Equipment for making coils

Abstract

An apparatus (100) for making a coil (B) for an electrochemical cell, preferably intended for the production of a battery, comprises a first confined area (Z1) configured to operate at a first pressure (P1). The first confined area comprises at least one operating unit of the apparatus (100) for making the coil (B). The apparatus also comprises a first adjacent area (Z2) configured to operate at a second pressure (P2). The first adjacent area (Z2) is hydrodynamically connected to the first confined area (Z1). The first confined area (Z1) is configured to operate at an overpressure (SP1) relative to the first adjacent area (Z2). Also described is a method for making a coil (B) for an electrochemical cell, preferably intended for the production of a battery, wherein the coil (B) is made by winding a strip-like article (N).

Description

[Technical Field]

[0001] The solution relates to an apparatus for producing coils of the type formed by winding a strip or a strip-like article comprising a plurality of overlapping strips, for example, preferably coils for electrochemical cells intended for the production of batteries.

[0002] The solution also relates to a method for making a coil for an electrochemical cell, preferably intended for the production of a battery, wherein the coil is made by winding a strip-like article. [Background technology]

[0003] The solution is preferably applied in the field of electrochemical cell manufacturing, but is not limited to this, in the construction of which windings of strip-like articles are used.

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

[0005] Typically, equipment for making battery coils operates in controlled environments with very low airborne particle counts (clean rooms), and in some cases, or for some of its components, in very low relative humidity and low temperature environments (dry rooms).

[0006] For convenience and modularity of the device, different parts and devices may be configured as separable, interchangeable, independent / detachable modules, providing the user with a high degree of adaptability and freedom of modification. Summary of the Invention [Problem to be solved by the invention]

[0007] This approach is linked to the need to minimize the possibility of explosion during process steps, especially in the case of lithium-based materials that are subject to an explosion risk.

[0008] It is therefore clear that these technical measures arise from safety needs and objectives and are related to the possibility of undesirable chemical reactions between substances in the process environment.

[0009] In this disclosure and the appended claims, certain terms and phrases, unless expressly stated otherwise, shall be deemed to have the meanings set forth in the following definitions.

[0010] The term "contaminants" refers to solid and / or liquid and / or gaseous substances present in the area of the apparatus for making the coil and / or generated in the area of the apparatus for making the coil. Preferably, the contaminants include, in particular, fine dust or powder.

[0011] The term "confined" refers to a spatially bounded area through the use of one or more electronic devices and / or one or more physical elements (such as walls or air curtains), which in each case allow hydrodynamic exchange with at least one environment outside the bounded area.

[0012] The term "hydrodynamically connected," or more specifically, "hydrodynamically connected in use," refers to a state in which an operating configuration exists between a first portion and a second portion of a system that allows for the hydrodynamic transfer of material in an efficient manner.

[0013] In other words, in use, such a hydrodynamically connected configuration allows for the specification of a fluid path that follows a predetermined concentration or pressure gradient or hydrodynamically imposed direction of movement.

[0014] The term "operational unit" refers to a set of one or more devices and / or one or more units of an apparatus for making coils configured to perform at least one work step of the coil making process. An operational unit may constitute at least a part of a winding unit and / or a feeding unit of an apparatus for making coils.

[0015] The term "overpressure" in relation to a particular region of an apparatus for making coils means that this region has a higher pressure condition, preferably an average pressure, than other regions of the apparatus.

[0016] The term "recess" in relation to a particular region of an apparatus for making a coil means that this region has a lower pressure state, preferably an average pressure, than other regions of the apparatus.

[0017] The term "winding" means creating a spiral structure by the rotation of a strip, ribbon, or more generally a strip-like article around an axis, flat surface, or other structure. By winding, the strip-like article makes one or more turns around the axis or structure.

[0018] The term "coil" means any helical structure formed by winding a strip, ribbon, or more generally a strip-like article around an axis, flat surface, or other winding structure. Depending on the structure around which the strip-like article is wound, the overall shape of the coil may be substantially cylindrical, rather than flattened or other.

[0019] In the context of the present invention, the expression "substantially parallel" means a deviation of ±15°, preferably ±10°, more preferably ±5° from perfect parallelism.

[0020] The applicant has noted that it would be useful to provide for suction of dust and particulate matter generated and / or emitted in areas where cleaning, ablation and / or handling of the surface of the strip is carried out.

[0021] In such cases, the Applicant has noted that it would be convenient to be able to create a strongly depressed area around the periphery in order to quickly recover the substances produced during these processes and to prevent, as far as possible, the latter from moving around in the environment.

[0022] Additionally, the process step of winding the battery strip may proceed in a discontinuous manner with sudden accelerations and decelerations that create localized turbulence and further displace generated dust.

[0023] The applicant has recognized that it would be useful to be able to attempt to suppress this dust circulation stage, particularly in cases where the applied extraction system is insufficient to immediately or completely remove the particulate matter that is generated and circulated.

[0024] The applicant has also noted that the winding area is a particularly sensitive area, as it is at this area that the winding of the strip takes place to produce the final battery.

[0025] Furthermore, after several studies and approaches, the applicant realized that it would be interesting to take the opposite approach to the prior art by creating an additional change in the mobility of any dust present in the process environment. More specifically, the applicant discovered that it would be possible to confine or move any dust present to a desired environment and prevent as much as possible the dust from reaching more sensitive environments that require a certain level of dust protection.

[0026] Therefore, the applicant has considered it useful to be able to create "macroscopic" flow conditions that prevent dust from reaching particularly critical areas of the device.

[0027] Applicant then differentiated between different environments by categorizing them as those that can tolerate higher levels of dust and those that are heavily contaminated with unwanted dust. [Means for solving the problem]

[0028] Thus, in its first aspect, the solution relates to a device for making coils for electrochemical cells, preferably intended for the production of batteries.

