Apparatus and method for creating an internal assembly, preferably for an electrochemical cell intended for producing batteries

Abstract

An apparatus (100) for making an internal assembly (3) of an electrochemical cell intended for producing batteries, comprising a dispensing unit (200) for a strip (80) along a predefined feed path (PA) with a predefined feed rate (VA), an alignment system (405') positioned along said feed path (PA), wherein said alignment system (405') comprises a first differential feed unit (410a') comprising a first differential feed roller (411a') and a second differential feed roller (412a'), rotatable, wherein said first and second differential feed roller (411a', 412a') are configured in such a way that the projection on the strip (80) of at least one of the respective geometric centres (411aC', 412aC') of said first and second interaction portions (411aInt', 412aInt') is at a first distance (Di1) other than zero from a longitudinal median (mL) of said strip (80), and wherein at least one of said first and second differential feed rollers (411'a, 412'a) is selectively actuatable in rotation so as to align said strip (80) with said predefined feed path (PA).

Description

[0001] DESCRIPTION

[0002] "APPARATUS AND METHOD FOR CREATING AN INTERNAL ASSEMBLY, PREFERABLY FOR AN ELECTROCHEMICAL CELL INTENDED FOR PRODUCING BATTERIES"

[0003] The present invention relates to an apparatus and a method for creating an internal assembly, e.g. obtained as a coil of the type formed by winding a stripshaped article including a strip or a plurality of overlapping strips.

[0004] The invention also directed to a method for making the internal assembly itself.

[0005] The present invention finds a preferred, though not exclusive, application in the field of electrochemical cell production, for the manufacture of which, for example, a winding of a strip-shaped article or a stacking of a heterogeneous multilayer structure can be used.

[0006] In fact, in the relevant technical field, it is known to combine electrically conductor and electrically separator elements in layers in order to form an elaborate and functional structure of anodes and cathodes. The article made by overlapping the above-mentioned layers can thus be advantageously wound in coil form or coupled with layers in flat or other configurations, and thus be efficiently implemented for creating the desired electrochemical cell.

[0007] In the present disclosure, as well as in the accompanying claims, certain terms and expressions are deemed to assume, unless otherwise expressly indicated, the meaning expressed in the following definitions.

[0008] The term "internal assembly" of an electrochemical cell generically refers to the structure in which the conductor elements and the separator elements are combined within the electrochemical cell. Such a structure may be a substantially flat layered structure alternating on top of each other (achieved by means of stacking or Z-folding techniques) or it may be a coil structure formed by the spiral winding of conductor and separator strips alternating with each other.

[0009] The term "separator element" refers to a material that has the ability to isolate two further materials when interposed between them. More preferably, a separator element in this context is an electrically insulating material.

[0010] The term "separator strip" refers to a "separator element" with an substantially strip-shaped form. Thus, in this context, the term "separator strip" generally refers to a strip-shaped element that has the ability to isolate two materials when interposed between them. More preferably, a separator strip in this context is an electrically insulating material.

[0011] Consistently with what has been described above, the term "conductor element" identifies a material that has the ability to conduct a current, e.g. electric current, without dispersing it significantly.

[0012] Similar to the previous arguments, the term "conductor strip" refers to a "conductor element" with an substantially strip-shaped form.

[0013] For a more complete description, it should be noted that in this document, the term "strip" (or "strip-shaped article") refers to any solid product which, within an industrial production line, is in an elongated form, i.e. having a longitudinal extension significantly greater than its transverse extension.

[0014] It is interesting to note that the strip (or "strip-shaped article") can be composed of homogeneous or heterogeneous material and can be formed by a single layer or by the superimposition of several layers.

[0015] The strip also has characteristics that allow a certain flexing during its advancing along a relative production line.

[0016] Again, according to the present context, the strip (or strip-shaped article) can for example be made by overlapping conductor and insulating layers alternated with each other and be intended to form a sandwich to be wound for making a coil intended for the production of electrochemical cells.

[0017] The term "winding" is intended to mean making a spiral structure by rotation of a strip, a ribbon or more generally a strip-shaped article about an axis, a flat surface or another structure. By winding, the strip-shaped article will form one or more turns about the axis or the structure.

[0018] The term "coil" is intended to mean any spiral structure formed by winding a strip, ribbon or more generally a strip-shaped article about an axis, a flat surface or another winding structure. Depending on the structure about which the stripshaped article is wound, the overall shape of the coil may be substantially cylindrical rather than crushed or otherwise shaped.

[0019] As mentioned above, the coil can be applied not only in the electrochemical cell sector but also in other sectors, such as for example in the capacitor sector, within which coil-shaped structures can likewise be used.

[0020] The term "closed path" is intended to mean a path along which a winding head or other element travels in which the starting point and the end point of the path substantially coincide.

[0021] The term "continuous" referred to an expression of motion, is intended to mean an operation that takes place without interruption, without there being a stop or an interruption in the operation in question. In particular, with reference to the movement of a strip or of other element, the term "continuous" indicates that the strip, or a portion thereof, is never stopped during its movement.

[0022] The term "substantially constant" referred to a measure or quantity, such as for example the speed of displacement of an object, is intended to mean that said measure or quantity maintains, over time, a value which preferably varies by a maximum of ±10%, preferably by a maximum of ±5%, preferably by a maximum of ±2%.

[0023] Similar to the above, the terms "substantially parallel" or "substantially perpendicular" are used to identify a configuration between two geometric or physical elements (e.g. two lines, two segments, two planes, etc.) that respectively satisfies the condition of parallelism or perpendicularity with a tolerance of ± 5°. Furthermore, the condition of parallelism or perpendicularity between two geometric or physical elements is also understood to be fulfilled when there is no pure translation of one element with respect to another.

[0024] In this context, the term "predefined feed path" identifies a path that an element (e.g. the strip-shaped separator element) would have to follow if the machining process were to work completely correctly.

[0025] In reality, it is often the case that the actual feed path that the element follows may differ from the predefined feed path for various reasons such as, for example, compositional irregularities or discontinuities in the element that deform in an unpredictable manner, wear zones in the guide devices of the element that change the application of forces and constraints from what was theoretically modelled, etc.

[0026] An "alignment operation" takes place when the actual feed path is substantially overlapped with the predefined feed path. Further, in the present context, the term "reference portion" is used to identify a part of an element (e.g. the edge of the strip acting as a separator element) whose position and orientation is used to define a possible difference in alignment between the predefined feed path and the actual feed path. Similarly, the term "reference" is used when related to the apparatus or a device included in it in order to identify at least one spatially constant point against which the difference in alignment of the aforementioned reference portion can be assessed.

[0027] Said alignment, therefore, is preferably achieved by bringing the reference portion in substantial overlap with the reference of the apparatus.

[0028] The term "intersects" refers to a condition whereby a first element has at least one of its points in common with a second element that intersects it. This condition is particularly evident and understandable when considering projections on the same plane of several intersecting elements.

[0029] The term "integral" referred to the movement of two or more elements, is intended to mean that these elements perform substantially the same movement and substantially simultaneously. In other words, two integral elements move together, as a single body, although they are not necessarily joined or constrained to each other. It can in fact be provided that the respective systems of movement of the two elements are coordinated in such a way as to move, when necessary, the two elements together. Furthermore, it may be provided for the use of a temporary constraint between the two elements which, for example, joins them to each other in some steps, causing them to move together, and separates them again, making them movable independently of each other.

[0030] It should also be specified that the expression "to displace an object between a first position and a second position" is intended to mean both the displacement from the first position to the second position and the displacement from the second position to the first position.

[0031] This definition applies in an analogous way to similar expressions of motion, such as for example to transfer or to move a generic object between two positions or between two zones or even between two different operating configurations.

[0032] In this context, the term "distance" between two elements, e.g. A and B, refers to the minimum distance that can be defined by considering all points of A and all points of B. In this sense, therefore, a distance between two elements is identified between their mutually most proximal points. In this context, the term "kinematically independent" is intended to mean two or more systems that are able to perform movements completely independently and separately. In other words, kinematically independent systems or devices are configured in such a way that they can carry out their intended movements without changing the position of other involved systems. It is also significant to understand that this condition of kinematic independence does not exclude that different systems or devices can cooperate and / or transfer material to each other along common and substantially overlapping segments of space.

[0033] It is further important to note that this condition of kinematic independence does not exclude that parts different and directly independent from each other have a common driving origin. In this sense, kinematically independent systems could be moved, for example, by a same drive shaft by means of different types of drive connections, while still realising their own motions that do not directly influence each other.

[0034] The term "movable" refers to portions or devices provided with the ability to move through space. It is relevant to note that these portions or devices can be movable both because they are provided with their own means of displacement ad because they are constrained to further portions configured with displacement abilities.

[0035] The terms "upstream" and "downstream" indicate operating steps that have their own specific position in the sequencing of a process.

[0036] More specifically, if operation B occurs upstream of operation A, it means that operation B will occur sequentially before said operation A.

[0037] Similarly, if operation B occurs downstream of operation A, it means that operation B will occur sequentially after said operation A.

[0038] These considerations for operating steps also apply to devices and / or portions that are positioned respectively upstream or downstream of others according to the sequential operating flow of the process considered and described.

[0039] The terms "vertical" and "horizontal" have in this context the meaning they generally have in common parlance whereby, for example, the supporting plane is horizontal and the plane perpendicular to it is vertical. In this sense, the terms "upper" and "lower" refer to different vertically spaced-apart positions and serve primarily to distinguish different elements or faces in a practical manner, but do not in any way have a limiting sense of description.

[0040] In this context, the term "in absolute value" referred to, for example, an angle of rotation (e.g. 45°) is understood to mean both an angle of rotation in a first direction (positive, +45°) equal to the indicated value and in a second direction (negative, -45°), opposite to the first, equal to the indicated value.

[0041] For greater clarity, by way of example, a clockwise rotation produced according to said angle of rotation is identified as being produced according to the first positive direction of rotation, and therefore the corresponding angle will be reported with a value greater than zero (e.g. +45°).

