13, 14 are preferably produced in a manufacturing machine, which can include a device 10 according to the invention and/or which a device 10 according to the invention is arranged downstream.
  • a manufacturing machine which can include a device 10 according to the invention and/or which a device 10 according to the invention is arranged downstream.
  • Such a manufacturing machine - not shown in the figures - preferably comprises different steps in order to produce the corresponding material webs 11, 12, 13, 14 with the intended properties for producing a wound energy cell 17.
  • the material webs 11, 12, 13, 14 are generally provided as endless webs and can already be pre-cut in the intended lengths and/or widths.
  • the material webs 11, 12, 13, 14 can also preferably be connectable to one another at least in some areas to form a material web composite.
  • the material webs 11, 12, 13, 14 are preferably selected from two separator material webs 11, 13 and one anode material web 12 and one cathode material web 14.
  • FIG. 1 to 3 each show schematically a different embodiment of a device 10 according to the invention.
  • the device 10 is used to produce wound energy cells 17 from at least two material webs 11, 12, 13, 14 arranged one above the other.
  • the material webs 11, 12, 13, 14 can be fed to the device 10 at least partially one above the other by means of at least one feed device 15, with only one feed device 15 being shown in the illustrated embodiments.
  • the material webs 11, 12, 13, 14 can also be transported one above the other at a (slight) distance.
  • the at least two material webs 11, 12, 13, 14 can be present as a material web composite that is connected at least in some areas.
  • the at least two material webs 11, 12, 13, 14 can be connected at least in some areas to form a material web composite before winding.
  • the material web composite is preferably produced before or during winding.
  • the material webs 11, 12, 13, 14 arranged one above the other are each shown as an example as a single material web 11, 12, 13, 14, the material webs 11, 12, 13, 14 arranged one above the other having at least one surface 18.
  • the surface 18 of the material webs 11, 12, 13, 14 is not on the surface side limited, but can also be arranged on the underside of the material webs 11, 12, 13, 14. Surface 18 basically means all of the free surfaces of the material webs 11, 12, 13, 14.
  • the device 10 comprises a transport device 19 for at least partially transporting the material webs 11, 12, 13, 14 in the transport direction T along a transport section through the device 10, the transport device 19 comprising at least one transport element 20.
  • the device 10 further comprises a winding device 21 for winding the material webs 11, 12, 13, 14 into a wound material web roll 22 in a winding station 23 comprising the winding device 21.
  • windings in the material web windings 22 and in the energy cells 17 are shown schematically in the figures as concentric circles arranged one above the other.
  • a corresponding winding of material webs 11, 12, 13, 14 arranged one above the other would, when used as intended, appear spiral-shaped in cross-section or without closed circular segments.
  • the device 10 is characterized according to the invention in that the winding device 21 comprises a drivable rotating body 24 and a winding counter 25, the rotating body 23 and the winding counter 24 forming and setting up a winding channel 26 arranged in the winding station 23 to form the material web roll 22.
  • 1 to 3 show an example of the course of the winding in the winding channel 26 of the winding station 23.
  • the material web roll 22 is shown within the winding channel 26 in different states of winding, with the winding gradually increasing in diameter in the course of the transport direction T or in the circumferential direction 27 of the rotating body 24 due to the winding of the material webs around the already formed material web roll 22.
  • the rotating body 24 is preferably rotatably driven and rotates about its axis in the circumferential direction 27, which preferably represents the transport direction T of the material webs 11, 12, 13, 14.
  • the rotating bodies 24 are shown as examples of rotationally symmetrical bodies, in particular rollers, drums, rods, cylinders, etc.
  • the rotating body 24 it is not necessary for the rotating body 24 to have such a design. It is only necessary that the Rotary body 24 in conjunction with the winding counter 25 winds the material webs 11, 12, 13, 14 in the winding channel 26 to form a material web roll 22.
  • the rotation body 24 is designed and set up to be changeable in its arrangement relative to the winding support 25 and/or the winding support 25 in its arrangement relative to the rotation body 24 in such a way that the winding channel 26 can be enlarged and/or reduced in the course of winding the material webs 11, 12, 13, 14.
  • the distance between the rotating body 24 and the winding counter 25 can preferably be adjusted to one another by changing the position of at least one of the device components. Due to the changeability of the winding channel 26, a direct influence can be had on the material webs 11, 12, 13, 14 to be wound or the material web roll 22.