[0029] Preferably, the apparatus for making the coil includes a first confined area configured to operate at a first pressure.

[0030] Preferably, the first confined area comprises at least one operating unit of an apparatus for making a coil.

[0031] Preferably, the apparatus for making the coil includes a first adjacent region configured to operate at the second pressure.

[0032] Preferably, the first adjacent region is hydrodynamically connected to the first confined region.

[0033] Preferably, the first confined region is configured to operate at an overpressure relative to the first adjacent region.

[0034] Thus, the first pressure is greater than the second pressure in an overpressure situation.

[0035] These characteristics can create an overpressure environment that prevents contaminants generated in or present in another environment, i.e., the first adjacent region, from entering the first confined region, thus confining contaminants, such as dust, that may be present in the first adjacent region to be outside the first confined region.

[0036] In its second aspect, the solution relates to a method for making a coil for an electrochemical cell, preferably intended for the production of a battery.

[0037] Preferably, the coil is made by winding a strip-like article.

[0038] Preferably, the method includes the step of providing an apparatus for making the coil.

[0039] Preferably, the apparatus for making the coil includes a first confined area.

[0040] Preferably, the first confined area comprises at least one operating unit of an apparatus for making a coil.

[0041] Preferably, the method includes the step of achieving an operating condition of overpressure in a first confined region relative to a first adjacent region.

[0042] Preferably, the first adjacent region is hydrodynamically connected to the first confined region so as to prevent ingress of contaminants from the first adjacent region into the first confined region.

[0043] Such properties ensure that the first confined region is substantially free of contaminants from the first adjacent region.

[0044] In its third aspect, the solution relates to a further method for making a coil for an electrochemical cell, preferably intended for the production of a battery.

[0045] Preferably, the coil is made by winding a strip-like article.

[0046] Preferably, the method includes the step of positioning an apparatus for making a coil, the apparatus including a first confined area.

[0047] Preferably, the first confined area comprises at least one operating unit of an apparatus for making a coil.

[0048] Preferably, the apparatus for making the coil comprises a first adjacent region hydrodynamically connected to the first confined region.

[0049] Preferably, the method includes the step of achieving a recessed operating state in the first adjacent region relative to the first confined region so as to prevent ingress of contaminants from the first adjacent region into the first confined region and / or so as to facilitate ingress of contaminants from the first confined region into the first adjacent region.

[0050] These features are particularly useful in retaining contaminants present in the first adjacent region.

[0051] In at least one of the above-mentioned aspects, the solution may have at least one of the preferred features described below.

[0052] Preferably, the first adjacent region is hydrodynamically connected to the first confined region in use.

[0053] In at least one embodiment of the solution, the overpressure is greater than 0.1 mbar, preferably greater than 0.5 mbar, more preferably greater than 2 mbar.

[0054] In at least one embodiment of the solution, the overpressure is between 0.1 mbar and 10 mbar, preferably between 0.3 mbar and 5 mbar, more preferably between 0.5 mbar and 3 mbar.

[0055] This causes airflow from the first confined area to the first adjacent area, preventing the movement of contaminants in the opposite direction, i.e., from the first adjacent area to the first confined area.

[0056] In at least one embodiment of the present solution, the first adjacent region is hydrodynamically connected to the first confined region by at least one opening arranged to define a preferably substantially laminar air flow at overpressure, said air flow passing through the opening at a speed greater than 0.1 m / s, preferably greater than 0.3 m / s, more preferably between 0.1 m / s and 1 m / s, even more preferably between 0.35 m / s and 0.55 m / s.

[0057] Thus, in such circumstances, the amount of air flow through the openings is such that the ingress of contaminants from the first adjacent area into the first limited area is prevented.

[0058] In at least one embodiment of the solution, the device for making the coil comprises a winding unit.

[0059] Preferably, the winding unit corresponds to an operating unit of an apparatus for making coils.

[0060] Preferably, the winding unit includes at least one winding head configured to wind at least one strip-like article to create a coil.

[0061] Preferably, the winding unit is contained within the first confined area.

[0062] Preferably, the winding unit operates under overpressure relative to the first adjacent region.

[0063] These properties make the winding unit substantially immune to contaminants that may be present in the first adjacent area, and achieving this goal is particularly appreciated in the field to which this solution belongs, since it is generally particularly important to prevent contaminants from being introduced into the coil during the winding of at least one strip-like article.

[0064] Preferably, the winding unit comprises a plurality of winding heads, each winding head configured to wind at least one strip-like article to create a coil.

[0065] Preferably, the winding unit comprises at least one winding head movement device configured to move the at least one winding head along the working path.

[0066] In at least one embodiment of the solution, the device for making the coil comprises a feeding unit.

[0067] Preferably, the supply unit is configured to supply a plurality of strips suitable for making at least one strip-like product.

[0068] Preferably, the plurality of strips includes at least one conductor strip and / or separator strip.

[0069] Preferably, at least one conductor strip of the plurality of strips is an electrode, more preferably an anode.

[0070] Preferably, at least one conductor strip of the plurality of strips is an electrode, more preferably a cathode.

[0071] Preferably, at least one conductor strip of the plurality of strips is an insulator, more preferably an electrical insulator.

[0072] Preferably, the electrical insulator is made of plastic.

[0073] Preferably, the plurality of strips includes at least one anode and at least one cathode.

[0074] Preferably, the plurality of strips includes at least one anode, at least one cathode, and at least one separator strip.

[0075] Preferably, the supply unit comprises a movable portion which includes an outlet through which the strip-like articles exit the supply unit.

[0076] The supply unit preferably comprises an outlet section through which the strip-like product is fed to the winding unit, and preferably at least one inlet section.

[0077] Preferably, the at least one inlet is adapted to receive at least one strip from a corresponding dispensing device.

[0078] Preferably, a feed path is defined for each of the strips.

[0079] Preferably, the supply paths each comprise an accumulation segment, the accumulation segments being substantially parallel to one another.

