Electrode manufacturing process with adjustment of rolling means and associated equipment

Abstract

The invention relates to a method for manufacturing electrodes for battery cells comprising: (ii) an inspection step of a previously obtained active material film (2) and / or a strip (3) to detect the possible presence of at least one defect; and (iii) a rolling step, using a rolling device (20), of the active material film (2) onto faces of the strip flowing between rolling elements (22) applying a predetermined compressive stress to form a laminated electrode strip (1). When a defect in the active material film or the strip is detected during the inspection step (ii), the method comprises: an adjustment step (iv) to reduce the predetermined compressive stress applied by the rolling elements and / or an adjustment step during which, during a preheating step (vi) of the strip prior to rolling, a preheating power reduction step (vii) is implemented. (Abbreviated figure: fig. 1)

Description

Title of the invention: Method for manufacturing electrodes with adjustment of rolling means and associated equipment Technical field of the invention

[0001] The invention relates, in general, to the technical field of battery cells.

[0002] The invention relates more specifically to a manufacturing process, in particular by dry process, of battery cell electrodes, and to associated equipment for manufacturing the electrodes. Prior art

[0003] Motor vehicles with electric or hybrid traction or propulsion include one or more battery modules connected to a power network to supply an electric motor (traction or propulsion).

[0004] The battery modules are grouped in a casing and together form a battery block, also often referred to by the English expression "battery pack", this casing generally containing a mounting interface and connection terminals.

[0005] Each battery module is an assembly comprising several electrochemical cells generating current by chemical reaction, for example of lithium-ion (or Li-ion), Ni-Mh, Ni-Cd or lead type.

[0006] An electrochemical cell comprises, in particular, a stack of positive electrodes connected to each other and a stack of negative electrodes connected to each other, separated by a separator, known as a "stack". The positive electrodes are connected to each other at a positive terminal, and the negative electrodes are connected to each other at a negative terminal.

[0007] To obtain the electrodes for the electrode stack, there are various electrode manufacturing processes. In particular, these processes can be divided into two categories: wet coating with solvents and so-called "dry" manufacturing, the latter being described in the remainder of this application. While the first option requires the preparation and use of a liquid ink that must subsequently undergo a solvent drying step, the second option eliminates this step and thus offers considerable advantages, particularly in terms of reducing manufacturing time, production costs, energy consumption, and the environmental impact of the process.

[0008] A "dry" manufacturing process for the electrodes of an electrode stack generally comprises: • a step of preparing a dry powder of active electrode material, the step consisting of mixing dry particles of active electrode material and dry particles of binder material; • a step of calendering the powder of an electrode active material using calendering means to obtain a film of calendered electrode active material; followed by • a lamination step using a lamination device to laminate at least part of the active electrode material film onto at least one side of a current collector strip, to form a laminated electrode strip. The laminated electrode strip is then cut to obtain a plurality of individual battery electrodes.

[0009] It is also known to implement an inspection step, before or after the rolling step, which allows for the detection of defects in the active electrode material film used in the rolling step. The defects detected during the inspection step may be, for example, manufacturing defects such as locally variable film thickness or quality defects, such as the presence of holes or foreign bodies such as fine particles in the active electrode material film.

[0010] However, even if a defect is detected upstream of the rolling stage, the manufacturing process continues and is subsequently followed by a selection stage in which the defective portions are selected and separated from the regular portions of the rolled electrode strip for recycling. Therefore, the entire rolled electrode strip produced is affected (active material and current collector strip).

[0011] To recycle the defective portion of the laminated electrode strip, it is necessary to use specific and complex separation processes to separate the laminated electrode active material film from the current-collecting strip. For example, some of these separation processes are related to the fields of hydrometallurgy or pyrometallurgy. Such processes are costly and do not guarantee the recycling of all the materials composing the defective portion of the laminated strip after the rolling operation. Consequently, recycling the defective portion of the laminated electrode strip is a costly operation that does not allow for the complete reuse of the materials used to manufacture the laminated strip.

[0012] Furthermore, it is common practice to add a coating to the faces of the current collector strip to facilitate and strengthen the adhesion of the active electrode material film to the current collector strip. In particular, the adhesion of the film to the current collector strip is improved by the preheating and of the rolling process. However, the addition of such steps tending to improve this adhesion further complicates the recycling of the laminated strip substantially because the separation of the active electrode material film from the current collector is made more difficult to implement.

[0013] Another component of recycling involves discarding the defective portion of the laminated strip. However, this practice not only results in considerable losses of the active electrode material, leading to economic losses, but also to a significant environmental impact. Description of the invention

[0014] The invention aims to remedy all or part of the disadvantages of the prior art by proposing in particular a method for manufacturing electrodes for battery cells, the method making it possible to reduce recycling costs, environmental impact and material loss related to the recycling of laminated strips configured to equip the electrodes.

[0015] To this end, according to a first aspect of the invention, a method for manufacturing electrodes for battery cells using equipment is proposed. This method is remarkable in that it comprises at least: • (i) a calendering step of a powder of an active electrode material to obtain a film of active electrode material; • (ii) a test step of the resulting electrode active material film and / or current collector foil (3) to detect the possible presence of at least one defect; and • (iii) a rolling step by a rolling device of a controlled portion of the electrode active material film on at least one face of a current collector strip flowing between rolling elements applying a predetermined compressive stress to form a laminated electrode strip; the manufacturing process comprising, prior to the rolling step, a step (vi) of preheating at least one side of the current collector strip, the preheating step (vi) being implemented by preheating means.

[0016] the manufacturing process being further notable in that, when a defect in the electrode active material film or the current collector foil is detected during the inspection step (ii), the process includes an adjustment step comprising: • a step (iv) of adjusting the rolling device configured to decrease the predetermined compressive stress by the rolling elements of the rolling device; and / or • a preheating adjustment step during which a step (vii) of reducing preheating power is implemented by the preheating means.

[0017] Such a process has the particular technical advantage of allowing the rolling step (iii) to be adjusted according to the quality of the active electrode material film obtained after calendering. If defects are detected during the inspection step (ii), adjusting the rolling and / or preheating step (iii) makes it possible to limit the losses of active electrode and current collector material since the rolled elements have been subjected to a compressive stress lower than the predetermined nominal compressive stress, i.e., in normal operation without detected defects, and / or less heating limiting the adhesion capacity, which makes them easily separable for recycling.Furthermore, this process allows for the production of a long laminated electrode strip containing defective sections that can be subsequently removed locally, thus avoiding the need to shut down the equipment every time a defect is detected. The process as described therefore saves production time and improves recycling efficiency, thereby reducing the manufacturing costs of the final product.

