Apparatus and method for producing coils for electrochemical cells, preferably intended for the production of batteries - Patent Application 20070122997

Abstract

The present invention relates to an apparatus (100) for producing coils for electrochemical cells, preferably intended for the manufacture of batteries, comprising: a supply unit (2) configured to supply at least one first strip-shaped article (N1) intended to form a first coil (B1) and a second strip-shaped article (N2) intended to form a second coil (B2), a winding unit (1) with a plurality of winding heads (10) including at least one first winding head (11) configured to wind the first strip-shaped article (N1) and a second winding head (12) configured to wind the second strip-shaped article (N2), and at least one movement device (3) for the winding heads (10) configured to move the first winding head (11) and the second winding head (12). The first winding head (11) and the second winding head (12) respectively define winding axes (X1, X2) that are substantially parallel to each other. The winding unit (1) is configured to define a separation plane (β), the separation plane (β) being substantially perpendicular to the winding axes (X1, X2), and the separation plane (β) is arranged such that, at least in the first winding head (11) and the second winding head (12), one of the first strip-shaped article (N1) and the second strip-shaped article (N2) is located on one side of the separation plane (β), and the other of the first strip-shaped article (N1) and the second strip-shaped article (N2) is located on the opposite side thereof.

Description

[Technical Field]

[0001] The present invention relates to an apparatus for making coils of the type formed by winding a strip-like article, for example comprising a strip or a number of overlapping strips.

[0002] The present invention also relates to a method for making such a coil. [Background technology]

[0003] The invention finds a preferred, but not exclusive, application in the field of electrochemical cell manufacturing, in which windings of strip-like material are used.

[0004] In particular, it is known in the relevant art to combine conductor and separator strips in layers to form anode and cathode structures, and the resulting stack of layers is then wound into a coil using specialized equipment for use in constructing the electrochemical cell itself.

[0005] The device may be provided with a core for winding the strip-like product to form a coil, and possibly with several winding cores, each intended for winding a coil. Summary of the Invention [Problem to be solved by the invention]

[0006] In this specification and the appended claims, certain terms and phrases, unless expressly stated otherwise, shall be deemed to have the meanings set forth in the following definitions.

[0007] The term "strip-like product" means any solid product that is provided in an industrial production line in the form of an elongated strip or ribbon, i.e., an element whose longitudinal extension is significantly greater than its transverse extension. A strip-like product can be formed by a single strip or ribbon of material or by superimposing several strips arranged in layers.

[0008] The strip-like article also has properties that allow it to undergo some bending as it advances along the opposing production lines.

[0009] Strip-like articles can be made, for example, by stacking alternating conductor and insulating layers, which are intended to form a sandwich configuration that is wound to make a coil for the manufacture of an electrochemical battery or capacitor.

[0010] The term "strip" refers to any solid product that is provided in an industrial production line in the form of an elongated element or ribbon, i.e., an element whose longitudinal extension is significantly greater than its transverse extension. The strip may be formed by a single layer or by several overlapping layers.

[0011] For example, the strip may be formed by a first layer of conductive or insulating material, over which a coating may be applied to form a second layer.

[0012] The term "winding" refers to the creation of a spiral structure by the rotation of a strip, ribbon, or more generally a strip-like article around an axis, flat surface, or another structure. By winding, the strip-like article makes one or more turns around the axis or structure.

[0013] The term "coil" means any helical structure formed by winding a strip, ribbon, or more generally a strip-like article around an axis, flat surface, or other winding structure. Depending on the structure around which the strip-like article is wound, the overall shape of the coil may be substantially cylindrical, as opposed to flattened or other shapes.

[0014] As mentioned above, the coil is not only applicable in the field of electrochemical cells, but also in other fields, such as conductors, in which coil-shaped structures can likewise be used.

[0015] The term "closed path" means a path traveled by a spooling head or other element, the beginning and end of which are substantially coincident.

[0016] The term "continuous" refers to a movement and means that the movement of the object is uninterrupted, without any pauses or interruptions. In particular, with respect to the movement of a strip or other element, the term "continuous" indicates that the strip does not stop during its movement.

[0017] The term "substantially constant" when referring to a measurement or quantity, such as the displacement rate of an object, means that such measurement or quantity maintains a value over time that preferably varies by at most ±10%, preferably at most ±5%, preferably at most ±2%.

[0018] The term "integral" referring to the movement of two or more elements means that these elements perform substantially the same movement substantially simultaneously. In other words, two integrated elements are not necessarily joined or constrained to each other, but move together as a single component. In practice, it may be provided that the respective motion systems of the two elements are adjusted as needed to move the two elements together. Furthermore, a temporary constraint between the two elements may be used. This constraint may, for example, join the two elements together in several steps, move them together, and then separate them again, allowing them to move independently of each other.

[0019] Also, note that the phrase "displacing an object between a first position and a second position" refers to both displacement from the first position to the second position and displacement from the second position to the first position.

[0020] This definition applies equally well to similar expressions of motion, such as moving a general object between two positions, between two regions, or between two different motion configurations.

[0021] The term "alternating motion" refers to a motion between two positions, whereby a body or component is displaced between a first position and a second position and then returned to the first position. This motion can be repeated once or an indefinite number of times. Furthermore, the trajectory between the two points can be the same for the outward journey between the first position and the second position and the return journey between the second position and the first position. The trajectory the body follows between the two positions can also be different for one repetition of the motion from another repetition of the motion.

[0022] In the context of the present invention, the expressions "substantially parallel" and "substantially perpendicular" refer to two directions of movement or deployment of two different bodies and indicate a state of parallelism and orthogonality between the two directions, preferably meaning a deviation of ±10°, more preferably ±5° from perfect parallelism and perfect orthogonality.

[0023] In the context of the present invention, the expression "substantially horizontal" refers to a direction perpendicular to the direction of gravity, whether relative to the direction of movement, the direction of deployment or the positioning of the body, and implies a deviation of ±10°, preferably ±5°, respectively, from perfect orthogonality.

[0024] In the context of the present invention, the term "interconnected" refers to two or more separate components or bodies and indicates the existence of a mechanical, electrical, or electromechanical connection between the two components or bodies, which connection creates a dependency between the motion of one component and the motion of the other. This dependency can be both such that the two components or bodies move together, i.e., according to the same laws of motion, or such that the two components or bodies move simultaneously, i.e., simultaneously, although not necessarily according to the same laws of motion, or such that one component or body moves sequentially, according to a predetermined order, relative to the motion of the other body or component.

[0025] The interconnection may be via a physical connection, for example a mechanical connection or wiring, or may be without a physical connection, for example via a non-contact sensor that detects movement of a component or body so as to send a signal that causes a corresponding movement in another component or body.

[0026] In the context of the present invention, the term "substantially simultaneously" refers to expressions of motion, hereinafter indicating that two components or bodies move together at the same time.

[0027] Simultaneity may affect the entire path of motion or part of it. Thus, it is sufficient that between the displacements of two components or bodies there is a moment when their motions overlap.