[0080] Preferably, the supply unit is configured to vary the longitudinal extension of each of the storage segments via movement of the movable part, the longitudinal extensions of the storage segments being varied simultaneously, preferably by the same amount, and preferably the storage segments being kept substantially parallel to one another.

[0081] These features allow the movement of the movable portion to be used to simultaneously accumulate the same amount of strip for each of the strips forming the strip-like product, thus allowing for a continuous supply of strip to be used while providing a step in which the strip-like product is not wound.

[0082] Preferably, the winding unit is configured to receive the strip of goods from the outlet portion.

[0083] Preferably, the supply unit includes a convergence region.

[0084] Preferably, the converging region comprises a bonding roller for bonding a plurality of strips through which the strip-like article is produced.

[0085] Preferably, the convergence region is configured within the first limited region.

[0086] Preferably, the convergent region operates under overpressure.

[0087] This is particularly useful for protecting the convergence area from changes in environmental conditions due to the presence of contaminants in the first adjacent area. Indeed, it should be noted that the convergence area is a particularly critical area of the device for making the coil, since the separator strips may be subject to electrostatic charges that inevitably attract contaminants, for example in the form of fine dust.

[0088] To avoid malfunction and / or breakage of the coil, it is desirable to avoid introducing contaminants between the strips during bonding of the multiple strips via the bonding rollers.

[0089] Preferably, the strips converge at a convergence region by reducing the mutual distance between each strip up to a combining roller which creates a strip-like article.

[0090] In this way, it is possible to optimally design the zones and process steps to create the final strip-like article, by allowing the strip accumulation / feed step to be independent of the joining / converging step.

[0091] Preferably, one strip of the plurality of strips is fed according to a direction substantially parallel to the direction of movement of the movable portion in the convergence region.

[0092] In this way, any stresses occurring on the strips in the vicinity of the bonding roller and during the bonding step between the strips on the bonding roller can be further reduced.

[0093] In at least one embodiment of the present solution, the supply unit comprises a limited suction area configured to operate at a third pressure.

[0094] Preferably, the supply unit includes a second adjacent region hydrodynamically connected to the suction region.

[0095] Preferably, the second adjacent region is configured to have a fourth pressure greater than the third pressure.

[0096] This allows dividing the supply unit into at least two areas: a suction area and a second adjacent area, whereby contaminants present in the second adjacent area are sucked into the suction area.

[0097] Preferably, the third pressure is the lowest pressure value in the supply unit.

[0098] Preferably, the third pressure is actuated and managed by a suction device located near a point of higher potential density of contaminants than other points in the supply unit.

[0099] In this manner, contaminants can be removed from the system by creating the desired pressure differential conditions to create a pressure gradient that effectively aspirates the contaminants while hydrodynamically pushing or confining the contaminants from the second adjacent region into the suction region.

[0100] In at least one embodiment of the present solution, the fourth pressure is essentially equal to the second pressure.

[0101] In this way, the first adjacent region and the second adjacent region have essentially the same pressure, and both regions are recessed relative to the first confined region.

[0102] In at least one embodiment of the present solution, the first adjacent region configured to operate at the second pressure includes at least a second confined region therein.

[0103] Preferably, the second confined region has a fifth pressure and is configured to operate at a second overpressure relative to the first adjacent region.

[0104] In other words, the above-mentioned fifth pressure is greater than the second pressure.

[0105] The first adjacent region defines at least a second confined region that is at an overpressure relative to the first adjacent region so as to prevent any contaminants present in the first adjacent region from entering the at least second confined region.

[0106] Preferably, the fifth pressure is equal to the first pressure.

[0107] Preferably, at least the second confined region is hydrodynamically connected to the first adjacent region.

[0108] Preferably, at least one separator winding formed by several turns of the separator strip is arranged within at least the second limited area.

[0109] More preferably, the two separator windings are arranged within at least the second limited area.

[0110] Preferably, the first flanking region includes two second confined regions therein.

[0111] More preferably, the two separator windings are each disposed within a corresponding second limited area.

[0112] Since the separator strip may be subject to electrostatic charges which inevitably attract contaminants, for example in the form of dust, it is particularly important to arrange the separator roll in a second confined area which operates under a second overpressure relative to the first adjacent area.

[0113] Preferably, a separator take-up is included in a corresponding dispensing device for supplying the separator strip to a corresponding inlet of the supply unit.

[0114] Preferably, at least one separator winding is rotated to unwind a corresponding strip, which is fed to a supply unit and preferably thereafter to a winding unit.

[0115] In at least one embodiment of this solution, the suction area is an ablation area of one of the strips.

[0116] Preferably, the ablation regions are identified to correspond to at least one corresponding laser ablation device.

[0117] Preferably, the laser ablation device is positioned to remove material from a surface of one of the plurality of strips to form a predetermined pattern on that surface.

[0118] The ablation action of the strip may generate contaminants such as fine dust generated by the removal of material from the strip, and a suction region located in the laser ablation device can suck in the contaminants generated by the ablation of the strip and prevent them from reaching a second adjacent region hydrodynamically connected to the suction region.

[0119] Preferably, the supply unit comprises a laser ablation device.

[0120] Preferably, at least one conductor winding formed by several turns of the conductor strip is arranged in the second adjacent region.

[0121] More preferably, the two conductor windings are arranged in a second adjacent region.

[0122] Preferably, the conductor strip having several turns is an electrode, more preferably an anode.

[0123] Preferably, the conductor strip having several turns is an electrode, more preferably a cathode.

[0124] Preferably, at least one conductor takeup is associated with a corresponding laser ablation device.

[0125] Preferably, the conductor spool is fed to an associated laser ablation device.

[0126] Preferably, the conductor take-up is rotated to unwind the corresponding strip, which is then pushed and fed to the laser ablation device.