[0018] According to one embodiment, the adjustment step (iv) of the rolling device is configured to decrease, without eliminating, the predetermined compressive stress applied by the rolling elements of the rolling device when a defect in the active electrode material film is detected during the inspection step (ii). Current collector strips for dry welding are generally equipped with primer coatings to improve the adhesion and conductivity of the active layers, i.e., the active electrode material films, to the current collector strips. This adhesion must be achieved with minimal pressure and temperature applied to the primer layers (thermoplastic primer layers).In such a context, simply reducing the predetermined compressive stress below this minimum stress by the rolling elements of the rolling device when a defect in the electrode active material film and / or the current-collecting strip is detected may not be sufficient to facilitate the subsequent recycling of the defective portions of the resulting electrode strip, and therefore a reduction or even elimination of heating may be implemented. In this case, the current-collecting strip inspection includes the inspection of the associated primer coating.

[0019] In such a configuration, the predetermined compressive stress is reduced, preferably without being eliminated. In other words, the compressive stress is reduced from a nominal predetermined compressive stress value (i.e., in normal operating conditions) to a A predetermined lower stress, strictly less than the nominal predetermined compressive stress, is required. Indeed, if the laminating device no longer compresses the defective portion(s) of the active material film(s) against the current-collecting strip, the laminated electrode strip would exhibit disjointed sections, which could degrade the quality of the satisfactory sections adjacent to the defective ones. Furthermore, without compression, these disjointed sections would complicate rewinding and storage of the strip, potentially damaging the entire strip. Alternatively, the compressive stress can be reduced to the point of being eliminated.

[0020] According to one embodiment, the preheating adjustment step is configured to decrease, without eliminating, the preheating power supplied by the preheating means when a fault is detected during the inspection step (ii). This could be a fault detected on the electrode active material film and / or the current collector foil.

[0021] According to one embodiment, the step (iv) of adjusting the rolling device includes at least one step (v) of increasing the distance between the rolling elements so as to decrease the compression stress predetermined by the rolling elements of the rolling device.

[0022] The distance can be increased by moving one of the two rolling elements in a direction opposite to the other rolling element.

[0023] According to one embodiment, the rolling elements comprise at least one pair of rolling rollers, the step (v) of increasing the distance between the rolling elements comprising an operation (v') of moving at least one rolling roller of the pair of rolling rollers so as to space the rolling rollers by a target compression distance.

[0024] According to one embodiment, a step of adjusting the calendering means is implemented during the step (iv) of adjusting the rolling device.

[0025] Preferably in this case, the step (v) of increasing the distance between the rolling elements is accompanied by an operation (v”) of moving the calendering means associated with the rolling roller moved from the pair of rolling rollers and configured to be in contact with the same film of active electrode material.

[0026] The operation (v”) of moving the calendering means is preferably synchronized, or even more preferably implemented simultaneously, with the operation (v') of moving the rolling roller of the pair of rolling rollers.

[0027] Indeed, the objective is to reduce the compression exerted on the rolled elements. It may therefore be preferable to move all the associated rollers intended to be in contact with the same film of active electrode material at the same speed, on a same distance and in the same direction in a synchronized manner, and preferably simultaneously, in order to maintain the best possible calendering quality.

[0028] According to one embodiment, the step (iv) of adjusting the rolling device includes, prior to the displacement operation (v'), a step (ix) of determining a target reduced compression distance. In this way, the operation (v) of increasing the distance between the rolling elements is implemented by determining a target reduced compression distance to be achieved, and then at least one of the rolling rollers of the associated pair of rolling rollers is moved until it reaches a position in which the distance between the rolling elements has reached the target reduced compression distance.

[0029] According to one embodiment, the determination step depends preferably on one or more parameters, preferably chosen from the following parameters: a nature of the detected defect, a dimension of the detected defect, a bad weight of active material, the material of the active element of the electrode constituting the film of active material of the electrode, a presence or not of an additional coating on the current collector strip, the presence of contamination on the additional coating.

[0030] In this way, the compression exerted on the elements to be rolled is correlated with the presence or absence of defect(s) on at least one of the two films and / or on the current collector strip, and also with the type of defect, in order to optimize the size of the defective portions so as to minimize resource losses and reduce manufacturing costs.

[0031] According to one embodiment, the calendering step (i) is carried out using calendering means, for example calendering rollers.

[0032] According to one embodiment, the inspection step (ii) is carried out using inspection means, for example optical sensors, preferably optical cameras. Naturally, other inspection means can be used as alternatives or in addition. For example, the inspection means may also include means for checking the basis weight, preferably X-ray, Beta, Gamma, or Terahertz sensors. For example, the inspection means may also include means for checking the thickness, preferably Terahertz sensors or confocal sensors.

[0033] According to one embodiment, the rolling step (iii) is carried out using a pair of rolling rollers spaced at a predetermined distance.

[0034] According to one embodiment, the process includes, prior to the rolling step, a step (vi) of preheating at least one side of the current collector strip.

[0035] The preheating step therefore allows the current collector strip to be heated to a setpoint temperature, making it easier the adhesion of the active electrode material films to the latter (thermoplastic primer coating).

[0036] According to one embodiment, the preheating step (vi) is implemented by preheating means, the preheating means including, for example, infrared lamps, producing heat according to a supply power.

[0037] According to one embodiment, if at least one defect in the electrode active material film and / or the current collector strip is detected during the inspection step (ii), the manufacturing process includes a preheating adjustment step during which, during the preheating step (vi), a preheating power reduction step (vii) is implemented by the adjustment means, more specifically here the preheating means. Thanks to this feature, it is possible to reduce the heat emitted by the preheating means and thus reduce the preheating of the current collector strip, thereby reducing the adhesion between the current collector strip and the electrode active material film(s).

[0038] During step (vii) of reducing the preheating power by the preheating means, it is possible to variably reduce the power supplied to said preheating means so as to maintain a certain preheating power, strictly lower than the nominal preheating power. The preheating means can also be switched off, i.e., have a zero power supply when the fault-controlled portion passes through a preheating zone.

[0039] According to one embodiment, if at least one defect in the active electrode material film and / or the current collector strip is detected during the control step (ii), the preheating adjustment step includes, during the preheating step (vi), a step (viii) of increasing the distance between the preheating means and the current collector strip located in the preheating zone.

[0040] The preheating stage can therefore be controlled downwards by a variation in the intensity of the heat emitted by the preheating means and / or by moving the preheating means.