[0042] Consistently, a negative value of the angle of rotation indicates a rotation that occurs in a counter-clockwise direction.

[0043] The term "as complimentary" is intended to mean a configuration of a spatial element (e.g. surface) such as to fill the space not occupied by a reference element.

[0044] In particular, if a spatial surface is configured as complimentary with a reference surface, it is shaped in such a way as to substantially follow the profile of the reference surface by occupying a space not occupied by the reference surface at least in one of its surroundings. By way of non-limiting example, a spatial element configured as complimentary with a reference element with a conical extension can be made as a recess with a substantially funnel-shaped section.

[0045] The term "to interact" is intended to mean a condition that allows one to actively intervene by changing certain conditions or configurations in which an element is acting.

[0046] For example, the expression "a folding unit interposed between said dispensing unit and said winding unit and configured to interact with said strip along said feed path" is intended to mean that said folding unit is able to actively modify and define the spatial extension of the strip feed path, in particular by determining a first curved folding tract.

[0047] The term "rod" refers to an element having a solid or hollow three-dimensional body preferably developed along a main axis, which may be slab-shaped, linear, double plate, circular, 'C'-shaped, 'H'-shaped or similar. In this context, the term "rod" can be regarded as similar to "bar". The term "slab-shaped" refers to an object having a slab-like shape, i.e. having a parallelepiped body with a prevailing longitudinal development (i.e. length) and a thickness, measured perpendicular to the longitudinal development, much less than the length. This slab comprises two substantially planar, parallel and opposite surfaces.

[0048] In this context, the term "geometric centre" means a centre defined according to the shape of the element to which it refers. It is interesting to note that this geometric centre coincides with the barycentre in the case where the material of which the element is composed is homogeneous, while it differs in the case where there is heterogeneity within the element itself.

[0049] In this context, the term "asymmetrical" identifies a geometric condition that does not satisfy at least one symmetry operator (e.g. a rotation axis, a plane of symmetry, a centre of inversion, etc.). In this sense, the expression "an asymmetrical feeding the strip rate with respect to the longitudinal median" identifies a feed rate that is applied to the strip unevenly with respect to its longitudinal median. In more detail, it will, for example, be possible for a first local portion of the strip to be accelerated with a first speed while a second local portion of the strip, specularly identified on the opposite side of the longitudinal median of the strip, is accelerated with a second speed different from the first, thus producing a rotation of the strip.

[0050] The Applicant, in the context of the constant need to increase the performance and efficiency of its production processes, has preliminarily observed how, in a production line for an internal assembly of electrochemical cells (whether of the "stacking" or "z-folding" type or of the coil-winding type), the feed speed of the strip (or portions thereof), with respect to the unit that carries out the coupling, can constitute an important element of limitation of the production capacity of the line itself.

[0051] Furthermore, this limitation is even more critical if high precision is required in the formation of the assembly. In particular, the Applicant noted that in many applications, such as, for example, in the winding of a strip in the form of a coil for the production of electrochemical cells, a high degree of precision in the geometry of the couplings of the different materials used must be ensured in order to guarantee the required performance of the finished product.

[0052] At the same time, the Applicant has noted that the steps of interrupting and resuming feeding the strip produce undesirable reductions in the production efficiency of the process together with increased wear of the moving parts which are subjected to increased acceleration and deceleration in order to try to compensate for these negative variations in productivity.

[0053] Even more so, the Applicant noted that such interruption and resumption of feeding the strip can, in addition to increased wear and tear and thus reduced life expectancy of a device, imply misalignments related to these process discontinuities.

[0054] Analysing this aspect in detail and further elaborating on it, the Applicant noted that the alignment devices generally used tend to have strip displacement systems that allow the strip to be moved in translation with respect to a predefined feed path.

[0055] Furthermore, the Applicant noted that this operating condition of the alignment group tends to result in a local variation of the orientation of the strip, but this may be limited to small actual changes in the strip travel path.

[0056] In fact, it is often the case that a local correction of the alignment of the strip must be produced in order to produce a change in orientation for a longitudinally extended section of the strip.

[0057] This situation can also produce unwanted strip deformations linked to a mainly local alignment correction process.

[0058] The Applicant further noted that particularly when a cut is made and a new end of the strip is created, it is significantly advantageous to increase the security with which to control and convey this free portion to the winding head precisely and effectively.

[0059] In fact, the Applicant has noticed that when subjected to high speeds of movement in different feed directions, these free ends have the possibility of flexing and losing the ideal alignment that they generally follow during other processing steps.

[0060] The Applicant therefore perceived how it was possible to adopt a different approach from the prior art by attempting to extend the alignment variation over a larger section of the strip while ensuring high precision and efficiency of coupling of the strip during the different steps of the process for making the coil, specifically considering the operational condition of also having to handle free ends subject to possible flexing.

[0061] The Applicant therefore found that realising an alignment unit capable of modifying the way the strip was aligned while ensuring a high degree of accuracy and process reproducibility compared to the prior art conferred the possibility of improving the overall efficiency of the process for creating a battery.

[0062] In a first aspect thereof, therefore, the present invention is directed an apparatus for creating a coil, preferably for an electrochemical cell intended for producing batteries.

[0063] Preferably, said apparatus comprises a dispensing unit configured to dispense at least one strip along a predefined feed path.

[0064] Preferably, said strip is dispensed along said predefined feed path with a predefined feed rate.

[0065] Preferably, such an apparatus comprises an alignment system positioned along said feed path.

[0066] Preferably, said alignment system comprises a first differential feed unit comprising a first differential feed roller and a second differential feed roller.

[0067] Preferably, said first and second differential feed rollers are rotatable about a first rotation axis and a second rotation axis, respectively, which are substantially parallel to each other.

[0068] Preferably, said first and second rotation axis are substantially perpendicular to said feed path.

[0069] Preferably, said first and second differential feed rollers are configured to make said strip pass in the space defined between them so as to engage said strip on opposite sides at a first interaction portion of said first differential feed roller and at a second interaction portion of said second differential feed roller.

[0070] Preferably, said first and second differential feed rollers are configured so that the projection on the strip, when in use, of at least one of the respective geometric centres of said first and second interaction portions is at a first distance other than zero from a longitudinal median of said strip. Preferably, at least one of said first and second differential feed rollers is selectively actuatable in rotation so as to align said strip to said predefined feed path.

[0071] Preferably, said second differential feed roller can be displaced towards and away from the respective first differential feed roller by means of a respective actuator.

[0072] In this way, the Applicant noted that it is advantageously possible to displace the second roller to adapt different strip formats while facilitating the passage of the strip, particularly when there is an initial end that may be subject to unwanted flexing or curvature.

[0073] In addition, thanks to this technical solution it is possible to create an alignment unit capable of producing precise and accurate variations in the alignment of the strip with respect to the predefined feed path.

[0074] More specifically, thanks to this technical solution, the Applicant was able to selectively detect and guide even potentially flexible ends of the strip between the first and second differential feed rollers by advancing the strip asymmetrically so as to induce a rotation of the feed direction. In this way, the Applicant was able to realise an innovative technical solution that does not act locally on the strip, but produces an angular variation of the actual feed path over greater distances than taught by the prior art.

[0075] In a second aspect thereof, the present invention is directed to a method for aligning a strip, the latter intended for creating an internal assembly of an electrochemical cell for producing batteries.

[0076] Preferably, said method comprise dispensing said strip along a feed path at a feed rate.

[0077] Preferably, said method comprise arranging an alignment system for said strip which comprises a first differential feed unit.

[0078] Preferably, said first feed unit comprises a first and a second differential feed roller.

[0079] Preferably, said first and second differential feed rollers are configured to make said strip pass in the space defined between them so as to engage said strip on opposite sides at a first interaction portion of said first differential feed roller and at a second interaction portion of said second differential feed roller. Preferably, said first differential feed roller is selectively actuatable in rotation so as to align said strip to said predefined feed path.

[0080] Preferably, said second differential feed roller can be displaced towards and away from the respective first differential feed roller by means of a respective actuator.

[0081] Preferably, said strip comprises identifying an alignment difference between said strip and said feed path.

[0082] Preferably, in the case where said difference in alignment is other than zero said method comprises aligning said strip and said feed path by actuating said first differential feed unit so as to produce a first local difference of said feed rate asymmetrical with respect to the longitudinal median of said strip so as to accelerate or slow down a first local portion of said strip with respect to a second local portion of said strip.

[0083] Preferably, said second local portion of said strip is identified on the opposite side from said longitudinal median of said first local portion of said strip.

[0084] Thanks to this technical solution, it is possible to achieve the same benefits of the invention as described with regard to its first aspect.

[0085] The present invention, in at least one of the aforesaid aspects, may have at least one of the further preferred features set forth below.

[0086] Preferably, at least one of said first and second differential feed rollers is selectively actuatable in rotation to produce a first local difference of said feed rate of said strip so as to displace said strip along a transverse direction with respect to said predefined feed path so as to align said strip with said predefined feed path.

[0087] This results in a local difference in feed rate produced by rotating the first or second roller at a speed such as to impose on the portion of the strip engaged by the first or second interaction portion, a speed other than feed rate.

[0088] This makes it possible to align the strip to the predefined feed path.

[0089] Preferably, said first local difference of said feeding the strip rate is applied so as to displace said strip along a transverse direction with respect to said predefined feed path that is parallel to said first or second rotation axis. Preferably, said alignment system comprises a second differential feed unit comprising a third and a fourth differential feed rollers, respectively rotatable about a third and a fourth axes which are parallel to each other and substantially perpendicular to said feed path and positioned on the opposite side, with respect to said longitudinal median, to said first and second differential feed rollers.

[0090] Preferably, said third and fourth differential feed rollers are configured to make said strip pass in the space defined between them so as to engage said strip on opposite sides at a third interaction portion of said third differential feed roller and at a fourth interaction portion of said fourth differential feed roller.