[0127] Preferably, the conductor take-up is arranged in a corresponding dispensing device for supplying the conductor strip to a corresponding inlet of the supply unit.

[0128] Preferably, the conductor winding body is rotated to unwind the corresponding strip, which is fed to a feeding unit and then preferably to a winding unit.

[0129] More preferably, the conductor take-up body is rotated to unwind the corresponding strip, which is sequentially fed to the laser ablation device, the feed unit and the take-up unit.

[0130] In at least one embodiment of the present solution, the supply unit comprises two suction areas including a first suction area and a second suction area.

[0131] Preferably, the supply unit comprises two second adjacent areas including a second adjacent area and a further second adjacent area.

[0132] The second adjacent region and the further second adjacent region are hydrodynamically connected to the first suction region and the second suction region, respectively.

[0133] Preferably, the first suction region and the second suction region are corresponding ablation regions of one strip of the plurality of strips each defined on the laser ablation device.

[0134] Preferably, the second adjacent region and the further second adjacent region each include at least one conductor take-up.

[0135] More preferably, the second adjacent region includes at least one conductor take-up formed by a few turns of an anode, and the further second adjacent region includes at least one conductor take-up formed by a few turns of a cathode.

[0136] In at least one embodiment of the solution, the device for making the coil comprises at least one partial limiting element.

[0137] Preferably, the partial limiting element is located between the first adjacent region and the first limiting region.

[0138] Preferably, the at least one partial confinement element is configured to define a plurality of non-enclosed environments by inhibiting hydrodynamic movement of contaminants from a first adjacent region into the first confined region.

[0139] By providing such a confining element, it is possible to demarcate a separate environment in the apparatus for making the coil that prevents contaminants from migrating from the first adjacent region into the first confined region.

[0140] In at least one embodiment of the present solution, the at least one partial limiting element comprises at least one wall.

[0141] Preferably, the partial limiting element comprises at least one opening in the wall.

[0142] Preferably, at least one opening is configured to allow passage of at least one strip or strip-like article of the plurality of strips while simultaneously allowing hydrodynamic exchange to occur between the first limited area and the first adjacent area.

[0143] The wall can physically separate two areas of the apparatus for making the coil, ie, separate a first confined area from a first adjacent area.

[0144] Additionally, the wall allows passage of at least one strip or strip-like article of the plurality of strips while preventing migration of contaminants from the first adjacent region into the first confined region.

[0145] This allows for perfect control of the hydrodynamic exchange area between the two regions, creating conditions that inhibit the transport of contaminants.

[0146] The at least one partial limiting element may comprise, in addition to or as an alternative to the at least one wall, a device such as an air curtain arranged to generate a substantially laminar air flow capable of preventing transfer of contaminants between the two environments.

[0147] In at least one embodiment of the solution, the first confined area and / or the second confined area is provided as a chamber comprising a closed box-shaped body.

[0148] Preferably, the closed box-shaped body includes at least one partial limiting element disposed between the first adjacent region and the first limiting region and / or between the first adjacent region and the second limiting region.

[0149] Preferably, the closed box-shaped body has the shape of a parallelepiped, at least one of whose faces comprises the partial limiting element.

[0150] More preferably, the faces of the box-shaped body are constituted by respective walls, at least one of which is provided with an opening that allows the passage of one of the plurality of strips while at the same time creating a hydrodynamic exchange between two adjacent areas of the device for making the coil.

[0151] In at least one embodiment of the present solution, the second adjacent region is preferably made as a chamber comprising an associated closed box-shaped body.

[0152] Preferably, the closed box-shaped body of the second adjacent region comprises a relative partial limiting element disposed between the second adjacent region and the suction region hydrodynamically connected to the second adjacent region.

[0153] The partial restriction element preferably comprises a wall having an opening configured to allow passage of one of the plurality of strips while simultaneously allowing hydrodynamic exchange to occur between the second adjacent region and the suction region.

[0154] In at least one embodiment of the present solution, the first limited area and / or the first adjacent area comprises a pressure-sensing device.

[0155] Preferably, the pressure sensing device is operatively connected to a processing unit.

[0156] Preferably, the processing unit is configured to achieve and / or maintain a pressure value in each of the first limited area and / or the first adjacent area.

[0157] Preferably, the pressure value mentioned above is an average pressure value in the first limited area and / or the first adjacent area.

[0158] The pressure sensing devices may be equally spaced at multiple points in the first limited area (or first adjacent area) to obtain a calculation of the average pressure in the first limited area (or first adjacent area) through the processing unit.

[0159] Preferably, the additional pressure sensing device is arranged in the at least one second confined area and / or the at least one second adjacent area and / or the at least one suction area and is operably connected to the processing unit, wherein the processing unit is preferably further configured to establish and / or maintain a respective pressure value in the at least one second confined area and / or the at least one second adjacent area and / or the at least one suction area.

[0160] In at least one embodiment of the present solution, the pressure regulating device is arranged to control the pressure in the first confined area and / or in the first adjacent area and / or in the suction area and / or in the second adjacent area and / or in the second confined area.

[0161] Preferably, the pressure regulation device comprises at least one gas inlet line in the first confined area and / or in the second adjacent area and / or in the second confined area.

[0162] Preferably, the gas inlet line comprises at least one gas injection device configured to inject a desired amount of gas into the first confined area and / or the second adjacent area and / or the second confined area.

[0163] Additionally or alternatively, the pressure regulation device comprises at least one gas outlet line in the first adjacent region and / or the suction region.

[0164] Preferably, the gas outlet line comprises at least one suction device configured to extract a desired amount of gas from the first adjacent region and / or the suction region.

[0165] Preferably, the apparatus for making the coil comprises a pressure regulation device as described above.

[0166] In at least one embodiment of the solution, the apparatus for making the coil comprises at least one measuring device for measuring the velocity of the air flow.