[0028] The applicant has preliminarily observed that, in the context of a continuous need to improve the performance and efficiency of manufacturing processes, the winding speed of the strip-like article used to form the coils in a manufacturing line for making coils can be a significant factor limiting the manufacturing capacity of the line itself.

[0029] Furthermore, this limitation is even more significant when high precision is required in the formation of the coil. In particular, the applicant has observed that in many applications, such as in the field of electrochemical battery manufacturing, high precision in the shape of the winding body must be ensured in order to ensure the required performance of the finished product.

[0030] However, applicants have recognized that there are inherent limitations to the speed of advancement, and therefore winding, related to both the materials used to form the coil and the technology available for the intended application.

[0031] The applicant has now realised that in order to increase the speed at which coils are made from strip-like articles, the above can be achieved by using two or more winding heads, each intended to form a respective coil.

[0032] The applicant has therefore further recognised how it is possible to increase the production capacity of a manufacturing line for making coils by providing a supply of two separate strip-like articles, each intended to form a respective coil.

[0033] Finally, the applicant has discovered that by keeping the strip-like articles properly separated, at least during winding to form the coils, it is possible to increase the production capacity of the line without giving up the required precision, both geometrically and dimensionally.

[0034] These characteristics make it possible to optimally utilize the production capacity of the manufacturing line, to provide for one or more additional movements of the winding head without introducing any particular complexity into the management of the advancement of the individual strips that arises when using two separate strip-like articles, and to provide for the supply of a single base strip that is subsequently separated into two parts intended to form coils relative to the respective strip-like articles, without introducing any particular complexity into the structure of the device. [Means for solving the problem]

[0035] Thus, in a first aspect thereof, the present invention relates to an apparatus for making coils for electrochemical cells, preferably intended for the manufacture of batteries.

[0036] Preferably, the apparatus comprises a supply unit configured to supply at least one first strip-shaped article, preferably intended to form a first coil, and a second strip-shaped article, preferably intended to form a second coil.

[0037] Preferably, the apparatus comprises a winding unit comprising a plurality of winding heads including at least one first winding head configured to wind a first strip-shaped product and a second winding head configured to wind a second strip-shaped product.

[0038] Preferably, the first and second winding heads each define a winding axis that is substantially parallel to one another.

[0039] Preferably, the apparatus comprises at least one winding head movement device configured to move the first winding head and the second winding head.

[0040] Preferably, the winding unit is configured to define a separation plane between the first winding head and the second winding head.

[0041] Preferably, the separation plane is substantially perpendicular to the winding axis.

[0042] Preferably, the separation plane is arranged so that, at least in the first winding head and the second winding head, one of the first strip-shaped article and the second strip-shaped article is located on one side of the separation plane and the other is located on the opposite side.

[0043] These properties allow the coil making apparatus of the present invention to perform substantially simultaneous winding of two separate coils, which can therefore provide greater productivity at the same winding speed of the strip-like article and / or the same feed speed of the strip-like article to the winding head.

[0044] At the same time, the strip-like article can be kept separated relative to the separation plane while being wound to form two separate coils.

[0045] In this way, the first and second streams of strip-like articles, and the streams of strips that form them, can be kept separate.

[0046] The arrangement of the separation planes allows the streams to be kept adjacent at the same time and allows the head to use a suitable configuration to perform the winding operation both in a stationary position, i.e., with only rotational movement about the relative winding axis, and while moving, e.g., with linear translational movement.

[0047] This configuration also makes it easy to perform cutting operations on strips or strip-like articles, for example by splitting one stream into two separate streams or by simultaneously processing adjacent edges of two strips or strip-like articles separated by a separation plane.

[0048] In its second aspect, the present invention relates to a method for making a coil for an electrochemical cell, preferably intended for the production of a battery.

[0049] Preferably, the method comprises the steps of providing a first strip-like article and a second strip-like article.

[0050] Preferably, the method includes the steps of winding a first strip-like article to form a first coil and winding a second strip-like article to form a second coil.

[0051] Preferably, the first strip-shaped article and the second strip-shaped article are wound around respective winding axes that are substantially parallel to each other.

[0052] Preferably, the first strip-shaped article and the second strip-shaped article are separated by a separation plane, at least during winding.

[0053] Preferably, the separation plane is substantially perpendicular to the winding axis.

[0054] The method of this embodiment also allows for increased production capacity on a coil manufacturing line, allowing for the simultaneous winding of two separate coils.

[0055] Thus, for the same winding speed of the strip-like goods and / or the same feeding speed of the strip-like goods to the winding head, greater productivity can be obtained.

[0056] Furthermore, as in the previous embodiment, the first and second strip-like articles may be advanced along two separate paths separated at least in part by a separation plane, thereby enabling the strip-like articles to assume an optimal advance trajectory so as to increase their speed and / or reduce tension conditions that may arise during the operations required to form the coil.

[0057] In its third aspect, the present invention relates to an apparatus for making coils for electrochemical cells, preferably for the production of batteries.

[0058] Preferably, the apparatus comprises a supply unit configured to supply at least one first strip-shaped article, preferably intended to form a first coil, and a second strip-shaped article, preferably intended to form a second coil.

[0059] Preferably, the apparatus comprises a winding unit comprising a plurality of winding heads, including at least one first winding head configured to wind a first strip-shaped product and a second winding head configured to wind a second strip-shaped product.

[0060] Preferably, the apparatus comprises an interconnection device for interconnecting the first winding head and the second winding head.

[0061] Preferably, the interconnection device is configured such that the first and second winding heads at least partially substantially simultaneously perform one or more of rotation about their respective winding axes, translation, and rotation about a further axis of rotation different from the winding axes.

[0062] Alternatively, the interconnection device is preferably configured such that the first winding head, followed by the second winding head, performs one or more of rotation about their respective winding axes, translation, and rotation about a further axis of rotation different from the winding axes, according to a predetermined sequence.

[0063] This characteristic of the invention according to this aspect allows for the envisaged presence of two different winding heads operating simultaneously or in any case in concert in the case of subsequent movement movements in order to create two separate coils.

[0064] In this way, greater productivity can be achieved with the same winding speed of the strip-like goods and / or the same feeding speed of the strip-like goods to the winding head.

[0065] It should also be noted that the winding head can be moved according to a particular trajectory during winding of the strip-like article, or possibly before or after such winding, for example while feeding the strip-like article or while unwinding the produced coil, or during other operations on the coil itself.

[0066] In its fourth aspect, the present invention relates to a method for making a coil for an electrochemical cell, preferably intended for the manufacture of a battery.

[0067] Preferably, the method comprises the steps of providing a first strip-like article and a second strip-like article.

[0068] Preferably, the method includes the steps of winding a first strip-like article to form a first coil and winding a second strip-like article to form a second coil.

[0069] Preferably, the method includes the step of interconnecting the first and second winding heads so that they move substantially simultaneously or so that the first winding head is followed by the second winding head in accordance with a predetermined sequence.

[0070] It should be noted that, based on this embodiment, it is possible to achieve results and advantages equivalent to those described in relation to the previous embodiment.