[0041] According to another aspect of the invention, it relates to equipment for manufacturing electrodes for battery cells. This equipment is notable in that it is configured for implementing a manufacturing process as described above.

[0042] The equipment includes at least: • calendering means configured to implement a step (i) of calendering a powder of an active electrode material to obtain a film of active electrode material; • control means to implement a step (ii) of checking the calendered electrode active material film or the current collector foil to detect the possible presence of at least one defect in the calendered electrode active material film or the current collector foil; and • rolling elements to implement a step (iii) of rolling a controlled portion of the electrode active material film onto one face of a current collector strip flowing between rolling elements applying a predetermined compressive stress to form a laminated electrode strip; • preheating means to implement, prior to the rolling step (iii), a preheating step (vi) of at least one side of the current collector strip; • adjustment means configured to implement, when a defect in the electrode active material film (2) or the current collector foil (3) is detected by the control means (28), at least one adjustment step comprising: • a step (iv) of adjusting the rolling device to reduce the predetermined compressive stress by the rolling elements of the rolling device when a defect in the electrode active material film and / or the current collector strip is detected by the control means; and / or • a preheating adjustment step to reduce the preheating power by the preheating means.

[0043] According to one embodiment, the pair of rolling rollers is located between the calendering means, which allows two films of active electrode elements to be conveyed simultaneously.

[0044] According to one embodiment, the equipment has a reference plane passing between the two rolling rollers of the pair of rolling rollers and parallel to the axes of rotation of these rolling rollers. The equipment is preferably symmetrical with respect to the reference plane. The equipment thus has similar calendering means on both sides of the rolling device for the two films, each being dedicated to calendering one of the two films of active electrode material. The equipment preferably comprises at least 4 rollers, i.e., 2 pairs of calendering rollers.

[0045] According to one embodiment, when the equipment is in a so-called normal or nominal operating mode, i.e. without fault detection during the control step (ii), the equipment includes a current collector strip conveying circuit along which the current collector strip is intended to be conveyed, the conveying circuit passing through a rolling zone, between the two rolling elements so that the current collector strip is locally coplanar with the reference plane in the rolling zone. Brief description of the figures

[0046] Other features and advantages of the invention will become apparent from the following description, with reference to the accompanying figures, which illustrate: • [Fig-1]: a diagram of the architecture of equipment for manufacturing electrodes for battery cells according to a first embodiment; • [Fig. 2]: a diagram illustrating a rolled electrode storage roll; and • [Fig. 3]: a diagram of the equipment architecture according to a second method of implementation.

[0047] For clarity, identical or similar elements are identified by identical reference signs throughout the figures.

[0048] In the description and claims, to clarify the description and claims, the terminology longitudinal, transverse, and vertical shall be adopted without limitation, with reference to the X, Y, Z trihedron shown in the figures. Detailed description of an embodiment

[0049] Figure 1 illustrates equipment 10 configured for the production of laminated electrode strips 1. More specifically, the laminated electrode strips 1 obtained are double-sided, meaning they have a film of active electrode material 2 on either side of a central current-collecting strip 3. In other words, a first film of active electrode material 2 is applied to one side of the current-collecting strip 3, and a second film of active electrode material 2 is applied to a second side of the current-collecting strip 3, opposite the first side. The distance between the first and second sides defines the thickness of the current-collecting strip 3. The manufacturing process is a so-called dry process, meaning without the use of solvents.

[0050] To obtain the laminated electrode strip 1, the equipment 10 includes a laminating device 20. The laminating device 20 is configured to laminate the two films of active electrode material 2 onto the current collector strip 3, each film of active electrode material 2 being laminated onto one of the distinct sides of the current collector foil 3.

[0051] The rolling device 20 comprises rolling elements, and more particularly two rolling rollers 22, including a first rolling roller 22A and a second rolling roller 22B. The two rolling rollers 22 are adjacent. More particularly, each rolling roller 22 has a main body 16. The main body 16 is cylindrical with a circular base. Each of the rolling rollers 22 extends along a transverse axis parallel to a transverse reference axis Y and extends between two ends along a central axis CIA, C1B of elongation of the main body 16 parallel to the transverse reference axis Y. Each of the rolling rollers 22 has a pivot joint whose axis coincides with the associated central axis CIA, C1B. In other words, the two rolling rollers 22 each have an axis of rotation parallel to the transverse reference axis Y.The two central axes CIA, C1B of the first and second rolling rollers 22A, 22B are coplanar in a horizontal plane PI. The main body 16 of each of the first and second rolling rollers 22A, 22B comprises a continuously smooth and homogeneous cylindrical outer surface 18, i.e., without holes.

[0052] The first and second rolling rollers 22A, 22B have axes of rotation parallel to the transverse axis Y and also have opposite directions of rotation, and preferably identical speeds. Rotation control means (not shown) allow the rotation of the first and second rolling rollers 22A, 22B to be controlled, which are synchronous. Furthermore, the first and second rolling rollers 22A, 22B are positioned at a distance from each other so as to form a gap of predetermined width: this predetermined space separates the first 22A and the second 22B rolling roller through which the two films of active electrode material 2 are rolled onto the current collector strip 3: with reference to the figures, the width of the gap is measured along an axis orthogonal to the transverse reference axis Y.Here, the central axes CIA, C1B of the first and second rolling rolls 22A, 22B being coplanar in a horizontal plane PI, the width of the gap is measured longitudinally. This gap is predetermined so as to apply a predetermined controlled compression to the electrode active material films 2 laminated onto the current collector strip 3. The gap between the first and second rolling rolls 22A, 22B defines a rolling zone 24 at which the current collector strip 3 and the electrode active material films 2 are laminated. This rolling zone 24 is centered at the minimum distance between the two adjacent rolling rolls 22 such that: . • upstream of this rolling zone 24, the current collector strip 3 and the electrode active material films 2 are separated two by two; • downstream of this rolling zone 24, the rolled electrode strip 1 is obtained.

