Device and method for superposing separator strips and foils, preferably for electrochemical cells intended to produce batteries

Abstract

A stacking apparatus and method for stacking a separator strip (NS) and a foil (201, 301), the stacking apparatus comprising a feeding unit (20) arranged immediately upstream of a stacking unit (1) and configured to feed the separator strip (NS) along a feeding path (PA); the apparatus (100) comprises a stacking unit (1) comprising a stacking surface (10) configured to receive the separation strip (NS) and the foil (201, 301) to form a stacked structure (S) of the separation strip (NS), the apparatus comprising a manipulation unit (130) configured to manipulate the stacking surface (10) of the separation strip (NS) and the foil (201, 301) to form the stacked structure (S) of the separation strip (NS). The handling unit is configured to move the stacking surface (10) in a continuous movement relative to the feeding unit (20) along a second working path (P2) defining a closed curve.

Description

[0001] The present invention relates to an apparatus for stacking separator strips and foils, for example, a type formed by stacking separator strips in an alternating manner with foils.

[0002] The present invention also relates to a method for stacking separator strips and foil sheets.

[0003] The present invention is preferably, but not exclusively, applied in the field of production of electrochemical units, such as those intended for the production of pouch cells or prismatic cells; in manufacturing these types of cells, a stacked structure of separators is used, preferably a stacked structure of separators alternating with foils.

[0004] In particular, in the relevant technical field, it is known to combine different stacked layers of self-folding separators with electrode foils placed between the different layers to form a structure suitable for manufacturing electrochemical cells intended to produce batteries.

[0005] Examples of apparatus and methods for manufacturing batteries by stacking separators in an alternating manner with foils are provided: using a servo motor and a reducer to move the stacked units by a controlled oscillating motion.

[0006] In this specification and the appended claims, unless otherwise expressly stated, certain terms and expressions shall be deemed to have the meanings expressed by the following definitions.

[0007] The term "separator strip" refers to any solid product presented in the form of a long strip or band within an industrial production line, i.e., an element whose longitudinal extension is significantly greater than its transverse extension. The separator strip can be formed from a single strip or band of material, or it can be formed from multiple overlapping strips to create a multi-layered product.

[0008] The separator also has the characteristic of allowing a certain degree of bending as it moves along the relevant production line.

[0009] For example, the separator can be used by overlapping alternating insulating layers to form a stacked structure or sandwich for manufacturing electrochemical units.

[0010] In addition, the term "separator strip" refers to a strip product with the following characteristics: allowing separation and / or isolation from other components located in its vicinity.

[0011] This separation can be achieved through physical or chemical properties, depending on the expected usage conditions.

[0012] An example of this separation property can be demonstrated by an electrically insulating polymer strip positioned in contact with the foil of the conductor electrode.

[0013] The specific configuration described above is merely an example and not a limitation.

[0014] Other embodiments may include polymer strips that have a certain degree of flexibility, allowing the strip to stack itself.

[0015] According to some examples, these materials can be polyolefins, such as polyethylene, polypropylene, or copolymers derived from them.

[0016] In this context, the term "overlay" refers to an action adapted to form a structure comprising multiple layers including self-folding dividing strips, to create a continuous structure suitable for separating or isolating other components between different horizontal pieces made of dividing material.

[0017] The term "overlapping structure" refers to any structure formed by stacking, i.e., folding, a strip, or more broadly, a strip article, thereby creating different overlapping layers according to the projection or overlap of the strip, preferably a vertical projection or overlap. It can be seen that such an overlapping or folding structure aims to achieve at least partial separation of the potential product between the layers and does not necessarily require direct contact between the different layers of the strip used.

[0018] Typically, this stacked structure is identified as a "Z-shaped structure" based on the folded shape formed by the different layers.

[0019] As mentioned above, this stacked structure can be applied not only to the field of electrochemical units, but also to other fields, such as the field of conductors or capacitors within which the stacked structure can also be used.

[0020] The term "work path" refers to a closed path traveled by a control device or similar moving element, wherein the start and end points of the path are substantially the same.

[0021] The term "continuous" in relation to motion refers to an operation that is performed without interruption, i.e., without any stop or interruption. In particular, where it preferably, but not exclusively, relates to the feeding or movement of a belt, the term "continuous" means that the belt never stops during the feeding or movement of the belt.

[0022] Similarly, the term "continuous" can also be used for products, such as separators, that is, products that are uninterrupted or clearly separated within the product and thus present themselves as a single entity during the processing steps or use.

[0023] Furthermore, as mentioned above, it should be considered that the strips used in the different elucidable steps of the industrial process of concern are preferably continuous separator strips; therefore, the technical solution requires the step of folding the continuous separator strip itself to form at least two overlapping layers of the above-mentioned stacked structure, thereby highlighting at least one process difference compared to the following technology: namely, the technology of sequentially stacking a single or multiple separator layers that are pre-formed or pre-cut (i.e., the concept of simply releasing the pre-structured architecture and being identifiable using the narrowest meaning of the term "stacked").

[0024] The term “substantially constant” refers to a measured value or quantity, such as the angle of displacement of an object during its trajectory, i.e. the angle formed by the object during its displacement, meaning that the measured value or quantity maintains the following value over time: preferably a maximum value of ±10%, more preferably a maximum value of ±5%, and even more preferably a maximum value of ±2%.

[0025] The term "direction" refers to an identifiable vector having a direction and orientation as described or illustrated in the specification and any accompanying drawings. In other words, in this context, when the term "direction" is used, it refers to the direction of a direction. In some discussions, the components of a free vector are described as its direction, orientation, and norm or modulus (or less strictly, scalar modulus) to describe the components of the free vector in a more precise and detailed manner. More specifically, in this context, "norm" refers to the Euclidean distance between the two corresponding starting and ending points of a distance vector, i.e., the square root of the sum of the squares of its components.

