Method and device for carrying out replacement of electrode web rolls for production of electrochemical cells

Abstract

A method for bonding a first electrode web to a second electrode web, the method comprising: providing a first free end (l1) of the first electrode web (n1); providing a second free end (l2) of a second electrode web (f2) at said first free end (l1) of the first electrode web (f1); applying a first connecting element (60b) to the first free end (l1) and the second free end (l2); a second connecting element (70b) is applied to the first free end (11) and the second free end (12).

Description

Technical Field

[0001] The present invention relates to a method and a device for producing a battery of the type that can be used in applications requiring the provision of electrical energy. In particular, the present invention relates to a method and a device for joining a first electrode web to a second electrode web for carrying out an exchange of electrode web rolls for producing an electrochemical cell, in particular a rechargeable type of electrochemical cell. Background Art

[0002] An electrochemical cell is a device that converts chemical energy into electrical energy using a reversible redox reaction and converts electrical energy into chemical energy by reversing the redox process. A primary battery or secondary battery includes one or more electrochemical cells connected in series or in parallel.

[0003] An electrochemical cell comprises a housing containing two electrodes, an anode and a cathode, separated by one or more electrolytic separators. The anode, cathode and separators are in the form of thin sheets or overlapping foils forming multiple layers, with the separators alternating with the anodes and cathodes.

[0004] Typically, electrodes are composed of different materials. For example, an electrode comprises a thin metal layer, such as copper or aluminum, coated on one or both sides with an electrochemically active material. In other examples, an electrode may consist of a polymer binder, a conductive additive, and the electrochemically active material. The primary function of the polymer binder is to hold the active material and the conductive additive together. In contrast, the separator is composed, for example, of an electrically insulating polymer film.

[0005] In cylindrical and prismatic electrochemical cells, the multiple layers consist of alternating layers of anodes, cathodes, and two separator sheets, wound into a cylindrical or prismatic winding, called a "jelly roll" or "Swiss roll," respectively, and inserted into the cavity of a hollow container. The cathode is placed in electrical contact with an electrode placed on the bottom of the hollow container and electrically isolated from the container itself. The anode is placed in electrical contact with a lid, which is placed to close the container and form the other electrical pole.

[0006] In an electrochemical cell obtained by "z-folding," multiple layers are formed from a single separator sheet that is folded multiple times to form several layers, with one or more anode sheets and one or more cathode sheets alternately interposed between the layers. The resulting multiple layers are placed in a housing (e.g., an envelope or "pouch"), with electrical terminals connected to the anode and cathode sheets, respectively, emerging from the housing.

[0007] Examples of such applications are lithium-ion rechargeable batteries, nickel-cadmium rechargeable batteries, and nickel-metal hydride rechargeable batteries.

[0008] In the applicant's experience, in the manufacture of electrochemical cells, the material for the electrodes (anode and / or cathode) is continuously fed to a forming station for assembling the electrodes with separators. For the continuous feeding of the electrode material for the anode and for the cathode, a roll is used on which an electrode foil is wound, which will be indicated below as an electrode web.

[0009] When the web roll is almost exhausted, it is necessary to combine the final portion of the electrode web in use with the initial portion of a new electrode web roll.

[0010] The Applicant has observed that the replacement of the electrode web roll should be performed in the shortest possible time so that the packaging machine in the forming station can continue production while the electrode web roll in use is stationary.

[0011] In order to avoid machine stops during bonding, a buffer of electrode material originating from the roll in use and acting as a reserve can be used. A shorter time for changing the electrode web roll will allow to have a smaller material buffer and therefore less waste.

[0012] In the applicant's experience, the operation of replacing an electrode web roll with a new roll usually requires the presence of an operator, for example to install the new roll, move or remove the used roll and / or assist or engage the electrode web.

[0013] In this regard, it should be noted that the environment housing the machinery for producing electrochemical cells is a drying chamber (typically with a relative humidity level not exceeding 5%), in which the operator can remain for a limited time, leaving to rehydrate on his own. If direct operator supervision is necessary, the time saved in changing the electrode web rolls will allow for a reduction in the time spent in the drying chamber.

[0014] The applicant has found that the first and second electrode webs may be dusty and / or greasy or oily on their surfaces, which makes it difficult to get any connecting elements to adhere to the electrode webs and tends to cause them to separate under stress caused by subsequent processing stations.

[0015] The applicant has realised that providing two sheets of unwound electrode web, one from a roll in use and one from a new roll, each having a respective free end, such that the respective free ends of the two sheets of electrode web are placed adjacent to each other, and applying a connecting element to the free ends of the two sheets of electrode web allows the electrode webs to be joined.

[0016] The applicant has also realized that applying the first and second connecting elements on opposite sides of the two electrode webs allows for a particularly strong bond despite the presence of dust or greasy matter on the electrode webs. Summary of the Invention

[0017] The present invention relates to a method and a device for joining a first electrode web to a second electrode web for carrying out an exchange of electrode web rolls for producing electrochemical cells and electrode web semi-finished products for producing electrochemical cells.

[0018] According to a first aspect of the present invention, a method for joining a first electrode web to a second electrode web for carrying out a change of electrode web rolls for producing an electrochemical cell is provided.

[0019] A method for joining a first electrode web to a second electrode web to implement a change of electrode web rolls for producing an electrochemical cell comprises:

[0020] Preferably, a first free end of a first electrode web is provided, the first electrode web comprising a first surface portion extending from the first free end and a second surface portion extending from the first free end opposite the first surface portion.

[0021] Preferably, a second free end of a second electrode web is provided at the first free end of the first electrode web, the second electrode web comprising a first surface portion extending from the second free end and a second surface portion extending from the second free end opposite the first surface portion.

[0022] Preferably, the first connecting element is applied at the first and second free ends by displacing a first applicator towards the first and second surface portions of the first and second electrode webs and releasing the first connecting element from the first applicator.

[0023] Preferably, the second connecting element is applied at the first and second free ends by displacing a second applicator towards the second surface portion of the first and second electrode webs and releasing the second connecting element from the second applicator.

[0024] According to a second aspect of the present invention, there is provided an apparatus for joining a first electrode web to a second electrode web for carrying out a change of electrode web rolls for producing an electrochemical cell.

[0025] Preferably, a first holding device is provided, which is configured to hold a first free end of a first electrode web so as to maintain the first free end in the bonding area, the first electrode web comprising a first surface portion extending from the first free end and a second surface portion extending from the first free end opposite the first surface portion.

[0026] Preferably, a second holding device is provided, which is configured to hold the second free end of the second electrode web so as to maintain the second free end in the bonding area at the first free end, the second electrode web comprising a first surface portion extending from the second free end and a second surface portion extending from the second free end opposite to the first surface portion.

[0027] Preferably, a first applicator is provided, which is movable between a rest position outside the bonding area and an application position in the bonding area, wherein the first applicator is configured to apply the first connecting element at the first free end and the second free end, on the first surface portion of the first electrode web and on the first surface portion of the second electrode web;

[0028] Preferably, a second applicator is provided, which is movable between a rest position outside the bonding area and an application position in the bonding area, wherein the second applicator is configured to apply the second connecting element at the first free end and the second free end, on the second surface portion of the first electrode web and on the second surface portion of the second electrode web.

[0029] The first connecting element is applied at a first surface portion of the first and second electrode webs and the second connecting element is applied at a second surface portion of the first and second electrode webs, ie on the opposite side with respect to the first connecting elements.

[0030] In this way the first and second electrode webs are joined by two opposing connecting elements. The applicant has found that the two opposing connecting elements cooperate to hold the first free end to the second free end and improve the tightness of the join in the presence of dust or greasy / oily matter.

[0031] The applicant has also found that, since the electrode web is relatively rigid in bending, a mirror bond about the longitudinal axis greatly improves the transfer of stresses between the first free end and the second free end.

[0032] The term "web" generally refers to a body having a length measured along a longitudinal direction, a width measured along a transverse direction orthogonal to the longitudinal direction, and a thickness measured along a direction orthogonal to both the longitudinal and transverse directions, wherein the thickness is at least two orders of magnitude less than the length and at least one order of magnitude less than the width.

[0033] In a non-limiting manner, the total length of the electrode web wound on a new roll for an anode or cathode of an electrochemical cell may be 4-8 orders of magnitude greater than its thickness and 2-4 orders of magnitude greater than its width.

[0034] Still by way of example, the thickness of an electrode web for producing an anode and / or cathode of an electrochemical cell may be comprised from 40 μm to 220 μm.

[0035] The electrode webs move along corresponding paths while being unwound from corresponding reels and / or supplied to forming stations. Unless otherwise specified, the term "upstream" refers to a position along the path of advancement of the electrode web, located toward the corresponding supply reel and / or away from the forming station. Unless otherwise specified, the term "downstream" refers to a position along the path of advancement of the electrode web, located away from the corresponding supply reel and / or toward the forming station.

[0036] Typically, each electrode web has a longitudinal edge along its length, wherein the longitudinal edge of the electrode web during its unwinding from the roll is aligned with the advancing path of the web itself while the web is fed.

[0037] The "free end" of the electrode web (first or second) is understood to mean the end of the unwound portion of the unwound electrode web, the free end being transverse to the longitudinal edge of the web.

[0038] An "end portion" of the electrode web refers to an end portion of the electrode web comprising a free end at one end thereof.

[0039] The term "adhesive," particularly with respect to adhesive tape, refers to the ability of a body to be attached to a surface to which it is applied, for example by means of an adhesive provided on the body.

[0040] When referring to the mutual positioning between the first free end of the second portion of the first electrode web and the second free end of the first portion of the second electrode web, the expression "aligned" or "aligned with each other" means that the first and second ends are arranged along a common resting plane.

[0041] When referring to a displacement in mutual proximity or a mutual arrangement between a first free end and a second free end, the expression "at..." generally refers to the proximity between the two ends. In a preferred embodiment, proximity between the two free ends means mutual positioning at a distance (understood as a minimum distance in this context) of less than or equal to 10 mm, preferably less than or equal to 5 mm, even more preferably less than or equal to 3 mm.

[0042] The expression "physical contact" in this specification and the appended claims refers to direct contact between two parts or components without any intervening device between the two parts or components.

[0043] When referring to the mutual position of the holding devices, the expression "substantially in contact" means that the first holding device and the second holding device are separated by a mutual distance along the placement plane of not more than 5 mm, preferably not more than 3 mm, for example comprised between 1 mm and 2 mm.

[0044] The expression "to join" or "junction" in this specification and the appended claims refers to connecting two or more parts or components together to form an assembly, wherein the parts or components of the assembly are mechanically constrained together.

[0045] With specific reference to the bond between the first electrode web and the second electrode web, "in bond" or "bonded" in this specification and the appended claims refers to a stable mechanical bond between respective ends (e.g., free ends) of the first electrode web and the second electrode web or between two end portions of the first electrode web and the second electrode web, the end portions including the respective free ends.

[0046] In the most general sense, in this description and in the claims that follow, the expressions "join" or "junction" do not necessarily provide for physical contact between the free ends.

[0047] By means of the holding devices and their movement, the action of holding the free ends of the first electrode web and the second electrode web close to each other can be performed automatically.

[0048] The present invention, in one or more aspects thereof, may have at least one of the preferred features described below. Unless expressly stated otherwise, these features may be present individually or in combination with one another in a method for joining a first electrode web to a second electrode web to implement a replacement of an electrode web roll for producing an electrochemical cell and / or a semi-finished electrode web for producing an electrochemical cell.

[0049] Preferably, applying the first connecting element and applying the second connecting element are performed simultaneously.

[0050] Preferably, providing the first free end and arranging the second free end comprises aligning the first and second electrode webs to a common resting plane at the first and second free ends.

[0051] Preferably, the first holding device and the second holding device are configured to align the first and second electrode webs along a common resting plane at the first and second free ends.

[0052] Preferably, the first connecting element and the second connecting element are mirror-applied relative to the co-locating plane.

[0053] Preferably, the first and second applicators are configured to be mirror-displaced relative to the placement plane between respective rest positions and application positions.

[0054] Preferably, applying the first applicator comprises pressing the first applicator against the first surface portion of the first electrode web and the first surface portion of the second electrode web.

[0055] Preferably, in a respective application position, the first applicator is configured to press the first connecting element towards the second applicator.

[0056] Preferably, in a respective application position, the second applicator is configured to press the second connecting element towards the first applicator.

[0057] Preferably, applying the second connecting element comprises pressing the second applicator against the second surface portion of the first electrode web and the second surface portion of the second electrode web.

[0058] Preferably, in a respective application position, the second applicator is configured to press the second connecting element towards the first applicator.

[0059] Preferably, pressing the first applicator and pressing the second applicator includes pressing the first applicator and the second applicator in opposite directions to each other, thereby holding the first free end and the second free end between the first applicator and the second applicator.

[0060] Preferably, applying the first connecting element comprises holding the first connecting element to the first applicator when the first applicator is displaced towards the first surface portion of the first electrode web and the first surface portion of the second electrode web.

[0061] Preferably, the first applicator comprises a first retaining surface configured to retain the first connecting element when the first applicator is displaced towards the respective application position.

[0062] Preferably, applying the second connecting element comprises holding the second connecting element to the second applicator when the second applicator is displaced towards the second surface portion of the first electrode web and the second surface portion of the second electrode web.

[0063] Preferably, the second applicator comprises a second retaining surface configured to retain the second connecting element when the second applicator is moved towards the respective application position.

[0064] Preferably, the first holding surface comprises a suction surface configured to hold a first adhesive patch having an adhesive face facing towards the bonding area.

[0065] Preferably, the second holding surface comprises a suction surface configured to hold a second adhesive patch having an adhesive side facing towards the bonding area.

[0066] "Suction surface" refers to a perforated surface, the pores of which are in fluid connection with the suction member.

[0067] Preferably, the first connecting element is an adhesive element.

[0068] Preferably, the second connection element is an adhesion element.

[0069] Preferably, the first connection element comprises a first adhesive patch.

[0070] Preferably, the second connection element comprises a second adhesive patch.

[0071] Preferably, the first applicator comprises a first punch.

[0072] Preferably, the second applicator comprises a second punch.

[0073] Preferably, applying the first connecting element comprises punching a first sheet of adhesive tape to form the first adhesive patch.

[0074] Preferably, applying the second connecting element comprises punching a second sheet of adhesive tape to form the second adhesive patch.

[0075] Preferably, punching the first sheet of adhesive tape comprises moving the first punch toward the first sheet of adhesive tape along a first punching direction and until the first punch reaches the first free end and reaches the second free end.