[0071] In a fifth aspect thereof, the present invention relates to an apparatus for making coils for electrochemical cells, preferably for the manufacture of batteries.

[0072] Preferably, the apparatus comprises a supply unit configured to supply at least one first strip-shaped article, preferably intended to form a first coil, and a second strip-shaped article, preferably intended to form a second coil.

[0073] Preferably, the apparatus comprises a winding unit comprising a plurality of winding heads, including at least one first winding head configured to wind a first strip-shaped product and a second winding head configured to wind a second strip-shaped product.

[0074] Preferably, the apparatus comprises at least one delivery device configured to deliver a base strip and at least one separation device configured to separate the base strip to form a first strip and a second strip intended to form a first strip-shaped article and a second strip-shaped article, respectively.

[0075] These properties allow a single strip, the base strip, to be used to supply and create two separate coils.

[0076] For example, the base strip can be gathered into a specific coil that is gradually unwound and separated to form two separate strips.

[0077] In this way, a single strip supply is sufficient to create two separate coils substantially simultaneously.

[0078] Consequently, this aspect of the invention also contributes, on a general level, to an increase in the productivity of the device, always at the same winding speed of the strip-like goods and / or the same feeding speed of the strip-like goods to the winding head.

[0079] In its sixth aspect, the present invention relates to a method for making a coil for an electrochemical cell, preferably intended for the manufacture of a battery.

[0080] Preferably, the method comprises the steps of providing a first strip-like article and a second strip-like article.

[0081] Preferably, the method includes the steps of winding a first strip-like article to form a first coil and winding a second strip-like article to form a second coil.

[0082] Preferably, the method includes the steps of feeding a base strip to form a first strip and a second strip intended to form a first strip-shaped article and a second strip-shaped article, respectively, and separating the base strip.

[0083] It should be noted that, based on this embodiment, it is possible to achieve results and advantages equivalent to those described in relation to the previous embodiment.

[0084] In a sixth aspect thereof, the present invention relates to an apparatus for making coils for electrochemical cells, preferably for the manufacture of batteries.

[0085] Preferably, the apparatus comprises a supply unit configured to supply at least one first strip-shaped article, preferably intended to form a first coil, and a second strip-shaped article, preferably intended to form a second coil.

[0086] Preferably, the apparatus comprises a winding unit, the winding unit comprising at least one winding head configured to wind the first strip-shaped product and the second strip-shaped product.

[0087] Preferably, the apparatus comprises at least one delivery device configured to deliver a base strip and at least one separation device configured to separate the base strip to form a first strip and a second strip intended to form a first strip-shaped article and a second strip-shaped article, respectively.

[0088] These properties allow a single strip, the base strip, to be used to supply two separate coils intended to make the coil.

[0089] For example, the base strip can be gathered into a specific coil that is gradually unwound and separated to form two separate strips.

[0090] In this way, it is sufficient to provide a single strip to make two separators for use in the manufacture of, for example, electrochemical cells.

[0091] This feature of the present invention also simplifies the manufacture of double start coils, i.e., coils having two pairs of conductor strips wound around the coil and two pairs of opposing separators arranged alternately.

[0092] This aspect of the invention also allows a machine for making one-start coils to be adapted for use in making coils with more than one principle by separating the base strips.

[0093] In its eighth aspect, the present invention relates to a method for making a coil for an electrochemical cell, preferably intended for the manufacture of a battery.

[0094] Preferably, the method comprises the steps of providing a first strip-like article and a second strip-like article.

[0095] Preferably, the method includes the step of winding the first strip-like article and the second strip-like article to form a coil.

[0096] Preferably, the method includes the steps of feeding a base strip to form a first strip and a second strip intended to form a first strip-shaped article and a second strip-shaped article, respectively, and separating the base strip.

[0097] It should be noted that, based on this embodiment, it is possible to achieve results and advantages equivalent to those described in relation to the previous embodiment.

[0098] In at least one of the above-mentioned aspects, the present invention may have at least one of the following further preferred features.

[0099] Preferably, the first strip-like product is wound by a first winding head, and the second strip-like product is wound by a second winding head.

[0100] This property allows two coils to be made at two separate locations, substantially simultaneously or independently of each other. It should be noted that the two winding heads may have common components, for example, if aligned on the same axis, or may be formed by different regions of the same body or element.

[0101] Preferably, the winding axis of the first winding head and the winding axis of the second winding head are substantially coaxial. Preferably, the first winding head and the second winding head are arranged side by side along an axis that coincides with the winding axis.

[0102] In this way, two parallel streams of strip-like articles, possibly strip streams, can be advantageously used which can be moved in a mirror-like manner relative to the separation plane to create two coils.

[0103] As a result, parallel operation allows two coils, possibly with identical characteristics, to be fabricated substantially simultaneously, thereby increasing the productivity of the device.

[0104] It should also be noted that if the winding axis of the first winding head and the winding axis of the second winding head are substantially coaxial, a single winding axis remains defined, ideally subdivided into two parts, the respective axes of the two heads being coincident.

[0105] Preferably, each of the winding heads is configured to rotate about a respective axis of the winding shaft.

[0106] Preferably, the winding unit is configured to rotate the winding heads respectively around the axes of the winding shafts.

[0107] These properties allow the winding of the strip to be carried out with a simple construction solution by rotation of the head itself, and allow winding to be carried out at high speeds.

[0108] Preferably, the winding head is translated and / or rotated about a further axis of rotation different from the winding axis while winding the first strip-shaped article and the second strip-shaped article.

[0109] Preferably, the movement device is configured to move the first winding head and / or the second winding head according to at least one translation and / or rotation about a further axis different from the winding axis.

[0110] The applicant has determined that by further moving the winding head in addition to rotating to wind the coil, it is possible to optimize the operations for making the coil during feeding, winding, unwinding the made coil, or other operations performed on the coil.

[0111] Preferably, at least one translation and / or rotation is performed during winding of the first strip-shaped product and / or the second strip-shaped product.

[0112] Providing movement during winding is particularly advantageous as it allows the flow of the strip-like article and / or the strip forming it to be controlled, limiting the occurrence of undesirable tension conditions or more generally increasing the productivity of the device.

[0113] Preferably, it is provided that the first and second winding heads are interconnected so that they move substantially simultaneously or so that the first winding head is followed by the second winding head in accordance with a predetermined sequence.

[0114] Preferably, the apparatus comprises an interconnection device for interconnecting the first winding head and the second winding head.

[0115] These properties make it possible to provide a mechanical, electromechanical or purely electronic interconnection between the two winding heads, so that the movement of one winding head can depend on or cooperate with the movement of the other winding head.

[0116] For example, the interconnection may be such that two winding heads move simultaneously, following similar orbits, or the movement of one head may be followed by the movement of the other head according to a predetermined sequence and trajectory.

[0117] Also, for example, in this second case, the first winding head can make a movement and stop, and immediately thereafter the second winding head can make its respective movement.