[0026] The term "basically equal to 0 mm" refers to the minimum deviation from the precise 0 mm that may occur only due to the dimensional constraints of the relevant motion mechanism, and this deviation is typically a few millimeters.

[0027] The terms “upstream” or “downstream” refer to objects or process steps that occur before or after a specific sequence of flow. When these terms refer to the “direction of spreader roll”, they indicate whether the spreader roll occurs before or after a step relative to the path the spreader roll travels in the forward direction of the spreader roll—from the initial release or distribution element (roller, reel, etc.) to the stacking surface on which the spreader roll is placed.

[0028] In this context, "to unfold" is a synonym for "is unfolding".

[0029] Furthermore, in the examples and discussions given, when the implementation involves the application of an electrochemical unit, the term "foil" may be replaced by "electrode".

[0030] The term "while following according to at least one component" used to refer to B following A means that the shift of A is consistent with the shift of B, that is, the shift vector of B and the shift vector of A have equal components.

[0031] In this context, the term "maintaining the same angular orientation in all possible spatial configurations" means that a particular arrangement of a device or object uniquely associated with a set of vectors oriented in a particular manner in space does not alter that orientation of the set of vectors, regardless of the spatial configuration employed. In other words, when this state occurs, a displacement operator applied to the set of vectors will only produce permissible translations and not rotations.

[0032] The term "Y is immediately downstream of X" means that device or product Y is identified sequentially as being immediately after X, and there are no other intermediate devices or products between X and Y.

[0033] The term "selective extension" refers to changing the length of an object's extension or the length of a portion of it, thereby achieving an increase that is not subject to pre-set geometric constraints or limitations.

[0034] The term "the second path crosses the reference plane" means that the second path intersects the reference plane. In other words, the reference plane divides the second path into two parts. Similarly, the reference plane divides space into two opposing half-spaces, and the two parts of the second path are included in one of the half-spaces.

[0035] The term "complete displacement" refers to reaching the final or preset position.

[0036] The term "while the stacked structure (S) is being formed" refers to the action or process state that occurs during any step in all steps that form the stacked structure.

[0037] The term "consistent" when referring to the movement of two or more elements means that these elements perform substantially the same movement, and perform substantially the same movement substantially simultaneously. The term should be understood as a synonym for "integral," but its meaning is broader in relation to the structural constraints involved.

[0038] In other words, two elements, displaced by consistent motion, perform integrated motion as a single entity. However, one of these elements is not necessarily directly connected to or constrained to the other and may be associated with different units and components of the equipment. In practice, it can be configured that the corresponding manipulation systems of the two elements are constructed, programmed, or operated to enable the two elements to move together in a cooperative manner when necessary. Furthermore, for example, temporary constraints, i.e., physical or digital constraints, can be used between the two elements. These temporary constraints can connect and coordinate the two elements to each other at some process steps, thereby enabling them to move together, and then separate the two elements again, allowing them to move independently.

[0039] The term "the absolute value of the deviation angle β is greater than 60°" refers to angles with a value greater than +60° and angles with a value less than -60°.

[0040] In particular, in this specific context, the deviation angle β can be regarded as a rotation angle based on a first (positive) direction or a second (negative) direction opposite to the first direction.

[0041] Since the orientation of the separator band changes frequently at certain stages of the process in the preferred embodiment described below, this deviation angle obviously helps to clearly show the state of the band rotating in one direction or the opposite direction.

[0042] Clearly, the same explanations made for the 60° statement also apply to other angle values ​​(i.e., 70°, 80°) that use the same expression.

[0043] It should also be noted that the expression "to move the object between the first position and the second position" refers to both moving the object from the first position to the second position and moving it from the second position to the first position.

[0044] This definition applies in a similar way to similar expressions of motion, such as transferring or moving a general object between two locations, between two regions, or even between two different working configurations.

[0045] In response to the applicant's ongoing need to improve the performance and efficiency of its manufacturing processes, it has preliminarily identified the following situation: in production lines used to form stacked structures suitable for forming electrochemical cells intended for battery production, the advancing speed of the separators relative to the cells performing the stacking of the separators may become a significant factor limiting the production line's own capacity.

[0046] Furthermore, this limitation becomes even more critical when high precision is required in forming stacked structures.

[0047] In particular, the applicant has found that in many applications, such as in the production of electrochemical units, it is essential to ensure high precision in the geometry of the stacked components and in the positioning of the electrode foils between one stack layer and another to ensure the required performance of the finished product.

[0048] This requirement will reduce the overall speed of the production line because the advance of the belt used to form the stacked structure must be interrupted to ensure the necessary manufacturing accuracy.

[0049] However, the applicant has found that the solution results in a significant reduction in process speed and may cause unevenness in the separator belt due to sudden stops and / or restarts of the belt, which in turn may impair the manufacturing quality of the final product.

[0050] In fact, the applicant has concluded that this significant reduction in process speed will inevitably lead to a zero-speed phase in the displacement speed of the stacked surfaces.

[0051] The applicant also found that such sudden stops and / or restarts subject the belt to an uncontrolled tension state, which could lead to significant micro and macro deformations in the structure of the separator, thereby potentially damaging the materials of key components constituting the stacked structure.