[0167] Preferably, the measurement device is positioned to correspond to at least one opening between two adjacent regions of the apparatus, allowing hydrodynamic exchange between the adjacent regions.

[0168] Preferably, the measuring device comprises an anemometer.

[0169] Preferably, the measuring device is configured within the regulating device.

[0170] In at least one embodiment of the present solution, the method for making a coil comprises a step of achieving and / or maintaining in a first confined region an overpressure of greater than 0.1 mbar, preferably greater than 0.5 mbar, more preferably greater than 2 mbar relative to a first adjacent region.

[0171] In at least one embodiment of the present solution, the method for making a coil comprises achieving and / or maintaining in a first confined region an overpressure of 0.1 mbar to 10 mbar, preferably 0.3 mbar to 5 mbar, more preferably 0.5 mbar to 3 mbar relative to a first adjacent region.

[0172] In this way, substantially laminar flow conditions are achieved, reducing turbulence and controlling the emission of any contaminants, ensuring proper performance of the desired industrial process.

[0173] In at least one embodiment of the present solution, the method for producing a coil comprises a step of arranging a feeding unit of an apparatus for producing a coil to feed a plurality of strips to a combining roller on which a strip-shaped article is produced.

[0174] Preferably, the method includes the step of providing a winding unit comprising at least one winding head.

[0175] Preferably, the method comprises the step of establishing and / or maintaining a state of overpressure in a first confined area relative to a first adjacent area, wherein the first confined area comprises a winding unit.

[0176] This configuration can prevent contaminants that may be present in the first adjacent region from contaminating or otherwise altering the environment in which the winding unit is located.

[0177] In at least one embodiment of the present solution, the method for making a coil provides that the supply unit constitutes a convergence region.

[0178] Preferably, the converging region comprises a bonding roller for a plurality of strips from which the strip-like article is made.

[0179] Preferably, the convergent region is configured within the first confined region so as to be in a state of overpressure.

[0180] These features can prevent contaminants that may be present in the first adjacent region from getting between the strips during bonding of the strips by the bonding roller.

[0181] In at least one embodiment of the present solution, the method for making the coil comprises the step of placing a pressure sensing device in the first confined area and / or the first adjacent area.

[0182] Preferably, the method includes the step of locating at least one gas inlet line in the first confined area.

[0183] Preferably, the at least one gas inlet line comprises at least one gas injection device configured to inject a desired amount of gas into the first confined area.

[0184] In addition to, or as an alternative to, the at least one gas inlet line, the method preferably comprises providing the first adjacent region with at least one gas outlet line.

[0185] Preferably, the at least one gas outlet line comprises at least one suction device configured to extract a desired amount of gas from the first adjacent region.

[0186] Preferably, the method includes the step of operatively connecting the pressure sensing device to a processing unit.

[0187] Preferably, the method includes the step of operatively connecting at least one gas injection device and / or at least one suction device to the processing unit.

[0188] Preferably, the method comprises the step of establishing and maintaining, via the processing unit, a pressure value for each of the first limited area and / or the first adjacent area.

[0189] The sensing device, the at least one gas inlet line, the at least one gas outlet line, and the processing unit collectively enable regulation and maintenance of a desired pressure in a region of interest of the apparatus for fabricating the coil.

[0190] It should be noted that some steps of the above-described methods may be performed out of the order in which they are described. Furthermore, some steps are optional. Furthermore, some steps of the methods may be performed iteratively or in series or parallel with other steps of the methods. [Brief explanation of the drawings]

[0191] The features and advantages of the present solution will become more apparent from the following detailed description of non-limiting exemplary embodiments, given with reference to the attached drawings, in which: [Figure 1] 1 is a schematic illustration of an apparatus for making a coil according to an embodiment of the present solution; [Figure 2] FIG. 2 shows details of an apparatus for making the coil of FIG. 1. [Figure 3] FIG. 2 shows details of an apparatus for making the coil of FIG. 1. [Figure 4] FIG. 2 shows details of an apparatus for making the coil of FIG. 1. [Figure 5] FIG. 2 shows details of an apparatus for making the coil of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0192] With reference to the accompanying drawings, the reference number 100 designates an apparatus for making coils B for electrochemical cells, in particular for the manufacture of batteries.

[0193] With particular reference to Figures 1 and 2, the apparatus 100 for making the coil B includes a first confined area Z1 configured to operate at a first pressure P1 and comprises at least one operating unit of the apparatus 100 for making the coil B.

[0194] The apparatus 100 for making the coil B is also configured to operate at a second pressure P2 and includes a first confined area Z2 hydrodynamically connected to the first confined area Z1.

[0195] The first confined area Z1 is configured to operate at an overpressure SP1 relative to the first adjacent area Z2.

[0196] In the preferred embodiment shown in FIG. 1, the overpressure SP1 is equal to or greater than 0.2 mbar.

[0197] With particular reference to Figures 3 and 4, the operating unit is a winding unit 1 comprising a plurality of winding heads 2 configured to wind at least one strip-like article N to create a coil B.

[0198] Figure 3 shows the operating unit under different operating conditions.

[0199] The winding unit 1 is therefore arranged in a first limited zone Z1 and operates under conditions of overpressure SP1 relative to a first adjacent zone Z2.

[0200] The winding unit 1 also comprises a movement device 3 for the plurality of winding heads 2, which is configured to move the plurality of winding heads 2 along a working path.

[0201] The apparatus 100 for making the coil B also comprises a power supply unit 4 .

[0202] The power supply unit 4 is configured to supply a plurality of strips N1, N2, N3, N4 (specifically, four strips) suitable for producing at least one strip-shaped article N. The plurality of strips N1, N2, N3, N4 comprises a first conductor strip N1 and a second conductor strip N2 (the first strip is the strip between the anode and the cathode, and the second strip is the other strip), a first separator strip (electrical insulator) N3, and a second separator strip (electrical insulator) N4.