[0053] Each film of active electrode material 2 is obtained by calendering, this calendering operation being carried out by calendering means 12. The calendering means 12 are configured to calender a powder 4 of the active electrode material intended to take the form of a film of active electrode material 2. In particular, the equipment 10 is configured to produce two films of active electrode material 2, each intended to be applied to a separate side of the current collector strip 3. The calendering means 12 include, in particular, a first pair 151 of calendering rollers 15 and a second pair 152 of calendering rollers 15 for manufacturing the two films of active electrode material 2. A given pair of calendering rollers 15 is associated with the manufacturing of only one of the two given films of active electrode material 2.The two calendering rollers 15 of a pair 151, 152 of calendering rollers 15 are adjacent and separated by a predetermined gap through which the powder 4 of the active electrode material is calendered. Naturally, the distance between the two calendering rollers 15 of the pair of rollers determines the thickness of the resulting film of active electrode material 2. This calendering step yields a film of active electrode material 2 whose thickness and density depend on the distance and the differential speed between the calendering rollers 15 of a pair 151, 152 of calendering rollers 15.

[0054] The active material powder 4 is poured by gravity into a discharge hopper to feed the calendering rollers. Preferably, the active material powder 4 comprises a mixture of electrode active material particles and binder material particles.

[0055] The discharge hopper is a fixed hopper which has a funnel shape and opens into an opening formed between the two calendering rollers 15 of the associated roller pair, the width of the opening corresponding to the distance between these two rollers 15. According to another embodiment of the invention, the discharge hopper can be an oscillating hopper, which makes it possible to guarantee a homogeneous distribution of the powder 4 of active material in the opening 103.

[0056] By passing through the opening, the powder 4 of active electrode material is compressed and sheared by the rotation in opposite directions and at different speeds of the calendering rollers 15 of the associated pair, which makes it possible to produce the film of active electrode material 2.

[0058] As mentioned, the calendering means 12 include, in particular, a first pair 151 and a second pair 152 of calendering rollers 15, each associated with the calendering of one of the two electrode active material films 2 and each composed of a first calendering roller 15A and a second calendering roller 15B. Each calendering roller 15, 15A, 15B has a main body 16 of cylindrical shape with a circular base. Each of the calendering rollers 15 extends along a transverse axis parallel to the transverse reference axis Y and extends between two ends around a central axis associated with the elongation of the main body 16, C2A, C2B, C3A, C3B, parallel to the transverse reference axis Y.

[0059] The two central axes of the calendering rollers 15 of the same pair 151, 152 are coplanar with a horizontal plane, preferably in the horizontal plane PI. In the embodiments illustrated in Figures 1 and 3, the calendering rollers 15 of the two pairs of calendering rollers are arranged so that their central axes are coplanar in the horizontal reference plane PI. The main body 16 of each calendering roller 15 comprises a continuously smooth and homogeneous cylindrical outer surface 18, i.e., without holes.

[0060] The equipment 10 also has a reference plane P2 parallel to a reference plane containing the transverse reference axis Y and a vertical reference axis Z orthogonal to the longitudinal reference axes X and transverse reference axes Y. The reference plane P2 therefore defines a vertical plane centered between the two rolling rollers 22. The reference plane P2 is orthogonal to the longitudinal plane PI so that, during the rolling operations by the rolling device 20, the current collector strip 3 follows a path or conveying circuit locally coplanar with the plane P2 in the rolling zone.

[0061] The calendering means 12 for a given electrode active material film 2 and one of the two associated rolling rollers are here globally symmetrical with the calendering means 12 for the other electrode active material film 2 and the other of the two associated rolling rollers. More specifically, the first pair 151 of calendering rollers 15 and the first rolling roller 22A are located on the same side of the datum plane P2, as illustrated in Figures 1 and 3. In particular, their axes of rotation are symmetrical with respect to the datum plane P2 with the axes of rotation of the second pair 152 of calendering rollers 15 and the second rolling roller 22B, which are located on the other side of the datum plane P2. More generally, the central axes of each of the calendering and rolling rollers are parallel to each other and coplanar with the horizontal datum plane PI.

[0062] The calendering means 12 of the two electrode active material films 2 and the laminating device 20 define all or part of a first path of Conveying path W2A and a second separate conveying path W2B for each of the two electrode 2 active material films. More specifically: • the first pair 151 of calendering rollers 15 and the first rolling roller 22A of the rolling device 20 are configured to drive the first film of electrode active material 2 of the two films of electrode active material 2 following the first conveying path W2A; and • the second pair 152 of calendering rollers 15 and the second rolling roller 22B of the rolling device 20 are configured to drive the second film of active electrode material 2 among the two films of active electrode material 2 following the second conveying path W2B.

[0063] Of course, additional rollers can be fitted to the equipment 10. For example, the embodiment of [Fig. 3] differs essentially from the embodiment of [Fig. 1] in that it includes additional calendering rollers, here two for each of the first and second conveyor paths W2A, W2B, located between the pair of calendering rollers and the rolling roller of the associated conveyor path W2A, W2B. In both embodiments, the axes of rotation of each of the rollers are parallel and contained in the horizontal reference plane PI.

[0064] Generally, a first group of rollers comprising at least the first pair 151 of calendering rollers 15 and the first rolling roller 22A of the rolling device 20 ensures the conveying of the first film of active electrode material 2 between the two films of active electrode material 2 along the first conveying path W2A. Similarly, a second group of rollers comprising at least the second pair 152 of calendering rollers 15 and the second rolling roller 22B of the rolling device 20 ensures the conveying of the second film of active electrode material 2 between the two films of active electrode material 2 along the second conveying path W2B.

[0065] The calendering rollers 15 of a given pair 151, 152 of calendering rollers have opposite directions of rotation. The calendering means further include control means (not shown) for controlling the rotational speed of the calendering rollers 15. The calendering rollers 15 of a given pair 151, 152 of calendering rollers rotate at differential speeds around their first and second axes of rotation, respectively.

[0066] Each of the rollers in a given group of rollers is arranged successively in adjacent pairs and has opposite directions of rotation. Each of the rollers in a given group of rollers is spaced from each other by a predetermined associated gap so as to participate in calendering, the associated conveyor path winding between each of the rollers driven into rotation in their respective directions of rotation. The active material film of electrode 2 then flows along the associated conveying path, successively passing through the given gaps, from calendering to rolling.

[0067] The first and second conveyor paths W2A, W2B are globally symmetrical with respect to the vertical reference plane P2.

[0068] Each of the paths between the first conveyor path W2A and the second conveyor path W2B converge towards the rolling zone 24. One of the two electrode active material films 2 is intended to be conveyed along the first conveyor path W2A while the other electrode active material film 2 is intended to be conveyed along the second conveyor path W2B. The first conveyor path W2A and the second conveyor path W2B meet at the rolling zone 24, between the two rolling rollers 22, and continue downstream of the rolling zone 24 coinciding with the conveyor circuit W1 of the current collector strip 3, forming a laminated electrode strip 1.