[0052] More seriously, the applicant found that these microscopic and macroscopic deformations of the separator structure could lead to unwanted tension states. When these deformations are associated with excessive tension conditions, they could even cause the strip to break. Conversely, when these deformations are associated with insufficient tension conditions, they could trigger uncontrolled stretching, or even localized stretching, resulting in creases and wrinkles, potentially compromising the effective alignment of the layers and proper contact between the stacked surfaces. Furthermore, the applicant found that these issues related to structural damage to the separator and / or the generation of non-constant uniform tension states, as well as the significant irregularities in the resulting contact surfaces, are particularly critical in certain electric field applications where the desired insulation or contact conditions between different components must be absolutely guaranteed with maximum reliability and reproducibility.

[0053] Therefore, the applicant realized that, compared with existing technical solutions, the stacking speed of the separator strip can be improved by significantly reducing or avoiding damage to the separator strip during the formation of the stacked structure and even during the positioning steps of the foil between the layers of the separator strip.

[0054] The applicant ultimately discovered that by avoiding stopping the stacked surfaces and maintaining continuous movement of the stacked surfaces, the speed of the stacking operation could be increased without affecting the dimensional accuracy of the product, the dimensional accuracy and spatial unfolding of the stacked structure, or the uncontrolled harmful tension state on the processed strip.

[0055] Because of these characteristics, the belt can advance at increased unfolding and stacking speeds, thereby overcoming the limitations of process speeds that can be adopted based on the teachings of the prior art.

[0056] Furthermore, the applicant has found that the invention can also be advantageously applied to the following steps: gripping the strip to begin stacking on the desired stacking surface, or cutting the separator strip and positioning the foil on the separator strip.

[0057] Therefore, in a first aspect, the present invention relates to a stacking apparatus, preferably for stacking separator strips and foil sheets.

[0058] Preferably, the device includes a stacking unit.

[0059] Preferably, the device includes a feeding unit disposed immediately upstream of the stacking unit, and the feeding unit is configured to feed the separator strip along a feeding path.

[0060] Preferably, the stacking unit includes a stacking surface configured to receive the separator strip and the foil to form a stacked structure of the separator strip.

[0061] Preferably, the device includes an actuation unit configured to move the stacked surface relative to the feeding unit in a continuous motion along a second working path that defines a closed curve.

[0062] In this way, the applicant has discovered that it is possible to overcome the limitations of the prior art and thus avoid the reversal point of the second working path of the stacked surface, that is, the point where the displacement speed of the stacked surface is zero.

[0063] In practice, the above solution is not feasible when the second working path is limited to a segment (straight or curved) or to an open curve where the endpoints of the path do not coincide.

[0064] In other words, the applicant discovered that by avoiding reversal points, the stacked surfaces could maintain continuous movement while also creating a relative "mobile stop" state between different devices.

[0065] Thanks to this technical solution, the applicant has found that it can not only shorten the process time, but also avoid sudden deceleration and acceleration, thereby extending the average service life of the relevant operating devices and significantly reducing unnecessary tension that may act on the separation belt.

[0066] Based on the second aspect, the present invention also relates to a method for forming a stacked structure of separators, preferably, the stacked structure of separators is used for an electrochemical cell intended to produce a battery.

[0067] Preferably, the method includes: arranging a feeding unit located immediately upstream of the stacked unit, and the feeding unit being configured to feed the separator strip along a feeding path.

[0068] Preferably, the method includes: arranging the stacking unit, the stacking unit including a movable stacking surface configured to cause the separator strips to stack themselves.

[0069] Preferably, the method includes: arranging a manipulating unit configured to move the stacked surface relative to the feeding unit in a continuous motion along a second working path that defines a closed curve.

[0070] Preferably, the method includes: constraining the first layer of the separator strip on the stacked surface.

[0071] Preferably, the method includes: constraining at least one additional layer of the separator strip to the stacked surface, which is continuously displaced in motion, thereby moving the stacked surface relative to the feeding unit along the working path to form the stacked structure.

[0072] Based on this, the same advantages as those described above can also be achieved.

[0073] In at least one of the foregoing aspects, the present invention may have at least one of the following additional preferred features.

[0074] Preferably, the feeding unit includes an outlet section of the separator that intersects with the reference plane.

[0075] Preferably, the second path crosses the reference plane.

[0076] In this way, the desired stacked structure can be obtained efficiently by utilizing continuous strips and folding the strips themselves without interruption to obtain the desired number of stacked layers.

[0077] Preferably, the feeding unit includes a departure orientation control device disposed immediately upstream of the stacking unit, the departure orientation control device defining the departure reference direction of the separator strip.

[0078] Preferably, the reference plane is parallel to the departure direction from the reference plane.

[0079] In this way, the layering process of the separator strips can be managed optimally by minimizing the tension on the separator strips and forming a compact and efficient device.

[0080] Preferably, the reference plane is the plane of symmetry of the second working path.

[0081] In this way, the total number of necessary shifts of movable parts can be optimized, thus making the second working path symmetrical.

[0082] Preferably, the second working path defines a curve with two segments that intersect at a point located on the reference plane.

[0083] This ideally reduces the displacement that the stacked surfaces must perform in order to form the desired stacked structure.

[0084] Preferably, the second working path has a generally bilobal shape.

[0085] Because of this scheme, the second working path can be minimized by obtaining a sufficiently long potential movement pause region, preferably a sufficiently long potential movement pause region identified in a region far from the intersection point.

[0086] Preferably, the reference plane is coplanar with the separation zone, depending on the departure reference direction.

[0087] In this way, the possible distortion that may occur in the separator during the overlay step can be minimized.