[0203] The supply unit 4 also comprises a movable part 5 which includes an outlet section 6 through which the strip-like product N passes on leaving the supply unit 4 and is fed to the winding unit 1 .

[0204] The winding unit 1 is therefore configured to receive the strip-shaped product N from the outlet 6 .

[0205] The supply unit 4 comprises an inlet 7 for receiving the strips N1, N2, N3, N4 from the respective dispensing devices.

[0206] With particular reference to Figures 1, 2 and 5, each dispensing device comprises a winding formed by relative strips wound together in several turns.

[0207] In detail, the apparatus 100 for producing the coil B shown in FIG. 1 comprises a set of first conductor windings 8, 9 formed by a conductor strip N2 each having several turns wound thereon, a set of second conductor windings 10, 11 formed by a conductor strip N1 each having several turns wound thereon, and four separator windings 12a, 12b, 13a, 13b formed by electrical insulators N3, N4 respectively.

[0208] With particular reference to Figures 3 and 4, a respective feed path 14, 15, 16, 17 is defined for each strip N1, N2, N3, N4.

[0209] These feed channels 14, 15, 16, 17 comprise respective accumulation sections 18, which are preferably substantially parallel to one another.

[0210] The supply unit 4 is configured to vary the longitudinal extension of each of the accumulation sections 18 by movement of the movable part 5. In particular, the longitudinal extensions of the accumulation sections 18 are varied simultaneously, preferably by the same amount, while keeping the accumulation sections 18 essentially parallel to one another.

[0211] 3 and 4, the supply unit 4 includes a convergence zone Z3 including a combining roller 19 for combining a plurality of strips N1, N2, N3, N4, which combines the strip-like article N. The convergence zone Z3 is arranged within the first confined zone Z1 and therefore operates under the above-mentioned overpressure SP1.

[0212] It should be noted that the strips N1, N2, N3, N4 of the device 100 for making the coil B converge in a convergence zone Z3, reducing their mutual distance to the bonding roller 19.

[0213] Preferably, the strips N1, N2, N3, N4 are fed according to a direction substantially parallel to the direction of movement of the movable part 5 in the convergence zone Z3.

[0214] Referring particularly to FIG. 5, the supply unit 4 includes limited first and second suction areas Z4A and Z4B configured to operate at a third pressure P3, and a second adjacent area Z5A and a further second adjacent area Z5B hydrodynamically connected to the first and second suction areas Z4A and Z4B, respectively.

[0215] The second adjacent zone Z5A, Z5B is configured such that the fourth pressure P4 is greater than the third pressure P3, and the fourth pressure P4 is preferably substantially equal to the second pressure P2.

[0216] In particular, the second adjacent region Z5A comprises a set of first conductor windings 8, 9 formed by respective conductor strips N2 wound with several turns, and the further second adjacent region Z5B comprises a set of second conductor windings 10, 11 formed by respective conductor strips N1 wound with several turns.

[0217] The two suction zones Z4A, Z4B are the ablation zones of the respective conductor strips N1 and N2. The ablation zones are identified by the respective laser ablation devices 20, 21.

[0218] At least one winding of the first set of conductor windings 8, 9 is associated with a laser ablation device 20 in the first suction zone Z4A, and at least one winding of the second set of conductor windings 10, 11 is associated with a laser ablation device 21 in the second suction zone Z4B.

[0219] Thus, the conductor windings associated with the laser ablation devices 20, 21 are rotated to unwind the respective strips, which are then fed sequentially to the respective laser ablation devices 20, 21, the feed unit 4 and the winding unit 1.

[0220] 2, the first adjacent region Z2 includes at least a second confined region therein, in particular the first adjacent region Z2 includes a second adjacent region Z6A and a further second adjacent region Z6B therein.

[0221] The second confined area has a fifth pressure P5 and is configured to operate at a second overpressure SP2 relative to the first confined area Z2, the fifth pressure P5 being substantially equal to the first pressure P1.

[0222] In particular, the second limited area Z6A comprises a pair of first separator windings 12a, 12b, and the further second limited area Z6B comprises a pair of second separator windings 13a, 13b.

[0223] At least one separator winding of the first set of separator windings 12a, 12b is rotated to unwind its respective strip and then fed to the supply unit and subsequently to the winding unit, and at least one separator winding of the second set of separator windings 13a, 13b is rotated to unwind its respective strip and then fed to the supply unit 4 and subsequently to the winding unit 1.

[0224] The apparatus 100 for producing the coil B includes a partial confinement element 22. In particular, the partial confinement element 22 is disposed between the first adjacent region Z2 and the first confined region Z1 and is configured to define a non-sealed environment by inhibiting hydrodynamic movement of contaminants from the first adjacent region Z2 to the first confined region Z1.

[0225] With particular reference to Figures 2 and 3, the partial restriction element 22 comprises at least one wall 23 provided with at least one opening 24 configured to allow passage of at least one strip of the plurality of strips N1, N2, N3, N4 while at the same time allowing hydrodynamic exchange to occur between the first restriction region Z1 and the first adjacent region Z2.

[0226] Referring now to the first limited area Z1 and the second limited areas Z6A, Z6B, these are made as chambers 25 with relatively sealed box-shaped bodies.

[0227] The closed box-shaped body 26 associated with the first limited region Z1 comprises a partial limiting element 22 located between the first adjacent region Z2 and the first limited region Z1. In contrast, the two closed box-shaped bodies 26A, 26B associated with the second limited regions Z6A, Z6B comprise relative partial limiting elements 22A, 22B located between the first adjacent region Z2 and the second limited region Z6A, and between the first adjacent region Z2 and the further second limited region Z6B, respectively.

[0228] The apparatus 100 for fabricating the coil B shown in the figure also includes a pressure sensing device 27 disposed in both the first limited region Z1 and the first adjacent region Z2 and operably connected to a processing unit 28.