[0076] Preferably, punching the second sheet strip comprises moving the second punch towards the second sheet strip along a second punching direction and until the second punch reaches the first free end and reaches the second free end.

[0077] Preferably, moving the first punch along the first punching direction towards the first sheet of adhesive tape and until the first punch reaches the first free end and reaches the second free end is achieved by a single straight and uninterrupted translation of the first punch.

[0078] Preferably, moving the second punch along the second punching direction towards the second sheet of adhesive tape and until the second punch reaches the first free end and reaches the second free end is achieved by a single straight and uninterrupted translation of the second punch.

[0079] Preferably, a first punch base is provided, comprising a punch opening traversable by the first punch.

[0080] Preferably, the first punching base is in contact with the first adhesive tape while punching the first adhesive tape.

[0081] Preferably, a second punch base is provided, comprising a punch opening traversable by the second punch.

[0082] Preferably, the second punching base abuts against the second adhesive tape while punching the second adhesive tape.

[0083] Preferably, moving the first punch in the first punching direction towards the first sheet of adhesive tape and until the first punch reaches the first free end and reaches the second free end comprises inserting the first punch into the punching opening of the first punching base.

[0084] Preferably, moving the second punch along the second punching direction towards the second sheet of adhesive tape and until the second punch reaches the first free end and reaches the second free end comprises inserting the second punch into the punching opening of the second punching base.

[0085] Preferably, a first rotating body is provided.

[0086] Preferably, the first rotating body is placed along the first punching direction of the first punch.

[0087] Preferably, the first rotating body has a passage opening.

[0088] Preferably, displacing the first applicator towards the first surface portion of the first electrode web and the first surface portion of the second electrode web comprises inserting the first applicator through a passage opening of the first rotating body.

[0089] Preferably, the first rotating body can be switched to a non-operating position.

[0090] Preferably, the first rotating body is switchable to a cutting abutment position which can replace the non-operating position.

[0091] Preferably, the first rotating body is switchable between an inoperative position and a cutting abutment position.

[0092] Preferably, in the inoperative position of the first rotating body, the passage opening of the first rotating body is traversable by said first applicator being movable between a rest configuration and an applying configuration.

[0093] Preferably, in the cutting abutment position of the first rotating body, the passage opening of the first rotating body cannot be traversed by said first applicator.

[0094] Preferably, displacing the first applicator towards the first surface portion of the first electrode web and the first surface portion of the second electrode web comprises switching the first rotating body to a non-operating position and inserting the first applicator through a passage opening of the first rotating body.

[0095] Preferably, a second rotating body is provided.

[0096] Preferably, the second rotating body is placed along the second punching direction of the second punch.

[0097] Preferably, the second rotating body has a passage opening.

[0098] Preferably, displacing the second applicator towards the second surface portion of the first electrode web and the second surface portion of the second electrode web comprises inserting the second applicator through a passage opening of the second rotating body.

[0099] Preferably, the second rotating body can be switched to a non-operating position.

[0100] Preferably, the second rotating body is switchable to a cutting abutment position which can replace the non-operating position.

[0101] Preferably, the second rotating body is switchable between a non-operating position and a cutting abutment position.

[0102] Preferably, in the inoperative position of the second rotating body, the passage opening of the second rotating body is traversable by said second punch being movable between a rest configuration and an applying configuration.

[0103] Preferably, in the abutment position of the second rotating body, the passage opening of the second rotating body cannot be traversed by the second applicator.

[0104] Preferably, displacing the second applicator towards the second surface portion of the first electrode web and the second surface portion of the second electrode web comprises switching the second rotating body to a non-operating position and inserting the second applicator through a passage opening of the second rotating body.

[0105] Preferably, providing the first free end of the first electrode web comprises at least partially unwinding the first electrode web from a first electrode web roll.

[0106] Preferably, the at least partially unwound first electrode web comprises a first piece of unwound first electrode web defined by a first portion and a second portion.

[0107] Preferably, a first electrode web is provided along the first advancement path.

[0108] Preferably, providing the first free end portion of the first electrode web comprises cutting the first sheet of electrode web to separate a first portion from a second portion and defining the first free end portion on the second portion.

[0109] Preferably, providing the first free end of the first electrode web comprises holding the first free end with a first holding device.

[0110] Preferably, providing the second free end of the second electrode web comprises at least partially unwinding the second electrode web from a second electrode web roll.

[0111] Preferably, the at least partially unwound second electrode web comprises an unwound second sheet of electrode web defined by a first portion and a second portion.

[0112] Preferably, a second electrode web is provided along the second advancement path.

[0113] Preferably, providing the second free end portion of the second electrode web comprises cutting the second sheet of electrode web to separate the second portion from the first portion and to define the second free end portion on the first portion.

[0114] Preferably, providing the second free end of the second electrode web comprises holding the second free end with a second holding device.

[0115] Preferably, the first electrode web roll is the roll in use for feeding the electrode web to the forming station.

[0116] Preferably, the second electrode web roll is a new roll of electrode web which will replace the first electrode web roll for feeding the electrode web to the forming station once a change of the electrode web roll is performed.

[0117] Preferably, a blade is provided.

[0118] Preferably, a first counter blade is provided.

[0119] Preferably, the blade and the first counter blade are configured to cut the unwound first sheet of electrode web material between the first portion and the second portion to provide a first free end portion for the second portion of the first sheet of electrode web material.

[0120] Preferably, cutting the unwound first sheet of electrode web material comprises activating a blade and a first counter blade on the first sheet of electrode web material.

[0121] Preferably, the first counter blade is placed on the first rotating body.

[0122] Preferably, the first counter blade is rotationally fixed to the first rotating body.

[0123] Preferably, said first counter blade is engageable with said blade when the first rotating body is in the cutting abutment position.

[0124] Preferably, activating the first counter blade comprises switching the first rotating body into the cutting abutment position.

[0125] Preferably, the cutting abutment position is alternative to the inoperative position.

[0126] Preferably, when the first applicator is in the rest configuration, the first rotating body is in the cutting abutment position.

[0127] Preferably, a second counter blade is provided.

[0128] Preferably, the blade and the second counter blade are configured to cut the unwound second sheet of electrode web material between the first portion and the second portion to provide a second free end portion for the first portion of the second sheet of electrode web material.

[0129] Preferably, cutting the unwound second electrode web comprises activating a blade and a second counter blade on the second electrode web.

[0130] Preferably, the second counter blade is placed on the second rotating body.

[0131] Preferably, the second counter blade is rotationally fixed to the second rotating body.

[0132] Preferably, the second counter blade is engageable with the blade when the second rotating body is in the cutting abutment position.

[0133] Preferably, activating the second counter blade comprises switching the second rotating body to a cutting abutment position.

[0134] Preferably, the cutting abutment position is alternative to the inoperative position.

[0135] Preferably, when the second applicator is in the rest configuration, the second rotating body is in the cutting abutment position.

[0136] Preferably, when the second rotating body is in the non-operating position, the first rotating body is in the non-operating position.

[0137] Preferably, the first free end and the second free end are provided aligned with each other. In particular, the second portion of the first electrode web and the first portion of the second electrode web face each other on a common resting plane at the first free end and the second free end, respectively.

[0138] Preferably, the alignment between the electrode web roll unwound in use and the new electrode web roll is of the "head to head" type at both respective ends.

[0139] Preferably, the first advancement path and the second advancement path are arranged alongside each other.

[0140] Preferably, at the first and second pieces of the respective first and second electrode webs, the direction of the first advance path is parallel to the direction of the second advance path.

[0141] Preferably, the free ends of the first and second electrode web are perpendicular to the respective advancement paths.

[0142] The term "perpendicular to" a direction or axis in this context means orthogonality within a 5 degree tolerance.

[0143] Preferably, the first portion of the first sheet of electrode web is arranged upstream of the second portion of the first sheet of electrode web with respect to the first advance path.

[0144] Preferably, the first portion of the first electrode web adjoins the second portion of the first electrode web.

[0145] Preferably, the first portion of the second sheet of electrode web is arranged upstream of the second portion of the second sheet of electrode web with respect to the second advance path.

[0146] Preferably, the first portion of the second electrode web adjoins the second portion of the second electrode web.

[0147] Preferably, the first electrode web and the second electrode web have the same electrode thickness defined in a direction perpendicular to the longitudinal edges of the respective electrode web.

[0148] Preferably, after bonding the second portion of the first electrode web and the first portion of the second electrode web, the second portion of the first electrode web is released from the first holding device and the first portion of the second electrode web is released from the second holding device.

[0149] Preferably, the first electrode web is fed to the forming station of the electrochemical cell along a first advancement path by rotating the first electrode web roll.

[0150] Preferably, the rotation of the first electrode web roll is stopped.

[0151] Preferably, when the first electrode web roll is stopped, the first electrode web comprises a first unwound sheet of electrode web.

[0152] Preferably, both the first portion and the second portion of the first sheet of electrode web are held, in particular by means of a first holding device.

[0153] Preferably, feeding the first electrode web to a forming station of the electrochemical cell, stopping the rotation of the first electrode web roll and holding both the first and second portions of the first electrode web are performed before providing the first free end of the first electrode web.

[0154] Preferably, providing the first free end comprises cutting the first sheet of electrode web to physically separate the first portion of the first sheet from the second portion of the first sheet.

[0155] Preferably, cutting the first sheet of electrode web is performed while holding both the first portion and the second portion of the first electrode web.

[0156] Preferably, cutting the first sheet of electrode web comprises moving a first holding device from a remote position to a cutting position to hold both the first portion and the second portion of the first sheet of electrode web.

[0157] Preferably, holding the first free end portion of the first electrode web is achieved by continuing to hold the second portion of the first electrode web after cutting the first electrode web.

[0158] Preferably, moving the first holding device to the cutting position is performed before cutting the second electrode web.

[0159] Preferably, the cutting position is a position intermediate between the remote position and the approach position, wherein in the approach position the first holding device is substantially in contact with the second holding device and the cutting position.

[0160] Preferably, the first portion of the first sheet of electrode web is released while continuing to hold the second portion of the first sheet of electrode web.

[0161] Preferably, the second electrode web is unwound along the second advancement path by rotating the second electrode web roll.

[0162] Preferably, the rotation of the second electrode web roll is stopped.

[0163] Preferably, when the second electrode web roll is stopped, the second electrode web comprises an unwound second sheet of electrode web.

[0164] Preferably, both the first portion and the second portion of the second sheet of electrode web are held by a second holding device.

[0165] Preferably, before providing the second free end, the method comprises unwinding the second electrode web along the second advance path by rotating the second electrode web roll.

[0166] Preferably, when the second electrode web roll is stopped, the rotation of the second electrode web roll is stopped, the second electrode web including the unwound second sheet of electrode web.

[0167] Preferably, after unwinding the second electrode web and before stopping unwinding the second electrode web roll, a longitudinal end of the second electrode web is constrained downstream of the second sheet of electrode web with respect to the second advance path.

[0168] Preferably, the longitudinal ends are constrained to a winder of the second electrode web.

[0169] Preferably, before providing the first portion of the second electrode web having the second free end, the second electrode web is stretched along the second unwinding path by winding the second electrode web on a second electrode web winder.

[0170] Preferably, providing the second free end comprises cutting the second sheet of electrode web to physically separate the first portion of the second sheet of electrode web from the second portion of the second sheet of electrode web.

[0171] Preferably, cutting the second sheet of electrode web comprises moving a second holding device from a remote position to a cutting position to hold both the first portion and the second portion of the second sheet of electrode web.

[0172] Preferably, moving the second holding device to the cutting position is performed before cutting the second electrode web.

[0173] Preferably, the cutting position of the second sheet of electrode web corresponds to a position halfway between a distanced position and an approached position of the second holding device, wherein in the approached position the first holding device is substantially in contact with the second holding device.

[0174] Preferably, holding the second free end of the second electrode web is achieved by continuing to hold the first portion of the second electrode web after cutting the second electrode web.

[0175] Preferably, the second portion of the second electrode web is released while continuing to hold the first portion of the second electrode web.

[0176] Preferably, cutting the first electrode web is performed with the second holding device in a remote position.

[0177] Preferably, cutting the second electrode web is performed with the first holding device in a corresponding remote position.

[0178] Preferably, providing the first portion of the second electrode web having the second free end is performed before providing the second portion of the first electrode web having the first free end.

[0179] Preferably, moving the first holding device and the second holding device in a mutually approaching manner comprises moving the first holding device and the second holding device into respective approach positions to position the second portion of the first electrode web sheet to be aligned with the first free end of the second portion of the first electrode web sheet, wherein the second portion of the first electrode web sheet is positioned downstream of the first portion of the second electrode web sheet with respect to the first advancement path so that the first free end and the second free end are aligned with each other.

[0180] Preferably, a cutting mechanism is provided, the cutting mechanism being configured to cut the first sheet of electrode web to define a first free end portion of the second portion of the first sheet of electrode web.

[0181] Preferably, the cutting device is configured to cut the second sheet of electrode web to define a second free end portion of the first portion of the second sheet of electrode web.

[0182] Preferably, a first mobile device is provided, which is activated on at least one of the first holding device and the second holding device.

[0183] Preferably, the at least one first moving device is configured to move the first holding device and the second holding device closer to each other to align the first free end of the second portion of the first electrode web with the second free end of the first portion of the second electrode web.

[0184] Preferably, the first holding device comprises a first holding element and a second holding element.

[0185] Preferably, the second holding device comprises a first holding element and a second holding element.

[0186] Preferably, the first holding device is configured to operate in three operating states:

[0187] a first operating state in which the first and second retaining elements are activated;

[0188] a second operating state in which only one of the first holding element and the second holding element is activated, and

[0189] A third operating state, in which neither the first holding element nor the second holding element is activated.

[0190] Preferably, the second holding device is configured to operate in three operating states:

[0191] a first operating state in which the first and second retaining elements are activated;

[0192] a second operating state in which only one of the first holding element and the second holding element is activated, and

[0193] A third operating state, in which neither the first holding element nor the second holding element is activated.

[0194] Preferably, the first mobile device is started on the first holding device and is capable of moving between a remote position, an approach position and a cutting position intermediate between the remote position and the approach position, wherein the first holding device is away from the second holding device in the remote position and the approach position is roughly in contact with the second holding device, and the cutting device is preferably configured to cut the first electrode web at the cutting position.

[0195] Preferably, the remote position of the first movement device corresponds to the remote position of the first holding device.

[0196] Preferably, the approach position of the first mobile device corresponds to the approach position of the first holding device.

[0197] Preferably, the cutting position of the first moving device corresponds to the cutting position of the first holding device.

[0198] Preferably, the first moving device moves along a first sliding direction.