[0088] Preferably, the stacking unit includes a first blocking device and / or a second blocking device, the first blocking device and / or the second blocking device being configured to selectively constrain the separator strip at a first constraint position and / or a second constraint position near the stacking surface to form a stacking structure of the separator strip.

[0089] Preferably, the departure orientation control device is configured to define an end segment of the separating strip, the end segment being included between the departure orientation control device and an adjacent first or second blocking device.

[0090] Preferably, the manipulation unit includes a second manipulation device configured to move the stacked surface relative to the feeding unit between a first stacking position and a second stacking position:

[0091] The first stacking position defines a first end segment of the dividing strip, in which the layers of the stacked structure are constrained to the stacking unit by the first blocking device and / or the second blocking device;

[0092] The second stacking position is different from the first stacking position. The second stacking position defines a second end segment of the separator, which has a length substantially the same as that of the first end segment. In the second stacking position, the additional layers of the stacked structure are constrained to the stacking unit relative to the first stacking position by the first blocking device and / or the second blocking device.

[0093] In this way, the stacked structure can be formed continuously by stacking layers of substantially equal length of the separating strips as needed.

[0094] Preferably, the second actuating device is configured to move the stacked surface relative to the feeding unit such that, along the second working path between the first stacked position and the second stacked position, the length of the first end segment increases by an amount approximately equal to the distance between the first blocking device and the second blocking device.

[0095] In this way, the correctly sized dividers to be stacked can be arranged in each layer of the stacked structure while maintaining compact and efficient movement.

[0096] Preferably, the actuation unit includes a first actuation device of the departure orientation control device, the first actuation device being configured to shift the departure orientation control device along a first working path.

[0097] Preferably, when the stacked surface is in the first stacked position or the second stacked position, the departure orientation control device is in the same position relative to the feeding unit.

[0098] In this way, an ideal stacking cycle of two layers of the separator can be achieved, thus returning to the same reference configuration. This scheme allows the operation to be easily repeated according to the required total number of stacking layers.

[0099] Preferably, for each complete shift between the first stacking position and the second stacking position, the second working path includes at least one receiving segment parallel to the departure reference direction.

[0100] In this way, the predetermined object can be released in a compact and efficient manner.

[0101] Preferably, the departure direction from the reference is perpendicular to the stacked surface; more preferably, the departure direction from the reference is vertical.

[0102] In this way, the separator can be deployed in the ideal direction and a release step can be performed, thereby improving operational accuracy.

[0103] Preferably, the feeding unit includes a first orientation control device positioned upstream of the departure orientation control device along the feeding path to define a storage section of the separation band between the first orientation control device and the departure orientation control device.

[0104] Preferably, the first actuating device of the departure orientation control device is configured to shift the departure orientation control device along a first working path.

[0105] Preferably, the first actuating device is configured to shift the departure orientation control device between a proximity configuration and an extension configuration:

[0106] In the proximity configuration, the departure orientation control device is spaced apart from the first orientation control device by a minimum distance, the minimum distance being measured based on the length of the separating band when the separating band is located between the first orientation control device and the departure orientation control device; and

[0107] In the extended configuration, the departure orientation control device is spaced apart from the first orientation control device by a maximum distance, the maximum distance being measured based on the length of the separating band when the separating band is located between the first orientation control device and the departure orientation control device.

[0108] Preferably, the first actuating device is configured to shift the departure orientation control device so that the separator can maintain the same angular orientation in all spatial configurations, including those between the proximity configuration and the extension configuration, at the storage section, and such that only the portion of the separator downstream of the departure orientation control device is the end segment whose angular orientation changes as the stacked structure of the separator is being formed.

[0109] Because of these features, the required amount of tape for use in other steps can be stored by utilizing the displacement of the movable departure orientation control device. In this way, it is easier to maintain continuous tape feeding while providing steps where the separator tape is not actually stacked on the stacking surface.

[0110] In other words, in this way, a non-stop process can be further executed, thereby optimizing the completion time of the stacked structure for the electrochemical unit, avoiding any sudden braking and acceleration of the various related working units—which would shorten the average lifespan of the various related working units—and always maintaining a constant tension in the separator strip.

[0111] It is noteworthy that the applicant recognizes that a variable storage section can be formed within the separation zone, which can also serve as a movable exit section of the separation zone located immediately upstream of the stacked area. More specifically, the applicant has discovered that a departure orientation control device can be moved relative to the stacked surface itself in a cooperative but potentially independent manner, the departure orientation control device determining the final management point of the zone located upstream of the stacked surface.

[0112] Therefore, the applicant designed the following two steps by constructing a substantially constant following state based on the displacement component between the departure orientation control device and the stacked surface: the first step is to shorten the storage section while maintaining a substantially constant distance between the orientation control device and the stacked surface based on the required displacement component; the second step is to increase the storage section during subsequent steps in which the displacement of the departure orientation control device is the same as the displacement of the stacked surface.

[0113] In other words, in the second step, a “movement pause” state is executed, in which processing tasks that would normally need to be performed during process pauses due to the complexity or precision level of the processing tasks can be performed, even if the stacked surfaces continue to move and therefore the separator strip is continuously fed.

[0114] In addition, the applicant has achieved a separation between uninterrupted unfolding and overlay that can be interrupted as needed or required.

[0115] More specifically, this valuable technical solution enables the formation of two distinct working paths for the departure orientation control device and the stacked surface, respectively. These two distinct working paths include the same follow segment and a follow segment based on the same displacement component, in which the stacked surface performs a displacement that is larger in absolute value than the displacement performed by the departure orientation control device.