[0118] Preferably, moving the first and second winding heads substantially simultaneously, or moving the first winding head followed by the second winding head according to a predetermined sequence, includes one or more of rotating the winding heads about their respective winding axes, translating the winding heads, and rotating the winding heads about a further axis of rotation different from the winding axes.

[0119] Preferably, the interconnection device is configured so that the first and second winding heads substantially simultaneously perform one or more of rotation about their respective winding axes, translation, and rotation about a further axis of rotation different from the winding axes.

[0120] Preferably, the interconnection device is configured such that the first winding head, followed by the second winding head, performs one or more of rotation about their respective winding axes, translation, and rotation about a further axis of rotation different from the winding axes, according to a predetermined sequence.

[0121] It should be noted that the interconnection of the two winding heads during the above-mentioned movement makes it possible to provide for the creation of two separate coils with parallel and separated strip-like articles and / or two streams of strip, without the envisaged movement interfering with the advancement of the strip and the opposing strip-like articles.

[0122] Preferably, the further axis of rotation, which is different from the winding axis, is an axis that is substantially parallel to the winding axis.

[0123] This solution allows the winding head to be easily displaced from the area where the strip-like product is supplied and wound to another area, for example for unwinding the coils thus produced. At the same time, two or more winding heads can be provided, so that while two winding heads are winding two respective coils, the other winding head is in another area, for example in the coil unwinding area, and vice versa.

[0124] Preferably, the device comprises four winding heads.

[0125] Preferably, the device comprises six winding heads.

[0126] In this way, two or three pairs of winding heads can be provided, one pair for winding the strip and one pair, for example, in the unwinding area. If there are six winding heads, the third pair is in the intermediate area. This allows the rotation angle of the heads when passing from the winding area to the next area, for example, the unwinding area, to be small without affecting the overall dimensions of the device.

[0127] Preferably, the winding unit is configured such that the first winding head and the second winding head at least partially wind the first strip-shaped article and the second strip-shaped article, respectively, substantially simultaneously.

[0128] This feature allows two coils to be made virtually simultaneously, increasing the productivity of the machine at the same feed and winding speeds, and maximizing the potential for movement of the winding head. In this way, operations can be performed on both heads simultaneously.

[0129] Preferably, the interconnection device comprises a mechanical connection.

[0130] In this way, high synchronicity between the two winding heads can be more easily ensured.

[0131] Preferably, the mechanical connection comprises a support body configured to rotatably support the winding head.

[0132] Preferably, the support body is rotatable about an axis of rotation substantially parallel to the winding axis.

[0133] This characteristic allows both heads to be rotated, for example, around a further axis of rotation substantially parallel to the winding axis, thereby allowing both winding heads to be displaced from the area where winding of the strip-like article takes place to a further area where, for example, the coil is subjected to a subsequent operation or unwound, and vice versa.

[0134] Preferably, the mechanical connection comprises a frame structure that supports the winding head.

[0135] In this way, a direct connection can be made between the structures supporting both winding heads, which allows the two heads to be integrated into one unit. As a result, the mechanical connection is particularly simple and robust.

[0136] Preferably, the support body is rotatably connected to the frame structure, and the winding head is supported on the frame structure by the support body.

[0137] Preferably, the frame structure is movable.

[0138] In this way, the movements of the frame structure and the support body can be appropriately combined, which allows the winding head to perform various movements during, before and after winding, for example, providing a linear movement during winding and a rotation, for example, for unwinding the coil after the strip-like product has been wound. Furthermore, this feature also allows for complex movements, for example, a combination of rotation and translation.

[0139] Preferably, moving the first winding head and the second winding head substantially simultaneously, or moving the first winding head followed by the second winding head according to a predetermined sequence, includes moving the first winding head and the second winding head in an alternating motion.

[0140] Preferably, the framework is configured to move according to an alternating motion.

[0141] This feature allows, for example, the winding head to be positioned closer or further away from the feed area, or unwind area, or other area where further operations are performed on the coil, thereby allowing better control of the advancement of the strip-like article and limiting the occurrence of undesirable tension conditions, thereby accelerating the operation of making the coil.

[0142] Preferably, the alternating movement comprises translation along a translation axis.

[0143] Providing translational motion along a linear axis can simplify movement within the structure.

[0144] Preferably, the translational axis is substantially horizontal.

[0145] Horizontal movement is advantageous for optimizing overall dimensions and improving accessibility to the upper region of the device.

[0146] Preferably, it is provided to deliver a base strip and separate the base strip to form a first strip and a second strip intended to form a first strip-like article and a second strip-like article, respectively.

[0147] Preferably, the apparatus further comprises at least one delivery device configured to deliver the base strip and at least one separation device configured to separate the base strip to form first and second strips intended to form the first and second strip-shaped articles, respectively.

[0148] These properties allow a single strip, the base strip, to be used to supply and create two separate coils. For example, the base strip can be gradually unwound and gathered into a specific coil that is then separated to form two separate strips.

[0149] Preferably, the first strip and the second strip are separated by a separation plane.

[0150] Preferably, in embodiments in which the first strip and the second strip are wound onto a single winding head, e.g., in solutions based on two or more principles, the winding unit is configured to define a separation plane that is substantially perpendicular to the winding axis of the winding head.

[0151] In this way, the two streams can be advantageously separated after separating the base strip into two parts and during delivery of the strip.

[0152] This separation may be maintained all the way to the winding head, or alternatively the strips may be configured to change position relative to the separation plane in one or more regions and perform specific actions in those regions, for example by overlapping each other.

[0153] Preferably, there is provided a step of moving the second strip away from the first strip in a direction substantially perpendicular to the direction of advancement of the strips so that the first and second strips are separated by a separation plane.

[0154] Preferably, the apparatus comprises a diverting roller configured to move the second strip away from the first strip in a direction substantially perpendicular to the direction of advancement of the strip, preferably substantially parallel to the winding axis.

[0155] This feature can be advantageous, particularly when cutting the base strip to separate the strips, to distance the sides of the strip that remain close to each other after cutting.

[0156] Preferably, there is provided a step of moving the second strip toward the first strip in a direction substantially perpendicular to the direction of advancement of the strips, such that the first and second strips substantially overlap in a direction substantially parallel to the separation plane. Preferably, the movement of the second strip toward the first strip occurs after the movement of the second strip away from the first strip.

[0157] Preferably, the apparatus comprises a diverting roller configured to move the second strip closer to the first strip in a direction substantially perpendicular to the direction of advancement of the strip, preferably substantially parallel to the winding axis.

[0158] These properties allow the strip to be wound on a single winding head, making it possible to create more than one principle coil, or to use a single coil of base strip to create both separators in an electrochemical cell.

[0159] Also, a single delivery of the base strip can be used with each strip being wound on its own winding head, which simplifies the supply unit.

[0160] Preferably, the diverting rollers are substantially cylindrical. Preferably, the diverting rollers have rotation axes inclined relative to a direction substantially perpendicular to the separation plane, preferably by an angle α in the range 30° to 5°, preferably by an angle α in the range 25° to 10°, preferably by an angle α in the range 20° to 15°.