[0199] Preferably, the distal position and the proximal position of the first holding device are located on the cutting section, and the cutting section belongs to the plane where the cutting direction of the cutting device and the first sliding direction of the first holding device are located. Preferably, the cutting direction and the first sliding direction are perpendicular to each other.

[0200] Preferably, the remote position, the approach position and the cutting position of the first holding device are arranged along a straight line parallel to or coinciding with the sliding direction of the first moving device.

[0201] Preferably, the straight line including the position of the first holding device is perpendicular to the direction of the first advancement path at least at the first holding device.

[0202] Preferably, the apparatus comprises a second moving device which is activated on the second holding device and which is movable between a remote position in which the second holding device is remote from the first holding device, an approach position in which the second holding device is substantially in contact with the first holding device, and a cutting position intermediate between the remote position and the approach position.

[0203] Preferably, the cutting device is configured to cut the second electrode web at a cutting position of the second moving device.

[0204] Preferably, the remote position of the second movement device corresponds to the remote position of the second holding device.

[0205] Preferably, the approach position of the second mobile device corresponds to the approach position of the second holding device.

[0206] Preferably, the cutting position of the second moving device corresponds to the cutting position of the second holding device.

[0207] Preferably, the second moving device is configured to move along a second sliding direction.

[0208] Preferably, the distal position and the proximal position of the second holding device are located on a cutting section belonging to a plane where the cutting direction of the cutting device and the sliding direction of the second holding device are located, wherein the cutting direction and the sliding direction are preferably perpendicular to each other.

[0209] Preferably, the sliding directions of the first holding device and the second holding device are parallel to each other, and the cutting section of the second holding device corresponds to the cutting section of the first holding device.

[0210] Preferably, the distance position, the approach position and the cutting position of the second holding device are arranged along a straight line parallel to or coinciding with the sliding direction of the second holding device. Preferably, the straight line defined by the position of the second holding device coincides with the above-mentioned straight line defined by the corresponding position of the first holding device.

[0211] The applicant has demonstrated that the positioning configuration of each holding device can be achieved by movement in one direction only.

[0212] Preferably, the cutting position of the first holding device relative to the first advancement path of the electrode web corresponds to the cutting position of the second holding device relative to the second advancement path of the electrode web.

[0213] Providing respective cutting positions for both the first and second electrode webs at the same point of the respective advancement paths between the first portion of the second upstream electrode web and the second portion of the first downstream electrode web allows for accurate and fast joining.

[0214] Preferably, when the first moving device is in the cutting position, the second moving device is in the distanced position. Preferably, when the second moving device is in the cutting position, the first moving device is in the distanced position.

[0215] Preferably, the first holding device is in the first operating state (ie the first holding element and the second holding element are activated) when the first moving device is in the cutting position and the cutting device performs a cutting stroke.

[0216] Preferably, when the first mobile device is in the cutting position, the cutting device performs a cutting stroke by moving from a rest position to a plurality of start positions. Preferably, the cutting device also performs a reset stroke by moving between the plurality of start positions and the rest position; during the cutting stroke, the cutting device is configured to cut the first electrode web.

[0217] Preferably, the second holding device is in the first operating state when the second moving device is in the cutting position and the cutting device performs a cutting stroke.

[0218] Preferably, when the second moving device is in the cutting position, the cutting device performs a cutting stroke by moving from the rest position to a plurality of activation positions. Preferably, the cutting device also performs a reset stroke by moving between the plurality of activation positions and the rest position; during the cutting stroke, the cutting device is configured to cut the second electrode web.

[0219] Preferably, when the first mobile device and the second mobile device are in the respective approach positions, the first holding device and the second holding device are in the respective second operating states (only one of the first holding element and the second holding element is activated).

[0220] In this way, with respect to the advancement direction of the first and second electrode webs, the second free end is positioned upstream with respect to the first free end (which is positioned downstream).

[0221] Preferably, in the second operating state of the second holding device, the second holding element of the first holding device is activated to hold the second portion of the first electrode web having the first free end.

[0222] Preferably, in the second operating state, the first holding element of the second holding device is activated to hold the first portion of the second electrode web having the second free end.

[0223] Preferably, the first holding element and the second holding element of the first holding device comprise a first suction surface and a second suction surface, respectively.

[0224] Preferably, the first holding element and the second holding element of the second holding device comprise a first suction surface and a second suction surface, respectively.

[0225] Each suction surface of the respective holding element is configured to hold an object, such as an electrode web or the like, by suction.

[0226] Preferably, at least when the first holding device and the second holding device are in the first operating state,

[0227] - the first suction surface and the second suction surface of the first holding device are positioned along a first plane;

[0228] - the first suction surface and the second suction surface of the second holding device are positioned along a second plane, and

[0229] - The first plane is parallel to the second plane.

[0230] Preferably, the cutting mechanism comprises a cutting device comprising a blade.

[0231] Preferably, the cutting mechanism comprises a first counter blade placed at the first holding device;

[0232] Preferably, the cutting mechanism comprises a second counter blade placed at the second holding device.

[0233] Preferably, the first counter-blade is placed between the first suction surface and the second suction surface of the first holding device relative to said first plane.

[0234] Preferably, the second counter-blade is placed between the first suction surface and the second suction surface of the second holding device relative to the second plane.

[0235] Preferably, the blade slidably engages said first counter blade when the cutting apparatus performs a cutting stroke.

[0236] Preferably, said blade slidingly engages said second counter blade when the cutting apparatus performs a cutting stroke.

[0237] Preferably, the apparatus further comprises an electrode web deflector movable between a rest position and a first intercepting position.

[0238] Preferably, the deflector is movable between a rest position, a first web-intercepting position and a second web-intercepting position.

[0239] Preferably, in the first intercepting position the electrode web deflector is configured to engage the first electrode web and bring the first electrode web closer to the first holding device.

[0240] Preferably, in the second intercepting position the electrode web deflector is configured to engage the second electrode web and bring the second electrode web closer to the second holding device.

[0241] Preferably, the first moving device comprises a first supporting bracket movable in at least a first sliding direction, wherein the first holding device is fixedly mounted on the first supporting bracket.

[0242] Preferably, the first sliding direction is perpendicular to the first plane of the first suction surface and the second suction surface.

[0243] Preferably, the second moving device comprises a second supporting bracket movable at least in the second sliding direction, wherein the second holding device is fixedly mounted on the second supporting bracket.

[0244] Preferably, the second sliding direction is perpendicular to the second planes of the first and second suction surfaces.

[0245] Preferably, spacers are provided.

[0246] Preferably, the spacer comprises a pair of opposing first abutment surfaces positioned at a first distance and a pair of opposing second abutment surfaces positioned at a second distance smaller than the first distance.

[0247] Preferably, the spacer is movable between a first abutment position and a second abutment position, preferably in a rotational manner.

[0248] Preferably, the first abutment location and the second abutment location are angularly spaced 90° apart.

[0249] Preferably, when the spacer is in the first abutment position, a first distance between the first abutment surfaces is defined transversely to the first and second advancement paths.

[0250] Preferably, when the spacer is in the second abutment position, a second distance between the second abutment surfaces is defined transversely to the first and second advancement paths.

[0251] Preferably, the spacer has a generally rectangular shape.

[0252] Preferably, the rectangular spacer comprises two short sides and two long sides, the first abutting surfaces are defined on the two short sides, and the second abutting surfaces are defined on the two long sides.

[0253] Preferably, a first stop member is provided.

[0254] Preferably, the first stop member is fixed to the first moving device.

[0255] Preferably, the first stopping member is formed integrally with the first holding device.

[0256] Preferably, in the first abutment position, the spacer is configured to be stopped in abutment against the first stop member when the first moving device is in the cutting position.

[0257] Preferably, in the second abutment position, the spacer is configured to abut against the first stop member and stop when the first moving device is in the approximation position.

[0258] Preferably, the first stop member comprises a first stop surface configured to abut against said spacer.

[0259] Preferably, the first stop member comprises an adjustment device configured to adjust the position of the first stop surface relative to the first holding device in a direction transverse to the first advancement path.

[0260] Preferably, the adjustment device comprises a screw, and the first stop surface is defined at an end of the screw.

[0261] Preferably, the first stop surface is configured to abut against a first abutment surface of the pair of first abutment surfaces of the spacer when the spacer is in the first abutment position.

[0262] Preferably, the first stop surface is configured to abut against a second abutment surface of the pair of second abutment surfaces of the spacer when the spacer is in the second abutment position.

[0263] Preferably, a second stop member is provided.

[0264] Preferably, the second stopping member is fixed to the second mobile device.

[0265] Preferably, the second stop portion and the second holding device are formed integrally.

[0266] Preferably, in the first abutment position, the spacer is configured to abut and stop against the second stopping member when the second moving device is in the cutting position.

[0267] Preferably, in the second abutting position, the spacer is configured to abut against and stop the second stopping member when the second moving device is in the approximate position.

[0268] Preferably, the second stop member comprises a second stop surface configured to abut against said spacer.

[0269] Preferably, the second stop member comprises an adjustment device configured to adjust the position of the second stop surface relative to the second holding device in a direction transverse to the second advancement path.

[0270] Preferably, the adjustment device comprises a screw, and the second stop surface is defined at an end of the screw.

[0271] Preferably, the second stop surface is configured to abut against a first abutment surface of the pair of first abutment surfaces of the spacer when the spacer is in the first abutment position.

[0272] Preferably, the second stop surface is configured to abut against a second abutment surface of the pair of second abutment surfaces of the spacer when the spacer is in the second abutment position.

[0273] Preferably, moving the first holding device from the remote position to the cutting position comprises stopping the first holding device in the cutting position such that the first stop member abuts against the spacer arranged in the first abutment position.

[0274] Preferably, moving the second holding device from the remote position to the cutting position comprises stopping the second holding device in the cutting position such that the second stop member abuts against the spacer arranged in the first abutment position.

[0275] Preferably, moving the first holding device and the second holding device to the respective approximated position comprises stopping the first holding device in the approximated position such that the first stop member abuts against the spacer arranged in the second abutment position.

[0276] Preferably, moving the first holding device and the second holding device into the respective approximated position comprises stopping the second holding device in the approximated position such that the second stop member abuts against the spacer arranged in the second abutment position.

[0277] Preferably, the spacer is moved from the first abutment position into the second abutment position before moving the first holding device and the second holding device into the respective approximation position.

[0278] Preferably, in the remote position the first stop member is not in contact with the spacer.

[0279] Preferably, in the remote position the second stop member is not in contact with the spacer. BRIEF DESCRIPTION OF THE DRAWINGS

[0280] Further features and advantages of the invention will become more apparent from the following detailed description of preferred embodiments of the invention, provided by way of indicative and non-limiting examples, with reference to the accompanying drawings, in which:

[0281] - Figure 1 is a perspective view of an apparatus according to the invention for joining a first electrode web to a second electrode web for carrying out a replacement of electrode web rolls for producing electrochemical cells;

[0282] - Figure 2 It is from Figure 1 Stereoscopic views of the device observed from different angles;

[0283] - Figure 3 yes Figure 1 A front view of the device;

[0284] - Figure 4 yes Figure 1 a bottom view of the device with some components removed to highlight other components;

[0285] - Figure 5A yes Figure 1 a perspective view of a portion of the device;

[0286] - Figure 5B yes Figure 1 a perspective view of a portion of the device;

[0287] - Figure 6 yes Figure 1 a cross-sectional view of a detail of the device;

[0288] - Figures 7 to 11 are shown in different operating configurations of a method according to the invention for joining a first electrode web to a second electrode web for carrying out a replacement of electrode web rolls for producing an electrochemical cell Figure 1 A front view of the device;

[0289] - Figure 12 is an operating configuration according to the invention for joining a first electrode web to a second electrode web for carrying out a method for changing electrode web rolls for producing an electrochemical cell Figure 1 A cross-sectional view of a device;

[0290] - Figures 13 to 15 are represented in different operating configurations of the method according to the invention for joining a first electrode web to a second electrode web for carrying out a replacement of electrode web rolls for producing an electrochemical cell Figure 1 A schematic cross-sectional view of a device;

[0291] - Figure 16 is a conceptual graphical representation illustrating a positioning configuration of a first electrode web and a second electrode web prior to providing free ends of the respective electrode webs;

[0292] - Figure 16A is a conceptual graphical representation illustrating a junction of a first electrode web and a second electrode web;

[0293] - Figure 17 is a schematic diagram of an adhesive tape used in a method and apparatus according to the invention for bonding a first electrode web to a second electrode web for carrying out a change of electrode web rolls for producing an electrochemical cell;

[0294] - Figure 18 is a perspective view of another embodiment of a device according to the present invention for joining a first electrode web to a second electrode web for carrying out a replacement of electrode web rolls for producing electrochemical cells;

[0295] - Figures 19 to 21 yes Figure 18 Cross-sectional views of details of the device in different operating configurations.

[0296] The representations in the drawings are not necessarily to be understood to scale, and the proportions between the individual components are not necessarily adhered to. In the drawings, identical or similar elements of different embodiments are denoted by identical reference numerals. DETAILED DESCRIPTION

[0297] The drawing illustrates an apparatus for joining a first electrode web to a second electrode web for carrying out a change of electrode web rolls for producing electrochemical cells, which is generally indicated by the reference numeral 1. The apparatus 1 also has the function of connecting a first electrode web f1 to a second electrode web f2 for carrying out a change of electrode web rolls for producing electrochemical cells.

[0298] The apparatus 1 is employable in a rechargeable battery production line (not shown in the figures), wherein a plurality of electrode webs (such as, for example, an electrode web for forming a cathode and an electrode web for forming an anode) are unwound from respective rolls and fed to a forming station of an electrochemical cell, where the electrode webs are, for example, overlapped with each other, continuously wound together and cut to form a plurality of jelly rolls.

[0299] Device 1 can be (in Figures 7 to 11 Two roll supports (illustrated in FIG) are installed in the production line along the path of the electrode web unwound from its respective rolls between the electrochemical cell forming station. The two roll supports include a first roll support 81 configured to support and unwind a first roll of electrode web 83, and a second roll support 82 configured to support and unwind a second roll of electrode web 84. The first support 81 and the second support 82 can be used interchangeably to unwind electrode webs f1 and f2 from their respective rolls 83 and 84 for supply to the forming station (the active roll). New electrode web rolls are mounted on unused supports 81 and 82 and are supplied to the forming station when the active roll is exhausted or needs to be replaced.

[0300] In a non-limiting manner, in the embodiment shown in the drawings and the following description thereof, the first roll of electrode web 83 mounted on the first support 81 is a roll in use and the second roll of electrode web 84 mounted on the second support 82 is a new roll.