[0091] Preferably, said third and fourth differential feed rollers are configured so that the projection on the strip, when in use, of at least one of the respective geometric centres of said third and fourth interaction portions is at a second distance from said longitudinal median other than zero.

[0092] Preferably, at least one of said third and fourth differential feed rollers is selectively actuatable in rotation to produce a second local difference of said feed rate of said strip.

[0093] In this way, the alignment effect is advantageously further increased.

[0094] According to one embodiment, the second differential feed unit can be idle.

[0095] Thanks to this technical solution, the strip can be guided in an improved manner while being rotated by means of the first differential feed unit.

[0096] Preferably, said second local difference is different from said first local difference.

[0097] This further emphasises the desired alignment.

[0098] Preferably, said strip comprises a first longitudinal edge and a second longitudinal edge.

[0099] Preferably, said first and second interaction portions of said first and second differential feed rollers have an extension substantially between said first edge and said longitudinal median of said strip, and / or said third and fourth interaction portions of said third and fourth differential feed rollers have a longitudinal extension substantially between said second edge and said longitudinal median of said strip. In this way it is possible to realise the alignment of the strip by rotation about a rotation axis perpendicular to the first and second rotation axis of the strips. Furthermore, it is understandable to the person skilled in the art that the smaller and closer to the edge the interaction portion is, the greater the displacement of the strip.

[0100] In fact, the pulling action that the rotating roller performs is not mediated over an extended section of strip but maintains a more local nature.

[0101] Preferably, said first and second rotation axes coincide with said third and fourth rotation axes respectively.

[0102] In this way, a compact alignment system can be easily realised.

[0103] Preferably, said first and second interaction portions are symmetrical with respect to said longitudinal median to said third and fourth interaction portions

[0104] This makes it possible to create a compact, efficient alignment system that is able to simply and quickly apply symmetrical changes in orientation of the strip.

[0105] Preferably, said first and second interaction portions and / or said third and fourth interaction portions extend substantially respectively from said first edge and / or said second edge for about , more preferably about 1 / 3, of the distance between said first edge and / or said second edge and said longitudinal median.

[0106] The Applicant noted that this provides an interesting balance between imposing the differential feed on the strip in a limited lateral portion and having a sufficiently large gripping on the strip to effectively rotate it.

[0107] Preferably, said alignment system comprises a sensor to detect a misalignment of said strip with respect to said feed path.

[0108] Thanks to this solution, it is possible to precisely, quickly and uniformly quantify the amount of misalignment, if any, to be corrected.

[0109] Preferably, said sensor is an optical or laser sensor.

[0110] In this way, the benefits described above can be produced in a cost-effective and efficient manner. Preferably, said apparatus comprises a coupling unit, configured to combine a plurality of conductor elements and at least one separator element in a predefined structure, so as to form said internal assembly of an electrochemical cell.

[0111] Preferably, said strip is at least one of said conductor elements and said at least one separator element.

[0112] Preferably, said apparatus comprises a supply unit of said coupling unit, placed downstream of said dispensing unit, comprising said alignment system of the strip.

[0113] In this way, the desired internal assembly can be realised precisely.

[0114] Preferably, said one supply unit comprises a movable portion configured to reversibly displace along a displacement direction between a first configuration distal to said dispensing unit and a second configuration proximal to said dispensing unit.

[0115] Preferably, said movable portion comprises said alignment system.

[0116] This makes it possible to obtain a coupling of the strip wherein the alignment is continuously checked and corrected even during the steps in which the movable portion displaces itself to avoid interruption in feeding the strip.

[0117] Thanks this technical solution, it is therefore possible to further improve the process of continuously feeding and coupling of the strip by correcting any misalignment even while the movable portion is in action.

[0118] Preferably, said alignment system is positioned immediately upstream of said coupling unit.

[0119] In this way, any misalignment can be checked and corrected just before the coupling of the materials so that a more precise internal assembly can be produced.

[0120] Preferably, said strip is a separator strip.

[0121] Preferably, said internal assembly of said electrochemical cell is a structure formed by a stack of conductor foils individually separated by said separator strip.

[0122] Preferably, said coupling unit is a stacking unit of said conductor foils separated by said separator strip. Preferably, said supply unit comprises said alignment system for said separator strip.

[0123] In this way, an internal assembly in the form of a multilayer stacked structure for prismatic batteries can be precisely and efficiently realised.

[0124] According to another embodiment, said strip is at least one of a plurality of strips comprising a pair of conductor strips and a pair of separator strips.

[0125] Preferably, said internal assembly of said electrochemical cell consists of a coil formed by said conductor strips and said separator strips wound together.

[0126] Preferably, said one coupling unit is a winding unit of said conductor strips and said separator strips.

[0127] Preferably, said supply unit comprises said alignment system for said strip.

[0128] In this way, an internal assembly in the form of a multilayer wound coil for cylindrical coils can be precisely and efficiently realised.

[0129] Preferably, said supply unit comprises a respective alignment system for each strip of said plurality of strips.

[0130] In this way, it is possible to precisely control the positioning of all elements of the internal assembly during its creation.

[0131] Preferably, said alignment system comprises a fin opening integral with said alignment system and configured to pass said plurality of fins.

[0132] In this way, it is possible to retain a fold or pre-fold of the plurality of fins made in a step upstream of the alignment system.

[0133] Thanks to this solution, it will then be possible to size the position and extension of the fin opening in such a way as to choose whether to pass the plurality of fins through the alignment system alternatively without having any contact with the alignment system itself, or by having a slight contact, or by having a functional contact to ensure the predetermined orientation of the fins.

[0134] It is interesting to note that this technical solution advantageously allows a predetermined folding configuration of the plurality of fins to be maintained or guaranteed without damaging them even during the alignment step between the strip and the predefined feed path. Preferably, said fin opening is delimited or defined within said alignment system.

[0135] This ensures that the fin opening is displaced integrally with the alignment system during all possible alignment steps, thus producing a condition in which ideal and effective alignment can be achieved.

[0136] Preferably, said fin opening has a substantially triangular or rectangular or trapezoidal cross-section or similar polygonal geometric figures.

[0137] Thanks to this technical solution, it is possible to efficiently pass the plurality of fins through the alignment system, minimising the free space required by optimising the simplicity of the opening itself.

[0138] In particular, the substantially triangular and trapezoidal sections provide the possibility of creating, by means of an inclined side of the opening, a step of controlled contact between the plurality of fins and a part of the opening in order to define or guarantee a predetermined orientation of the fins.

[0139] Preferably, said fin opening is made side by side with said first roller and / or said second differential feed roller in a lateral position with respect to said predefined feed path.

[0140] In this way it is possible, through appropriate dimensioning of the first and / or second differential feed rollers, to define the position of the fin opening integral with the first frame.

[0141] According to an embodiment of the present invention, said fin opening is an indentation made in said first and / or second differential feed rollers.

[0142] Thanks to this technical solution, it is possible to create the opening for the fins simply and economically by removing material from an existing roller.

[0143] In this sense, the indentation has the sense of a "hollow" or "outlet" of the designated roller.

[0144] Preferably, said movable portion comprises a folding unit configured to fold said plurality of fins about an axis parallel to said longitudinal extension direction of said at least one strip.

[0145] Preferably, said folding unit is placed upstream of said alignment system. In this way, a predetermined orientation of the plurality of fins can be preserved or effectively guaranteed.

[0146] Preferably, said folding unit is housed on said movable portion.

[0147] In this way, it is possible to perform a further plurality of operations while maintaining continuous strip feeding.

[0148] According to one embodiment, the first roller or the second differential feed roller is connected at its axial ends to a first and a second sensor device, respectively. In other words, there is arranged a pair of sensor devices for each roller, both of which are connected to the axial ends of either the first or second differential feed roller.

[0149] Preferably, said first and second sensor devices are housed within a support portion of said first frame to which the second differential feed roller is constrained with an allowed rotation along its own second longitudinal axis.

[0150] According to one embodiment, each sensor device comprises a respective first and second annular load cell surrounding a first part of a connection body, which has a second part internally fixed to a rotoidal joint configured to allow the rotation about the second longitudinal axis.

[0151] Preferably, the rotary joint in turn is externally fixed to the second differential drive roller.

[0152] Thanks this technical solution it is possible to minimise the radial footprint of the rotoidal joint by limiting its contribution to interaction stresses between the second differential feed roller and the strip engaging it.

[0153] For the sake of completeness, it is reported that this embodiment can be similarly implemented on the first differential feed roller.

[0154] According to an embodiment, a first and / or a second load cell are housed externally to said support portion and on sides axially opposite to the first or second differential feed roller.

[0155] Preferably, said first and second load cells are of the compression type.

[0156] In one embodiment, said support portion comprises a first and a second support bracket at or in proximity to which the two axial ends of the second differential feed roller are constrained with an allowed rotation.

[0157] Preferably, said first and second load cells are respectively interposed between said first and second support bracket and said bracket.

[0158] In other words, said first and second support brackets are connected to the bracket by means of the first and second load cell.

[0159] Thus, when the second differential feed roller is subjected to a force transferred from the strip, it moves consistently in that direction. The two load cells detect this displacement and convert it into a signal that can be correlated to the force present on the second differential feed roller.

[0160] Thanks to this solution, it is therefore possible to measure and control the evolution of the forces acting on the second differential feed roller.

[0161] Clearly, also int his case, it is reported that this embodiment can be similarly implemented on the first differential feed roller.

[0162] Furthermore, this technical solution becomes advantageously practical when, for example, one does not have the possibility of inserting load cells inside the roller one wishes to control.

[0163] According to one embodiment, the alignment assembly comprises at least one encoder (or similar transducer) configured to detect the rotations produced by an associated roller.

[0164] According to an embodiment, at least one encoder is mounted on an extension of the second differential feed frame or on said support portion preferably on the side axially opposite said first or second differential feed roller and at said first or second longitudinal axis.

[0165] Preferably, said at least one encoder is mounted at said first rotation axis, which being optionally motorised can provide further useful information on the displacement and tension applied to the strip.