[0069] On intermediate portions of each of the first and second conveyor paths W2A, W2B, located downstream of the associated calendering means 12 and upstream of the rolling zone 24 relative to the associated conveyor path, control means 28 are arranged. The control means 28 are configured to implement a control step (ii) during which they acquire predetermined data from local portions of the electrode active material films 2 to be inspected 2A. In this way, it is possible to control the condition, and therefore the quality, of these portions to be inspected 2A of the electrode active material films 2. The defects detected during the control step may, for example, be: • manufacturing defects, for example, variable or uneven thickness on part of the film 2 or variable or uneven weight; and / or • quality defects, for example the presence of holes or foreign bodies, such as fine particles, in the active material film of electrode 2.

[0070] The control means 28 may include optical sensors (camera, laser, photodiode), ultrasonic sensors, ionizing sensors (X, Beta, Gamma), inductive or capacitive proximity sensors, infrared sensors (point, camera, etc.), voltage sensors, etc. The control means 28 are preferably oriented so as to be placed frontally with the active element films of electrode 2 at the level of the portions to be controlled 2A.

[0071] The equipment 10 also includes additional control means 30 configured to acquire predetermined data from the portions to be controlled IA of the rolled electrode strip 1 at the outlet of the rolling device 20, i.e., downstream of the rolling zone 24. These additional control means 30 are in In one embodiment, two sensors are positioned opposite the portion to be controlled IA of the laminated electrode strip 1. In a second embodiment, two sensors are arranged on each side of the laminated electrode strip 1.

[0072] The equipment 10 further comprises a storage roller 32 (illustrated in [Fig. 2]), disposed downstream of the rolling zone 24, and, for example, vertically below the rolling device 20. The storage roller 32 is configured to store the rolled electrode strip 1 by winding it around a storage shaft. The storage roller 32 has a cylindrical body. An outer surface 34 of the cylindrical body may be smooth or textured, for example, having suction ports so that, by applying a vacuum, a suction effect can be created to hold the rolled electrode strip 1 and wind it for storage.

[0073] The equipment 10 also includes preheating means 26. These preheating means 26 are configured to emit a predetermined amount of heat to preheat each side of a portion 3A of the current collector strip 3, upstream of the rolling zone 24, specifically before the gap between the two rolling rollers 15. The preheating is carried out in such a way as to facilitate the rolling of the active electrode material films 2 onto the current collector strip 3 and thus ensure better bonding of said active electrode material films 2 to the current collector strip 3.

[0074] The preheating means 26 here include infrared lamps oriented towards each of the two opposite faces of the current collector strip 3, at the level of the preheating zone, through which the portion to be preheated 3A flows towards the rolling zone 24. The preheating means 26 may also include, by way of non-limiting examples, gas burners or induction furnaces, UV sources, and more generally may be of different types, i.e. be powered electrically, by fuel or light energy. The preheating means 26 are arranged near a portion of a conveyor circuit W1 along which the current collector strip 3 is intended to pass. The conveyor circuit W1 runs between the preheating means 26 and then through the rolling device 20, between the two rolling rollers 15 and then continues its path towards a storage roller 32.

[0075] Control means 28 are also placed along the conveying circuit W1 of the current collector strip 3, located upstream of the rolling zone 24, more precisely upstream of the preheating means 26. The control means 28 are configured to implement a control step (ii) during which they acquire predetermined data from local portions of the collector strip. Current 3 to be checked. In this way it is possible to check the condition, and therefore the quality, of these sections of the current 3 collector strip to be checked.

[0076] It should be noted that the current collector strips 3 for dry circuits are generally equipped with primer coatings to improve the adhesion and conductivity of the active layers, i.e., the films of active electrode material, on the current collector strips. A control step of the current collector strip 3 to detect the possible presence of at least one defect naturally includes checking the coating of said current collector strip 3.

[0077] According to the invention, the equipment 10 includes adjustment means for implementing a step (iv) of adjusting the rolling device to decrease the compression stress predetermined by the rolling elements 22 of the rolling device 20 when a defect in the active material film of electrode 2 and / or on the current collector strip 3 is detected by the control means 28.

[0078] The adjustment means are also configured to decrease the preheating power by the preheating means 26. In other words, the adjustment means are configured to implement a preheating adjustment step during which, during a preheating step (vi), a preheating power reduction step (vii) is implemented by the preheating means 26 when a defect in the active material film of electrode 2 and / or on the current collector foil 3 is detected by the control means 28.

[0079] In this way, the films of active electrode material 2 are formed by the calendering means 12 and then conveyed to the rolling device 20. Each film of active electrode material 2 is controlled by a portion of the control means 28 arranged along the first or second associated conveyor path W2A, W2B. Concurrently, the current-collecting strip 3 is conveyed to the rolling device 20. The current-collecting strip 3 is controlled by another portion of the control means 28.If no defect is detected, the equipment 10 continues its operation with a rolling device 20 of the controlled portion(s) of the active electrode material film(s) 2 on one, and where applicable the other, face of the current collector strip 3 circulating between rolling rollers 22, 22A, 22B by applying a predetermined compressive stress and implementing a preheating of the current collector strip 3 to a predetermined temperature by the preheating means 26 to form a laminated electrode strip 1.

[0080] When a defect in the active material film of electrode 2 or the current collector strip 3 is detected by the control means 28, means for adjusting the rolling device and preheating means 26 are activated to reduce the predetermined compressive stress by the rolling elements 22 of the rolling device 20 and lower the temperature of the current collector strip 3, by reducing the heating or preheating power of the preheating means 26.

[0081] The equipment 10 also includes control means (not shown) configured to drive drive means (not shown) of the various calendering rollers 15, rolling rollers 22 and storage rollers 32. These drive means allow, in particular, for all or part of the calendering rollers 15, rolling rollers 22 and storage rollers 32 to be driven in rotation. The drive means include, for example, geared motors.

[0082] The equipment 10 includes a frame (not shown) configured to hold, in particular, the rolling device 20 and the calendering means 12 each in a determined position. The frame can be made of any suitable material(s), for example, metal or metals, composite(s), or other. The frame may comprise several separate and independent frame elements. The frame defines a structural support for the equipment 10, forming a frame that ensures the relative positioning of the various elements of the equipment 10 with respect to each other, including, in particular, the rolling device 20 and the calendering means 12.

[0083] Each of the calendering rollers 15, rolling rollers 22 and storage rollers 32 has an axle connected at each of its ends to a bearing, for example smooth or rolling, to form a pivot connection between the associated roller and the frame.