[0301] In the embodiment illustrated in the figures, the first roll support 81 and the second roll support 82 are positioned outside the device 1 .

[0302] An electrode web roll 83 is mounted on a first roll support 81, and a first electrode web f1 supplied to a forming station is unwound from the electrode web roll 83. Before the electrode web roll 83 in use is exhausted, a roll 84 of a second original electrode web f2 can be mounted on a second roll support 82, so that after the electrode web roll 83 in use is exhausted, the electrode web f2 can be unwound from the original roll 84 and immediately supplied to a downstream forming station.

[0303] The apparatus 1 comprises a stationary support 2. The stationary support 2 has an inlet portion 85 and an outlet portion 86, wherein the inlet portion 85 and the outlet portion 86 are located on opposite sides of the stationary support 2 and wherein the outlet portion 86 is adjacent to the forming station with respect to a general advancement path of the electrode web to the forming station.

[0304] The first mobile device 3 ( Figure 4 ) includes a first support bracket 4 movable in a first sliding direction d1. The first support bracket 4 is slidably mounted on the fixed support 2. The first moving device 3 includes one or more moving guides 3a placed between the fixed support 2 and the first support bracket 4 to guide the movement of the first support bracket 4 in the first sliding direction d1 (in the direction of the first sliding direction d1). Figure 3 and Figure 4 The first moving device 3 further comprises an actuator 3b, preferably a pneumatic cylinder, which is configured to actuate the movement of the first supporting bracket 4.

[0305] The second mobile device 5 ( Figure 4 ) includes a second supporting bracket 6 ( movable in a second sliding direction d2 Figure 3 and Figure 4 ). The second sliding direction d2 is parallel to the first sliding direction d1. The second support bracket 6 is slidably mounted on the fixed support 2. The first support bracket 4 and the second support bracket 6 are capable of moving toward and away from each other.

[0306] The second moving device 5 includes one or more movement guides 5a placed between the fixed support 2 and the second support bracket 6 to guide the movement of the second support bracket 6 in the second sliding direction d2. The movement guides 5a of the second moving device 5 are parallel to the movement guides 5a of the first moving device 3. The second moving device 5 also includes an actuator 5b, preferably a pneumatic cylinder, which is configured to actuate the movement of the second support bracket 6.

[0307] The first moving device 3 is configured to selectively move the first support bracket 4 relative to the fixed support 2 toward and away from the second support bracket 6. Similarly, the second moving device 5 is configured to selectively move the second support bracket 6 relative to the fixed support 2 toward and away from the first support bracket 4.

[0308] The apparatus 1 is configured to receive a first sheet of electrode web s1 of a first electrode web f1 unwound from a first electrode web roll 83 and a second sheet of electrode web s2 of a second electrode web f2 unwound from a second electrode web roll 84 .

[0309] The first guide roller 11 is located between the first electrode web roll 83 and the device 1 (particularly between the inlet portion 85 of the device 1). Figure 7-Figure 9 The first guide roller 11 is configured to deflect the first electrode web f1 and guide the first electrode web s1 along a first forward path p1. The first forward path p1 passes between the first support bracket 4 and the second support bracket 6. The first forward path p1 is perpendicular to the first sliding direction d1.

[0310] Outside the apparatus 1, a second guide roller 12 is positioned between the second rolled electrode web 84 and an inlet portion 85 of the apparatus 1. The second guide roller 12 is configured to deflect the second electrode web f2 and guide the second sheet of electrode web s2 along a second forward path p2. The second forward path p2 passes between the first support bracket 4 and the second support bracket 6. The second forward path p2 is perpendicular to the second sliding direction d2.

[0311] In an embodiment not shown in the figures, further guide rollers may be provided outside the device 1 .

[0312] In other embodiments not shown in the figures, instead of or in addition to rollers 11 and 12, a first guide roller can be mounted on the fixed support 2 or the first support bracket 4 at the entrance portion 85, and a second guide roller can be mounted on the fixed support 2 or the second support bracket 6 at the entrance portion 85.

[0313] The apparatus 1 includes a winder 16 for the second electrode web. The winder 16 is mounted on the second support bracket 6. The winder 16 is configured to receive an end of the second electrode web s2, distal from the second rolled electrode web 84, while the first electrode web f1 is being fed to the forming station. The winder 16 is rotatably actuated to provide the second electrode web s2 along the second advancement path p2, preferably while simultaneously feeding the first electrode web f1 to the forming station. The end of the second electrode web s2 can be manually applied to the winder 16.

[0314] In an embodiment, for the purpose of interchangeability in use of the electrode web f1 in use or a new electrode web f2 at the first carriage 4 or the second carriage 6, the device 1 may include a first electrode web winder 15, which is mounted on the first supporting carriage 4 and is configured to receive a longitudinal end of a sheet of electrode web unwound from the electrode web rolls 83, 84. The first electrode web winder 15 is rotatably actuatable and is arranged away from the first roll of electrode web 83.

[0315] The apparatus 1 comprises a first holding device 21, shown in greater detail in FIG5 , configured to hold a first electrode web s1. The first holding device 21 is movable along a first sliding direction d1 by a first movement device 3. The first holding device 21 faces a first advancement path p1. The first holding device 21 is secured to a first support bracket 4.

[0316] The first holding device 21 comprises a first holding element 22 ( Figure 5A 、 Figure 6 、 Figure 8 as well as Figure 9 The first holding element 22 is adjacent to the inlet portion 85 of the support 2 and away from the outlet portion 86 relative to the first advancing path p1. The first holding element 22 includes a first suction surface 23 ( Figure 5A The first suction surface 23 is flat. The first suction surface 23 includes a plurality of suction holes 24 placed in fluid communication with a suction member (not shown). The first suction surface 23 is parallel to the first advancing path p1. The first suction surface 23 is orthogonal to the first sliding direction d1.

[0317] The first holding device 21 includes a second holding element 25 formed, for example, by a plate. The second holding element 25 is placed downstream of the first holding element 22 relative to the first advance path p1. The second holding element 25 includes a second suction surface 26. The second suction surface 26 is flat. The second suction surface 26 includes a plurality of suction holes 27, which are placed so as to be in fluid communication with a suction member (not shown), preferably shared with the first suction surface 23. The second suction surface 26 is aligned with the first suction surface 23 relative to a direction perpendicular to the first advance path p1. At least in the portion of the path at the first holding device, the second suction surface 26 is parallel to the first advance path p1. The first suction surface 23 is orthogonal to the first sliding direction d1.

[0318] The first suction surface 23 and the second suction surface 26 of the first holding device 21 are independently powered so that they can activate or deactivate suction independently of each other. For example, the first suction surface 23 and the second suction surface 26 are connected to the suction member by means of two separate connecting pipes, on which corresponding suction valves (not shown in the drawings) are arranged. The suction valves are configured to be actuated independently of each other in a closed position or an open position.

[0319] The first suction surface 23 and the second suction surface 26 are coplanar.

[0320] Once the cutting is completed, the suction on the second holding element 22 is maintained, while on the first holding element 25 it is deactivated to allow the first electrode web f1 to be separated from the working roll 83 (in use).

[0321] In an embodiment, the first holding element 22 and the second holding element 25 of the first holding device 21 are spaced apart from each other along a direction parallel to the first advancement path p1, thereby forming an opening 87a ( Figure 5A ).

[0322] The first holding device 21 is mounted on the first supporting bracket 4 at the end of the first bracket intersecting the sliding direction d1. In particular, the holding surfaces 23, 26 are placed at the ends of the first bracket.

[0323] In a particular embodiment, the holding surfaces 23 , 26 of the first holding element 22 and the second holding element 25 of the first holding device 21 have the same size and shape.

[0324] The apparatus 1 comprises a second holding device 31 configured to hold a second electrode web s2 of the second electrode web f2. The second holding device 31 is movable along a second sliding direction d2 by a second movement device 5.

[0325] The second holding device 31 is fixed to the second supporting bracket 6. The second holding device 31 faces the second advancement path p2. The second holding device 31 faces the first holding device 31.

[0326] The second holding device 31 is mounted on the second supporting bracket 6 at the end of the first bracket intersecting the sliding direction d2. In particular, the holding surfaces 33, 36 are placed at the ends of the second bracket.

[0327] The second holding device 31 comprises a first holding element 32. The first holding element 32 is adjacent to the inlet portion 85 of the support 2 and distal to the outlet portion 86 of the support 2 relative to the first advancement path p2. The first holding element 32 comprises a first suction surface 33 configured to hold the object by suction ( Figure 5B The first suction surface 33 is flat. The first suction surface 33 is parallel to the second forward path p2, at least in the portion of the path located at the second holding device. The first suction surface 33 of the second holding device 31 is parallel to the first suction surface 23 of the first holding device 21. The first suction surface 33 includes a plurality of suction holes 34 positioned in fluid communication with a suction member (not shown). The suction member is external to the apparatus 1.

[0328] The first suction surface 33 is perpendicular to the second sliding direction d2.

[0329] The second holding device 31 includes a second holding element 35. The second holding element 35 is placed downstream of the first holding element 32 relative to the second forward path p2. The second holding element 35 of the second holding device 31 faces the second holding element 25 of the first holding device 21. The second holding element 35 includes a second suction surface 36. The second suction surface 36 is flat. The second suction surface 36 of the second holding device 31 is parallel to the second suction surface 26 of the first holding device 21. The second suction surface 36 includes a plurality of suction holes 37. The holes of the second suction surface 36 are placed so as to be in fluid communication with a suction member (not shown), which can also be connected to the suction holes 34 of the first suction surface 33. The second suction surface 36 is aligned with the first suction surface 33 along a direction perpendicular to the second forward path p2. At least in the portion of the path located at the second holding device, the second suction surface 36 is parallel to the second forward path p2. The second suction surface 36 is orthogonal to the second sliding direction d2.

[0330] The first suction surface 33 and the second suction surface 36 are coplanar.

[0331] The first suction surface 33 and the second suction surface 36 of the second holding device 31 are independently powered, allowing them to activate or deactivate suction independently of each other. For example, the first suction surface 33 and the second suction surface 36 are connected to the suction member via two separate connecting pipes, on which corresponding valves (not shown) are arranged. The valves are configured to be actuated independently of each other in a closed or open position.

[0332] The suction means may be common to the first holding device 21 and the second holding device 31 , actuating the activation and deactivation of the suction of the holding elements 22 , 25 , 32 , 35 by controlling the open and closed states of the corresponding valves.

[0333] In a specific embodiment, the holding surfaces 33 , 36 of the first holding element 32 and the second holding element 35 of the second holding device 31 have the same size and shape.

[0334] In an embodiment, the first holding element 32 and the second holding element 35 of the second holding device 31 are spaced apart from each other along a direction parallel to the second advancement path p2, thereby forming an opening 87b ( Figure 5B ).

[0335] The areas of the suction surfaces 23 , 26 of the first element 22 and the second element 25 of the first holding device 21 are preferably identical.

[0336] The areas of the suction surfaces 33 , 36 of the first element 32 and the second element 35 of the second holding device 31 are preferably identical.

[0337] At the first holding device 21 and the second holding device 31 , the first advancing path p1 and the second advancing path p2 are straight, the second advancing path p2 being parallel to the first advancing path p1 .

[0338] The first mobile device 3 and the second mobile device 5 are both movable between a remote position and a close position.

[0339] In the approach position of the first and second moving devices 3, 5, the first holding device 21 and the second holding device 31 are positioned relative to each other so that the first and second web sheets are aligned on a common deposition plane g. The deposition plane g is parallel to the plane defining the suction surfaces of the first and second holding devices (typically parallel to the advancement paths p1, p2, at least in the portion of the paths at the holding devices).

[0340] In the approximated position, for example, the first holding device and the second holding device are substantially in contact with each other and are at most separated by a distance of 1 mm to 4 mm (eg, 2 mm).

[0341] In the remote position of the first and second mobile devices 3 and 5, the first holding device 21 and the second holding device 31 are separated from each other. The so-called separation from each other means that the first holding device 21 and the second holding device 31 are separated by a distance of not less than 50 mm.

[0342] The device 1 further comprises a cutting mechanism 40 .

[0343] The cutting mechanism 40 includes a first rotating body 41 ( Figure 5A). The first rotating body 41 is rotatably mounted on the first holding device 21 around the rotation axis r1. The rotation axis r1 is perpendicular to the first sliding direction d1. The rotation axis r1 is also perpendicular to the first forward path p1. The first rotating body 41 is capable of rotating between a cutting abutment position and a non-operating position around the rotation axis r1, as described in detail below. The cutting abutment position and the non-operating position are angularly spaced 90° apart. The first rotating body 41 also has a channel opening 42 extending radially relative to the rotation axis r1. The channel opening 42 has a rectangular cross-section in a plane parallel to the rotation axis r1. In the non-operating position, the channel opening 42 is oriented parallel to the sliding direction d1 of the first support bracket 4. In the non-operating position, the channel opening 42 is open at the first holding device 21.

[0344] The cutting mechanism 40 includes a first reverse blade 43 ( Figure 5A 、 Figure 6 as well as Figure 7 ). The first reverse blade 43 has an expansion direction perpendicular to the first advancing path p1. The first reverse blade 43 can move along the first sliding direction d1 together with the first holding device 21. Figure 5A , the first rotating body 41 is illustrated in a cutting abutment position, wherein the first counter blade 43 faces outwardly relative to the opening 87a.

[0345] The first counter blade 43 is mounted on the first rotating body 41. The first counter blade 43 is oriented parallel to the rotation axis r1. The first counter blade 43 is fixed to the first rotating body 41 and is movable integrally about the rotation axis r1. In the cutting abutment position of the first rotating body 41, the first counter blade 43 is positioned against the first holding device 21. In this cutting abutment position, the first counter blade 43 is positioned between the first holding element 22 and the second holding element 25.

[0346] In the cutting abutment position of the first rotating body 41 , the first counter blade 43 is parallel to the first and second suction surfaces 23 , 26 , preferably coplanar therewith.

[0347] In the inoperative position of the first rotating body 41, the first counter blade 43 is spaced apart from the first and second holding elements 22, 25 and does not engage the passage opening 42. In particular, in said position, the first counter blade 43 is not coplanar with the first and second suction surfaces 23, 26.