[0161] Preferably, the angle α is less than or equal to 30°, preferably 20°, preferably 15°, preferably 10°, preferably 5°.

[0162] These properties allow strip current separation to be achieved with a particularly simple and reliable solution.

[0163] Preferably, it is provided that the second strip is spaced away from the first strip in a direction substantially parallel to the separation plane.

[0164] Preferably, the apparatus comprises a diverting roller configured to move the second strip away from the first strip in a direction substantially parallel to the separation plane.

[0165] This feature is particularly advantageous for enabling the strips to return to parallelism after movement away from the separation plane.

[0166] In fact, the moving away is achieved by a diverting roller with an inclined axis.

[0167] Preferably, there is provided for moving the second strip closer to the first strip in a direction substantially parallel to the separation plane.

[0168] Preferably, the apparatus comprises a diverting roller configured to move the second strip closer to the first strip in a direction substantially parallel to the separation plane.

[0169] Preferably, the winding axis of the first winding head and the winding axis of the second winding head are substantially coaxial. Preferably, the first winding head and the second winding head are arranged side by side along an axis that coincides with the winding axis.

[0170] In this way, the strips can be returned to parallel alignment after separation at the separation plane.

[0171] Alternatively, in a two or more principle solution, the strips can be brought close together so as to overlap each other, for example to be wound on a single winding head.

[0172] It should be noted that some steps of the above-described methods may be performed independently of the order in which they are described, some steps may be optional, and some steps of the methods may be performed iteratively or in series or parallel with other steps of the methods. [Brief explanation of the drawings]

[0173] The features and further advantages of the present invention will become more apparent from the following detailed description of preferred embodiments, given by way of non-limiting example with reference to the accompanying drawings. [Figure 1] FIG. 2 is a side view of a detail of the device according to the invention. [Figure 2] FIG. 2 is a perspective view of the device of FIG. 1. [Figure 3] FIG. 2 is a plan view of the device of FIG. 1. [Figure 4] FIG. 2 is a further perspective view of the device of the present invention. [Figure 5] 1 is a plan view of the delivery device and separation device of the device of the present invention. FIG. [Figure 6]1 is a perspective view of a delivery device and a separation device of the device of the present invention. FIG. [Figure 7A] FIG. 10 is a plan view of a delivery device and a separation device of an apparatus according to an alternative embodiment of the present invention. [Figure 7B] 10 is a perspective view of a delivery device and a separation device of a device according to an alternative embodiment of the present invention. [Figure 8A] 10 is a plan view of a delivery device and a separation device of an apparatus according to a further embodiment of the present invention; FIG. [Figure 8B] 10 is a perspective view of a delivery device and a separation device of a device according to a further embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0174] Referring first to FIG. 4, an apparatus for making coils B1, B2 constructed in accordance with the present invention is shown generally at 100.

[0175] Advantageously, the apparatus 100 is configured to produce two separate coils, designated by the reference characters B1 and B2, respectively. As will be explained in more detail below, in a preferred embodiment, such coils are produced simultaneously, although the two coils may be produced at different moments, or may be produced only partially substantially simultaneously.

[0176] In a preferred embodiment, the coils B1 and B2 are each made by winding a strip-like article N1, N2, preferably intended for producing an electrochemical cell.

[0177] However, it should be noted that this represents a possible embodiment and that the device 100 according to the invention can also be intended to wind up strip-like articles intended for different applications, even in fields other than those related to the manufacture of electrochemical cells.

[0178] For example, in the field of energy storage, the invention may also be applied to the manufacture of other rolled parts for batteries and supercapacitors.

[0179] In particular, in the embodiment shown in Figure 4, the apparatus 100 can be used in a manufacturing line for coils for electrochemical batteries, in which each strip-like article N1, N2 is made by assembling a plurality of strips, preferably stacked one on top of the other.

[0180] For example, in the illustrated embodiment, each such series of strips advantageously comprises at least two conductor strips and two separator layers, which are interleaved to form the strip-like article.

[0181] In this manner, the separator strip can keep two conductor strips electrically isolated from each other when they are spirally wound to form a coil for an electrochemical cell.

[0182] It should be noted that in the figures the strips are designated with references N11, N12, N13, N14 for the first strip-like article and with references N21, N22, N23, N24 for the second strip-like article.

[0183] 2 and 3, in some embodiments, each strip-shaped product is wound by a respective winding head. In other words, the first strip-shaped product N1 is preferably wound by the first winding head 11, and the second strip-shaped product N2 is preferably wound by the second winding head 12.

[0184] It should be noted that the coil B1 is produced by winding the first strip-shaped article N1 around the winding axis X1 via the first winding head 11, and the coil B2 is produced by winding the second strip-shaped article around the relative winding axis X2 via the first winding head 11. Preferably, the winding of the strip-shaped articles N1, N2 is carried out by rotation of the respective winding heads 11, 12 around their relative winding axes. However, more complex movements, for example compound movements, may also be provided for the winding depending on the type of coil to be produced.

[0185] 2, in some embodiments, winding axis X1 and winding axis X2 are coaxial and substantially coincident, such that in embodiments that provide for rotation of winding heads 11, 12, they are effectively rotatable about the same axis of rotation.

[0186] More generally, the winding axes of the winding heads may be substantially parallel to one another, in which case it will be clear that the winding heads 11 and 12 can rotate about different, albeit parallel, axes.

[0187] Furthermore, the winding heads 11 and 12 may be configured to grip the strip-like product for winding thereof.

[0188] For this purpose, each winding head 11, 12 can support a relative gripping device (not shown) configured to grip a portion of the respective strip-like article N1, N2.

[0189] Thus, the winding of the strip-like article can be carried out by rotating the gripping device. By gripping the ends or more generally parts of the strip-like article N1, N2 and rotating these ends or parts, it is actually possible to wind the strip-like article, obtaining a spiral structure forming a coil.

[0190] Thus, the winding unit 1 may be configured to rotate each winding head about its respective winding axis X1, X2, for example by a respective motor or by a single motor providing motion to both heads. More generally, the winding unit 1 may be configured to move the winding heads 11, 12 according to a rotational and / or translational motion so as to obtain coils by winding the strip-like product.

[0191] In an alternative embodiment (not shown), the winding unit 1 may comprise an arm that supports the winding head for movement along a working path, which may for example be a closed path along which the winding head moves cyclically.

[0192] Between the two winding heads 11, 12, a separation plane β is advantageously defined which is oriented substantially perpendicular to the winding axes X1, X2.

[0193] Such a plane may, for example, be defined in the interface area between the first winding head 11 and the second winding head 12 in the exemplary embodiment.

[0194] The winding shafts X1 and X2 may be actually constituted by respective shafts. Both ends of each shaft may be rotatably supported by, for example, the support body 41 and the auxiliary support body 13 shown in FIG. 2, respectively. The auxiliary support body 13 may define an intermediate region between the first winding head and the second winding head. A separation interface exists between the two winding heads in the intermediate region, and the separation plane β may be defined at the intermediate region.