[0116] In other words, the departure orientation control device and the stacked surface are shifted by corresponding first and second manipulation devices, respectively. The first and second manipulation devices are configured such that, throughout the entire duration of the first and second working paths, the first and second manipulation devices move along at least one shift component, and in the second step common to the first and second working paths, the first and second manipulation devices follow exactly the same shift component.

[0117] In this way, a greater quantity of tape than that fed can be requested and stacked while the separating tape is being fed at a constant speed, thereby recovering the previously stored amount by extending the storage section.

[0118] The storage step preferably corresponds to the transition from the proximal configuration to the extended configuration, while the step of requiring and using more tape than the amount of tape fed corresponds to the transition from the extended configuration to the proximal configuration.

[0119] Furthermore, due to this technical solution, it can be seen that only the angular orientation of the end segments changes during the stacking step, thereby reducing or eliminating the sail effect caused by the separator and improving the quality of the stacking process.

[0120] Preferably, the actuation unit is configured to shift the departure orientation control device while moving along the stacked surface according to at least one shift component.

[0121] In this way, the stacking process can be performed by maintaining a constant distance and thus reducing the positional variation between the stacked surface and the feeding unit.

[0122] Preferably, the manipulation unit is configured to perform the following between the departure orientation control device and the stacked surface for at least 80%, more preferably 90%, or even more preferably 100% of the second working path. According to one embodiment, more preferably, the following is performed for at least 80%, more preferably 90%, or even more preferably 100% of the time of the second working path.

[0123] In this way, the sail effect can be effectively reduced for most of the process steps related to the unfolding and stacking of the separators, while keeping the first distance constant and equal to a predetermined value over time. Furthermore, predetermined and limited variations in this first distance can be provided, specifically designed to achieve further advantages without compromising the tension state or damaging the separators to be stacked, while still ensuring a high overall process speed.

[0124] Furthermore, this technical solution can provide variations in the relative velocity or trajectory between the departure orientation control device and the stacked surface, thereby allowing for increases or decreases in the extension length of the separator downstream of the departure orientation control device and / or changes in the stacking configuration.

[0125] Preferably, the manipulation unit is configured to shift the departure orientation control device while moving in accordance with the departure reference direction and following the stacked surface.

[0126] In this way, the device according to the invention can have a more compact and efficient configuration.

[0127] Preferably, the end segment is oriented according to a deviation direction that is tilted relative to the departure reference direction by a deviation angle that varies according to the second working path.

[0128] Preferably, the first operating device is configured such that:

[0129] o By shifting the departure orientation control device from the extended configuration to the proximity configuration, the absolute value of the deviation angle changes from essentially 0° to essentially 90°;

[0130] o By shifting the departure orientation control device from the proximity configuration to the extension configuration, the absolute value of the deviation angle varies between approximately 80° and approximately 100°, preferably, the absolute value of the deviation angle remains approximately constant at 90°.

[0131] Because of this technical solution, a configuration can be determined in which the separating strips can be distributed at a constant speed, while maintaining the same angular orientation of the stacked surfaces for a certain period of time.

[0132] Advantageously, during the transition from the proximity configuration to the extension configuration, the separation zone can be subjected to processing procedures that would normally require a complete shutdown of the process.

[0133] The applicant defines the internal structure of this configuration as a "movement pause".

[0134] In other words, this optimizes the movement pause step, which can be identified when the deviation angle is approximately 90° relative to the stacking step, and the stacking step can be identified when the absolute value of the deviation angle changes from approximately 0° to approximately 90°. This solution allows for a compact process with optimized steps, without any interruptions.

[0135] Preferably, the device includes a first foil release assembly and / or a second foil release assembly.

[0136] Preferably, the first foil release assembly and / or the second foil release assembly correspondingly include a first shifting device and / or a second shifting device disposed relative to the second actuation device. The first shifting device and / or the second shifting device are used to release the first foil or the second foil onto the portion of the separator located on the stacked surface at a minimum release distance from the stacked surface during the receiving segment of the second working path, when the first foil release assembly or the second foil release assembly moves closer to the stacked surface.

[0137] Preferably, the proximity motion is configured to: during the receiving segment, generate a state in which the relative velocity between the first foil release assembly and / or the second foil release assembly and the stacked surface is substantially zero.

[0138] In this way, the construction of the stacked structure using electrode foils placed between the layers of the separator can be managed, thereby optimizing the alignment of the electrode foils during the release step so that the desired electrochemical unit can be obtained in a precise and efficient manner.

[0139] In particular, when releasing using a purely vertical maneuvering approach motion, potential undesirable horizontal displacement is avoided, and in this way, precise, reliable, and repeatable release and transfer of the foil can be achieved.

[0140] Preferably, the receiving segment is parallel to the departure reference direction; more preferably, the receiving segment is perpendicular to the stacked surface; and even more preferably, the receiving segment is vertical.

[0141] Preferably, the first shifting device and / or the second shifting device are motion mechanisms with two degrees of freedom; more preferably, the first shifting device and / or the second shifting device are a combination of horizontal guides and vertical guides.

[0142] In this way, complex movements of the displacement device in space can be performed efficiently.

[0143] Preferably, the approach movement occurs during the displacement of the departure orientation control device from the approach configuration to the extension configuration.

[0144] Preferably, the approaching motion begins substantially at the approaching configuration, and the receiving segment ends substantially at the extending configuration.

[0145] In this way, the release process steps can be optimized, thereby minimizing potential damage to the separator.

[0146] Preferably, the approach motion and / or the receiving segment is a pure vertical translation.

[0147] In this way, the foil can be approached and / or released in a precise manner, thereby utilizing the friction generated by gravity and avoiding any undesirable horizontal displacement.