[0348] The cutting mechanism 40 includes a second rotating body 44 ( Figure 1 、 Figure 5B 、 Figure 12-15). The second rotating body 44 is rotatably mounted on the second holding device 31 around the rotation axis r2. The rotation axis r2 is perpendicular to the second sliding direction d2 of the second bracket 6. The rotation axis r2 is also perpendicular to the second advance path p2. The second rotating body 44 is rotatable around the rotation axis r2 between a cutting abutment position and a non-operating position, as described in detail below. The cutting abutment position and the non-operating position are angularly spaced 90° apart. The second rotating body 44 also has a channel opening 45 extending radially relative to the rotation axis r2. The channel opening 45 has a rectangular cross-section in a plane parallel to the rotation axis r2. In the non-operating position, the channel opening 45 is oriented parallel to the sliding direction d2. In the non-operating position, the channel opening 45 is open at the second holding device 31. In Figure 5B , the second rotating body 44 is illustrated in a cutting abutment position, wherein the second counter blade 46 faces outwards.

[0349] The cutting mechanism 40 includes a second reverse blade 46 ( Figure 5B ). The second counter blade 46 is movable along the second sliding direction d2 together with the second holding device 31. The second counter blade 46 has a deployment direction perpendicular to the first advancement path p1.

[0350] A second reverse blade 46 is mounted on the second rotating body 44. The second reverse blade 46 is oriented parallel to the axis of rotation r2. The second reverse blade 46 is fixed to the second rotating body 44 and can move integrally around the axis of rotation r1. In the cutting abutment position of the second rotating body 44, the second reverse blade 46 is placed at the second holding device 31. In the cutting abutment position, the second reverse blade 46 is placed between the first holding element 32 and the second holding element 35. In the cutting abutment position, the second reverse blade 46 is parallel to the first suction surface 33 and the second suction surface 36, preferably coplanar with the first suction surface and the second suction surface. In the non-operating position of the second rotating body 44, the second reverse blade 46 is spaced apart from the first holding element 32 and the second holding element 35 and is not coplanar with the first suction surface 33 and the second suction surface 36.

[0351] exist Figure 5B , the first rotating body 44 is illustrated in the cutting abutment position, wherein the second counter blade 46 is rotated outwardly relative to the opening 87b.

[0352] The cutting mechanism 40 includes a cutting device 90 configured to selectively cut the first electrode web s1 held by the first holding device 21 and the second electrode web s2 held by the second holding device 31. The cutting device 90 includes a blade 47 ( Figure 2 、 Figure 4 、 Figure 7-10The blade 47 has a circular shape. The cutting device 90 includes an actuator arm 48 operatively connected to the blade 47 and configured to move the blade 47 along a cutting direction d3 ( Figure 4 The actuator arm 48 is slidably mounted on the fixed support 2 between the first moving device 3 and the second moving device 5. The actuator 48a is configured to move the arm 48 relative to the fixed support 2 along the cutting direction d3 ( Figure 4 The blade 47 can rotate around an axis parallel to the first advancing path p1 and the second advancing path p2.

[0353] Cutting direction d3 is perpendicular to first sliding direction d1 and second sliding direction d2. Cutting direction d3 is perpendicular to first advancing path p1 and second advancing path p2. Cutting direction d3 is parallel to first counter blade 43 and second counter blade 46. Cutting direction d3 is parallel to rotation axes r1 and r2 of first rotating body 41 and second rotating body 44. Blade 47 is rotatable about an axis perpendicular to cutting direction d3.

[0354] The cutting device 90 includes an actuating roller 49 ( Figure 2 and Figure 4 ). The blade 47 is mounted rotationally fixed to the actuator roller 49. In one embodiment, the blade 47 and the actuator roller 49 are mounted idlingly on the arm 48.

[0355] The actuator roller 49 is configured to roll against the first counter blade 43 when the first holding device 21 holding the first sheet s1 is arranged in the cutting position. Specifically, the actuator roller 49 slides across the first counter blade 43, thereby rotating the blade 47 that performs the cutting of the sheet s1. Similarly, when the second holding device 31 is arranged in the cutting position, which preferably coincides with the cutting position of the first holding device 21, the actuator roller 49 slides across the second counter blade 46, causing the blade 47 to rotate.

[0356] In other embodiments, the actuator roller 49 is motorized to rotate the blade 27 .

[0357] The cutting device 90 can be positioned in a rest position in which the blade 47 is not positioned between the first holding device 21 and the second holding device 31. The cutting device 90 is configured to perform a cutting stroke between the rest position and a plurality of activation positions. During the cutting stroke, the blade 47 is moved by the actuating arm 48 along the cutting direction d3 ( Figure 4 In the plurality of start positions, the blade 47 is interposed between the first holding device 21 and the second holding device 31. The cutting device 90 is further configured to perform a reset stroke in which the blade 47 returns to the rest position, wherein the reset stroke is opposite to the cutting direction.

[0358] The first movement device 3 is configured to position the first holding device 21 in a cutting position intermediate between the distal position and the proximal position. In the cutting position of the first holding device 21, during the cutting stroke, the blade 47 of the cutting device 90 is configured to cut the first electrode web s1 held by the first holding device 21 by sliding against the first counter-blade 43. The cut first electrode web s1 is divided into a first portion s1a continuous with the first electrode web roll 83 and a second portion s1b separate from the first electrode web roll 83. The first holding element 22 of the first holding device 21 is configured to hold the first portion s1a. The second holding element 25 of the first holding device 21 is configured to hold the second portion s1b. A first free end l1, transverse to and preferably perpendicular to the first advance path p1, is defined on the second portion s1b.

[0359] The first surface portion t1a is defined on the second portion s1b of the first sheet s1 adjacent to the first free end 11 and extending transversely between the longitudinal edges of the first electrode web f1 ( Figure 16A The second surface portion t1b is defined on the second portion s1b, adjacent to the first free end l1 and extending transversely on the side opposite to the first surface portion t1a, between the longitudinal edges of the first electrode web f1. Both the first surface portion t1a and the second surface portion t1b extend longitudinally and transversely on the first electrode web f1.

[0360] The second mobile device 5 is configured to arrange the second holding device 31 in a cutting position intermediate between the remote position and the approach position. The cutting position of the second holding device 31 can replace the cutting position of the first holding device 21. In the cutting position of the second holding device 31, the blade 47 is configured to cut the second electrode web s2 held by the second holding device 31 by sliding against the second counter blade 46 during the cutting stroke. The cut second electrode web s2 is divided into a first portion s2a continuous with the second rolled electrode web 84 and a second portion s2b separated from the second rolled electrode web 84. The first holding element 32 of the second holding device 31 is configured to hold the first portion s2a. The second holding element 35 of the second holding device 31 is configured to hold the second portion s2b. The second free end l2, which is transverse to and preferably perpendicular to the second advance path p2, is defined on the first portion s2a.

[0361] A first surface portion t2a is defined on the first portion s2a, adjacent to the second free end l2, and extending transversely between the longitudinal edges of the second electrode web f2. A second surface portion t2b is defined on the first portion s2a, adjacent to the second free end l2, and extending transversely between the longitudinal edges of the second electrode web f2 on the side opposite to the first surface portion t2a. The first and second surface portions t2a and t2b extend longitudinally and transversely on the first electrode web f2.

[0362] The apparatus 1 comprises an electrode web deflector 50. The deflector 50 is mounted on the fixed support 2. The deflector 50 is mounted at the outlet portion 86 of the fixed support 2 in an area where it does not engage the first and second support brackets 4, 6 in any position in which the moving devices 3, 5 are used.

[0363] The deflector 50 comprises a fork 51 having an axis of symmetry t (at Figure 1 ). The deflector 50 includes a pair of deflector rollers 52 mounted parallel to each other on the fork 51 at respective ends thereof that are opposite with respect to the axis of symmetry.

[0364] The deflector 50 is movable between a rest position, a first web intercepting position and a second web intercepting position. In the rest position, the forks 51 are arranged with the respective symmetry axes t parallel to the first and second advancement paths p1 and p2. Figure 1 and Figure 2 In the rest position illustrated in , the deflector roller 52 engages neither the first sheet of electrode web s1 nor the second sheet of electrode web s2 .

[0365] In the first intercepting position, the deflector 50 is configured to engage the first electrode web s1 and bring it closer to the first holding device 21. Specifically, the fork 51 is rotated relative to the rest position and is arranged such that the corresponding symmetry axis t is aligned relative to the first and second advancement paths p1 and p2 (at Figure 7 In the first intercepting position, one of the deflector rollers 52 is configured to press the first electrode web s1 against the first holding device 21. In this way, the cutting device 90 can cut the second electrode web s2 without the risk of joining the first electrode web s1.

[0366] In the second interception position ( Figure 3In the second intercepting position, the deflector rollers 52 are configured to engage the second electrode web s2 and bring it closer to the second holding device 23. Specifically, the forks 51 are rotated relative to the rest position and arranged so that the corresponding symmetry axes t are tilted relative to the first and second advancement paths p1 and p2 on opposite sides relative to the first intercepting position. In the second intercepting position, the other of the deflector rollers 52 is configured to press the second electrode web s2 against the second holding device 31. In this way, the cutting device 40 can cut the first electrode web s1 without risking engaging the second electrode web s2.

[0367] The apparatus 1 further comprises a bonding device 60 configured to bond the first free end 11 to the second free end 12. In this way, the first portion s1a of the first electrode web s1 is joined to the second portion s2b of the second electrode web s2. The bonding device 60 is active in the bonding area A ( Figure 1 、 Figure 4 as well as Figure 7 The first holding device 21 is configured to hold the first free end portion 11 at the bonding area A during bonding. The second holding device is configured to hold the second free end portion 12 at the bonding area A during bonding, the second free end portion being positioned at the first free end portion 11 during bonding.

[0368] The bonding device 60 includes a first applicator 60a ( Figure 1 and Figure 12 ). The first applicator 60a is mounted on the first support bracket 4. The first applicator 60a is configured to cooperate with the first holding device 21.

[0369] The first applicator 60a is configured to apply a first connecting element 60b at the first free end 11 and the second free end 12, and specifically, to the first surface portion t1a of the second portion s1b of the first electrode web s1 and to the first surface portion t2a of the first portion s2a of the second electrode web s2. In the illustrated embodiment, the first connecting element 60b is an adhesive element, and specifically a first adhesive patch 69b.

[0370] Reference Figures 12 to 15 The first applicator 60a includes a first adhesive tape roll support 61 configured to support a first adhesive tape supply roll b1 and unwind a first adhesive tape n1 from the first supply roll b1 to provide an unwound first sheet of adhesive tape b1a. The first adhesive tape roll support 61 is preferably rotatably mounted on the first support bracket 4.

[0371] The first applicator 60a includes a first guide roller 62 (at Figure 1 、 Figure 6 and Figure 13 ), the first guide roller 62 is configured to be arranged along the first web unwinding path 63 ( Figure 12-15 ) guides the first adhesive tape b1a to be unwound from the first supply roll b1. The first web unwinding path 63 has a section parallel to the first advance path p1 of the first electrode web s1. The first unwinding path 63 is opposite the first advance path p1 relative to the first holding device 21. Along the first unwinding path 63, the first adhesive tape b1a has its adhesive side facing the first holding device 21.

[0372] The first applicator 60a includes a first punching base 64. The first punching base 64 has a punching surface parallel to the first web unwinding path 63. The first punching base 64 is fixed to the first support bracket 4. The first punching base 64 has a punching opening 65. In the non-operating position of the first rotating body 41, the passage opening 42 of the first rotating body 41 is aligned with the punching opening 65 and is accessible from the punching opening 65 ( Figure 6 Preferably, the punching opening 65 has substantially the same shape and cross-sectional size as the passage opening 42 of the first rotating body 41 .

[0373] The first applicator 60a includes a first punch 66. The first punch 66 is movably mounted on the first support bracket 4. The first punch 66 is movable along a first punching direction 66a that is transverse to the first unwinding path 63. The first punching direction 66a is perpendicular to the first advancing path p1 and parallel to the first sliding direction d1 of the first support bracket 4.

[0374] The first punch 66 includes a peripheral cutting edge 67. The peripheral cutting edge 67 is rectangular. The peripheral cutting edge 67 is substantially opposite in shape to the punch opening 65 so that it can pass through it flush, for example, with a margin of no more than 0.04 mm relative to the sides of the punch opening 65. The first punch 66 is also substantially opposite in shape to the passage opening 42 so that it can pass through it flush. The first punch 66 is configured to cut the first piece of adhesive tape b1a between the peripheral cutting edge 67 and the edge of the punch opening 65.

[0375] The first punch 66 includes a suction surface 68 (at Figure 6 、 Figure 12 and Figure 14 The suction surface 68 of the first punch 66 is configured to apply vacuum suction to the first adhesive patch 69b cut from the first adhesive tape b1a to retain it. The suction surface 68 of the first punch 66 includes a plurality of suction holes in fluid communication with a suction member (not shown). The suction surface 68 of the first punch 66 is surrounded by a peripheral cutting edge 67.

[0376] The first punch 66 is movable between a rest configuration and an applying configuration.

[0377] In the rest configuration, the first punch 66 is not engaged with the first web unwinding path 63 .

[0378] In the application configuration, the first punch 66 is configured to apply the first cutting adhesive patch 69b to the first free end l1 and the second free end l2, which are held by the first holding device 21 and the second holding device 31 and are placed in a close position at the bonding area A.

[0379] Between the rest configuration and the application configuration, the first punch 66 can be moved into a punching position in which, preferably without stopping, the first punch 66 engages the first unwinding path 63 to cut an inner portion from the unwound first sheet of adhesive tape b1a, thereby separating the inner portion from the remaining edge portion 69a extending along the first web unwinding path 63.

[0380] The first punch 66 is configured to cut the first adhesive tape b1a while maintaining the connection between the first portion n1a upstream of the first adhesive tape n1 and the second portion n1b downstream of the first adhesive tape n1. In other words, the first punch 66 is configured to cut the inner portion without completely cutting off the first adhesive tape b1a. The first punch 66 has a width measured transversely to the first unwinding path 63 that is less than the width of the first adhesive tape b1a. The inner portion cut off by the first punch 66 forms a first adhesive patch 69b ( Figure 12 、 Figure 14 、 Figure 15 ).

[0381] In the inoperative position, the first punch 66 is movable between a rest configuration and an applying configuration through the punching opening 65 and the passage opening 42 of the first rotating body 41. The first punching opening 66 is configured to hold the first adhesive patch 69b between the punching position and the applying configuration.

[0382] The first applicator 60a includes a first winder 69. The first winder 69 is rotatably mounted on the first support bracket 4. The first winder 69 is configured to wind a remaining edge portion 69a of the first adhesive tape n1 downstream of the first unwinding path 63. The first winder 69 is configured to tension the first adhesive tape b1a between the first supply reel b1 and the first winder 69 so that the first adhesive tape is stretched on the first stamping base 64 during stamping. The remaining portion 69a wound on the first winder 69 is at least partially composed of stamping waste of the first adhesive tape b1a, that is, the remaining edge portion 69a of the first adhesive tape n1.