[0084] The said frame further comprises movable connecting elements and fixed connecting elements for attaching elements of the equipment 10 to the frame. The fixed connecting elements are intended to connect some of the elements of the equipment 10 to the frame without translational degrees of freedom. The movable connecting elements are intended to connect the other part of the elements of the equipment 10 to the frame such that these elements can be movable relative to the frame and relative to the fixed connecting elements with at least one translational degree of freedom, in particular along a translation parallel to the longitudinal reference axis X, or orthogonal to the transverse reference axis Y.

[0085] More specifically, the rolling rollers 22 are connected to the frame of the equipment 10 by a pivot joint so that they can be driven in rotation about their respective central axis C1A, C1B. More specifically, the first rolling roller 22A is connected to the moving connecting elements in translation and the second rolling roller 22B is connected to the fixed portion of the connecting element.

[0086] Furthermore, each calendering roller 15 is also linked to the frame of the equipment 10, freely rotating about its respective central axis C2A, C2B, C3A, C3B parallel to the transverse reference axis Y. In particular, the The first pair 151 of calendering rollers 15 is linked to the movable connecting elements as well as the second pair 152 of calendering rollers 15 which is linked to the movable connecting portion of the reinforcement.

[0087] Preferably, to improve the structural integrity of the reinforcement while minimizing the amount of material and the weight of the equipment 10, all or part of the cross members composing the reinforcement have a tubular, i.e., hollow, structure. The preheating means 26 are attached to the reinforcement of the equipment 10, and preferably arranged vertically above the rolling device 20. The control means 28 are integral with the reinforcement and are preferably oriented so as to be positioned opposite the active electrode element films 2 at the level of the portions to be inspected 2A and opposite the current collector strip 3 at the level of the portion to be inspected, upstream of the preheating means 26. The additional control means 30 are integral with the reinforcement and are preferably oriented so as to be positioned frontally with the portion to be inspected IA of the rolled electrode strip 1.

[0088] In other words, each of the rollers in the first group of rollers (151, 22A) is linked to the armature by movable connecting elements that translate along an axis of displacement, here parallel to the longitudinal reference axis, so that they can move together in a coordinated manner away from the second rolling roller 22B, thereby increasing the distance between them and relieving the associated rolling stress. Even though the rollers of the second pair 152 of calendering rollers 15 are linked to the movable connecting portion of the armature, their respective mobility is not controlled here by adjustment means based on the detection or not of a possible defect, but rather they have a degree of mobility that modifies the gaps or distances between the rollers to allow adjustment of the calendering, which affects the thickness and density of the associated active electrode element film 2.Thus, the adjustment means can control the movement of the rollers of the first group of rollers (151, 22A) relative to the frame to release the lamination pressure when the rollers of the second group of rollers (152, 22B) are held fixed relative to the frame. It is understood that the rollers can be movable relative to each other, in order to vary the overall clearances between them.

[0089] In operation, the equipment 10 first performs a calendering step (i) by means of the calendering means 12. The calendering step (i) consists of forming the two films of electrode active material 2 by passing the electrode active material powder 4 between the first and second calendering rollers 15 of the first 151 and second pair 152 of calendering rollers 15. Each of the two films of electrode active material 2 passes along one of the two associated conveyor paths W2A, W2B where it is controlled during a control step (ii) implemented by the control means 28 on a controlled portion of the active electrode material film 2. The current collector strip 3 also passes along an associated conveyor path W1 where it is controlled during the control step (ii) implemented by the control means 28 on a controlled portion of the current collector strip 3.

[0090] If the inspection means 28 determine that the quality of the two electrode active material films 2 and that of the current collector strip 3 is satisfactory, i.e., that they do not have any detected defects, each inspected portion of the electrode active material film 2 and the current collector strip 3 continues to be conveyed along the associated conveyor path W2A, W2B, W1 towards the rolling zone 24. Concurrently, the current collector strip 3 is preheated in a preheating step (vi) implemented by the preheating means 26 upstream of the rolling step and downstream of the inspection step (ii). A preheated portion 3B of the current collector strip 3 is then conveyed to the rolling zone 24.The preheated portion 3B of the current collector strip 3 and the two controlled portions 2A of the active electrode material film 2 reach the rolling zone 24, in which these three components are rolled during a rolling step (iii) where each of the two controlled portions of the active electrode material film 2 is rolled separately onto each of the two faces of the current collector strip 3. Thus, the controlled portions of the active electrode material films 2 and the current collector strip 3 circulate between rolling elements 22, i.e. between the rolling rollers 22 which apply a predetermined compressive stress to form the rolled electrode strip 1. The rolled electrode strip 1 resulting from this rolling step (iii) is then conveyed to the storage roller 32 around which it is wound.In the next stage of the electrode manufacturing process, cutting steps are implemented on the laminated electrode strip 1 to form the electrodes.

[0091] If a defect is detected during the inspection step (ii) on one of the electrode active material films 2, i.e., if the inspection means 28 determine that at least one of the two electrode active material films 2 or the current collector strip 3 has a defect, the adjustment means of the equipment 10 perform an adjustment step (iv) of the rolling device 20 consisting of reducing the predetermined compressive stress applied by the rolling rollers 22 of the rolling device 20 to the preheated portion 3B of the current collector strip 3 and the two inspected portions of the electrode active material film 2. Concurrently, the adjustment means of the equipment 10 perform a step of Preheating adjustment during which a step (vii) of reducing preheating power is implemented by the preheating means. This achieves a reduction in temperature on the current collector strip 3 by reducing the power of the preheating means 26.

[0092] In particular, step (iv) of adjusting the rolling device 20 includes a step (v) of increasing the distance between the rolling elements 22. Step (v) of increasing the distance between the rolling elements 22, in particular between the first rolling roll 22A and the second rolling roll 22B, is achieved by moving the axis of the associated roll in translation. In a complementary or alternative embodiment not shown, each of the two axes of the first and second rolling rolls 22A, 22B can be moved in translation according to the configuration.

[0093] In this embodiment, only the first rolling roller 22A of the two rolling rollers 22A, 22B is connected to the reinforcement by linking elements that move in translation along a displacement axis. Thus, the translational displacement of the first rolling roller 22A relative to the second rolling roller 22B allows them to be moved apart in a direction parallel to the longitudinal reference axis X, i.e., in the plane PI. In particular, here, all the rollers attached to the movable linking elements of the reinforcement are moved away from the other rollers.These are the rollers of the first group of rollers comprising the first pair 151 of calendering rollers 15 and the first rolling roller 22A of the rolling device 20 which are thus moved in translation relative to the rollers of the second group of rollers comprising at least the second pair 152 of calendering rollers 15 and the second rolling roller 22B of the rolling device 20.