  • FIG. 1 to 3 show the embodiments of the device 10 in cross section and, as an example, a material web 11, 12, 13, 14 is shown on the feed device 15 and on the transport device 19.
  • a plurality or number of material webs 11, 12, 13, 14 can be transported simultaneously, that is, for example next to one another, within the device 10 and by means of the at least one winding device 21 to form a material web winding 22 and to an energy cell 17 be producible.
  • the corresponding device components are preferably adapted in width so that a substantially parallel production of several energy cells 17 can be carried out.
  • the material webs 11, 12, 13, 14 can be transported on the rotating body 24 at least in some areas along the winding channel 26, the material web roll 22 being able to be formed by placing the material webs 11, 12, 13, 14 with the winding counter 25.
  • the winding counter 25 forms a contact surface which is designed and set up for at least partial contact with the material webs 11, 12, 13, 14 or the material web roll 22.
  • the winding channel 26 is preferably expanded, expandable and/or changeable along the transport section in such a way that the material web roll 22 can be formed with a predetermined winding during transport through the winding channel 26.
  • the expansion takes place in the exemplary embodiments in that the winding channel 26 is designed such that the distance between the rotating body 24 and the winding counter 25 increases.
  • An alternative increased spacing can also be formed, for example, by means of a corresponding curve control of the rotating body 24.
  • the winding counter 25 has a stationary winding contour 28, with the winding channel 26 being designed and set up depending on the winding contour 28 and the rotating body 24.
  • the winding contour 28 is formed by the design of the winding support 25, which produces the winding contour 28 through the interaction with the rotating body 24.
  • the winding contour 28 is crucial for the production of the material web winding 22, since the number of windings of the material webs 11, 12, 13, 14 and the corresponding force input by the rotating body 24 can be adjusted by means of the winding contour in particular 28.
  • the winding counter 25 preferably has a structured surface 29 at least in some areas, the structured surface 29 being designed and set up to produce a winding start 30 when it engages with at least one of the material webs 11, 12, 13, 14, the material webs 11, 12, 13 , 14 can be wound around the beginning of the wrap 30 to form a wound roll of material web 22.
  • the structured surface 29 can be designed and set up, for example, as a (local) elevation.
  • the structured surface 29 can be a depression, in particular a groove or a recess.
  • the original transport of the material web(s) 11, 12, 13, 14 along the transport section is irritated, as a result of which a winding start 30 can be generated.
  • the effect is exploited that at least one of the material webs 11, 12, 13, 14 is compressed by the structured surface 29, as a result of which a local accumulation of material webs occurs, which acts as the beginning of the winding 30.
  • the beginning of the winding 30 represents a winding element around which the material webs 11, 12, 13, 14 are wound within the winding channel 26 by means of the rotating body 24 and the winding counter 25 to form the material web winding 22.
  • the beginning of the wrap 30 is formed from at least one separator material web 11, 13, particularly preferably from two separator material webs 11, 13.
  • the at least one engagement element 30 is designed and set up to protrude into the winding channel 26 through an opening provided on the winding support 25 and/or through an opening provided on the rotation body 24.
  • the winding contour 28 can be changed locally within the winding channel 25 by the engagement element 31, as a result of which the transport of the material webs 11, 12, 13, 14, which is conventionally provided by means of the rotating body 24, is disrupted.
  • the engagement element 31 changes the “undisturbed” transport of the material webs 11, 12, 13, 14, whereby they are jammed and can be formed into a local collection of material webs, which creates the beginning of the wrap 30 around which the material webs 11, 12, 13, 14 continue of the winding channel 26 can be wound into the material web roll 22.
  • the engagement element 31 is preferably at least partially rotatable about an axis 33, alternatively generally movable, designed and set up to protrude into the winding channel 26 if necessary, that is, when a winding start 30 is desired.
  • At least one winding element insertion device 34 is arranged upstream of the winding device 21, which is designed and set up to have a winding element 35 extending in the direction of the longitudinal axis of the energy cell 17 in operative connection before or with the winding of the material webs 11, 12, 13, 14 with at least one surface 18 of the material webs 11, 12, 13, 14 to be wound.
  • a winding element insertion device 34 is shown in FIG. 2.