[0383] exist Figure 17The figure schematically illustrates the path of the first adhesive tape n1, but it could also represent the path of the second adhesive tape n2. From left to right in the figure, in the direction n of the path of the first adhesive tape n1, a first sheet of adhesive tape b1a is unwound from a first supply roll b1 and intercepted by a first punch 66 (position P). This punch cuts off the first adhesive patch 69b, leaving a frame-shaped remainder 69a. This remainder 69a allows for continuity in the unwound web before and after punching. After punching 66, the web formed by the remaining edge portion 69a is wound onto a first winder 69.

[0384] The bonding device 60 comprises a second applicator 70a. The second applicator 70a is mounted on the second support bracket 6. The second applicator 70a is configured to cooperate with the second holding device 31.

[0385] The second applicator 70a is configured to apply a second connecting element 70b at the first free end 11 and the second free end 12, and specifically to the second surface portion t1b of the second portion s1b of the first electrode web s1 and to the second surface portion t2b of the first portion s2a of the second electrode web s2. In the illustrated embodiment, the second connecting element 70b is an adhesive element, and specifically a second adhesive patch 79b.

[0386] The second applicator 70a includes a second adhesive tape roll support 71 configured to support a second adhesive tape supply roll b2 and unwind a second adhesive tape n2 from the second supply roll b2 to provide an unwound second sheet of adhesive tape b2a. The second adhesive tape roll support 71 is preferably rotatably mounted on the second support bracket 6.

[0387] The second applicator 70a includes a second guide roller 72 configured to guide the second adhesive tape b2a unwound from the second supply roll b2 along a second web unwinding path 73. The second web unwinding path 73 has a section parallel to the second advance path p2 of the second electrode web s2. The second web unwinding path 73 is opposite the second advance path p2 relative to the second holding device 31. Along the second web unwinding path 73, the second adhesive tape b2a has its adhesive side facing the second holding device 31.

[0388] The second applicator 70a includes a second punching base 74. The second punching base 74 has a punching surface parallel to the second web unwinding path 73. The second punching base 74 is fixed to the second support bracket 6. The second punching base 74 has a punching opening 75. In the non-operating position of the second rotating body 44, the passage opening 45 of the second rotating body 44 is aligned with the punching opening 75 and can be accessed from the punching opening 75. Preferably, the punching opening 75 has substantially the same shape and cross-sectional dimensions as the through opening 45 of the first rotating body 44.

[0389] The second applicator 70a includes a second punch 76. The second punch 76 is movably mounted on the second support bracket 6. The second punch 76 is movable along a second punching direction 76a that is transverse to, and preferably perpendicular to, the second web unwinding path 73. The second punching direction 76a is perpendicular to the second advancement path p2. The second punching direction 76a is parallel to the second sliding direction d2 of the second support bracket 6.

[0390] The second punch 76 includes a peripheral cutting edge 77. The peripheral cutting edge 77 is rectangular. The peripheral cutting edge 77 is substantially opposite in shape to the punch opening 75 so that it can pass through it flush with the punch opening. The second punch 76 is also substantially opposite in shape to the passage opening 45 so that it can pass through it flush with the punch opening. The second punch 76 is configured to cut the second piece of adhesive tape b2a between the peripheral cutting edge 77 and the edge of the punch opening 75.

[0391] The second punch 76 includes a suction surface 78 configured to vacuum a second adhesive patch 79b that is cut from the second adhesive tape b2a to hold it. The suction surface 78 of the second punch 76 includes a plurality of suction holes that are in fluid communication with a suction member (not shown). The suction surface 78 of the second punch 76 is surrounded by a peripheral cutting edge 77.

[0392] The second punch 76 is movable between a rest configuration and an applying configuration.

[0393] In the rest configuration, the second punch 76 is not engaged with the second web unwinding path 73 .

[0394] Between the rest configuration and the application configuration, the second punch 76 is preferably arranged in a punching position without stopping, in which the second punch 76 engages the second web unwinding path 73 to cut off the inner portion of the adhesive tape from the unwound second sheet adhesive tape b2a, thereby separating the inner portion from the remaining edge portion (not shown) extending along the second web unwinding path 73. The remaining edge portion of the second adhesive tape n2 is similar to the remaining edge portion 69a of the first adhesive tape n1. The second punch 76 is configured to cut the second sheet adhesive strip b2a while keeping the first portion n2a upstream of the second adhesive strip n2 connected to the second portion n2b downstream of the second adhesive strip n2. In other words, the second punch 76 is configured to cut off the inner portion without completely cutting off the second sheet adhesive tape b2a. The second punch 76 has a width measured transversely to the second web unwinding path 73, which is less than the width of the second sheet adhesive tape b2a. The inner portion cut off by the second punch 76 forms a second adhesive patch 79b ( Figure 12 、 Figure 14 、 Figure 15 ).

[0395] In the applying configuration, the second punch 76 is configured to apply the second cut adhesive patch 79 b to the first free end portion 11 and to the free end portion 12 , the first free end portion 11 and the free end portion 12 being held by the first holding device 21 and by the second holding device 31 , placed in a proximal position at the bonding area A. Preferably, the second punch 76 is configured to apply the second adhesive patch 79 b on opposite sides of the first and second electrode webs s1 and s2 simultaneously with the application of the first adhesive patch 69 b by the first punch 66 .

[0396] In the inoperative position, the second punch 76 is movable between a punching position and a bonding configuration through the punching opening 75 and the passage opening 45 of the second rotating body 44. The second punch 76 is configured to hold the second adhesive patch 79b between the punching position and the applying configuration.

[0397] The second applicator 70a includes a second winder 79. The second winder 79 is rotatably mounted on the second support bracket 6. The second winder 79 is configured to wind the remaining edge portion of the second adhesive tape n2 downstream of the second web unwinding path 73. The second winder 79 is configured to tension the second adhesive tape n2 between the second supply roll b2 and the second winder 79 so that the second adhesive tape is stretched on the second stamping base 74 during stamping. The remaining portion wound on the second winder 79 is at least partially composed of stamping waste from the second adhesive tape b2a.

[0398] Figures 18 to 21It refers to a further embodiment of the device according to the invention for joining a first electrode web to a second electrode web for carrying out a change of electrode web rolls for producing electrochemical cells.

[0399] Figures 18-21 The device 1 is similar to the above described device and additionally has a spacer 100 mounted on a fixed support 2. The spacer 100 is rotatably mounted around a spacer rotation axis r3 ( Figure 18 ). The spacer rotation axis r3 is perpendicular to the first sliding direction d1 and the second sliding direction d2.

[0400] The spacer 100 is shaped substantially rectangular in a plane in a view orthogonal to the spacer rotation axis r3 and includes two short sides 100 a parallel to each other and two long sides 100 b parallel to each other and perpendicular to the short sides 100 a .

[0401] The spacer 100 is in the first abutment position ( Figure 20 ) and the second abutment position ( Figure 19 and Figure 21 ) are rotatable.

[0402] The spacer 100 includes two first adjusting screws 101. The first adjusting screws 101 are tightenable and loosenable perpendicular to the spacer rotation axis r3. Each first adjusting screw 101 is placed on its own short side 100a.

[0403] A first abutment surface 101a is defined on each first adjustment screw 101. The two first abutment surfaces 101a are parallel to each other. The two first abutment surfaces 101a are placed Figure 19 The first distance 101d can be adjusted by tightening or loosening one or both of the first adjustment screws 101.

[0404] The spacer 100 includes two second adjustment screws 102. The second adjustment screws 102 are tightenable and loosenable perpendicularly to the spacer rotation axis r3. The second adjustment screws 102 are tightenable and loosenable in a direction perpendicular to the tightening and loosening directions of the first adjustment screws 101. Each second adjustment screw 102 is located on a corresponding long side 100b.

[0405] Each second adjusting screw 102 defines a second abutment surface 102a. The two second abutment surfaces 102a are parallel to each other. The two second abutment surfaces 102a are perpendicular to the first abutment surface 101a. The two second abutment surfaces 102a are positioned at a second distance 102d from each other. The second distance 102d can be adjusted by tightening or loosening one or both of the second adjusting screws 102. The second distance 102d is perpendicular to the first distance 101d. Regardless of the adjustment of the first adjusting screw 101 and the second adjusting screw 102, the second distance 102d between the second abutment surfaces 102a is smaller than the first distance 102d between the first abutment surfaces 101a.

[0406] In the first abutment position ( Figure 20 ), the first distance 101d between the first abutment surfaces 101a is oriented parallel to the first sliding direction d1 and the second sliding direction d2. In the first abutment position, the second distance 102d between the second abutment surfaces 102a is oriented perpendicular to the first sliding direction d1 and the second sliding direction d2.

[0407] In the second abutment position ( Figure 21 ), the second distance 102d between the second abutment surfaces 102a is oriented parallel to the first sliding direction d1 and the second sliding direction d2. In the second abutment position, the first distance 101d between the second abutment surfaces 101a is oriented perpendicular to the first sliding direction d1 and the second sliding direction d2.

[0408] The first abutment location and the second abutment location are angularly spaced 90° apart.

[0409] The first stopping member 103 is fixed to the first moving device 3 , in particular to the first supporting bracket 4 , so as to move integrally with the first holding device 21 along the first sliding direction d1 .

[0410] The first stop member 103 comprises a block 103a fixed to the first supporting bracket 4 and an adjustment device 103b movable relative to the block 103a parallel to the first sliding direction d1. In the illustrated embodiment, the adjustment device 103b is a screw threadedly engaged with a hole obtained in the block 103a.

[0411] The first stop member 103 includes a first stop surface 104 defined at one end of an adjustment device 103b. The first stop surface 104 is orthogonal to the first sliding direction d1. The adjustment device 103b allows the position of the first stop surface 104 along the first sliding direction d1 to be adjusted, in particular by tightening or loosening a screw in a corresponding hole.

[0412] like Figure 20As shown in FIG, the first stop surface 104 is configured to abut against one of the first abutment surfaces 101 when the spacer 100 is in the first abutment position to stop the first moving device 3 in the cutting position. By adjusting the position of the first stop surface 104 and the corresponding first abutment surface 101a, the position of the first holding device 21 in the cutting position relative to the cutting device 90 can be precisely adjusted.

[0413] like Figure 21 As shown, the first stop surface 104 is configured to abut against one of the second abutment surfaces 102a when the spacer 100 is in the second abutment position to stop the first mobile device 3 in the approximation position. By adjusting the position of the first stop surface 104 and the corresponding second abutment surface 102a, the position of the first holding device 21 in the approximation position can be precisely adjusted.

[0414] The second stop member 105 is fixed to the second moving device 5, in particular to the second supporting bracket 6, so as to move integrally with the second holding device 31 along the second sliding direction d2. The second stop member 105 is similar to the first stop member 103.

[0415] The second stop member 105 comprises a block 105a fixed to the second supporting bracket 6 and an adjustment device 105b movable relative to the block 105a parallel to the second sliding direction d2. In the embodiment shown, the adjustment device 105b is a screw threadedly engaged with a hole obtained in the block 105a.

[0416] The second stop member 105 includes a second stop surface 106 defined at one end of an adjustment device 105b. The second stop surface 106 is orthogonal to the second sliding direction d2. The adjustment device 105b allows the position of the second stop surface 106 to be adjusted along the second sliding direction d2, in particular by tightening or loosening a screw in a corresponding hole.

[0417] Similar to the first stop surface 104, the second stop surface 106 is configured to abut against one of the first abutment surfaces 101a when the spacer 100 is in the first abutment position to stop the second moving device 5 in the cutting position. By adjusting the position of the second stop surface 106 and the corresponding first abutment surface 101a, the position of the second holding device 31 in the cutting position relative to the cutting device 90 can be accurately adjusted.

[0418] like Figure 21As shown in FIG, the second stop surface 106 is configured to abut against one of the second abutment surfaces 102a when the spacer 100 is in the second abutment position, thereby stopping the second mobile device 5 in the approximated position. By adjusting the positions of the second stop surface 106 and the corresponding second abutment surface 102a, the position of the second holding device 31 in the approximated position can be precisely adjusted. Therefore, the distance between the first holding device 21 and the second holding device 31 can be adjusted in various approximated positions.

[0419] In a method for joining a first electrode web to a second electrode web for implementing a replacement of an electrode web roll for producing an electrochemical cell, a first electrode web f1 partially unwound from a first electrode web roll 83 is provided. The first electrode web f1 comprises a first sheet of electrode web s1 of unwound web. The first sheet of electrode web s1 is defined by a first portion s1a and a second portion s1b and is arranged along a first advancement path p1 ( Figure 7 ).

[0420] By rotating the first electrode web roll 83 , the first electrode web f1 is fed along a first advancement path p1 to a forming station of an electrochemical cell (downstream of the apparatus 1 and not shown).

[0421] When the first electrode web f1 is fed to the forming station, a second electrode web f2 partially unwound from a second roll of electrode web 84 (preferably a new roll) is provided. The second electrode web f2 comprises an unwound second sheet of electrode web s2 defined by a first portion s2a and a second portion s2b. The second sheet of electrode web s2 is arranged along a second advancement path p2.

[0422] To provide the second electrode web f2, the second electrode web f2 is unwound along the second advance path p2 by rotating the second electrode web roll 84. The longitudinal end of the second electrode web f2 unwound from the second electrode web roll 84, positioned upstream from the second electrode web s2, is secured to the second electrode web winder 16. This operation can be performed manually by an operator. By winding the second end onto the second electrode web winder 16, a predetermined pulling force is applied to the second electrode web s2, tensioning the second electrode web s2 along the second advance path p2.

[0423] Subsequently, the unwinding of the second electrode web roll 84 is stopped. When the second electrode web roll 84 is stopped, the second electrode web f2 includes a second electrode web s2 ( Figure 7 ).

[0424] Figure 16 According to the preferred embodiment Figure 7 The diagram is a conceptual representation of the operational steps to highlight some geometric relationships between the main elements of the method.

[0425] The first electrode web s1 is arranged along a first advancing path p1 and the second electrode web s2 is arranged along a second advancing path p2, with the advancing paths p1 and p2 arranged side by side. Specifically, the advancing paths p1 and p2 are arranged in parallel at at least a first holding device and a second holding device, which hold the first electrode web s1 and the second electrode web s2.