[0166] Thanks to this device, it is possible to selectively detect the rotations of the first differential feed roller that may be induced by the motor element so that a more precise control of the actual feeding the strip can be achieved.

[0167] Preferably, said encoder is installed axially opposite the motor element in order to advantageously optimise the various space requirements.

[0168] In embodiments, the alignment system comprises said sensor for the alignment of the strip placed close to the first or second differential feed roller of the alignment system.

[0169] According to some embodiments, there are provided two sensors, one placed upstream and one downstream of the alignment system.

[0170] Preferably, both the sensor placed upstream of the alignment system and the sensor placed downstream of the alignment system are positioned at a respective distance from the first longitudinal axis of the first differential feed roller of between 50 and 15 mm, preferably about equal to 20 mm.

[0171] It is understood that the distance between the sensor placed upstream and the first longitudinal axis may differ from the distance between the sensor placed downstream and the first longitudinal axis, as long as both are within the range described above.

[0172] Preferably, the distance of such sensors with respect to the first longitudinal axis is measured from the most proximal portion of the sensor (or, alternatively, from its sensing element).

[0173] Preferably, the sensor placed downstream of the alignment system is positioned at a distance from the rotation axis of the winding head (i.e. the winding head brought into the appropriate position to begin winding the strip) between 100 and 30 mm, preferably about equal to 64 mm.

[0174] According to one embodiment, the first differential feed roller is positioned so that its first longitudinal axis is at a distance from the rotation axis of the winding head (i.e. the winding head brought into the appropriate position to begin winding the strip 80) of between 150 and 50 mm, preferably equal to 94 mm.

[0175] Preferably, said first and / or second differential feed rollers have a cylindrical development.

[0176] In said sense, said cylindrical development is a function of said first and / or second longitudinal axis.

[0177] This provides an advantageous and uniform feed and control of the strip, which is subjected to a controlled and reproducible gripping. According to further embodiments, said first and / or second differential feed rollers have concave or convex development.

[0178] Thanks to this embodiment, the strip tends to move spontaneously towards the zone of maximum concavity or convexity.

[0179] According to further embodiments, one of said first and second differential feed rollers has concave development and the other has complementary convex development.

[0180] This creates an advantageous gripping between these differential feed rollers that spontaneously and effectively guides the strip towards the zone of maximum concavity.

[0181] Depending on the embodiment, this zone of maximum concavity or convexity may be defined at a central longitudinal zone equidistant from the longitudinal ends of the first or second differential feed rollers.

[0182] This make it possible to ensure that the strip is spontaneously moved towards the central longitudinal zone of the first or second roller, keeping it further away from the axial ends.

[0183] In embodiments, this zone of maximum concavity or convexity can be spaced from a central longitudinal zone of the first or second differential feed roller.

[0184] Thanks to this asymmetrical configuration, the strip can be guided in an even more specific and particular way.

[0185] According to further embodiments, one of said first and second differential feed rollers has a conical development, i.e. tapered towards one of its longitudinal ends.

[0186] Thanks to this embodiment, the strip can be made to tend to move spontaneously according to the development of the tapering. For example, the strip may move spontaneously towards the zone of the differential feed roller that has a smaller diameter.

[0187] Preferably, said first differential feed unit comprises a first roller and a second differential feed roller for said strip configured respectively in order to o rotate, respectively, about a first rotation axis and a second rotation axis and are parallel to each other and substantially perpendicular to said feed path, o make said strip pass in the space defined between them so as to engage said strip on opposite sides at a first interaction portion of said first differential feed roller and at a second interaction portion of said second differential feed roller, o have the projection on the strip, when in use, of at least one of the respective geometric centres of said first and second interaction portions at a first distance from a longitudinal median of said strip other than zero.

[0188] Preferably, said method comprises aligning said reference portion with said reference by rotating at least one of said first and / or second differential feed rollers about said first rotation axis and / or said second rotation axis thereby producing said first local difference of said feed rate asymmetrical with respect to said longitudinal median.

[0189] In this way, an effective alignment of the strip can be produced.

[0190] Preferably, said method comprised arranging a second differential feed unit, included in said alignment system, comprising a third and a fourth differential feed rollers for said strip configured respectively to o rotate about a third rotation axis and a fourth rotation axis and be parallel to each other and substantially perpendicular to said feed path, o make said strip pass in the space defined between them so as to engage said strip on opposite sides at a third interaction portion of said third differential feed roller and at a fourth interaction portion of said fourth differential feed roller. o have the projection on the strip, when in use, of at least one of the respective geometric centres of said third and fourth interaction portions is at a second distance from said longitudinal median other than zero.

[0191] Preferably, said method comprises aligning said reference portion with said reference by rotating at least one of said third and / or fourth differential feed rollers about said third rotation axis and / or said fourth rotation axis thereby producing a second local difference of said feed rate asymmetrical with respect to said longitudinal median. In this way, the alignment effect is advantageously further increased.

[0192] Preferably, said third and fourth differential feed rollers are positioned respectively facing and opposite, with respect to said longitudinal median, said first and second differential feed rollers.

[0193] This makes it possible to create a compact, efficient alignment system that is able to simply and quickly apply symmetrical changes in orientation of the strip.

[0194] Preferably, said method comprises arranging along said feed path a movable portion comprising said alignment system and configured to reversibly displace along a displacement direction between a first configuration distal to said dispensing unit and a second configuration proximal to said dispensing unit.

[0195] Preferably, said method comprises aligning said strip while said movable portion moves along said displacement direction.

[0196] In this way, a continuously controlled and correct alignment of the strip can be achieved even during the steps in which the movable portion displaces itself to avoid interruption in feeding the strip.

[0197] The characteristics and advantages of the invention will become clearer from the detailed description of a preferred embodiment thereof, shown by way of nonlimiting example, with reference to the appended drawings wherein:

[0198] - figure 1 is a schematic perspective view of the apparatus according to the present invention;

[0199] - figures 2, 3 and 4 are respectively a perspective view, a side view and a schematic view of a folding unit included in an embodiment according to the present invention;

[0200] - figure 5 is a perspective view of a further embodiment of the present invention,

[0201] - figures 6a and 6b are schematic figures of the invention realised according to the present invention,

[0202] - figures 7 and 8 are perspective views of embodiments according to schematic figures 6a and 6b,

[0203] - figure 9 is a side view of a section according to the plan X of figure 8,

[0204] - figure 10 is a frontal view of a section according to the plan X of figure 9,

[0205] - figure 11 is a detail of the view of figure 10. - figure 12 is a perspective view of a detail of an embodiment of the present invention,

[0206] - figure 12b is a frontal perspective view from below of a detail of an alternative embodiment similar to that shown in figure 7,

[0207] - figure 12c is a sectional view of a further embodiment similar to that shown in figure 11 ,

[0208] - figures 12d, and are perspective views of further embodiments in accordance with this technical solution,

[0209] - figure 12f is a perspective view of a detail of a further embodiment shown in figure 12c,

[0210] - figure 12g is a perspective view of a further embodiment according to this technical solution.

[0211] With reference initially to figure 1 , 100 denotes an apparatus for creating an internal assembly 3, preferably in the form of a coil B, realised in accordance with the present invention.

[0212] In embodiments of the present invention not shown in the accompanying figures, the internal assembly 3 may comprise a structure consisting of a stack of conductor foils individually separated or, alternatively, a multilayer structure of alternating separator foils and conductor foils.

[0213] In preferred embodiments, the apparatus 100 is intended to perform the coupling of a strip 80 or a strip-shaped article N, made from a plurality of strips, intended for the production of electrochemical cells.

[0214] It is however understood that this represents a possible embodiment example and that the apparatus 100 according to the present invention may be intended for coupling strip-shaped articles also intended for different uses, even in fields other than those relating to the production of electrochemical cells.

[0215] For example, still in the field of energy storage, the present invention can find application in the production of other wound components intended for batteries or supercapacitors.

[0216] In general and still with reference to figure 1 , the apparatus 100 is configured to supply at least one strip 80, by means of a dispensing unit 200, and couple it, by a coupling unit 300, thus creating the internal assembly 3.

[0217] For illustrative and non-limiting purposes only, in the following embodiments the coupling unit 300 will be described as the winding unit.

[0218] For example, the apparatus 100 may also be used in the context of a production line for electrochemical cell coils B, in which the strip-shaped article N is made by a combination of several strips 80, in detail a plurality of four strips N1 , N2, N3, N4 that are overlapped between them forming the strip-shaped article N wound in the coil B.

[0219] It is clear to the person skilled in the art that the embodiments described below regarding the use of the strip 80 are also immediately implementable in the aforementioned plurality of the strips N1 , N2, N3, N4.

[0220] Preferably, the plurality of strips N1 , N2, N3, N4 comprises two conductor strips (N1 and N3, generally metallic) and two separator strips (N2 and N4, generally polymeric).

[0221] Still with reference to figure 1 , it can be noted the presence of a supply unit 2 interposed between dispensing unit 200 and the winding unit 300.

[0222] More comprehensively, the dispensing unit 200 and the winding unit 300 are configured to respectively dispense and wind strip 80 along a feed path PA. This clarification aims at clearly defining the feed direction of the strip 80 and the consequent clear possibility of identifying process steps that are upstream or downstream with respect to the feed path PA.

[0223] Still with reference to the embodiments shown in figures 1 , the strip 80 or strips N1 , N2, N3, N4 are supplied by special dispensing devices 6 comprised in the dispensing unit 200.

[0224] This strip 80 or plurality of strips N1 , N2, N3, N4 may be strips made of polymeric material, more preferably polyolefins and even more preferably polyethylene, polypropylene or their co-polymers.

[0225] These strips have such a yielding nature that they can be rolled up on themselves without suffering critical structural damage and / or producing fractures in the material itself.