[0195] However, it should be noted that an embodiment may also be provided in which the auxiliary support body 13 is not present, and for example, the two winding heads 11, 12 are formed by a single body. In this case, the winding axes coincide, and the two winding heads are aligned along the same axis and extend between the two support bodies 41 on either side. Advantageously, the separation plane β may be arranged to pass along the winding axis in an intermediate region between the two support bodies 41 on either side, preferably corresponding to the centerline. It should also be noted that in an alternative embodiment, a single support body 41 may be present, from which the winding heads extend, for example, in a cantilevered manner. In this case, the separation plane β may pass through a midpoint, preferably corresponding to the centerline, between the end where one winding head is supported by the support body and the opposite end, specifically the end corresponding to the free end, of the other winding head.

[0196] It should also be noted that in this case the two winding heads 11 and 12 may be defined along a single body forming the first strip-shaped article and the second strip-shaped article in the areas where they are wound, respectively.

[0197] Referring again to Figure 3, the separation plane β is generally arranged so that one of the first strip-shaped article N1 and the second strip-shaped article N2 is located on one side of the separation plane β itself and the other is located on the opposite side.

[0198] As will be explained in more detail below, in a preferred embodiment, the first strip-shaped article N1 and the second strip-shaped article N2, and preferably the strips forming them, are always held on one side and the other opposite side of the separation plane β.

[0199] However, it can be assumed that in at least one region this does not occur, so that the strips cross each other or at least partially overlap.

[0200] However, it should be noted that generally, the first strip-shaped article N1 and the second strip-shaped article N2 are held one on one side of the separation plane β and the other on the other side, at least in the first winding head 11 and the second winding head 12.

[0201] As shown in the figures, in some embodiments there may be multiple spooling heads 10 formed, for example, by multiple pairs of first and second spooling heads.

[0202] For example, as shown in Figure 1, there can be six winding heads 10, i.e., three pairs of first and second heads, of which the first pair winds the strip-like product, the second pair is, for example, in a winding position where the produced coil is unwound, and the third pair is in an intermediate position.

[0203] As described above, each of the strip-shaped articles N1 and N2 can be made by combining a plurality of strips.

[0204] In some embodiments, the strip is fed by a special feed device 6. For example, Figure 6 shows an embodiment of a feed device 6, which may be formed by a large coil on which the strip is collected as it unwinds and thus fed during operation of the device.

[0205] Each strip N11, N12, N13, N14, N21, N22, N23, N24 may be delivered by a respective delivery device, or multiple strips may be delivered by a common delivery device.

[0206] In a preferred embodiment as shown in Figures 5 and 6, a base strip M is delivered, which is separated to form a first strip N11 and a second strip N21 intended to form a first strip-shaped item N1 and a second strip-shaped item N2, respectively.

[0207] It should be noted that although a single delivery device 6 from which the base strip M is delivered is shown in the figures, it is possible to envisage as many delivery devices as there are strips forming each strip-like article.

[0208] As shown in FIG. 5, once delivered by the delivery device 6, the base strip M may be directed to at least one separation device 7 configured to separate the base strip M into the two strips mentioned above.

[0209] Preferably, the separation of the base strips is performed so that the first strip N11 and the second strip N21 are separated by a separation plane β.

[0210] A separation plane β can therefore be defined from the point at which the separating device 7 acts to divide the base strip M into two parts.

[0211] Referring again to Figure 4, the strips supplied by the delivery device 6 are fed to a supply unit 2 which is only shown diagrammatically in the figure.

[0212] It should be noted that before being fed to the supply unit 2, the strip may pass through further units, for example for subjecting the strip to preliminary processing. For example, the conductor strip may be subjected to a preliminary cutting or cutting operation so as to form relative outer edges for favoring connection with further conductor portions in the electrochemical cell. In some embodiments, one or more of these preliminary operations may be performed by the separating device 7 itself, if present. In other words, the separating device 7 may be used not only for separating the base strip M, but also for further operations, such as operations in the separation region of the base strip, i.e., on the two opposite faces of the strip once separated.

[0213] Referring again to FIG. 5, it is preferably provided to move the second strip N21 away from the first strip N11 in a direction substantially perpendicular to the direction of advancement a of the strips N11, N21.

[0214] The strips can remain separated by a separation plane β, despite being far from each other.

[0215] The movement away between the two strips can occur both in a direction perpendicular to the separation plane β and in a direction parallel to the separation plane β, or in a combination of these two directions.

[0216] For this purpose, the device 100 may comprise a diverting roller 71 configured to move the second strip N21 away from the first strip N11 in a direction substantially perpendicular to the advancement direction of the strips N11, N21 and preferably substantially parallel to the winding axes X1, X2.

[0217] In some embodiments, the diverting roller 71 is substantially cylindrical and has an axis of rotation inclined relative to a direction substantially perpendicular to the separation plane β by an angle α preferably in the range of 30° to 5°, preferably in the range of 25° to 10°, preferably in the range of 20° to 15°. In some embodiments, the angle α is equal to or less than 30°, preferably 20°, preferably 15°, preferably 10°, preferably 5°.

[0218] It should therefore be noted that a shift of strips, such as strips N11 and N21 in Figures 5 and 6, in a direction substantially perpendicular to the separation plane β can increase the distance d between the two rollers relative to the separation plane β itself.

[0219] Advantageously, this increase in distance allows the strip-shaped articles N1, N2 to be wound at positions spaced apart from each other relative to the winding axis, reducing the risk of interference between the two strip-shaped articles, particularly when the two winding axes are substantially aligned.

[0220] The offset of the strip in a direction substantially parallel to the separation plane can increase the distance h to a plane substantially parallel to the separation plane β itself.

[0221] This feature is useful, for example, in sections of the path where the strips are moved apart relative to the distance d to avoid interference between the strips and better manage the presence of spacer rollers. In this case, the distance h can be reduced again, possibly back to substantially zero, and the two strips can be moved apart according to the distance d, before running side by side.

[0222] Providing a shift of the strips in a direction substantially parallel to the separation plane, i.e., with respect to the distance h, may advantageously also make it possible to reverse the positions of the first strip N11 and the second strip N21, as shown in the exemplary embodiment in Figures 7A and 7B.

[0223] Preferably, there is provided a diverting roller 71A configured to move the strips away and a diverting roller 71B configured to move the strips towards each other.

[0224] Advantageously, diverting roller 71A may be configured to increase distance d and / or distance h. Similarly, diverting roller 71B may be configured to decrease distance d and / or distance h.

[0225] It should be noted that the distance d can be reduced to bring the strips closer together while still keeping them spaced apart, either to flip the strips as in the embodiment of Figures 7A and 7B, or to overlap the strips as in the embodiment of Figures 8A and 8B.

[0226] In some embodiments, such as those shown in Figures 8A and 8B, a reduction in the distance d may in fact be used to obtain at least a partial overlap of the strips.

[0227] As shown in the figure, the strips overlap each other and can be wound onto a single winding head, or onto two coplanar winding heads that are parallel but perpendicular to the winding axis.