[0094] In the embodiments as illustrated, each of the rollers in the first group of rollers is moved simultaneously in a direction away from the rollers in the second group of rollers. Thus, the other movable rollers are not moved when the equipment 10 switches from "nominal" mode to "fault detection" mode. In particular, a step for adjusting the calendering means 12 is implemented by the adjustment means during step (iv) of adjusting the rolling device 20. Thus, since each of the rollers is spaced two by two by predetermined gaps, translating all the rollers in the first group of rollers along the same path, in particular a translation in the same direction, makes it possible to keep the gaps constant despite their movement in order to limit, for a predetermined period, the decrease in the predetermined compressive stress caused by the rolling rollers.

[0095] Indeed, the step (v) of increasing the distance between the rolling elements 22 is accompanied by an operation (v”) of moving the calendering means 12 associated with the rolling roller moved from the pair of rolling rollers 22A, 22B and configured to be in contact with the same film of active electrode material 2, the operation (v”) of moving the calendering means 12 being synchronized and simultaneous with the operation (v') of moving the rolling roller 22A from the pair of rolling rollers 22A, 22B.

[0096] Thus, the relative distance separating the two rolling rollers 22 is increased compared to the predetermined distance in the nominal operation of the equipment 10, thereby decreasing the compression exerted on the elements to be rolled 2, 3, without eliminating it, so as to reduce the adhesion of the elements to be rolled 2, 3 to each other. This reduced adhesion effect is achieved in addition to a reduction in the temperature of the current collector strip 3 by reducing the power of the preheating means 26. A defective portion 36 of the rolled electrode strip 1 results from this rolling step (iii), which is conveyed to the stockpile roller 32 continuously along with the undefective portions of the rolled electrode strip 1.

[0097] This defective portion 36 of laminated electrode strip 1 is easy to recycle, its components being weakly bonded and therefore more easily separable.

[0098] In the subsequent process, the strip 1 is cut at regular intervals to form electrodes. The electrodes resulting from this cutting step, and containing a portion of the defective section 36 of the laminated electrode strip 1, therefore contain at least one defect and have been laminated under reduced compressive stresses or even reduced adhesion. These defective electrodes are then dismantled to ensure their recycling. Their disassembly is facilitated by the low adhesion or lack of adhesion between the different elements laminated under low compression and / or low temperature. The selection step, in which the defective sections are selected and separated from the regular sections of the laminated electrode strip for recycling, is therefore carried out after the electrode cutting step.

[0099] In a particular configuration, the equipment 10 includes a marking system configured to identify defective areas, i.e., areas with at least one defect. This marking can be carried out according to different categories, for example, by differentiating between thickness variations, load variations, and defects. This is advantageous because the layer (film 2 or strip 3) that is the source of the defect must be disposed of at the end, or even not recycled, or must be recycled using a different method. For example, in the case of contamination, it must be ensured that the contaminated material is disposed of and not recycled. Such marking systems may include, for example, applied markings such as labels, writing, or engravings.

[0100] Step (iv) of adjusting the rolling device 20 is controlled by control means depending on predetermined data from the control means 28 and may depend on several criteria, such as: • the presence or absence of a pre-bonded adhesive coating on one or two face(s) of the current collector strip 3, upstream of the preheating step (vi) in order to improve adhesion during lamination between the active material films of electrode 2 and the current collector strip 3 at the level of the lamination zone 24; • the longitudinal extent, in the direction of conveying the active material film of electrode 2, of the defects detected on the defective controlled film; • the nature of the defect (presence of a foreign body, hole, crack, irregular thickness, too thin or too thick, etc.); • etc.

[0101] According to predetermined criteria, and prior to step (v) of increasing the distance between the rolling elements 22, i.e. between the rolling rollers 22, step (iv) of adjusting the rolling device 20 includes a step (ix) of defining a target reduced compression distance so as to define a target reduced compression distance between said rolling elements 22, this target reduced compression distance being calculated so as to link the elements 2, 3 by rolling with a predetermined compressive stress corresponding to a distance between the two increased rolling rollers, facilitating a posteriori the dismantling of the defective portion 36 of the associated rolled electrode strip 1.During the adjustment of the rolling device, the translational displacement of the corresponding rollers, including at least the first rolling roller 22A, is moved until the distance separating the two rolling rollers 22A, 22B has reached this previously calculated target reduced compression distance value.

[0102] As described, the adjustment means of the equipment 10 are controlled by the control means of the equipment 10 according to the data from the control means 28. A time delay can be implemented between the control step (ii) when a defect of the active material film of electrode 2 or of the current collector strip 3 is detected and the adjustment step (iv) of the rolling device, this time delay depending in particular on the distance along the associated conveyor path, between the control means 28 and the conveying speed of the active material films of electrode 2 and the current collector strip 3 along the corresponding conveyor circuit.

[0103] According to one embodiment, the preheating means 26 are controlled by the equipment adjustment means 10 according to the control means 28, in parallel with step (iv) of adjusting the rolling device 20. If a fault in one of the If active material film on electrode 2 or current collector strip 3 is detected during the control step (ii), the preheating means 26 are controlled to implement a preheating power reduction step (vii) to decrease the preheating heat on one face of the strip, thereby reducing the adhesion of the two controlled portions of the active material film on electrode 2 to the strip during the rolling step (iii), i.e., during the rolling process. This heat reduction can be regulated to be partial or total; in other words, the preheating means 26 can be controlled to heat less or not at all. This is achieved by reducing the power supply to the preheating means 26 or switching them off.Furthermore, the preheating means 26 can also be moved further away from the preheated portion 3A of the current-collecting strip 3 by a step (viii) of increasing the distance between the preheating means 26 and the current-collecting strip. Consequently, the preheated portion 3A of the current-collecting strip 3 is less heated or not heated at all, which reduces the adhesion of the two controlled portions of the active electrode material film 2 to the strip. The laminated electrode strip 1 then has more easily separable elements, simplifying the recycling of associated electrodes containing at least one defect.

[0104] The defective portions of electrode active material film 2 and current collector strip 3 to be recycled are sorted subsequently during a sorting step during the cutting or notching process implemented after rolling to form the electrodes from the laminated electrode strip 1, and thanks to the marking implemented by the marking system.