[0148] Preferably, the approach movement is the same as the displacement performed by the departure orientation control device and the stacked surface.

[0149] This sophisticated coordination mechanism ensures that the release of the foils occurs under the following conditions: minimal potential damage to the forming stacked structure; minimal sail effect; and constant tension of the separator strips, which is ensured by the ability to selectively determine the storage section and perform continuous movement of the stacked surfaces, which is allowed by the fact that the entire system is vertically displaced from the proximity configuration to the extension configuration when the first or second foil is released.

[0150] Preferably, the first actuating device and / or the second actuating device are configured to move the departure orientation control device and / or the stacked surface accordingly, so that the departure orientation control device and / or the stacked surface are displaced relative to each other while moving according to the departure reference direction, thereby maintaining the absolute value of the deviation angle greater than 60°, more preferably greater than 70°, and even more preferably greater than 80° when the extension length of the end segment is greater than 1 / 3 of the maximum length between the first constraint position and the second constraint position of the separator relative to the stacked surface.

[0151] The applicant discovered that, due to these features, the stacked surface can be quickly, efficiently, and reversibly shifted in a small space from a state with a deviation angle of +60° to a state with a deviation angle of -60°, more preferably from +70° to -70°, and even more preferably from +80° to -80°, thereby allowing most of the end section of the separator to extend according to a substantially constant deviation angle, and thus allowing substantially no sail effect to occur on the conveyor belt.

[0152] In this way, the sail effect on the belt segment can be minimized by shortening the extension length of the belt segment included downstream of the departure orientation control device.

[0153] Preferably, the manipulation unit is configured to move the departure orientation control device and / or the stacked surface accordingly to maintain a first distance between the departure orientation control device and the stacked surface, the first distance being measured according to the departure reference direction and being between 0 mm and 30 mm, more preferably between 0 mm and 15 mm, or even more preferably substantially equal to 0 mm.

[0154] In this way, the applicant found that a sufficiently contained distance can be maintained between the departure orientation control device and the stacked surface. This distance is preferably limited taking into account the overall dimensional constraints of the relevant motion mechanism.

[0155] Thanks to this solution, the sail effect on the belt segment can be further minimized by shortening the extension length of the belt segment downstream of the departure orientation control device.

[0156] Preferably, the first distance is substantially constant for at least 40%, more preferably at least 50%, more preferably at least 80%, and even more preferably 100% of the time of the second working path.

[0157] In this way, the sail effect can be effectively reduced for most of the process steps related to the unfolding and stacking of the separators, while keeping the first distance constant and equal to a predetermined value over time. Furthermore, predetermined and limited variations in this first distance can be provided, specifically designed to achieve further advantages without compromising the tension state or damaging the separators to be stacked, while still ensuring high overall process speed.

[0158] Preferably, the manipulation unit is configured to displace the departure orientation control device relative to the stacked surface by defining a second distance between the departure orientation control device and the stacked surface, such that:

[0159] - When the deviation angle is between +80° and -80°, the second distance decreases to a minimum; and / or

[0160] When the deviation angle is between +81° and +100° or between -81° and -100°, the second distance is selectively extended.

[0161] In this way, the solution provides greater process freedom, adaptability, or modularity, allowing for changes in the extension length of the end sections of the separator without significantly affecting the sail effect, maintaining high process speeds, and ensuring constant tension in the separator.

[0162] Preferably, when the deviation angle is between +80° and -80°, the second distance is substantially equal to the first distance.

[0163] In this way, when the strip must change its angular orientation significantly, i.e. when the value of the deviation angle changes, the end sections of the separating strip are kept as confined as possible to reduce or eliminate any possible sail effect.

[0164] Preferably, when the deviation angle is between +81° and +100° or between -81° and -100°, the second distance is between 0% and 10% of the maximum length included between the first constraint position and the second constraint position.

[0165] This technical solution allows for further modification of the extension length of the end segments—which also depends on the specific specifications of the stacked structure to be formed—and / or avoids any interference between the motion mechanisms installed in the equipment.

[0166] Preferably, when the deviation angle is approximately +90° or -90°, the first distance changes as follows:

[0167] When approaching the stacked surface, the first distance changes from the constant value by a value between the first distance and 200% of the first distance; or

[0168] When moving away from the stacked surface, the first distance changes from the constant value to a value between the first distance and 200% of the first distance.

[0169] In this way, the overlapping surface can be displaced beyond the state perpendicular to the departure direction, thereby allowing the end segments of the separators overlapping the overlapping surface to better abut against the overlapping surface, thus improving the forming accuracy of the overlapping structure; alternatively, the extension length of the end segments can be increased to more effectively avoid possible interactions between related motion mechanisms.

[0170] For clarity, proximity shift is identified as the mutual shift that begins by shortening the distance between the departure orientation control device and the stacked surface. It should be understood that when the amount of proximity shift equals 100% of the first distance, the actual distance between the departure orientation control device and the stacked surface becomes zero; when the amount of proximity shift is greater than 100% of the first distance, it should be understood that the actual distance between the departure orientation control device and the stacked surface begins to increase again, thus maintaining the same proximity direction; when the amount of proximity shift equals 200% of the first distance, the departure orientation control device is located on the opposite side of the stacked surface relative to the initial configuration corresponding to the first distance, such that the distance between the departure control device and the stacked surface is equal to 100% of the first distance, but on the opposite side relative to the stacked surface.

[0171] Preferably, the first constraint position and / or the second constraint position of the separator band relative to the stacked surface are points on the stacked surface where the separator band is constrained by a first blocking device and / or a second blocking device included in the stacked unit, respectively.