  • the winding element insertion device 34 is designed and set up in FIG. 2 as a rotatable body, for example as a drum, roller, roller, cylinder, shaft, coil or the like, in particular essentially rotationally symmetrical.
  • the winding element introduction device 34 is designed as a winding element drum and is set up to transfer the winding element 35 to the material webs 11, 12, 13, 14 before or at the start of the winding process.
  • the winding element 35 is positioned transversely or longitudinally to the transport direction T of the material webs 11, 12, 13, 14 on the surface 18 of at least one of the materials by means of the winding element introduction device 34.
  • rial tracks 11, 12, 13, 14 can be arranged, preferably fixed. The fixed arrangement can be formed, for example, by means of an adhesive, which can be applied to the winding element 35 and/or the surface 18 of one of the material webs 11, 12, 13, 14 by an adhesive application device (not shown in the figures).
  • the fixation of the winding element 35 on at least one surface 18 can particularly preferably be done using glue.
  • the winding element 35 is further preferably durable by applying negative pressure to the winding element insertion device 34.
  • the winding element insertion device 34 can comprise at least one trough for receiving the winding element 35.
  • the transport element 20 or the rotating body 24 can be designed and set up as a winding element insertion device 34 in that the winding elements 35 are placed on the surface 18 of at least one of the material webs 11, 12, 13 by means of the circumference of the rotating body 24 , 14 can be arranged.
  • the rotating body 24 preferably comprises at least one trough for receiving a winding element 35 and/or a material web roll 22.
  • the material web roll 22 is further preferably in the at least one trough along the winding channel 26 by at least temporarily abutting the material webs 11, 12, 13, 14 against the Wrapping counter 25 can be formed.
  • At least one of the material webs 11, 12, 13, 14 and/or the material web wrap 22 is/are cut transversely and/or longitudinally to the transport direction T by means of a cutting device 36, preferably arranged before and/or after the winding device 21.
  • a cutting device 36 is shown schematically in FIGS. 1 and 2, which is designed and set up for cutting the material webs 11, 12, 13, 14.
  • the device 10 of FIG. 3 also includes a corresponding cutting device.
  • the material webs 11, 12, 13, 14 can preferably be cut in terms of their length and/or their width.
  • the material web rolls 22 can also be cut and/or, more preferably, certain cutting patterns of the material webs 11, 12, 13, 14 can be carried out.
  • the material webs 11, 12, 13, 14 are cut to length in a predetermined length, which is defined by the subsequent winding, the cutting process and/or the corresponding cutting means.
  • the cutting device 36 is further preferably arranged in front of the winding device 21, whereby the endless web 16 can be separated before or after winding in order to ensure continuous production of the energy cells 17.
  • the at least one cutting device 35 or a further cutting device 36 can have a winding element 35 to be arranged on the at least one surface 18 before and / or after the arrangement on the at least one material web 11, 12, 13, 14 according to a predetermined length, width and /or cut shape.
  • the rotary body 24 and/or the winding support 25 is/are designed and set up to be able to withstand temperatures and/or pressure at least in some areas in order to apply a temperature and/or pressure to the material webs 11, 12, 13, 14 or the material webs 11, 12, 13, 14 or the Enter material web wrap 22.
  • the rotating body 24 and/or the winding support 25 is preferably designed and set up to be heatable and/or coolable.
  • the rotating body 24 and/or the winding counter 25 can be designed and set up to be movable, for example with an adjustable pressure against the material webs 11, 12, 13, 14 and/or against the material web roll 22. The pressure can be generated, for example, by means of a cam control of the rotating body 24.
  • At least one dispensing device designed and set up for dispensing the material web rolls 22 - not shown in the figures - is arranged downstream of the winding device 21.
  • the delivery device can be designed and set up, for example, as a gripping arm, conveyor belt, drum, etc.
  • the procedure is explained in more detail below using the drawing.
  • the method is used to produce wound energy cells 17 from at least two material webs 1, 12, 13, 14 arranged one above the other, comprising the steps of feeding the material webs 11, 12, 13, 14 by means of at least one feed device 15, at least partially transporting the material webs 11, 12 , 13, 14 in the transport direction T along a transport section by means of a transport device 19 comprising a transport element 20, and winding the material webs 11, 12, 13, 14 into a wound material web roll 22 by means of a winding device 21 comprising a winding station 23.