[0226] Figure 1 shows an embodiment of the dispensing devices 6 of the strip (e.g. separators or conductors), which may be large coils wherein a strip is collected so as to be unwound and then supplied during the operation of the apparatus 100. The strips obtained from the dispensing devices 6 are supplied to the supply unit 2 (placed downstream of the dispensing unit 6) which, in preferred embodiments, is responsible for combining the plurality of strips N1 , N2, N3, N4 with each other so as to form the strip-shaped article N before it is wound by the winding unit 300. It will be appreciated that the strip 80 or the plurality of strips N1 , N2, N3, N4, before being supplied to supply unit 2 may further pass through further units e.g. for preliminary processing on the strips.

[0227] In preferred embodiments, the strip 80 or the plurality of strips N1 , N2, N3, N4 are fed continuously, preferably into the supply unit 2.

[0228] In other words, each strip, or possibly one or more of the aforementioned strips, is fed by the dispensing devices 6 and introduced into the supply unit 2 without ever stopping, proceeding at a speed greater than zero and preferably substantially constant.

[0229] However, there may be the need to provide for interruptions of one or more of the strips dispensed or to slow down feeding one or more of the strips for other operating needs related to the specific processing being carried out.

[0230] For example, while producing coils intended for creating electrochemical cells, it can be provided that the strips that form anode and cathode respectively are not present in the terminal portion of the strip-shaped article that is wound to form the coil. In other words, it can be provided that the coil has a terminal and / or initial fin wherein only the two overlapped separator strips are present.

[0231] For this and other purposes, an accumulation device (not shown in the figures) configured to accumulate an amount of at least one of said plurality of strips N1 , N2, N3, N4 or the generic strip 80 may be provided.

[0232] According to preferred embodiments such as the one shown, for example, in figures 2 and 4, the strip 80 (generic example of characteristics also common to the plurality of strips N1 , N2, N3, N4 as argued above) comprises a main body 81 having main development according to its longitudinal direction L.

[0233] In further embodiments, the strip 80 comprises a plurality of fins 82 transversely projecting from the main body 81 with respect to the longitudinal direction L. figures 2 and 4 show that these transverse fins 82 (or "side fins") extend projecting from a larger side of the main body 81 of the strip 80. It can be noted that when the actual feed path of the strip 80 can be overlapped with the predefined feed path PA, then the longitudinal direction L substantially coincides with the predefined feed path PA.

[0234] Preferably, the plurality of fins 82 is realised by cutting or etching or ablation of the strip 80.

[0235] The plurality fins 82 can have various shapes and can be represented, when projected onto a reference plane, as, for example, trapezoidal, square, rectangular, triangular, rounded or similarly shaped two-dimensional structures.

[0236] It is interesting to note that it can be noted that the fins 82 are shaped so that, once the coil B is made, they can overlap on each other at least partially so as to create one continuous conductor element.

[0237] In order to be able to fold these fins 82 they are at least partially separated from each other by a through hole (or empty space or opening or "gap") extending in a direction transverse to the longitudinal direction L of the main body 81 .

[0238] It is therefore clear that during any processes implemented by the apparatus 100 the plurality of fins 82 can change their spatial orientation according to a predetermined pattern.

[0239] Consistently with the present invention, the alignment system 405' shown for example in figures 6a and 6b, is configured to achieve alignment between the strip 80 and the predefined feed path PA by rotation of the strip 80 itself.

[0240] Considering figure 1 , it can be noted that the supply unit 2 preferably comprises a movable portion 250 configured to move in reciprocating motion along its own displacement direction d preferably substantially parallel to a portion of the feed path PA. In other words, the movable portion 250 is configured to be able to displace with respect to the advancement of the strip 80 (or the plurality of the strips N1 , N2, N3, N4) thus causing a relative feed acceleration or slowdown.

[0241] It is interesting to note that in the event that the movable portion 250 advances by exactly the same amount as the plurality of strip 80 (or of the strips N1 , N2, N3, N4), a condition of relative speed equal to zero is created, i.e. a "moving stop" condition in which the movable portion 250 and the strip 80 (or the plurality of strips N1 , N2, N3, N4) are between them “stationary” although in motion with respect to an external reference system. This configuration makes it possible to perform specific tasks that would normally require stopping feeding the strip (e.g. selective retention and movement by grippers of a portion of the strip, cutting a strip into two parts, etc.) continuously without ever blocking the advancement of the strip.

[0242] In other words, when the movable portion 250 moves from an initial position and advances along the feed path PA according to substantially the direction d with a speed equal to that of the strip 80, it is able to realise a kind of buffer condition of the strip which can then be advantageously recovered as required simply by returning the movable portion 250 to its initial position by means of a displacement in the opposite direction to the advancement of the strip 80.

[0243] In the preferred embodiment shown in figure 1 , the movable portion 250 moves by pure translation in an alternating manner in the direction d, which is inclined at 45° with respect to the vertical.

[0244] In alternative embodiments, the movable portion 250 can move in different directions, e.g. horizontally.

[0245] In further embodiments pertaining to the present invention, such an alternating translation movement of the movable portion is replaceable by a more complex law of motion comprising a first forward tract (e.g. horizontal), a second displacement tract (e.g. vertical) a third backward displacement tract (e.g., horizontal, equal in modulus to the first horizontal feed tract but opposite in direction), and a fourth displacement tract (e.g., vertical, equal in modulus to the second vertical displacement tract but opposite in direction) enabling the movable portion 250 to return to its initial starting point once the intended law of motion has been completed, thereby realising a closed path.

[0246] In some embodiments such as the one shown in figure 1 , the strip N1 is a conductor strip oriented along the supply unit 2 substantially parallel to the displacement direction d of the movable portion 250. In an alternative embodiment of the present invention not shown in the figure, the displacement direction d of the movable portion 250 is horizontal and corresponds to the orientation of the conductor strip N3 along the supply unit 2.

[0247] The movement of the movable portion 250 is carried out by motorised displacement devices not shown in the figures, which preferably comprise rails or slides, moved by means of strips or racks. The movable portion 250 comprises, in the first embodiment versions described herein, at least one alignment system 405' constrained to it and configured to align the strip 80 to the predefined feed path PA.

[0248] In more detail and still with reference to figure 1 , the movable portion 250 comprises a movable input section 251 from which the strip 80 or the plurality of strips N1 , N2, N3, N4, which will then be wound to form the coil B by the winding unit 300, enter.

[0249] Preferably, the winding unit 300 comprises three winding heads 310 that can be moved by rotation with respect to the movable portion 250.

[0250] In preferred embodiments, each of the winding heads 310 allows for efficient and continuous winding of the strip 80 or the strip-shaped article N to form the desired coil B. It is interesting to note that the plurality of winding heads 310 allows for the continuous winding of coils B without having to stop the feeding of the strip 80.

[0251] In some embodiments not shown in the figures, the winding unit 300 comprises a rotatable body that ca rotate about its own rotation axis.

[0252] This rotatable body supports a plurality of extending arms, which are preferably hinged at one of their first ends to the rotatable body and which house at their second end, opposite the first, respective winding heads 310 for the continuous creation of the coils B.

[0253] For the sake of completeness, reference is now made to the example in figure 12 to show how the alignment system 405' is configured to displace the strip 80 so as to align a portion of reference 81 a of the strip 80 with respect to a reference 81 b of the apparatus 100. According to preferred embodiments, the reference portion 81 a is, for example, advantageously a lateral edge of the main body 81 or a creasing edge from which the plurality of fins 82 project.

[0254] Further, we note that reference 81 b is a spatial point identified at sensor 260'. Preferably, the sensor 260' can be an optical sensor, a photo / video camera, or similar technical solution.

[0255] Furthermore, the set reference can be a point, or a spatial segment or other specifically predefined geometric elements.

[0256] The sensor 260' is configured to detect any difference in alignment AAII between the strip 80 and the predefined feed path PA. In particular, in line with what has been argued above, it is advantageous to determine this difference in alignment by noting any variation in distance between the portion of reference 81 a and reference 81 b.

[0257] According to some embodiments, two sensors are provided, one upstream and one downstream of the alignment system 405'.

[0258] Preferably, both the sensor placed upstream of the alignment system 405' and the sensor placed downstream of the alignment system 405' are positioned at a respective distance from the first longitudinal axis 411X' of the first differential feed roller 411 'of between 50 and 15 mm, preferably about equal to 20 mm.

[0259] It is understood that the distance between the sensor placed upstream and the first longitudinal axis 411X' may differ from the distance between the sensor placed downstream and the first longitudinal axis 411 X', as long as both are within the range described above.

[0260] Preferably, the distance of such sensors from the first longitudinal axis 411X' is measured from the most proximal portion of the sensor (or, alternatively, from its sensing element).

[0261] Preferably, the sensor placed downstream of the alignment system 405' is positioned at a distance from the rotation axis of the winding head 310 (i.e., the winding head brought into the appropriate position to start winding the strip 80) between 100 and 30 mm, preferably about equal to 64 mm.

[0262] According to an embodiment, the first differential feed roller 411 ' is positioned such that its first longitudinal axis 411 X' is at a distance from the rotation axis of the winding head 310 (i.e. the winding head brought into the appropriate position to begin winding the strip 80) of between 150 to 50 mm, preferably 94 mm. figure 12b shows a perspective view from below which represents a detail of a further possible embodiment in which the first and second differential feed rollers 411 ', 412' have concave and convex development.

[0263] In more detail, it can be noted that the two differential feed rollers 411 ', 412' are shaped in such a way that they are substantially complementary and effectively engage the strip 80 between them.

[0264] According to the embodiments shown, the first differential feed roller 411 ' has a substantially convex development along its longitudinal axis 411X' while the second differential feed roller 412' preferably has a concave development.

[0265] In a further embodiment shown by way of non-limiting example in figure 12c, the first differential feed roller 411 ' (or, similarly, the second differential feed roller 412') can have a conical development with respect to its longitudinal axis. As can be noted, the first differential feed roller 411 ' has a tapered development from one axial end towards the other.

[0266] It is also possible to realise a combination of the first and second differential feed rollers 411 ', 412' having a conical development and configured as complementary between them, i.e. with tapering oriented from opposite directions with reference to the respective longitudinal axes.