[0172] In this way, portions of the end segments of the separators to be stacked can be constrained and precisely defined to form the desired stacked structure. Simultaneously, due to the constraint points on the end segments, portions of the separators potentially exposed to lateral hydrodynamic pressure asymmetry—which would produce a sail effect—can be managed and minimized.

[0173] According to a preferred embodiment, the first blocking device and / or the second blocking device is a clamp, a suction cup, or an electromagnetic system adapted to selectively hold a portion of the separating strip integrally with the stacked surface.

[0174] In this way, the desired portion of the end segment can be reversibly constrained at different points according to a preset time sequence.

[0175] According to one embodiment, the stacked surface has a generally planar extension with a generally rectangular base. The dimensions of the stacked surface can be set according to the required specifications of the stacked structure to be formed.

[0176] Preferably, the first blocking device and / or the second blocking device are constrained by permissible coplanar translation relative to the stacked surfaces.

[0177] In other words, the first blocking device and / or the second blocking device are constrained to a variable fixed position relative to the stacked surface in the direction of the distance between the first blocking device and the second blocking device.

[0178] In this way, the required specifications of the overlay surface can be easily and quickly adjusted according to the overlay surface used.

[0179] Preferably, the first blocking device and / or the second blocking device are constrained by a permissible vertical translation relative to the stacked surface.

[0180] This technical solution allows for more effective constraint of the separation zone relative to the stacked surface during the formation of the stacked structure.

[0181] Preferably, the departure orientation control device comprises a pair of rollers.

[0182] This technical solution allows the separator strip to be guided in a facilitating manner based on changes in the deviation angle, thereby minimizing potential damage to the strip itself.

[0183] Preferably, the pair of rollers are facing each other and are designed such that the separating belt passes between the pair of rollers.

[0184] In this way, the separation strip can be guided more effectively according to the required departure reference direction.

[0185] Preferably, the pair of opposing rollers have the same diameter and are either idling or in a controlled rotation about the central axis of rotation of the pair of rollers by means of direct motorization or indirect motorization via belt, chain or similar means.

[0186] In this way, surface deformation can be avoided and the movement of the separator can be effectively guided, thereby enabling the separator to move locally relative to the upstream feed rate of the separator.

[0187] Preferably, the first orientation control device is an idle roller.

[0188] In this way, the separator can be precisely guided along the feeding path.

[0189] Preferably, the separating strip is fed continuously, and more preferably, the separating strip is fed continuously at a substantially constant feeding rate.

[0190] In this way, all the necessary process steps, including those related to movement pauses, can be performed, thereby maintaining a continuous supply of the belt and thus simplifying the design of the device to manage the operation.

[0191] In addition, this step allows for minimizing the tension that may be generated on the separator strip.

[0192] Preferably, the first and second actuating devices are configured to generate a relative displacement between the stacked surface and the departure orientation control device, so as to maintain a substantially constant deviation angle relative to the departure reference direction for a variation in the extension length of the end segment, preferably between 10% and 100%, more preferably between 20% and 90%, or even more preferably between 40% and 60%, of the maximum length of the separator strip relative to the first and second constraint positions of the stacked surface.

[0193] The applicant discovered that, due to these features, the angular orientation between the orientation control device and the stacking surface can be kept constant during the unfolding and / or stacking steps, thus preventing the sail effect from occurring on the separators, because the angular variation conditions that would have caused the formation of a transverse hydrodynamic pressure asymmetry on the separators have disappeared.

[0194] Preferably, the relative displacement occurs when the deviation angle is between +81° and +100° or between -81° and -100°.

[0195] In this case, the variation in the extension length of the end section of the separator occurs under conditions that are substantially perpendicular to the departure reference direction of the separator from the orientation control device, thereby allowing for the desired variation in the amount of separator, which, for example, is used to more effectively avoid dimensional limitations of other nearby motion mechanisms.

[0196] According to other embodiments, the relative displacement occurs when the deviation angle is substantially equal to 0°.

[0197] This technical solution allows for the unfolding of the separator strip while maintaining the same angular orientation given by the departure orientation control device, thereby further reducing the potential damage and deformation of the separator strip.

[0198] Preferably, the method includes the technical feature that the feeding unit includes an outlet section of the separator strip, which intersects with a reference plane.

[0199] Preferably, the second path crosses the reference plane.

[0200] In this way, the desired stacked structure can be obtained efficiently by utilizing continuous strips and folding the strips themselves without interruption to obtain the desired number of stacked layers.

[0201] Preferably, the feeding unit includes a departure orientation control device disposed immediately upstream of the stacking unit, the departure orientation control device defining the departure reference direction of the separator strip.

[0202] Preferably, the reference plane is parallel to the departure direction from the reference plane.

[0203] In this way, the layering process of the separator strips can be managed optimally by minimizing the tension on the separator strips and forming a compact and efficient device.

[0204] Preferably, the reference plane is the plane of symmetry of the second working path.

[0205] In this way, the total number of necessary shifts of movable parts can be optimized, thus making the second working path symmetrical.

[0206] Preferably, the second working path defines a curve with two segments that intersect at a point located on the reference plane.

[0207] This ideally reduces the displacement that the stacked surfaces must perform in order to form the desired stacked structure.

[0208] Preferably, the second working path has a generally bilobal shape.

[0209] Because of this scheme, the second working path can be minimized by obtaining a sufficiently long potential movement pause region, preferably a sufficiently long potential movement pause region identified in a region far from the intersection point.

[0210] Preferably, the reference plane is coplanar with the separation zone, depending on the departure reference direction.

[0211] In this way, the possible distortion that may occur in the separator during the overlay step can be minimized.