[0229] The processing unit 28 is configured to establish and / or maintain pressure values in the first limited area Z1 and the first adjacent area Z2, respectively.

[0230] Further pressure sensing devices 27 are arranged in the second limited areas Z6A, Z6B, the second adjacent areas Z5A, Z5B and the suction areas Z4A, Z4B and are operatively connected to the processing unit 28. The processing unit 28 is thus further configured to achieve and / or maintain pressure values in each of the above-mentioned areas Z4A, Z4B, Z5A, Z5B and Z6A, Z6B.

[0231] The apparatus 100 for making the coil B also comprises a pressure regulation device 29 .

[0232] The pressure regulation device 29 is designed to influence the pressure in the first confined area Z1, the first adjacent area Z2, the suction areas Z4A, Z4B, the second adjacent areas Z5A, Z5B, and the second confined areas Z6A, Z6B.

[0233] In particular, the pressure regulation device 29 comprises gas inlet lines 30 in the first confined region Z1, in the second adjacent regions Z5A, Z5B, and in the second confined regions Z6A, Z6B, and gas outlet lines 31 in the first adjacent region Z2 and in the suction regions Z4A, Z4B.

[0234] The gas inlet line 30 comprises at least one gas injection device 32 configured to inject a desired amount of gas into the first confined region Z1, into the second adjacent regions Z5A, Z5B, and into the second confined regions Z6A, Z6B, while the gas outlet line 31 comprises at least one suction device 33 configured to extract a desired amount of gas from the first adjacent region Z2 and the suction regions Z4A, Z4B.

[0235] The apparatus 100 for making the coil B also comprises a measuring device 34 for measuring the velocity of the air flow. The measuring device 34 is placed in the opening 24 in the wall 23.

[0236] In particular, the measurement device 34 comprises an anemometer.

[0237] In a method for making a coil B for an electrochemical cell intended for the manufacture of a battery, the coil B is made by winding a strip-like item N. The method comprises the steps of placing an apparatus 100 for making the coil B and establishing an operating state of overpressure SP1 in a first limited area Z1 relative to a first adjacent area Z2.

[0238] The method may comprise the step of establishing and / or maintaining in the first confined zone Z1 an overpressure SP1 in the range of 0.2 mbar to 0.5 mbar relative to the first adjacent zone Z2.

[0239] Additionally or alternatively, the method may include the steps of arranging a supply unit 4 of the apparatus 100 for producing a coil B so as to supply a plurality of strips N1, N2, N3, N4 to a combining roller 19 on which a strip-shaped article N is produced, arranging a winding unit 1, and achieving and / or maintaining a state of overpressure SP1 in a first confined area Z1 relative to a first adjacent area Z2, wherein the first confined area Z1 may comprise the winding unit 1.

[0240] Additionally or alternatively, the method may include the steps of: disposing a pressure sensing device 27 in the first confined region Z1 and / or the first adjacent region Z2; disposing in the first confined region Z1 at least one gas inlet line 30 having at least one gas injection device 32 configured to inject a desired amount of gas into the first confined region Z1; providing in the first adjacent region Z2 at least one gas outlet line 32 having at least one suction device 33 configured to extract a desired amount of gas from the first adjacent region Z2; operably connecting the pressure sensing device 27 to a processing unit 28; operably connecting the at least one gas injection device 31 and the at least one suction device 33 to the processing unit 28; and establishing and maintaining pressure values in the first confined region Z1 and the first adjacent region Z2 via the processing unit 28, respectively.

[0241] A further method for producing a coil B by winding a strip-shaped article N, preferably for an electrochemical cell intended for the manufacture of a battery, comprises the steps of: positioning an apparatus 100 for producing the coil B; and achieving an operating state of a depression DP1 in the first adjacent region Z2 relative to the first limited region Z1 so as to prevent the ingress of contaminants from the first adjacent region Z2 into the first limited region Z1 and / or to promote the ingress of contaminants from the first limited region Z1 into the first adjacent region Z2.

Claims

1. A device (100) for making coils (B) for electrochemical cells, preferably intended for the manufacture of batteries, comprising: a first confined area (Z1) configured to operate at a first pressure (P1), said first confined area comprising at least one operating unit of said device (100) for making said coil (B); a first adjacent region (Z2) configured to operate at a second pressure (P2) and fluidically connected to said first confined region (Z1); Including, the first confined area (Z1) is configured to operate in a state of overpressure (SP1) relative to the first adjacent area (Z2); Apparatus (100).

2. 2. The apparatus (100) according to claim 1, wherein the overpressure (SP1) is greater than 0.1 mbar, preferably greater than 0.5 mbar, more preferably greater than 2 mbar.

3. a winding unit (1) including at least one winding head (2) configured to wind at least one strip-shaped article (N) to produce said coil (B); the winding unit (1) is contained within the first limited area (Z1) and operates under the condition of the overpressure (SP1) relative to the first adjacent area (Z2), 3. The apparatus (100) according to claim 1 or 2.

4. a supply unit (4) configured to supply a plurality of strips (N1, N2, N3, N4) suitable for producing said at least one strip-shaped article (N), the plurality of strips includes at least one conductor strip (N1, N2) and / or one separator strip (N3, N4); the supply unit (4) comprises a convergence zone (Z3) comprising a combining roller (19) for the plurality of strips (N1, N2, N3, N4), The strip-like product (N) is produced by the bonding roller (19), The convergence zone (Z3) is configured within the first confinement zone (Z1) and operates under the overpressure (SP1) condition. The apparatus (100) of claim 3.