[0426] The cutting direction d3 is located at Figure 16 The positions of the holding device (ie the distal position, the approach position and the cutting position) belong to the planar segment denoted by v in the figure, the plane of which includes the direction d3 and is perpendicular to the advancement paths p1, p2.

[0427] Subsequently, a first portion s2a of a second electrode web s2 having a second free end portion 12 is provided ( Figure 8 ). The second free end 12 is transverse and preferably perpendicular relative to the second advancement path p2.

[0428] In order to provide the first portion s2a of the second electrode web s2 with a second free end portion 12, the second electrode web s2 is held by means of a second holding device 31. Both the first portion s2a and the second portion s2b of the second electrode web s2 are held.

[0429] Specifically, the first portion s2a is held by means of the first holding element 32, and the second portion s2b is held by means of the second holding element 35. While the first portion s2a and the second portion s2b of the second sheet of electrode web s2 are held, the second sheet of electrode web s2 is cut to physically separate the first portion s2a of the second sheet of electrode web s2 from the second portion s2b of the second sheet of electrode web s2.

[0430] In order to cut the second sheet of electrode web s2, the second holding device 31 is moved from the remote position to the cutting position. This is done by continuing to hold both the first portion s2a and the second portion s2b of the second sheet of electrode web s2.

[0431] exist Figures 18 to 21 In the embodiment of the present invention, before the second holding device 31 is moved from the remote position to the cutting position, the spacer 100 is arranged in the first abutment position. When the second stop member 105 abuts against the spacer 100, in particular when the second stop surface 106 abuts against the corresponding first abutment surface 101a, the second holding device 31 is stopped in the cutting position by moving from the remote position to the cutting position.

[0432] While the second electrode web s2 is being cut, the first holding device 21 remains in a remote position.

[0433] In order to cut the second electrode web s2, a cutting stroke is performed by the cutting device 90. The blade 47 is made to slide against the second counter-blade 46 between a plurality of activation positions.

[0434] The cutting position of the second holding device corresponds to the position of the blade 47 which, in the activated position of the cutting device 90, slides in a direction d3 perpendicular to the sliding directions d1, d2 of the holding device ( Figure 4 and Figure 16 ).

[0435] By cutting the second electrode web s2 , a second free end portion s2 a of the first portion s2 a of the second electrode web s2 is formed.

[0436] Preferably, when cutting the second electrode web s2, the deflector 50 presses the first electrode web s1 against the first holding device 21 to keep it spaced apart from the blade 47 ( Figure 8 ).

[0437] During cutting of the second sheet of electrode web s2 , the second rotating body 44 is arranged in a cutting abutment position in which the second counter blade 46 is placed between the first holding element 33 and the second holding element 35 .

[0438] Subsequently, the second free end portion 12 of the first portion s2a of the second electrode web s2 is held by the second holding device 31. This is accomplished by continuing to hold the first portion s2a with the first holding element 32 after cutting the second electrode web s2. After cutting, the second portion s2b of the second electrode web s2 is removed so as to disengage the second holding element 35 ( Figure 9 ).

[0439] Preferably, the first portion s2a of the second electrode web s2 is provided with the second free end portion 12 before the second portion s1b of the first electrode web s1 is provided with the first free end portion 11 .

[0440] The second portion s1b of the first electrode web s1 is provided with a first free end 11. The first free end 11 is transverse and preferably perpendicular to the first advancement path p1.

[0441] To provide a second portion s1b of the first electrode web s1 having a first free end l1, unwinding of the first rolled electrode web 83 is stopped. Upon stopping the first rolled electrode web 83, the first electrode web f1 comprises the unwound first electrode web s1. Subsequently, both the first portion s1a and the second portion s1b of the first electrode web s1 are held by a first holding device 21. The first portion s1a is held by a first holding element 22, and the second portion s1b is held by a second holding element 25. While the first portion s1a and the second portion s1b of the first electrode web s1 are held, the first electrode web s1 is cut to physically separate the first portion s1a from the second portion s1b of the first electrode web s1.

[0442] The first free end portion of the second portion s1 b of the first electrode web s1 is formed by cutting the first electrode web s1 .

[0443] In this way, the first portion s2a of the second electrode web f2 is positioned upstream of the second portion s1b of the first electrode web f1 with respect to the advancement path of the respective webs.

[0444] In order to cut the first sheet of electrode web s1 , the first holding device 21 is moved from the remote position to the cutting position. This is done by continuing to hold both the first portion s1a and the second portion s1b of the first sheet of electrode web s1 .

[0445] exist Figures 18 to 21 In the embodiment of the present invention, before the first holding device 21 is moved from the distance position to the cutting position, the spacer 100 is arranged in the first abutment position. When the first stop member 103 abuts against the spacer 100, in particular when the first stop surface 104 abuts against the corresponding first abutment surface 101a, the first holding device 21 is stopped in the cutting position by moving from the distance position to the cutting position.

[0446] While the first sheet of electrode web s1 is being cut, the second holding device 31 is kept in a remote position.

[0447] In order to cut the first sheet of electrode web s1 , a cutting stroke is performed by the cutting device 90. The blade 47 is made to slide against the first counter-blade 43 between a plurality of activation positions.

[0448] Preferably, the deflector 50 presses the second sheet of electrode web s2 against the second holding device 31 to keep it spaced apart from the blade 47 while the first sheet of electrode web s1 is being cut.

[0449] During cutting of the first electrode web s1 , the first rotating body 41 is arranged in a cutting abutment position in which the first counter blade 43 is placed between the first holding element 22 and the second holding element 25 .

[0450] Subsequently, the first free end portion 11 of the second portion s1b of the first electrode web s1 is held by the first holding device 21 (specifically, by the second holding element 25). The first portion s1a of the first electrode web s1 is removed by cutting so as to be disengaged from the first holding element 22 ( Figure 10 ).

[0451] Subsequently, a second free end 12 is provided at the first free end 11 .

[0452] Preferably, the free ends face each other in head-to-head alignment.

[0453] Preferably, the first free end and the second free end are arranged at a mutual distance smaller than or equal to 10 mm, preferably smaller than or equal to 6 mm, even more preferably smaller than or equal to 3 mm.

[0454] Preferably, the first free end and the second free end have a mutual distance of not less than 1 mm, for example comprised between 1 mm and 2 mm. The small distance between the free ends l1, l2 of the web and therefore between the individual holding devices on the placement plane g makes it possible to avoid any collisions between the components.

[0455] However, the present invention may include an embodiment in which the first free end portion 11 and the second free end portion 12 are in direct contact with each other.

[0456] To provide the first free end l1 aligned with the second free end l2, the first holding device 21 and the second holding device 31 are moved into proximity with each other so that the first free end l1 of the second portion s1b of the first sheet s1 and the second free end l2 of the first portion s2a of the second sheet of electrode web s2 are brought into proximity with each other. The first holding device 21 and the second holding device 31 are brought into respective proximity positions to position the second portion s1b of the first sheet of electrode web s1 against the first portion s2a of the second sheet of electrode web s2.

[0457] exist Figures 18-21In the embodiment of the present invention, before the first holding device 21 and the second holding device 31 are moved to the respective approximated positions, the spacer 100 is placed in the second abutment position by rotating the spacer 100 90°. When the first stop member 103 and the second stop member 105 abut against the spacer 100, in particular, when the first stop surface 104 abuts against the respective second abutment surface 102a and the second stop surface 106 abuts against the other abutment surface 102a, the first holding device 21 and the second holding device 31 stop in the approximated position.

[0458] Preferably, the first free end 11 and the second free end 12 are brought close to each other without overlapping the first sheet s1 and the second sheet s2 of electrode web or vice versa so as to have a head-to-head alignment between the first and second electrode webs f1 , f2.

[0459] Subsequently, the first portion s1a of the first electrode web s1 is bonded to the second portion s2a of the second electrode web s2. To bond the first portion s1a of the first electrode web s1 to the second portion s2a of the second electrode web s2, at least a first adhesive patch 69b is applied to the first free end 11 and the second free end 12. Preferably, the first adhesive patch 69b is applied by means of a first applicator 60a and the second adhesive patch 79b is applied by means of a second applicator 70a.

[0460] To bond the first electrode web f1 to the second electrode web f2, the first adhesive tape n1 is unwound from the first supply roll b1 along the first unwinding path 63. The first adhesive tape n1 includes an unwound first piece of adhesive tape b1a positioned along the first unwinding path 63 between a first portion n1a upstream of the first adhesive tape n1 and a second portion n1b downstream of the first adhesive tape n1.

[0461] To unwind the first adhesive tape n1 , a first piece of adhesive tape b1 a is arranged between the first punch 66 and the first punch base 64 .

[0462] Subsequently, the inner portion of the adhesive tape is cut from the first adhesive tape b1a. This separates the inner portion from the remaining edge portion 69a extending along the first unwinding path 63. Consequently, the remaining edge portion 69a connects the first portion n1a of the first adhesive tape n1 to the second portion n1b of the first adhesive tape n1. The inner portion forms a first adhesive patch 69b.

[0463] When the inner portion is cut from the first sheet of adhesive tape b1a, the first adhesive tape n1 is tensioned between the first winder 69 and the first supply roll b1. To tension the first adhesive tape n1, a pulling force is applied to the remaining edge portion 69a thereof.

[0464] After cutting the first electrode web s1 of the first electrode web f1 and the second electrode web s2 of the second electrode web f2 and before cutting the inner portion from the first adhesive tape b1a , the first rotating body 41 switches from the cutting abutment position to the non-operating position.

[0465] In order to cut out the inner portion from the first sheet of adhesive strip b1 a , the first sheet of adhesive strip b1 a is punched out by means of a first punch 66 .

[0466] Subsequently, the first adhesive patch 69b is applied to both the first free end portion 11 and the second free end portion 12. To apply the first adhesive patch 69b, the first adhesive patch 69b is held on the suction surface 68 of the first punch 66 by a suction action applied to the first adhesive patch 69b via the suction surface 68. While holding the first adhesive patch 69b, the first punch 66 moves along the first punching direction 66a until it reaches the first free end portion 11 and the second free end portion 12. Preferably, the first adhesive patch 69b is cut and applied with a single, uninterrupted, straight movement of the first punch 66 along the first punching direction 66a toward the first piece of adhesive tape b1a and until it reaches the first free end portion 11 and the second free end portion 12.

[0467] During the movement of the first punch 66 toward the first piece of adhesive tape b1a and until it reaches the first free end l1 and the second free end l2, in the non-operating position, the first punch 66 is inserted into the punching opening 65 of the first punching base 64 and into the channel opening 42 of the first rotating body 41.

[0468] Subsequently, the first adhesive patch 69b completes retention to the first punch 66 and the first punch 66 is retracted into the rest configuration.

[0469] Subsequently, the remaining edge portion 69 a of the first adhesive tape n1 is wound around the first winder 69 .

[0470] Furthermore, to bond the first electrode web f1 to the second electrode web f2, the second adhesive tape n2 is unwound from the second supply roll b2 along the second web unwinding path 73. The second adhesive tape n2 includes an unwound second piece of adhesive tape b2a located between a first portion n2a upstream of the second adhesive tape n2 and a second portion n2b downstream of the second adhesive tape n2 along the second web unwinding path 73.

[0471] In order to unwind the second adhesive tape n2 , the second piece of adhesive tape b2 a is arranged between the second punch 76 and the second punch base 74 .

[0472] Subsequently, the inner portion of the adhesive tape is cut from the second adhesive tape b2a. This inner portion is separated from the remaining edge portion extending along the second web unwinding path 73. The remaining edge portion thus connects the first portion n2a of the second adhesive tape n2 to the second portion n2b of the second adhesive tape n2. The inner portion forms the second adhesive patch 79b.

[0473] When the inner portion is cut from the second sheet of adhesive tape b2a, the second adhesive tape n2 is tensioned between the second winder 79 and the second supply roll b2. To tension the second adhesive tape n2, a pulling force is applied to the remaining edge portion thereof.

[0474] After cutting the first electrode web s1 of the first electrode web f1 and the second electrode web s2 of the second electrode web f2 and before cutting the inner portion from the first adhesive strip b1a , the second rotating body 44 switches from the cutting abutment position to the non-operating position.

[0475] In order to cut out the inner portion from the second sheet of adhesive tape b2a, the second sheet of adhesive tape b2a is punched out by means of a second punch 76.

[0476] Subsequently, a second adhesive patch 79b is applied at both the first free end 11 and the second free end 12.

[0477] To apply the second adhesive patch 79b, the second adhesive patch 79b is held on the suction surface 78 of the second punch 76 by a suction action applied to the second adhesive patch 79b via the suction surface 78. While holding the second adhesive patch 79b, the second punch 76 is moved along the second punching direction 76a until it reaches the first free end 11 and the second free end 12. Preferably, the second adhesive patch 79b is cut and applied with a single, uninterrupted, straight movement of the first punch 76 along the second punching direction 76a toward the second piece of adhesive tape b2a and until it reaches the first free end 11 and the second free end 12.

[0478] During the movement of the second punch 76 towards the second length of adhesive tape b2a and until it reaches the first free end 11 and the second free end 12, in the non-operating position, the second punch 76 is inserted into the punching opening 75 of the second punching base 74 and into the channel opening 45 of the second rotating body 44.

[0479] Subsequently, the second adhesive patch 79b completes retention to the second punch 76 and the second punch 76 is retracted into the rest configuration.

[0480] Subsequently, the remaining edge portion of the second adhesive tape n2 is wound on the second winder 79 .

[0481] After bonding between the second portion s1b of the first electrode web s1 and the first portion s2a of the second electrode web s2, the second portion s1a of the first electrode web s1 is released from the first holding device 21 and the first portion s2a of the second electrode web s2 is released from the second holding device 31.

[0482] Preferably, simultaneously with the first adhesive patch 69b, the second adhesive patch 79b is applied to the first free end portion 11 and the second free end portion 12 on the opposite side relative to the first adhesive patch 69b.

[0483] After cutting the first and second adhesive patches 69b and 79b, the first and second adhesive patches 69b and 79b are held by the respective suction surfaces of the first and second punches 66 and 76, and the first and second punches simultaneously apply the respective adhesive patches 69b and 79b to respective opposite sides of the second portion s1b of the first electrode web s1 and the first portion s2a of the second electrode web s2. Specifically, the first and second punches 66 and 76 simultaneously perform uninterrupted linear movements along the first and second punching directions 66a and 76a. The first and second punching directions 66a and 76a are aligned and have opposite directions.

[0484] In this way, the first punch 66 serves as an abutment element for the second punch 76 and vice versa.