  • FIGS 3 shows corresponding devices 10 for providing the method according to the invention.
  • This method is characterized according to the invention in that the material web roll 22 is formed by a drivable rotating body 24 comprising the winding device 21 and a winding counter 25 in a winding channel 26 arranged in the winding station 23.
  • 1 to 3 show different embodiments of the winding device 21, each of which is designed and set up in such a way that the rotating body 24 is in operative connection with one another in connection with the winding counter 25 in order to jointly form a winding channel 26 for producing the material web winding 22 from the material webs 11, 12, 13, 14 to form.
  • a plurality or plurality of material webs 11, 12, 13, 14 can preferably be produced simultaneously, that is, for example next to one another, by means of the at least one winding device 21 to form a material web roll 22.
  • the winding device 21 with the rotating body 24 and the winding counter 25 is in operative connection with the at least two material webs 11, 12, 13, 14 in order to form the material web roll 22.
  • the material webs 11, 12, 13, 14 are transported on the rotating body 24 at least in some areas along the winding channel 26, the material web roll 22 being formed by placing the material webs 11, 12, 13, 14 with the winding counter 25.
  • the material webs 11, 12, 13, 14 are preferably moved by the rotating body 24, which in the preferred embodiments also represents a transport element 20 of the transport device 19, by contacting the winding counter 25 in the winding channel 26 is formed in that the rotating body 24 transports the material webs or the material web roll 22 formed therefrom along the winding channel 26, whereby the material webs 11, 12, 13, 14 wind up in the course of the transport direction T.
  • the winding channel 26 is preferably expanded along the transport section in such a way that the material web roll 22 is formed with a predetermined winding during transport through the winding channel 26.
  • the distance between the rotating body 24 and the winding counter 25 gradually increases, as a result of which there is sufficient space for the winding of the material web roll 22.
  • the material web roll 22 is formed by a stationary winding contour 28 of the winding counter 25 and the rotating body 24 along the winding channel 26.
  • the material webs 11, 12, 13, 14 are moved along the winding contour 28 by means of the rotating body 24 in order to form and establish an influence on the winding and the shape of the material web winding 22.
  • the material webs 11, 12, 13, 14 in a preferred embodiment undergo a change of state at least in some areas through engagement of at least one of the material webs 11, 12, 13, 14 with a structured surface 29 which has the winding support 25 at least in some areas train and set up.
  • the material webs 11, 12, 13, 14 are wound around a winding start 30 to form a wound material web roll 22, the winding start 30 being formed by engagement of the material webs 11, 12, 13, 14 with a structured surface which has the winding counter 25 at least in some areas 29 is generated.
  • at least one of the material webs 11, 12, 13, 14 is transported over the structured surface 29 by means of the transport element 20, whereby the start of the winding 30 is created, for example by generating a collection of material webs.
  • the material web roll 22 is wound up in the winding channel 26 between the rotating body 24 and the winding counter 25.
  • a winding start 30 is generated by means of at least one engagement element 31 which is arranged or can be arranged in the winding channel 26, wherein the at least one engagement element 31 on the winding counter 25 is brought into operative connection with at least one of the material webs 11, 12, 13, 14 or is brought into the Winding channel 26 projects into the engagement with at least one of the material webs 11, 12, 13, 14.
  • a device 10 for forming the corresponding method step is shown in FIG.
  • the engagement element 31 is designed and set up for this purpose, preferably for engagement in the winding channel 26 with at least one of the material webs 11, 12, 13, 14 as required.
  • the engagement element is preferably guided out of the winding channel 26 again so that the material webs 11, 12, 13, 14 are not hindered during transport.
  • the at least one engagement element 31 is designed and set up to protrude into the winding channel 26 through an opening 32 provided on the winding counter 25 and/or through an opening 32 provided on the rotating body 24 to produce the start of the winding 30.
  • a winding element 35 extending in the direction of the longitudinal axis of the energy cell 17 is operatively connected to at least one surface by means of at least one winding element insertion device 34 upstream of the winding device 21 18 of the material webs 11, 12, 13, 14 to be wrapped.