5. The supply unit (4) a limited suction area (Z4A; Z4B) configured to operate at a third pressure (P3); a second adjacent region (Z5A; Z5B) hydrodynamically connected to the suction region (Z4A; Z4B) and configured to have a fourth pressure (P4) greater than the third pressure (P3); The apparatus (100) of claim 4, comprising:

6. The apparatus (100) of claim 5, wherein the fourth pressure (P4) is substantially equal to the second pressure (P2).

7. said first adjacent region (Z2) is configured to operate at said second pressure (P2) and includes at least one second confined region (Z6A; Z6B) therein; the second confined area (Z6A; Z6B) has a fifth pressure (P5) and is configured to operate at a second overpressure (SP2) relative to the first adjacent area (Z2); An apparatus (100) according to any one of claims 1 to 6.

8. The apparatus (100) of claim 5, 6 or 7 when dependent on claim 5 or 6, wherein the suction area (Z4A; Z4B) is an ablation area of one of the plurality of strips (N1, N2, N3, N4), and the ablation area is identified to correspond to at least one corresponding laser ablation device (21).

9. at least one partial limiting element (22) disposed between the first adjacent region (Z2) and the first limiting region (Z1); At least one of the partial confinement elements (22) is configured to define a plurality of non-enclosed environments that inhibit hydrodynamic transfer of contaminants from the first adjacent region (Z2) to the first confinement region (Z1). An apparatus (100) according to any one of claims 1 to 8.

10. At least one of the partial limiting elements (22) is At least one wall (23); at least one opening (24) in said wall (23); Including, the at least one opening is configured to allow passage of at least one strip of the plurality of strips (N1, N2, N3, N4) or the strip-like article (N) while simultaneously allowing hydrodynamic exchange between the first limited area (Z1) and the first adjacent area (Z2); 10. The apparatus (100) of claim 9.

11. 11. The device (100) according to any one of claims 1 to 10, wherein the first confinement area (Z1) and / or the second confinement area (Z6A; Z6B) are made as a chamber (25) comprising a closed box-shaped body (26), the closed box-shaped body (26) comprising at least one partial confinement element (22) arranged between the first adjacent area (Z2) and the first confinement area (Z1) and / or between the first adjacent area (Z2) and the second confinement area (Z6A; Z6B).

12. 12. The apparatus (100) according to any one of claims 1 to 11, wherein the first confined area (Z1) and / or the first adjacent area (Z2) comprises a pressure sensing device (27) operatively connected to a processing unit (28), the processing unit (28) being configured to establish and / or maintain a pressure value in the first confined area (Z1) and / or the first adjacent area (Z2), respectively.

13. 13. The apparatus (100) according to any one of claims 1 to 12, comprising at least one measuring device (34) for measuring the velocity of the air flow, said measuring device (34) being preferably arranged to correspond to at least one opening between two adjacent regions of said apparatus (100) and allowing hydrodynamic exchange between said adjacent regions.

14. A method for making a coil (B) for an electrochemical cell, preferably intended for the manufacture of a battery, said coil (B) being made by winding a strip-like item (N), - a step of arranging an apparatus (100) for making the coil (B), the apparatus (100) comprising a first limited area (Z1) comprising at least one operating unit of the apparatus (100) for making the coil (B); generating an operating state of overpressure (SP1) in the first confined area (Z1) relative to a first adjacent area (Z2), the first adjacent area (Z2) being hydrodynamically connected to the first confined area (Z1) so as to prevent ingress of contaminants from the first adjacent area (Z2) into the first confined area (Z1); A method comprising:

15. 15. The method according to claim 14, comprising the step of achieving and / or maintaining said overpressure (SP1) greater than 0.1 mbar, preferably greater than 0.5 mbar, more preferably greater than 2 mbar.

16. Arranging a feeding unit (4) of the device (100) for producing the coil (B) so as to feed a plurality of strips (N1, N2, N3, N4) to a combining roller (19) which produces the strip-like product (N); - providing a winding unit (1) comprising at least one winding head (2); - achieving and / or maintaining in said first limited zone (Z1) a state of overpressure (SP1) relative to said first adjacent zone (Z2); Including, The first limited area (Z1) comprises the winding unit (1), 16. The method of claim 14 or 15.

17. The supply unit (4) comprises a convergence zone (Z3), The converging zone (Z3) comprises a bonding roller (19) for the plurality of strips (N1, N2, N3, N4), The strip-like product (N) is produced by the bonding roller (19), The convergence zone (Z3) is configured within the first confinement zone (Z1) and operates under the overpressure (SP1) condition.

17. The method of claim 16.

18. disposing a pressure-sensing device (27) in said first limited area (Z1) and / or said first adjacent area (Z2); Arranging at least one gas inlet line (30) in said first confined area (Z1), said at least one gas inlet line (30) comprising at least one gas injection device (32) configured to inject a desired amount of gas into said first confined area (Z1); and / or Arranging at least one gas outlet line (31) in said first adjacent zone (Z2), said at least one gas outlet line (31) comprising at least one suction device (33) configured to extract a desired amount of gas from said first adjacent zone (Z2); operatively connecting said pressure sensing device (27) to a processing unit (28); operatively connecting said at least one gas injection device (32) and / or said at least one suction device (33) to said processing unit (28); establishing and maintaining, via said processing unit (28), a pressure value in each of said first limited area (Z1) and / or said first adjacent area (Z2); The method according to any one of claims 14 to 17, comprising:

19. A method for making a coil (B) for an electrochemical cell, preferably intended for the manufacture of a battery, said coil (B) being made by winding a strip-like item (N), Arranging an apparatus (100) for making a coil (B) comprising a first confined area (Z1), said first confined area (Z1) comprising at least one operating unit of said apparatus (100) for making said coil (B), said apparatus (100) comprising a first adjacent area (Z2) hydrodynamically connected to said first confined area (Z1); establishing an operational state of a depression (DP1) in the first adjacent region (Z2) relative to the first limited region (Z1) so as to prevent ingress of contaminants from the first adjacent region (Z2) into the first limited region (Z1) and / or to facilitate ingress of contaminants from the first limited region (Z1) into the first adjacent region (Z2); A method comprising:

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