[0485] It can also be observed that the electrodes tend to be very dusty and sometimes even greasy. As a result, the web tends to separate from the adhesive at the roller. Applying adhesive tape on both sides of the end portion of the electrode web improves the sealing of the joint.

[0486] Those skilled in the art will realize that different features of the embodiments described above can be combined to obtain further embodiments, all of which fall within the scope of the invention as defined by the accompanying claims.

Claims

1. A method for joining a first electrode web to a second electrode web for performing a change of electrode web rolls for producing an electrochemical cell, comprising: - providing a first free end portion (l1) of a first electrode web (n1), said first electrode web (f1) comprising a first surface portion (t1a) extending from said first free end portion (l1) and a second surface portion (t1b) extending from said first free end portion (l1) opposite said first surface portion (t1a); - providing a second free end (l2) of a second electrode web (f2) at the first free end (l1) of the first electrode web (f1), the second electrode web (f2) comprising a first surface portion (t2a) extending from the second free end (l2) and a second surface portion (t2b) extending from the second free end (l2) opposite the first surface portion (t2a); - applying a first connecting element (60b) at the first free end (l1) and the second free end (l2) by displacing a first applicator (60a) towards a first surface portion (t1a) of the first electrode web (f1) and a first surface portion (t2a) of the second electrode web (f2) and releasing the first connecting element (60b) from the first applicator (60a); - applying a second connecting element (70b) at the first free end (l1) and the second free end (l2) by displacing a second applicator (70a) towards a second surface portion (t1b) of the first electrode web (f1) and a second surface portion (t2b) of the second electrode web (f2) and releasing the second connecting element (70b) from the second applicator (70a).

2. The method according to claim 1, wherein: - applying the first connection element (60b) comprises pressing the first applicator (60a) against a first surface portion (t1a) of the first electrode web (f1) and a first surface portion (t2a) of the second electrode web (f2); - applying the second connecting element (70b) comprises pressing the second applicator (70a) against a second surface portion (t1b) of the first electrode web (f1) and a second surface portion (t2b) of the second electrode web (f2); as well as - Pressing the first applicator and pressing the second applicator include pressing the first applicator (60a) and the second applicator (70a) in opposite directions to each other, thereby maintaining the first free end (l1) and the second free end (l2) between the first applicator (60a) and the second applicator (70a).

3. The method according to claim 1 or 2, wherein: Applying the first connecting element (60b) and applying the second connecting element (70b) are performed simultaneously.

4. A method according to any one of the preceding claims, wherein Providing the first free end (l1) and providing the second free end (l2) comprises aligning the first electrode web (f1) and the second electrode web (f2) to a common placement plane (g) at the first free end (l1) and the second free end (l2), and wherein the first connecting element (60b) and the second connecting element (70b) are applied mirror-like relative to the placement plane (g).

5. A method according to any one of the preceding claims, wherein Applying the first connecting element (60b) comprises pressing the first applicator (60a) against a first surface portion (t1a) of the first electrode web (f1) and a first surface portion (t2a) of the second electrode web (f2), and applying the second connecting element (70b) comprises pressing the second applicator (70a) against a second surface portion (t1b) of the first electrode web (f1) and a second surface portion (t2b) of the second electrode web (f2).

6. The method according to claim 5, wherein: Pressing the first applicator (60a) and pressing the second applicator (70a) include pressing the first applicator (60a) and the second applicator (70a) in opposite directions to each other, thereby holding the first free end (l1) and the second free end (l2) between the first applicator (60a) and the second applicator (70a).

7. The method according to any one of the preceding claims, in, applying the first connecting element (60b) comprises holding the first connecting element (60b) to the first applicator (60a) as the first applicator (60a) is displaced towards the first surface portion (t1a) of the first electrode web (f1) and the first surface portion (t2a) of the second electrode web (f2), and wherein applying the second connecting element (70b) comprises holding the second connecting element (70b) to the second applicator (70a) as the second applicator (70a) is displaced toward the second surface portion (t1b) of the first electrode web (f1) and the second surface portion (t2b) of the second electrode web (f2).

8. A method according to any one of the preceding claims, wherein The first connecting element (60b) is an adhesion element, and wherein the second connecting element (70b) is an adhesion element.

9. A method according to any one of the preceding claims, wherein The first connection element (60b) comprises a first adhesive patch (69b), and wherein the second connection element (70b) comprises a second adhesive patch (79b).

10. The method according to claim 9, wherein: applying the first connecting element (60b) comprises punching a first sheet of adhesive web (b1a) to form the first adhesive patch (69b); and Applying the second connecting element (70b) comprises punching a second sheet of adhesive web (b2a) to form the second adhesive patch (79b).

11. The method according to claim 10, wherein: Punching the first sheet of adhesive web (b1a) includes moving a first punch (66) along a first punching direction (66a) toward the first sheet of adhesive web (b1a) and until the first punch (66) reaches the first free end (l1) and the second free end (l2); Punching the second sheet of adhesive web (b2a) includes moving a second punch (76) along a second punching direction (76a) toward the second sheet of adhesive web (b2a) and until the second punch (76) reaches the first free end (l1) and the second free end (l2).

12. The method according to claim 11, wherein: Moving the first punch (66) along the first punching direction (66a) toward the first sheet of adhesive web (b1a) and until the first punch (66) reaches the first free end (l1) and reaches the second free end (l2) is achieved by a single straight and uninterrupted translation of the first punch (66); and Moving the first punch (76) along the first punching direction (76a) toward the first sheet of adhesive web (b2a) and until the first punch (76) reaches the first free end (l1) and reaches the second free end (l2) is achieved by a single straight and uninterrupted translation of the first punch (76).

13. A method according to any one of the preceding claims, wherein Providing the first free end (l1) of the first electrode web (f1) comprises at least partially unwinding the first electrode web (f1) from a first electrode web roll (83), and wherein providing the second free end (l2) of the second electrode web (f2) comprises at least partially unwinding the second electrode web (f2) from a second electrode web roll (84).

14. The method according to claim 13, wherein: The at least partially unwound first electrode web (f1) comprises an unwound first sheet of electrode web (s1) defined by a first portion (s1a) and a second portion (s1b); and the at least partially unwound second electrode web (f2) comprises an unwound second sheet of electrode web (s2) defined by a first portion (s2a) and a second portion (s2b); Providing a first free end portion (11) of the first electrode web (f1) comprises cutting the first sheet of electrode web (s1) to separate the first portion (s1a) from the second portion (s1b) and defining the first free end portion (11) on the second portion (s1b); and Providing the second free end portion (12) of the second electrode web (f2) comprises cutting the second sheet of electrode web (s2) to separate the second portion (s2b) from the first portion (s2a) and defining the second free end portion (12) on the first portion (s2a).

15. The method according to claim 14, wherein: Cutting the unwound first electrode web (s1) comprises activating a blade (47) and a first counter blade (43) on the first electrode web (s1), Cutting the unwound first electrode web (s2) includes activating a blade (47) and a first counter blade (46) on the first electrode web (s2).

16. The method according to claim 15, wherein: Displacing the first applicator (60a) toward the first surface portion (t1a) of the first electrode web (f1) and the first surface portion (t2a) of the second electrode web (f2) comprises: switching a first rotating body (41) to a non-operating position, and in the non-operating position, inserting the first applicator (60a) through a passage opening (42) of the first rotating body (41); Activating the first counter blade (43) includes switching the first rotating body (41) to a cutting abutment position instead of the non-operating position, with the first counter blade (43) being placed on the first rotating body (41); Displacing the second applicator (70a) toward the second surface portion (t1b) of the first electrode web (f1) and the second surface portion (t2b) of the second electrode web (f2) comprises: switching a second rotating body (44) to a non-operating position and inserting the second applicator (70a) through a passage opening (45) of the second rotating body (44); Activating the second counter blade (46) includes switching the second rotating body (44) to a cutting abutment position instead of the inoperative position, on which the second counter blade (46) is placed.

17. A method according to any one of the preceding claims, wherein Providing a first free end (l1) of the first electrode web (f1) comprises: holding the first free end (l1) using a first holding device (21); and wherein providing a second free end (l2) of the second electrode web (f2) comprises holding the second free end using (l2) a second holding device (31).

18. An apparatus (1) for joining a first electrode web to a second electrode web for carrying out a change of electrode web rolls for producing an electrochemical cell, comprising: a first holding device (21) configured to hold a first free end (l1) of a first electrode web (f1) so as to hold the first free end (l1) in the bonding area (A), the first electrode web (f1) comprising a first surface portion (t1a) extending from the first free end (l1) and a second surface portion (t1b) extending from the first free end (l1) opposite the first surface portion (t1a); a second holding device (31) configured to hold a second free end (l2) of a second electrode web (f2) so as to hold the second free end (l2) in the bonding area (A) at the first free end (l1), the second electrode web (f2) comprising a first surface portion (t2a) extending from the second free end (l2) and a second surface portion (t2b) extending from the second free end (l2) opposite the first surface portion (t2a); a first applicator (60a) movable between a rest position outside the bonding area (A) and an application position in the bonding area (A), wherein the first applicator (60a) is configured to apply a first connecting element (60b) at the first free end (l1) and the second free end (l2), on a first surface portion (t1a) of the first electrode web (f1) and on a first surface portion (t2a) of the second electrode web (f2); - a second applicator (70a) movable between a rest position outside the bonding area (A) and an application position in the bonding area (A), wherein the second applicator (70a) is configured to apply a second connecting element (70b) at the first free end (l1) and the second free end (l2), on the second surface portion (t1b) of the first electrode web (f1) and on the second surface portion (t2b) of the second electrode web (f2).

19. The device (1) according to claim 18, wherein The first holding device (21) and the second holding device (31) are configured to align the first electrode web (f1) and the second electrode web (f2) along a common placement plane (g) at the first free end (l1) and the second free end (l2), and wherein the first applicator (60a) and the second applicator (70a) are configured to shift between respective rest positions and application positions in a mirror-like manner relative to the placement plane (g).

20. The device (1) according to claim 19, wherein The first applicator (60a) and the second applicator (70a) are configured to apply the first connecting element (60b) and apply the second connecting element (70b) simultaneously.

21. The device (1) according to any one of the preceding claims 18 to 20, wherein The first applicator (60a) is configured to press the first connecting element (60b) toward the second applicator (70a) in the corresponding application position, and wherein the second applicator (70a) is configured to press the second connecting element (70b) toward the first applicator (60a) in the corresponding application position, thereby maintaining the first free end (l1) and the second free end (l2) between the first applicator (60a) and the second applicator (70a).

22. The device (1) according to any one of the preceding claims 18 to 21, wherein The first applicator (60a) includes a first retaining surface (67), which is configured to retain the first connecting element (60b) when the first applicator (60a) is displaced toward a corresponding application position, and wherein the second applicator (70a) includes a second retaining surface (77), which is configured to retain the second connecting element (70b) when the second applicator (70a) is displaced toward a corresponding application position.

23. The device (1) according to claim 22, wherein The first holding surface (67) includes a suction surface (67) configured to hold a first adhesive patch (69b), the first adhesive patch having an adhesive surface facing the bonding area (A), and wherein the second holding surface (77) includes a suction surface (77) configured to hold a second adhesive patch (79b), the second adhesive patch having an adhesive surface facing the bonding area (A).

24. The device (1) according to any one of the preceding claims 18 to 23, wherein The first applicator (60a) includes a first punch (66), and wherein the second applicator (70a) includes a second punch (76).

25. The device (1) according to claim 24, wherein: The first connecting element (60b) comprises a first adhesive patch (69b), and wherein the second connecting element (70b) comprises a second adhesive patch (79b); and The first punch (66) is movable along a first punching direction (66a) toward the first sheet of adhesive web (b1a) and until the first punch (66) reaches the first free end (l1) and the second free end (l2) to punch the first sheet of adhesive web (b1a) to form the first adhesive patch (69b); The second punch (76) is movable along a second punching direction (76a) toward the second sheet of adhesive web (b2a) and until the second punch (76) reaches the first free end (l1) and the second free end (l2) to punch the second sheet of adhesive web (b2a) to form the second adhesive patch (79b).

26. The device (1) according to claim 25, wherein: The first punch (66) is actuatable by a single straight and uninterrupted translation to move the first punch (66) along the first punching direction (66a) toward the first sheet of adhesive web (b1a) and until the first punch (66) reaches the first free end (l1) and the second free end (l2); The second punch (76) is actuatable by a single straight and uninterrupted translation to move the second punch (76) along the second punching direction (76a) toward the second sheet of adhesive web (b2a) and until the second punch (76) reaches the first free end (l1) and the second free end (l2).

27. The device according to any one of the preceding claims 18 to 26, in: The first electrode web (f1) is at least partially unwound from a first electrode web roll (83), the first at least partially unwound electrode web (f1) comprising an unwound first sheet of electrode web (s1) defined by a first portion (s1a) and a second portion (s2b); the second electrode web (f2) being at least partially unwound from a second electrode web roll (84), the second at least partially unwound electrode web (f2) comprising a second piece of unwound electrode web (s2) defined by a first portion (s2a) and a second portion (s2b); The device (1) further comprises: - a blade (47); a first counter blade (43), the blade (47) and the first counter blade (43) being actuatable on the first electrode web (s1) to cut the unwound first electrode web (s1) between the first portion (s1a) and the second portion (s2b) to provide the first free end (l1) of the second portion (s2b) of the first electrode web (s1); - a second counter blade (46), said blade (47) and said second counter blade (46) being actuatable on said second electrode web (s2) to cut said unwound second electrode web (s2) between said first portion (s2a) and said second portion (s2b) to provide said second free end portion (l2) of said first portion (s2a) of said second electrode web (s2).

28. The apparatus according to claim 27, further comprising: a first rotating body (41) having a passage opening (42) and being switchable between an inoperative position and a cutting abutment position alternative to the inoperative position, in which the passage opening (42) of the first rotating body (41) can be traversed by the first applicator (60a) moving between the rest configuration and the application configuration, the first counter blade (43) being placed on the first rotating body (41) and being able to engage with the blade (47) when the first rotating body (41) is in the cutting abutment position, wherein the first rotating body (41) is switchable into the cutting abutment position to activate the first counter blade (43); - a second rotating body (44), the second rotating body having a channel opening (45), the channel opening being switchable between a non-operating position and a cutting abutment position replacing the non-operating position, in which the channel opening (45) of the second rotating body (44) is traversable by the second applicator (70a) moving between the rest configuration and the application configuration, the second reverse blade (46) being placed on the second rotating body (44), and the second reverse blade being engageable with the blade (47) when the second rotating body (44) is in the cutting abutment position, wherein the second rotating body (44) is switchable to the cutting abutment position to activate the second reverse blade.

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