[0267] Now with reference to figure 5, it can be noted that, preferably, a plurality of alignment system 405's are installed in the movable portion 250.

[0268] Specifically, figure 5 identifies four alignment system 405's placed upstream of the winding unit 300 and each acting on one of the strips N1 , N2, N3, N4.

[0269] Furthermore, the embodiment of figure 5 comprises two further alignment devices or alignment systems preferably placed immediately upstream of the winding unit 300 and each acting on one of the two conductor strips N1 , N3.

[0270] Furthermore, the movable portion 250 may comprise different types of alignment system 405's (or, in general, alignment devices) at its different portions.

[0271] In the embodiment shown in figure 5, the alignment system 405' is preferably positioned in proximity to the movable input section 251 , while a further type is positioned in proximity to and immediately upstream of the aforementioned winding unit 300.

[0272] In more detail, each alignment system 405' shown in figure 5 is configured to selectively move the strip 80 so as to align its reference portion 81 a with respect to the reference 81 b of the apparatus 100 by means of a rotation of the reference portion 81a about a transverse axis, preferably perpendicular, to the longitudinal direction L and the main body 81 of the strip 80.

[0273] Now with reference to figures 6a, 6b, exemplary embodiments are shown according to the present invention in which the apparatus 100, and more preferably the movable portion 250, comprises an alignment system 405' comprising a first differential feed unit 410a' which in turn comprises a first differential feed roller 411 a' and a second differential feed roller 412a'.

[0274] As depicted in figure 6a, the first differential feed roller 411 a' and / or the second differential feed roller 412a' are rotatable about a first rotation axis 411 aX' and a second rotation axis 412aX' (shown in detail in figure 11 ), respectively, which are substantially parallel to each other and substantially perpendicular to said feed path PA.

[0275] It is interesting to note that in figures 6a and 6b a feed rate VA of the strip 80 along the predefined feed path PA.

[0276] Still with reference to figure 6a, it can be noted that the first and second differential feed rollers 411 a', 412a' are configured to make strip 80 pass through the space defined between them in such a way as to engage it on opposite sides.

[0277] As shown in figure 6b, this engagement occurs at a first interaction portion 411 alnt' of a first differential feed roller 411 a' and at a second interaction portion of the second differential feed roller 412a', respectively.

[0278] Still with reference to figure 6b, the first and second differential feed rollers 411 a', 412a' are configured in such a way that the projection on the strip 80, when in use, of at least one of the respective geometric centres 411aC, 412aC of the first and second interaction portion 411 alnt', 412alnt' is at a first distance Di1 other than zero from a longitudinal median mL of the strip 80.

[0279] As shown in figure 10, the first differential feed roller 411 'a is selectively actuatable in rotation so that the strip 80 can be aligned to the predefined feed path PA by means of a first motor element 414a' connected to it.

[0280] Preferably, the first rotation axis 411 aX' of the first differential feed roller 411 'a is aligned and directly connected with the drive shaft of the first motor element 414a'. In said way it is then possible to produce a first local difference AVA1 of the feed rate VA of the strip 80 so as to displace the strip 80 along a transverse direction with respect to the predefined feed path PA in order to align said strip 80 with said predefined feed path PA.

[0281] Considering figure 6b, it can be noted that the strip proceeds with a uniform feed rate VA upstream of the alignment system 405', while following the interaction with the alignment system 405' it starts to have at least a first local difference AVA1 of the feed rate VA.

[0282] In more detail and as shown in figures 6b, 7, 8 and 11 , the alignment system 405' preferably comprises a second differential feed unit 410b' comprising a third and a fourth differential feed rollers 411 b', 412b' rotatable, respectively, about a third and a fourth rotation axis 411 bX', 412bX' parallel to each other and substantially perpendicular to the feed path PA.

[0283] Again, it can be noted that the third and fourth differential feed rollers 411 b', 412b' are positioned on the opposite side with respect to the longitudinal median mL to the first and second differential feed rollers 411 a', 412a'. t is also clear, for example from figures 7, 10 and 11 , that the third and fourth differential feed rollers 411 b', 412b' are configured to make the strip 80 pass in the space defined between them so as to engage the strip on opposite side at a third interaction portion 411 bint' of the third differential feed roller 411 b' and a fourth interaction portion of the fourth differential feed roller 412b'.

[0284] In other words, it can be noted that in the embodiment shown by way of nonlimiting example, the second differential feed unit 410b' is substantially arranged in a mirror-image manner, with respect to the longitudinal median mL, to the first differential feed unit 410a'.

[0285] Also in this case, the third and fourth differential feed rollers 411 b', 412b' are configured in such a way that the projection on the strip 80, when in use, of at least one of the respective geometric centres 411 bC, 412bC of the third and fourth interaction portions 411 bint', 412blnt' is at a second distance Di2 from said longitudinal median mL other than zero.

[0286] According to an embodiment, such first and second distances Di1 , Di2 have, respectively, an extension substantially equal to , more preferably about 1 / 3, of the distance between said first edge and / or said second edge and said longitudinal median mL.

[0287] As shown in figure 10, it can be noted that the third differential feed roller 41 1 b' is selectively actuatable in rotation, to produce a second local difference AVA2 of said feed rate VA of the strip 80, by means of a second motor element 414b'.

[0288] The same considerations produced for the first motor element 414a' apply to the second motor element 414b'. The first and second motor elements 414a', 414b' can be stepper or brush-less electric motors.

[0289] The first and / or second and / or third and / or fourth differential feed rollers are made of metal or polymer material. Advantageously, such rollers can be mounted on eccentrics in order to ensure more constant contact with the strip 80.

[0290] As shown schematically in figure 6b, the geometric centres 411 aC, 411 bC of the first and third feed rollers 411 a', 411 b' substantially correspond to their centre of mass.

[0291] Still with reference to figure 6b, it can be noted that the first, second, third and fourth interaction portions 411 alnt', 412alnt', 411 bint', 412blnt' coincide substantially with the contact portions of the respective first, second, third and fourth differential feed rollers 411 a, 412a, 411 b, 412b. In fact, in such a configuration all rollers are always in contact with the strip 80.

[0292] It is clear to the person skilled in the art that this condition may change from time to time depending on the necessary correction of alignment of the strip 80 or other specific operating conditions.

[0293] In other words, with reference to the examples of figures 6b and 11 , it can be noted that the strip 80 comprises a first longitudinal edge 83 and a second longitudinal edge 84 and that the first and second interaction portions 411 alnt', 412alnt' have an extension r substantially between the first edge 83 and said longitudinal median mL of said strip 80. In addition, it is noted that the third and fourth interaction portions 411 bint', 412blnt' have a longitudinal extent substantially between the second edge 84 and the longitudinal median mL of the strip 80.

[0294] Still with reference to figure 6b, it can be seen that the second local difference AVA2 of feed rate VA, acting on a second longitudinal half 86 of the strip 80, is preferably different from the first local difference AVA1 acting on a first longitudinal half 85 of the strip 80.

[0295] Considering now figure 11 , it can be noted that the first and second rotation axis 411 aX', 412aX' coincide with the third and fourth rotation axis 411 bX', 412bX' respectively.

[0296] In more detail and with reference, for example, to figures 9 and 10, it can be noted that the alignment system 405' is integrally constrained to the supply unit 2 and more preferably to the movable portion 250 by means of a support frame 406'.

[0297] This support frame comprises a base, configured to be connected to the movable portion 250, e.g. by means of screws or similar technical solutions, and a projecting wall perpendicular to the base. A first and a second support are fixed to this wall which serve to house the first and second differential feed units 410a', 410b’, respectively.

[0298] The second and fourth differential feed rollers 412a', 412b' are constrained to their respective supports by joints or unidirectional joints in such a way that they can be idle or freely rotating in one direction.

[0299] According to a preferred embodiment, the second and fourth differential feed rollers 412a', 412b' can be moved closer to and further away from the respective first and third differential feed rollers 411a', 411 b' by means of respective actuators.

[0300] These actuators each comprise a bracket, on which the respective second or fourth differential feed roller 412a', 412b' is housed, which is translatable, towards or away from the respective first and third differential feed rollers 411a', 411 b', by means of, for example, a rail-slide system (or similar technical solutions). Such actuators are preferably actuated by dedicated electric motors (stepper or brushless) not shown in the figures.

[0301] In alternative embodiments (not shown in full in the figures), all movements implemented with motorised systems can alternatively be implemented with pneumatic or electric systems (and vice versa).

[0302] Advantageously, the first and second interaction portions 411alnt', 412alnt' and / or the third and fourth interaction portions 411 bint', 412blnt' extend substantially from the first edge 83 and / or the second edge 84 respectively for about >2, more preferably about 1 / 3, of the distance between the first edge 83 and / or the second edge 84 and the longitudinal median mL.

[0303] It is interesting to note that when the second differential feed roller 412' is in a position PD spaced apart from the first differential feed roller 41 T, it is easier to insert an initial end or head of the strip 80 between them. Such a condition, for example, may arise after a coil B has been completed and a new end of the strip 80 made by cutting upstream of the alignment system 405' must be brought accurately and quickly to the winding head 310.

[0304] Once the initial end of the strip 80 has passed downstream of the first and second differential feed rollers 411 ', 412' while they were arranged according to the spaced-apart position PD, it is possible to translate the second differential feed roller 412' to the close position PR by bringing both differential feed rollers 411 ', 412' into contact on the strip 80.

[0305] At this point, the strip 80 is effectively engaged between the two differential feed rollers 411 ', 412' and their translation, according to the translation direction DT, or their rotation immediately results in a consistent displacement of the portion of strip 80 engaged there.

[0306] Even more, once the strip 80 is engaged between the first and second differential feed rollers 411 ', 412' it will be possible to effectively advance it selectively by rotating the electric stepper or brushless motor 414a' connected to the first differential feed roller 411 '.

[0307] Now with reference to figures 12d and 12e, it can be noted that a first and a second load cell 418c', 418d' can be mounted on the bracket 418b'. These first and second load cells 418c', 418d' are of the compression type and housed on axial ends opposite with respect to the second longitudinal axis 412X' of the second differential feed roller 412'.