  • at least one of the material webs 11, 12, 13, 14 and/or the material web roll 22 is cut transversely and/or longitudinally to the transport direction T by means of a cutting device 36, preferably arranged before and/or after the winding device 21.
  • a cutting device 36 is shown schematically in FIGS. 1 and 2, which is designed and set up for cutting the material webs 11, 12, 13, M.
  • the material webs 11, 12, 13, 14 are preferably cut in terms of their length and/or their width.
  • the material web rolls 22 can also be cut and/or, more preferably, certain cutting patterns of the material webs 11, 12, 13, 14 can be carried out.
  • the material webs 11, 12, 13, 14 are cut to length in a predetermined length, which is defined by the subsequent winding, the cutting process and/or the corresponding cutting means.
  • the material webs 11, 12, 13, 14 or the material web roll 22 in the winding channel 26 are heated and/or cooled and subjected to pressure at least in some areas by means of the rotating body 24 and/or the winding support 25.
  • the temperature control or pressure load further properties can be generated in the material webs 11, 12, 13, 14 and/or in the material web roll 22, which can be adjusted accordingly by appropriate control/regulation of the duration of the temperature control or pressure load.
  • the material webs 11, 12, 13, 14 are preferably connected to one another at least in some areas before the winding process in order to be fed together to the winding device 21.
  • the material web roll 22 is, in preferred embodiments, delivered from the winding device 21 by means of at least one dispensing device arranged downstream of the winding device 21 - not shown in the figures.
  • the delivery device can, for example, be integrated into the transport device 19 and/or connected to the transport device 19, so that a continuous production and delivery process of the material web rolls 22/energy cells 17 is provided.
  • the dispensing device preferably comprises at least one - in the figures not shown - fixing device, which is designed and set up for at least partially fixing the material web roll 22.
  • an adhesive for example an adhesive strip, a tape or the like, can be introduced/applied to at least one surface of the material webs 11, 12, 13, 14 and/or on a surface of the material web roll 22 in order to prevent undesirable opening/development of the material web winding 22 after winding.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Replacement Of Web Rolls (AREA)

Abstract

La présente invention concerne un dispositif (10) de fabrication d'éléments d'énergie (17) enroulés, composés d'au moins deux bandes de matériau (11, 12, 13, 14) disposées de manière superposée, ledit dispositif comprenant au moins un dispositif d'alimentation (15) destiné à acheminer les bandes de matériau (11, 12, 13, 14), un dispositif de transport (19) destiné à transporter au moins par endroits les bandes de matériau (11, 12, 13, 14) dans la direction de transport (T) le long d'un segment de transport à travers le dispositif (10), le dispositif de transport (19) comprenant au moins un élément de transport (20) et un dispositif d'enroulement (21) destiné à enrouler les bandes de matériau (11,12,13, 14) en un enroulement de bande de matériau (22) enroulé dans un poste d'enroulement (23) comprenant le dispositif d'enroulement (21), l'invention se caractérisant en ce que le dispositif d'enroulement (21) comprend un corps de rotation (24) pouvant être entraîné et une butée d'enroulement (25), le corps de rotation (24) et la butée d'enroulement (25) formant 15 et configurant un canal d'enroulement (26) agencé dans le poste d'enroulement (23) pour former l'enroulement de bande de matériau (22). En outre, l'invention concerne un procédé correspondant.
PCT/EP2023/063817 2022-06-09 2023-05-23 Dispositif et procédé de fabrication d'un élément d'énergie enroulé présentant une butée d'enroulement WO2023237331A1 (fr)

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DE102022114557.3 2022-06-09
DE102022114557.3A DE102022114557A1 (de) 2022-06-09 2022-06-09 Vorrichtung und Verfahren zur Herstellung einer gewickelten Energiezelle mit einer Wickelgegenlage

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4975095A (en) * 1989-07-28 1990-12-04 Gates Energy Products, Inc. Method of winding an electrochemical cell and cell produced by the method
US5700299A (en) * 1996-12-12 1997-12-23 Eveready Battery Company, Inc. Battery core winder and method of winding a battery core

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4975095A (en) * 1989-07-28 1990-12-04 Gates Energy Products, Inc. Method of winding an electrochemical cell and cell produced by the method
US5700299A (en) * 1996-12-12 1997-12-23 Eveready Battery Company, Inc. Battery core winder and method of winding a battery core

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