[0105] Various strategies are possible for easily sorting non-layered materials, for example separation processes such as eddy current separators (aluminium and copper for example are repelled by magnetic fields).

[0106] According to another embodiment illustrated in [Fig.3], the calendering means 12 comprise 4 pairs of calendering rollers 15. Preferably, the calendering means 12 comprise an even number of calendering rollers 15 associated with each active electrode material film 2.

[0107] The equipment 10 may also include means for adjusting the tension of the current collector strip 3 and / or the laminated electrode strip 1. These tension adjustment means may be controlled by the control means of the equipment 10. The adjustment means may take into account various external parameters such as data from a voltage measuring device (not shown) configured to measure the tension of the current collector strip 3 and / or the laminated electrode strip 1.

[0108] Thanks to such an invention, it is possible to laminate the dry active layers (electrode active material films 2) if and only if there is no quality deviation (thickness, charge, defects, etc.), and to recycle the active layers 2 and the current collector strips 3 separately if there is a quality deviation.

[0109] The invention thus makes it possible to reduce the losses of active and inactive materials (NMC811, LMFP, graphites, PTFE, aluminum, copper, etc.) and to improve the cost of electrodes.

[0110] Naturally, the invention is described above by way of example. It is understood that a person skilled in the art is able to carry out different embodiments of the invention without departing from the scope of the invention.

[0111] For example, according to an embodiment not shown, the armature may comprise separate groups of movable linking elements, each associated with one of the two roller groups. Thus, if a defect on at least one of the active material films of electrode 2 is detected during the inspection step (ii), the two separate groups of movable linking elements may move away from each other.

[0112] According to another embodiment not illustrated, the equipment can implement a rolling step by a rolling device 20 of a single film of active electrode material 2 on only one face of the current collector strip 3 flowing between rolling elements 22.

[0113] It is emphasized that all features, as they are apparent to a person skilled in the art from the present description, drawings and attached claims, even if in practice they have only been described in relation to other specific features, both individually and in any combinations, can be combined with other features or groups of features disclosed herein, provided that this has not been expressly excluded or that technical circumstances render such combinations impossible or meaningless.

Claims

Demands

1. A method for manufacturing electrodes for battery cells by means of equipment (10), the method being characterized in that it comprises at least: - (i) a step of calendering a powder (4) of an active electrode material to obtain a film of active electrode material (2); - (ii) a step of inspecting the film of active electrode material (2) obtained and / or of a current collector strip (3) to detect the possible presence of at least one defect; and - (iii) a step of rolling by a rolling device (20) a controlled portion of the film of active electrode material (2) onto at least one face of the current collector strip (3) flowing between rolling elements (22) applying a predetermined compressive stress to form a laminated electrode strip (1);the manufacturing process comprising, prior to the rolling step, a preheating step (vi) of at least one side of the current collector strip (3), the preheating step (vi) being implemented by preheating means (26), the manufacturing process being further characterized in that, when a defect in the active electrode material film (2) or the current collector strip (3) is detected during the inspection step (ii), the process includes an adjustment step comprising: - an adjustment step (iv) of the rolling device configured to decrease the predetermined compressive stress by the rolling elements (22) of the rolling device (20); and / or - an adjustment step of the preheating during which a preheating power reduction step (vii) is implemented by the preheating means (26).

2. A manufacturing method according to claim 1, characterized in that step (iv) of adjusting the rolling device is configured to decrease without eliminating the predetermined compressive stress by the rolling elements (22) of the rolling device (20) when a defect is detected during the control step (ii).

3. A manufacturing method according to claim 1 or 2, characterized in that the preheating adjustment step is configured to decrease without eliminating the preheating power by the preheating means (26) when a fault is detected during the control step (ii).

4. A manufacturing method according to any one of the preceding claims, characterized in that the step (iv) of setting the rolling device includes at least one step (v) of increasing the distance between the rolling elements (22) so as to decrease the predetermined compressive stress by the rolling elements (22) of the rolling device (20).

5. A manufacturing method according to the preceding claim, characterized in that the rolling elements (22) comprise at least one pair of rolling rollers (22A, 22B), the step (v) of increasing the distance between the rolling elements (22) comprising an operation (v') of moving at least one rolling roller of the pair of rolling rollers (22A, 22B) so as to space the rolling rollers (22A, 22B) by a target compression distance.

6. A manufacturing method according to the preceding claim, characterized in that a step of setting the calendering means (12) is carried out during the step (iv) of setting the rolling device, preferably the step (v) of increasing the distance between the rolling elements (22) is accompanied by an operation (v”) of moving the calendering means (12) associated with the rolling roller moved from the pair of rolling rollers (22A, 22B) and configured to be in contact with the same film of active electrode material (2), the operation (v”) of moving the calendering means being preferably synchronized, preferably again carried out simultaneously, with the operation (v') of moving the rolling roller from the pair of rolling rollers (22A, 22B).

7. A manufacturing method according to any one of claims 4 to 6, characterized in that the step (iv) of setting the rolling device includes, prior to the operation (v') of displacement, a step (ix) of determining the target compression distance.

8. A manufacturing method according to any one of the preceding claims, characterized in that if at least one defect in the electrode active material film (2) or the current collector strip (3) is detected during the control step (ii), the preheating adjustment step includes, during the preheating step (vi), a step (viii) of moving the preheating means (26) away from the current collector strip (3).

9. Equipment (10) for manufacturing electrodes for battery cells characterized in that it is configured to carry out a manufacturing process according to any one of the preceding claims, the equipment (10) comprising at least: - calendering means (12) configured to carry out a step (i) of calendering a powder (4) of an active electrode material to obtain a film of active electrode material (2); - inspection means (28), to carry out a step (ii) of inspecting the calendered film of active electrode material (2) or the current collector strip (3) to detect the possible presence of at least one defect in the calendered film of active electrode material (2) or the current collector strip (3);and - rolling elements (22) for implementing a step (iii) of rolling a controlled portion of the electrode active material film (2) onto one face of a current collector strip (3) flowing between rolling elements (22) applying a predetermined compressive stress to form a laminated electrode strip (1); - preheating means (26) for implementing, prior to the rolling step (iii), a step (vi) of preheating at least one side of the current collector strip (3); - adjustment means configured to implement, when a defect in the electrode active material film (2) or the current collector strip (3) is detected by the control means (28), at least one adjustment step comprising:; a step (iv) of adjusting the rolling device to reduce the compression stress predetermined by the rolling elements (22) of the rolling device (20); and / or a step of adjusting the preheating to reduce the preheating power by the preheating means (26).