[0308] In addition, the first and second load cells 418c', 418d' are respectively interposed between a first and second support bracket, on which the second differential feed roller 412' with an allowed rotation, and the bracket 418b' are housed. As will be seen below in further embodiments, said support brackets are included in a support portion 415d for the second differential feed roller 412'.

[0309] In this way, when the second differential feed roller 412' is subjected to a force transferred by the strip 80, it moves consistently in that direction and the two load cells 418c', 418d' detect this displacement, converting it into a signal that can be correlated to the force applied.

[0310] Furthermore, these load cells are configured in such a way as to be able to detect, in addition to tension variations induced by the strip 80, useful information so that an operatively connected processing unit can modify the position of the bracket 418b' so as to bring the second differential feed roller 412' closer to or further away from the first differential feed roller 41 T, thereby optimising the clamping force exerted on the strip 80 by the two rollers 411 ', 412'. figure 12f shows a detailed axial section of an embodiment in which the second differential feed roller 412' is connected at its axial ends respectively to a first and a second sensor device 1001 , 1002 which are preferably housed within a support portion 415d' to which the second differential feed roller 412' is constrained with an allowed rotation about its own second longitudinal axis 412X'.

[0311] This support portion 415d' preferably comprises the first and second support brackets described above and which are configured to accommodate the respective ends of the second differential feed roller 412'.

[0312] Returning to what is shown in figure 12f, each sensor device 1001 , 1002 comprises in turn a respective first and second annular load cell 1001a, 1002a surrounding a first part 601 of a connection body 600, which has a second part 602 internally fixed to a rotoidal joint 610 configured to allow the rotation about the second longitudinal axis 412X'.

[0313] This rotary joint 610 in turn is externally fixed to the second differential feed roller 412'. In particular, this configuration advantageously minimises the radial footprint of the rotoidal joint 610 by limiting its contribution to interaction stresses between the second differential feed roller 412' and the strip 80 engaging it.

[0314] The embodiments shown for the first and / or second differential feed roller 41 T, 412' can advantageously be applied to any roller included in the apparatus described herein.

[0315] As shown in figure 12g, in some embodiments the alignment system 405' comprises at least one encoder 411 a' (or similar transducer) configured to detect the rotations produced by a roller associated therewith.

[0316] According to one embodiment, the encoder 411 a' is mounted on an extension of the frame or on the support portion 415d' preferably on the side axially opposite said first or second differential feed rollers 41 T, 412' at said first or second longitudinal axis 411X', 412X'.

[0317] According to an embodiment shown for example in figure 12g, at least one encoder 411 a' is mounted at the first rotation axis 41 1 X' which, being optionally motorised, can provide further useful information on the displacement and tension applied to the strip 80. Thanks to such a device, it is possible to selectively detect the rotations of the first differential feed roller 41 T that are induced by the motor element 414a' so as to have a more precise control of the actual feed of the strip 80. In particular, the measurement of the rotations of the first differential feed roller 41 T about its first longitudinal axis 411 X' carried out by means of the encoder 411 a' is significantly advantageous immediately after a new end of the strip 80 has been interposed between the first differential feed roller 41 T and the second differential feed roller 412' and the first differential feed roller 41 T has been brought closer to the second differential feed roller 412' bringing them to the close position PR. At this point, it is possible to feed by rotation of the motor element 414a' the free end of the strip 80 (not yet engaged in the winding head 310) in contact with the first differential feed roller 41 T knowing, thanks to the information provided by the encoder 411 a', by how much and at what speed the end of the strip 80 is displacing itself.

[0318] It can be noted from figure 12g that the encoder 411 a' is installed on the side axially opposite to the motor element 414a', so that the various overall dimensions required can be optimised advantageously.

[0319] In embodiments, a portion integral with the differential feed roller (e.g. its shaft) extends longitudinally beyond the first differential feed roller 41 T so that its rotations can be measured by the encoder 411 a'.

[0320] According to embodiments not shown, the folding unit is positioned immediately downstream of the alignment system 405'.

[0321] With reference to figures 2 and 3, it can be noted that the previously described folding unit 1 may comprise a first curved abutment 10. This first curved abutment element 10 comprises in turn a convex curved abutment surface 11 and a folding curb 12 projecting from said convex curved abutment surface 11 .

[0322] In such a case, the term "convex" with reference to the convex curved abutment surface 11 as represented, for example, in figure 2 or 3, identifies a surface having a concavity oriented towards the opposite side of the surface that is in contact with the strip 80 when in use.

[0323] For further clarity and completeness, a comparison between a concave and a convex surface will be discussed below. As known, a geometric figure (e.g. plane surface or solid in space) is said to be concave if there is at least one segment joining two of its points that does not belong entirely to the figure.

[0324] Consistently, therefore, with what has been discussed above, in the case of the convex curved abutment surface 11 shown in figure 2, all the segments joining two of its points belong entirely to the figure itself.

[0325] In this context, it is noted that the convex curved abutment surface 11 is a surface portion of the curved element 10 that is intended to be in contact with the main body 81 of the strip 80. It is clear that the curved element 10 can be made either as a substantially solid element or as a profiled element of a predetermined thickness that substantially follows the extension of the convex curved abutment surface 11 itself.

[0326] In all such cases, the portion of the surface to be considered convex is the one configured to interact with the main body 81 of the strip 80.

[0327] Observing figure 2 and 4, it can be noted how, when the main body 81 of the strip 80 engages in abutment on the curved element 10, the plurality of fins 82 bent by the folding curb 12 increase their relative distance according to the longitudinal direction L, thus increasing the gap ("port") between them.

[0328] With reference to figures 2 and 3, it can be noted that the first curved abutment element 10 is preferably a first folding roller 13 with a circular cross-section.

[0329] This first idle folding roller 13 can be rotated about its first longitudinal axis X (see, for example, figure 2). figure 4 is a lateral schematic representation of the spatial arrangement of the main body 81 of the strip 80 and the fins 82 as they are folded on the first folding roller 13.

[0330] In more detail, it can be noted that the plurality of fins 82 of the strip 80 comprises a portion 82a radially proximal to the first folding roller 13 (and to the rotation centre 13a of the first folding roller 13) which is constrained directly to the main body 81 of the strip 80 and a radially distal portion 82b from the first folding roller 13 identified in proximity to the free end opposite to the radially proximal portion 82a. In figure 4, the arrow identifying the radial direction of the first folding roller 13 originating from the rotation centre 13a is identified as DR.

[0331] For the sake of clarity, the zone wherein the radially proximal portion 82a is constrained to the central body 81 of the strip 80 has been represented with a circle in figure 4. It is evident that at this zone the plurality of fins 82 has no possibility of increasing their mutual distance.

[0332] It can be noted, therefore, that the mutual distancing D between the plurality of fins 82 according to the longitudinal direction L of the strip 80 and the feed path PA is all the greater and more evident the more distant the radially distal portion 82b is from the main body 81 .

[0333] It is evident that for some applications, such as, for example, the analysis of the extension of the port between the plurality of fins 82, it will be advantageous to exploit this maximum distance obtained in proximity to the radially distal portion 82b.

[0334] Considering figure 2 ad 3 in more detail now, it can be noted that the folding unit 1 can comprise a second abutment element 15 in some preferred embodiments.

[0335] In the preferred example shown, the first curved abutment element 10 and the second curved abutment element 15 are respectively the first folding roller 13 and a second folding roller 17.

[0336] These two rollers 13, 17 are idle and freely rotatable respectively about the first longitudinal axis X and a second longitudinal axis X'. For a more detailed representation, consider the example in figure 2, wherein we can further see that the first longitudinal axis X and the second longitudinal axis X' are parallel to each other.

[0337] There is thus an ideal collaboration between the two rollers.

[0338] In more detail, the second folding roller 17 comprises a tapered portion 16 configured as complementary to the folding curb 12.

[0339] The second folding roller 17 is thus able to perform a synergetic function in the step of folding the fins 82 further improving the desired result.

[0340] Preferably, the apparatus 100 is configured to be able to carry out the following operating steps of a method for the alignment of the strip 80 intended for creating the internal assembly 3 of an electrochemical cell for producing batteries.

[0341] In some embodiments, the strip 80 comprises the fins 82 projecting from the main body 81.

[0342] As previously described, said method comprise dispensing by means of the dispensing unit 200 the strip 80 along a predefined feed path PA.

[0343] As already disclosed, this step could, for example, be realised by means of dispensing devices 6 in the form of strip or coil windings.

[0344] The method comprises arranging, downstream of the dispensing unit, the alignment system 405', which is configured to displace the strip 80 by displacing it along a transverse direction with respect to the predefined feed path PA.

[0345] Then, the method comprises identifying a possible alignment difference AAII between the strip 80 and the predefined feed path PA.

[0346] According to preferred embodiments already described, this action can be advantageously realised with the aid of the sensor 260', which can preferably be an optical sensor, a photo / video camera, or similar technical solution.

[0347] At this point, in the event that the alignment difference AAII is other than zero, it is provided for actuating the alignment system 405' according to the actuating methods described above, to align the strip 80 with the predefined feed path PA by engaging the strip 80 at the main body 81 .

[0348] Preferably, therefore, the sensor 260' is configured to detect the position of the reference portion 81 a of the strip (e.g. a side edge thereof) with respect to the reference 81 b (e.g. a specific point on the sensor 260' itself).

[0349] Advantageously, the sensor 260' is configured to acquire information with a certain sampling frequency of the desired signal depending, for example, also on the feed speed of the strip 80 itself.

[0350] This sampling can be carried out either continuously or discontinuously with a predefined acquisition frequency.

[0351] Advantageously, the method further provides for arranging the movable portion 250 downstream of the dispensing unit 200 which comprises one or more alignment systems 405'. Such a plurality of devices can be arranged both by acting on several strips, as for example shown in figure 5, and by implementing an alignment correction process along several points of the predefined PA path for the same strip 80.