[0228] However, it should be noted that partial overlap of the strips may be provided, for example to allow processing to include both edges of each strip.

[0229] Referring again to Figures 1 and 4, in a preferred embodiment, the supply unit 2 feeds the individual strips N11, N12, N13, N14 and the individual strips N21, N22, N23, N24 of each group towards the winding unit 1, where they converge towards the respective winding heads.

[0230] The strips N11, N12, N13, N14 and each group of strips N21, N22, N23, N24 can be combined in the supply unit 2 to form strip-like articles N1, N2 that are wound up to make coils.

[0231] 1, for this purpose, the strips N11, N12, N13, N14 are advanced along different directions, indicated by the reference signs f1, f2, f3, f4, so as to converge towards a combining roller 20 where the rollers are combined, and at least one strip is partially wound up so that downstream of this strip there is a single multi-layer structure forming the strip-like article N1. A similar solution can be provided for the strips N21, N22, N23, N24. The strips N21, N22, N23, N24 can thus converge towards the respective combining roller 20, which can be formed as a single body relative to the roller 20 where the strips N11, N12, N13, N14 converge.

[0232] In some embodiments, bonding roller 20 is not present and the strips are bonded directly to each other on their respective winding heads.

[0233] Preferably, the strip is fed continuously to the feed unit 2 .

[0234] In other words, each strip, or possibly one or more of the aforementioned strips, is fed into the feeding unit 2 without stopping once and proceeds at a speed greater than zero, preferably at a substantially constant speed.

[0235] It should also be noted that in some embodiments, one or more of the strips N11, N12, N13, N14, N21, N22, N23, N24 may be slowed down or stopped while moving towards the combining roller 20, or more generally towards the winding unit 1.

[0236] This slowing or stopping may be accomplished by a strip holding device configured to slow or stop the feeding of the strip where it is desired to slow or stop.

[0237] The holding device 5 may be associated with an accumulation device (not shown) configured to accumulate the quantity of strips if the supply is continuous.

[0238] In other words, the operation of the accumulator can be coordinated with the operation of the holding device 5 so that the accumulator accumulates the strip when the holding device slows or stops feeding the strip.

[0239] For example, in some embodiments, in order to slow down the movement of the portions of the strip, grippers 51, 52 or other similar holding elements may be provided, which act on the respective strip at the moment when stopping or slowing down is required.

[0240] Advantageously, the grippers 51, 52 may be movable so as to control their movement and thereby adjust the relative strip advancement speed.

[0241] The holding device may also be associated with a cutting device (not shown) which cuts one of the strips to cause a break in the continuity of the strip within the strip-like article if necessary. It will be understood that there may be two cutting devices, each associated with a relative holding device and therefore a relative strip-like article, or one cutting device responsible for cutting both strip-like articles.

[0242] The device of the present invention further comprises a moving device 3 for moving the winding head 10 .

[0243] Preferably, the movement device 3 is configured to move the first 11 and second 12 winding heads according to at least one translation and / or rotation about an axis different from the winding axes X1, X2.

[0244] In some embodiments, the winding heads 11, 12 are preferably alternately translated along the displacement direction during the winding of the strip-like articles N1, N2, or more generally during the production of the coils.

[0245] Preferably, possibly in combination with the above-mentioned translation, the winding heads 11, 12 rotate about a further axis of rotation different from the winding axes X1, X2.

[0246] Such rotation may be, for example, a rotation about an axis C substantially parallel to the winding axes X1, X2, and may be performed after the strip-like article has been wound in order to displace the coil from the position where winding takes place to another position, for example an unwinding position.

[0247] In some embodiments, a mechanical connection 40 may be provided that is configured to interconnect the first and second spooling heads so as to effect the above-described movements substantially simultaneously.

[0248] However, it should be noted that more generally, interconnection devices 4 may be provided that are of a different type than a purely mechanical connection, for example of an electronic or electromechanical type.

[0249] Additionally, the interconnection device 4 may be configured to provide sequential movement of the two heads in a predetermined order and speed, instead of or in combination with substantially simultaneous movement. For example, the first spooling head 11 may be moved, and once the first spooling head movement is complete, the interconnection device 4 may cause the second spooling head 12 to move.

[0250] As shown in the embodiment of FIG. 1, the mechanical connection 40 preferably comprises a support body 41 rotatable about an axis C, configured to rotatably support the winding head 10 .

[0251] Furthermore, the rotatable body 41 is advantageously movable not only around its axis of rotation C but also in a displacement direction, along which the rotatable body 41, and in general the displacement device 3, can be displaced.

[0252] In other words, in this case, in addition to rotating by itself to wind up the strip-shaped items N1, N2, the moving head 10 may also displace in accordance with the movement of the rotating body of the moving device 3, preferably its linear displacement.

[0253] To this end, in some embodiments, the support body 41 is supported by a frame structure 42 and is rotatably connected to this frame structure 42 .

[0254] The frame structure 42 may be movable, for example, by performing the translational motion described above.

[0255] In a preferred embodiment, the movable frame structure 42 also supports the coupling rollers 20, the holding device 5, and the cutting device, if one or more are present, so that they can also move with the frame structure 42.

[0256] Although in the illustrated embodiment the support body 41 allows the winding heads to rotate simultaneously and the frame structure 42 allows them to translate, the interconnection device 4 may generally be configured to provide different combinations of winding head movements. In particular, in accordance with what has been described above, the winding heads may be configured to simultaneously or sequentially perform one or more of the following: rotation about their respective winding axes X1, X2; translation; and rotation about a rotation axis different from the winding axes X1, X2.

[0257] These movements can also combine rotational and translational movements.

[0258] For example, in the above-described embodiment in which the spooling head is supported on an arm, such translation and / or rotation about an axis different from the spooling axis may be achieved by movement of the arm. Of course, it may also be provided that the spooling head rotates about the relative spooling axis while moving along the working path defined by the translation / further rotation.

[0259] In this way, winding can occur while the winding head is moving, similar to the movement of the frame structure 42 that occurs in the illustrated embodiment.

[0260] It should also be noted that if the winding head is supported on an arm, it may be provided so that the distance between two successive feed heads along its working path is variable: for example, the two winding heads may be moved towards each other to cut the strip-like article at the end of the winding of the coil, and moved away from each other while the strip-like article is being wound.

[0261] Of course, those skilled in the art can make further modifications and variations to meet the needs of specific and fortuitous applications without departing from the scope of protection defined by the appended claims.

Claims

1. An apparatus (100) for making coils for electrochemical cells, preferably intended for the manufacture of batteries, comprising: a supply unit (2) configured to supply at least one first strip-shaped article (N1) intended to form a first coil (B1) and a second strip-shaped article (N2) intended to form a second coil (B2); a winding unit (1) comprising a plurality of winding heads (10), the plurality of winding heads (10) including at least one first winding head (11) configured to wind the first strip-shaped product (N1) and a second winding head (12) configured to wind the second strip-shaped product (N2), the first winding head (11) and the second winding head (12) respectively defining winding axes (X1, X2) substantially parallel to each other; at least one moving device (3) for the winding head (10), configured to move the first winding head (11) and the second winding head (12); Equipped with the winding unit (1) is configured to define a separation plane (β), the separation plane (β) being substantially perpendicular to the winding axes (X1, X2), and the separation plane (β) being arranged such that, at least in the first winding head (11) and the second winding head (12), one of the first strip-shaped article (N1) and the second strip-shaped article (N2) is located on one side of the separation plane (β) and the other of the first strip-shaped article (N1) and the second strip-shaped article (N2) is located on the opposite side thereof; Device.