[0352] At said point it is provided to align the strip 80 with respect to the feed path PA by displacing the movable portion 250 along the displacement direction d reversibly between the first configuration distal to the dispensing unit 200 and the second configuration proximal to the dispensing unit 200, so as to continuously supply and feed said strip 80.

[0353] Further, the method preferably comprises folding the plurality of fins 82, by means of the folding unit 1 preferably upstream of the alignment of the strip 80 with respect to the feed path PA.

[0354] For the person skilled in the art, it is clear that the previously described configurations can be implemented in preferred steps of the method.

[0355] For example, the respective actuator constrained to the bracket of the second or fourth differential feed roller 412a', 412b' is actuated to produce an approach or distancing to the first or third differential feed roller 411 a', 411 b' as required.

[0356] The method also provides that as soon as the strip 80 has been constrained by the first or second differential feed unit 410a', 4120b', the first or third differential feed rollers 411 a', 411 b' can be selectively actuatable in rotation so as to facilitate the controlled advancement of the strip 80 and the possible insertion into further processing units such as, preferably, the winding unit 300.

[0357] Obviously, a person skilled in the art may, in order to meet specific and contingent application requirements, make further modifications and variants to the abovedescribed invention, all falling within the scope of protection as defined by the following claims.

Claims

CLAIMS1 . Apparatus (100) for creating an internal assembly (3), comprising a dispensing unit (200) configured to dispense at least one strip (80) along a predefined feed path (PA) with a predefined feed rate (VA), an alignment system (405') positioned along said feed path (PA), wherein said alignment system (405') comprises a first differential feed unit (410a1) comprising a first differential feed roller (411 a1) and a second differential feed roller (412a1), rotatable, respectively, about a first rotation axis (411aX') and a second rotation axis (412aX') substantially parallel to each other and substantially perpendicular to said feed path (PA), wherein said first and second differential feed rollers (411 a1, 412a') are configured to make said strip (80) pass in the space defined between them so as to engage said strip (80) on opposite sides at a first interaction portion (411 alnt') of said first differential feed roller (411 a1) and at a second interaction portion of said second differential feed roller (412a1), wherein said first and second differential feed rollers (411 a1, 412a') are configured in such a way that the projection on the strip (80), when in use, of at least one of the respective geometric centres (411aC, 412aC) of said first and second interaction portions (411 alnt', 412alnt') is at a first distance (Di 1 ) other than zero from a longitudinal median (mL) of said strip (80), and wherein at least one of said first and second differential feed rollers (411'a, 412'a) is selectively actuatable in rotation so as to align said strip (80) with said predefined feed path (PA), and said second differential feed roller (412a1) is displaceable towards and away from the respective first differential feed roller (411 a1) by means of a respective actuator.

2. Apparatus (100) according to the preceding claim, wherein at least one of said first and second differential feed rollers (411 a1, 412a') is selectively actuatable in rotation to produce a first local difference (AVA1 ) of said feed rate (VA) of said strip (80) so as to displace said strip (80) along a transverse direction with respect to said predefined feed path (PA) so as to align said strip (80) with said predefined feed path (PA).

3. Apparatus (100) according to claim 1 or 2, wherein said alignment system (405') comprises a second differential feed unit (410b1) comprising a third and a fourth differential feed rollers (411 b1, 412b'), respectively rotatable about a third and a fourthrotation axes (411 bX' 412bX') which are parallel to each other and substantially perpendicular to said feed path (PA) and positioned on the opposite side, with respect to said longitudinal median (mL), to said first and second differential feed rollers (411 a1, 412a'), said third and fourth differential feed rollers (411 b1, 412b') are configured to make said strip (80) pass in the space defined between them so as to engage said strip on opposite sides at a third interaction portion (411 bint') of said third differential feed roller (411 b1) and at a fourth interaction portion of said fourth differential feed roller (412b'), said third and fourth differential feed rollers (411 b1, 412b') are configured in such a way that the projection on the strip (80), when in use, of at least one of the respective geometric centres (411 bC, 412bC) of said third and fourth interaction portions (411 bint', 412blnt') is at a second distance (Di2) from said longitudinal median (mL) other than zero, and wherein at least one of said third and fourth differential feed rollers (411 b1, 412b') is selectively actuatable in rotation to produce a second local difference (AVA2) of said feed rate (VA) of said strip (80).

4. Apparatus (100) according to the preceding claim, wherein said second local difference (AVA2) is different from said first local difference (AVA1 ).

5. Apparatus (100) according to claim 3 or 4, wherein:Said strip (80) comprises a first longitudinal edge (83) and a second longitudinal edge (84), said first and second interaction portions (411 alnt', 412alnt') of said first and second differential feed rollers (411 a1, 412a') have an extension substantially between said first edge (83) and said longitudinal median (mL) of said strip (80), and / or said third and fourth interaction portions (411 bint', 412b I nt') of said third and fourth differential feed rollers (411 b1, 412b') have a longitudinal extension substantially between said second edge (84) and said longitudinal median (mL) of said strip (80).

6. Apparatus (100) according to one of the preceding claims, comprising a coupling unit (300) configured to combine a plurality of conductor elements (7, 8) and at least one separator element (9), in apredefined structure so as to form said internal assembly (3) of said electrochemical cell, wherein said strip (80) is at least one of said conductor elements (7, 8) and said at least one separator element (9), a supply unit (2) of said coupling unit (300), placed downstream of said dispensing unit (200), comprising said alignment system (405') of said strip (80).

7. Apparatus (100) according to the preceding claim, wherein said one supply unit (2) comprises a movable portion (250) configured to reversibly displace along a displacement direction (d) between a first configuration distal to said dispensing unit (200) and a second configuration proximal to said dispensing unit (200), wherein said movable portion (250) comprises said alignment system (405').

8. Apparatus (100) according to claim 6 or 7, wherein said alignment system (405') is positioned immediately upstream of said coupling unit (300).

9. Apparatus (100) according to claim 6 or 7, wherein: said strip (80) is a separator strip, said internal assembly (3) of said electrochemical cell consists of a structure formed by a stack of conductor foils individually separated by said separator strip, said one coupling unit (300) is a stacking unit of said conductor foils separated by said separator strip, and said supply unit (2) comprises said alignment system (405') for said separator strip.

10. Apparatus (100) according to claim 6 or 7, wherein: said strip (80) is at least one of a plurality of strips (N1 , N2, N3, N4) comprising a pair of conductor strips and a pair of separator strips, said internal assembly (3) of said electrochemical cell consists of a coil (B) formed of said conductor strips and said separator strips, said one coupling unit (300) is a winding unit of said conductor strips and said separator strips, and said supply unit (2) comprises said alignment system (405') for said strip (80).11 . Method for aligning a strip (80), the latter intended for creating an internal assembly (3) of an electrochemical cell for producing batteries, comprising:- Dispensing said strip (80) along a feed path (PA) at a feed rate (VA),- Arranging an alignment system (405') of said strip (80) comprising a first differential feed unit (410a1) comprising a first and a second differential feed roller (411 a1, 412a') configured to make said strip (80) pass in the space defined between them so as to engage said strip (80) on opposite sides at a first interaction portion (411 alnt') of said first differential feed roller (411 a1) and at a second interaction portion of said second differential feed roller (412a1), said first differential feed roller (411 'a,) being selectively actuatable in rotation so as to align said strip (80) with said predefined feed path (PA), and said second differential feed roller (412a1) being displaceable towards and away from respective first differential feed roller (411 a1) by means of a respective actuator,- Identifying an alignment difference (AAII) between said strip (80) and said feed path (PA), and in the event that said alignment difference (AAII) is different from zero,- Aligning said strip (80) and said feed path (PA) by actuating said first differential feed unit (410a1) so as to produce a first local difference (AVA1 ) of said feed rate (VA) asymmetrical with respect to said longitudinal median (mL) of said strip (80) so as to accelerate or slow down a first local portion of said strip (80) with respect to a second local portion of said strip (80), identified on the opposite side, with respect to said longitudinal median (mL), of said first local portion of said strip (80).

12. Method according to the preceding claim, wherein:- Said first differential feed unit (410a') comprises a first and a second differential feed rollers (411a1, 412a') for said strip (80) configured respectively to o rotate about a first rotation axis (411 aX') and a second rotation axis (412aX') respectively, and be parallel to each other and substantially perpendicular to said feed path (PA), o have the projection on the strip (80), when in use, of atleast one of the respective geometric centres (411aC, 412aC) of said first and second interaction portions (411 alnt', 412alnt') at a first distance (Di1 ) from a longitudinal median (mL) of said strip (80) other than zero, said method comprises aligning said portion of said reference (81 a) with said reference (81 b) by rotating at least said first differential feed roller (411 a1) about said first rotation axis (411aX') thereby producing said first local difference (AVA1 ) of said feed rate (VA) asymmetrical with respect to said longitudinal median (mL).

13. Method according to the preceding claim, comprising:Arranging a second differential feed unit (410b1), included in said alignment system (405'), comprising a third and a fourth differential feed rollers (411 b1, 412b') for said strip (80) configured respectively to o rotating about a third rotation axis (411 bX') and a fourth rotation axis (412bX') and be parallel to each other and substantially perpendicular to said feed path (PA), o making said strip (80) pass through the space defined between them so as to engage said strip (80) on opposite sides at a third interaction portion (411 bint') of said third differential feed roller (411 b1) and at a fourth interaction portion (412blnt') of said fourth differential feed roller (412b'), o having the projection on the strip (80), when in use, of at least one of the respective geometric centres (411 bC, 412bC) of said third and fourth interaction portions (411 bint', 412blnt') at a second distance (Di2) from said longitudinal median (mL) other than zero, aligning said reference portion (81 a) with said reference (81 b) by rotating at least one of said third and / or fourth differential feed rollers (411 b1, 412b') about said third rotation axis (411 aX') and / or said fourth rotation axis (412bX') thereby producing a second local difference (AVA2) of said feed rate (VA) asymmetrical with respect to said longitudinal median (mL).

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