2. 2. The device according to claim 1, wherein the winding axis (X1) of the first winding head (11) and the winding axis (X2) of the second winding head (12) are substantially coaxial.

3. 3. Apparatus according to claim 1 or 2, wherein each of the winding heads (10) is configured to rotate about the axis of a respective one of the winding axes (X1, X2).

4. 4. The device according to claim 3, wherein the winding unit (1) is configured to rotate the winding heads (10) respectively around the axes of the winding axes (X1, X2).

5. 5. Apparatus according to claim 4, wherein the moving device (3) is configured to move the first winding head (11) and the second winding head (12) according to at least one translation and / or rotation about a further rotation axis different from the winding axes (X1, X2), the at least one translation and / or rotation preferably being performed while winding the first strip-shaped product (N1) and / or the second strip-shaped product (N2).

6. 6. Apparatus according to claim 5, comprising an interconnection device (4) for interconnecting said first winding head (11) and said second winding head (12).

7. The interconnection device (4) is configured such that the first winding head (11) and the second winding head (12) rotation about each of said winding axes (X1, X2); Translation, and rotation about a further axis of rotation different from said winding axis (X1, X2), configured to at least partially substantially simultaneously perform one or more of:

7. The apparatus of claim 6.

8. 8. The apparatus according to claim 7, wherein the winding unit (1) is configured such that the first winding head (11) and the second winding head (12) substantially simultaneously wind the first strip-shaped product (N1) and the second strip-shaped product (N2), respectively, at least partially substantially simultaneously.

9. The interconnection device (4) is configured so that the first winding head (11) is followed by the second winding head (12) in a predetermined sequence: rotation about each of said winding axes (X1, X2); Translation, and rotation about a further axis of rotation different from said winding axis (X1, X2), configured to perform one or more of:

7. The apparatus of claim 6.

10. The device according to any one of claims 7 to 9, wherein the interconnection device (4) comprises a mechanical connection (40).

11. 11. The device according to claim 10, wherein the mechanical connection (40) comprises a support body (41) configured to rotatably support the winding head (10).

12. 12. Apparatus according to claim 11, wherein the support body (41) is rotatable about an axis of rotation (C) substantially parallel to the winding axes (X1, X2).

13. The device according to any one of claims 10 to 12, wherein the mechanical connection (40) comprises a frame structure (42) supporting the winding head (10).

14. 14. Apparatus according to claim 13 when dependent on claim 11, wherein the support body (41) is rotatably connected to the frame structure (42), and the winding head (10) is supported on the frame structure (42) by the support body (41).

15. 15. Apparatus according to claim 13 or 14, wherein the frame structure (42) is movable.

16. 16. Apparatus according to claim 15, wherein the frame structure (42) is configured to move according to an alternating motion, preferably according to a translation along a translation axis.

17. The apparatus of claim 16 , wherein the translation is substantially horizontal.

18. 18. The apparatus according to any one of claims 1 to 17, further comprising at least one delivery device (6) configured to deliver a base strip (M) and at least one separation device (7) configured to separate the base strip (M) to form a first strip (N11) and a second strip (N21) intended to form the first strip-shaped item (N1) and the second strip-shaped item (N2), respectively.

19. 19. The device according to claim 18, wherein the first strip (N11) and the second strip (N21) are separated by the separation plane (β).

20. 20. The device according to claim 19, comprising a diverting roller (71) configured to move the second strip (N21) away from the first strip (N11) in a direction substantially perpendicular to the direction of advancement of the strips (N11, N21), preferably substantially parallel to the winding axis (X1, X2).

21. An apparatus according to any one of the preceding claims, comprising four winding heads (10), preferably six winding heads (10).

22. 1. A method for making a coil for an electrochemical cell, preferably intended for the manufacture of a battery, comprising the steps of: Providing a first strip-shaped product (N1) and a second strip-shaped product (N2); - winding the first strip-shaped product (N1) to form a first coil (B1) and the second strip-shaped product (N2) to form a second coil (B2), wherein the first strip-shaped product (N1) and the second strip-shaped product (N2) are wound around winding axes (X1, X2) that are substantially parallel to each other; Including, the first strip-shaped product (N1) and the second strip-shaped product (N2) are separated by a separation plane (β) at least during winding, the separation plane (β) being substantially perpendicular to the winding axis (X1, X2); method.

23. 23. The method according to claim 22, wherein the first strip-like product (N1) is wound by a first winding head (11) and the second strip-like product (N2) is wound by a second winding head (12).

24. 24. The method according to claim 23, comprising interconnecting the first and second winding heads (11, 12) so that they move substantially simultaneously or so that the first winding head (11) is followed by the second winding head (12) according to a predetermined sequence.

25. 25. The method according to claim 24, wherein the substantially simultaneous movement of the first winding head (11) and the second winding head (12), or the movement of the first winding head (11) followed by the second winding head (12) according to a predetermined sequence, comprises one or more of: rotating the winding head (10) about the respective winding axis (X1, X2), translating the winding head (10), and rotating the winding head (10) about a further rotation axis different from the winding axis (X1, X2).

26. 26. The method according to claim 25, wherein the winding head (10) is translated and / or rotated about a further axis of rotation different from the winding axis (X1, X2) while winding the first strip-shaped product (N1) and the second strip-shaped product (N2).

27. 27. The method according to any one of claims 22 to 26, wherein the winding axis (X1) of the first winding head (11) and the winding axis (X2) of the second winding head (12) are substantially coaxial.

28. 28. The method according to any one of claims 22 to 27, wherein the further axis of rotation different from the winding axis (X1, X2) is an axis (C) substantially parallel to the winding axis (X1, X2).

29. 29. The method according to any one of claims 22 to 28, wherein moving the first winding head (11) and the second winding head (12) substantially simultaneously or moving the first winding head (11) followed by the second winding head (12) according to a predetermined sequence comprises moving the first winding head (11) and the second winding head (12) in an alternating motion.

30. A method according to any one of claims 22 to 29, wherein the alternating movement comprises translation along a preferably substantially horizontal translation axis.

31. A method according to any one of claims 22 to 30, comprising delivering a base strip (M) and separating said base strip (M) to form first strips (N11) and second strips (N21) intended to form said first strip-like item (N1) and said second strip-like item (N2), respectively.

32. 32. A method according to claim 31, comprising moving the second strip (N21) away from the first strip (N11) in a direction substantially perpendicular to the direction of advancement of the strips (N11, N21) so that the first strip (N11) and the second strip (N21) are separated by a separation plane (β).

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