[0212] Preferably, the method includes: arranging the stacking unit, the stacking unit including a first blocking device and / or a second blocking device, the first blocking device and / or the second blocking device being configured to selectively constrain the layers of the separating strip relative to the stacking surface.

[0213] Preferably, the method includes: arranging the feeding unit, wherein the departure orientation control device is configured to define an end segment of the separating strip, the end segment being included between the departure orientation control device and an adjacent first or second blocking device.

[0214] Preferably, the method includes: arranging the manipulation unit, the manipulation unit including a second manipulation device configured to move the stacked surface relative to the feeding unit in a continuous motion along the second working path.

[0215] Preferably, the method includes constraining a first layer of the separator strip on the stacked surface to define the end segment.

[0216] Preferably, the method includes moving the stacked surface from a first stacking position to a second stacking position in a continuous motion using the first manipulating device:

[0217] The first stacking position defines the first end segment of the dividing strip, and in the first stacking position, the layers of the stacked structure are constrained to the stacking unit by the first blocking device and / or the second blocking device;

[0218] The second stacking position is different from the first stacking position. The second stacking position defines the second end segment of the separator. In the second stacking position, the additional layers of the stacked structure are constrained to the stacking unit relative to the first stacking position by the first blocking device and / or the second blocking device.

[0219] Preferably, the method includes: constraining the additional layer relative to the first stacking position by means of the first blocking device and / or the second blocking device, and displacing the stacking surface such that the second end segment at the second stacking position has the same length as the first end segment at the first stacking position.

[0220] Preferably, the method includes repeating the above operations in the following manner: moving the stacked surface from the second stacked position to the first stacked position in a continuous motion manner by means of the first manipulating device, constraining the additional layer relative to the second stacked position by means of the first blocking device and / or the second blocking device, and displacing the stacked surface such that the first end segment of the first stacked position has the same length in terms of module as the second end segment of the second stacked position, in order to return to the same state at the beginning of the continuous motion of the stacked surface.

[0221] In this way, the stacked structure can be formed continuously by stacking layers of substantially equal length of the separating strips as needed.

[0222] Preferably, the second actuating device is configured to move the stacked surface relative to the feeding unit such that, along the second working path between the first stacked position and the second stacked position, the length of the first end segment increases by an amount approximately equal to the distance between the first blocking device and the second blocking device.

[0223] In this way, the correctly sized dividers to be stacked can be arranged in each layer of the stacked structure while maintaining compact and efficient movement.

[0224] Preferably, the method includes: arranging a first actuating device included in the actuating unit, the first actuating device being configured to shift the departure orientation control device along a first working path.

[0225] Preferably, the method includes: shifting the departure orientation control device such that when the stacked surface is in the first stacked position or the second stacked position, the departure orientation control device is in the same position relative to the feeding unit.

[0226] In this way, an ideal stacking cycle of two layers of the separator can be achieved, thus returning to the same reference configuration. This scheme allows the operation to be easily repeated according to the required total number of stacking layers.

[0227] Preferably, the method includes the feature that, for each complete shift between the first stacking position and the second stacking position, the second working path includes at least one receiving segment parallel to the departure reference direction.

[0228] In this way, the predetermined object can be released in a compact and efficient manner.

[0229] Preferably, the departure direction from the reference is perpendicular to the stacked surface; more preferably, the departure direction from the reference is vertical.

[0230] In this way, the separator can be deployed in the ideal direction and a release step can be performed, thereby improving operational accuracy.

[0231] Preferably, the method includes: arranging a first orientation control device included in the feeding unit, the first orientation control device being positioned upstream of the departure orientation control device along the feeding path to define a storage section of the separation zone between the first orientation control device and the departure orientation control device.

[0232] Preferably, the method includes: configuring the first actuating device of the departure orientation control device such that the departure orientation control device is shifted along a first working path.

[0233] Preferably, the method includes: shifting the departure orientation control device between a proximity configuration and an extension configuration via the first actuation device:

[0234] In the proximity configuration, the departure orientation control device is spaced apart from the first orientation control device by a minimum distance, the minimum distance being measured based on the length of the separating band when the separating band is located between the first orientation control device and the departure orientation control device; and

[0235] In the extended configuration, the departure orientation control device is spaced apart from the first orientation control device by a maximum distance, the maximum distance being measured based on the length of the partition when the partition is between the first orientation control device and the departure orientation control device;

[0236] o Thus, in all spatial configurations that the separator can present at the storage section, including the proximity configuration and the extension configuration, maintain the same angular orientation, and the portion of the separator downstream of the departure orientation control device is only the end segment whose angular orientation changes as the stacked structure of the separator is being formed.

[0237] Because of these features, the required amount of tape for use in other steps can be stored by utilizing the displacement of the movable departure orientation control device. In this way, it is easier to maintain continuous tape feeding while providing steps where the separator tape is not actually stacked on the stacking surface.

[0238] Preferably, the actuation unit is configured to cause the departure orientation control device to follow the displacement of the stacked surface according to at least one displacement component.

[0239] In this way, the stacking process can be performed by maintaining a constant distance and thus reducing the positional variation between the stacked surface and the feeding unit.

[0240] Preferably, the method includes performing the following between the departure orientation control device and the stacked surface for at least 80%, more preferably 90%, or even more preferably 100% of the time of the second working path.

[0241] In this way, the sail effect can be effectively reduced for most of the process steps related to the unfolding and stacking of the separators, while keeping the first distance constant and equal to a predetermined value over time. Furthermore, predetermined and limited variations in this first distance can be provided, specifically designed to achieve further advantages without compromising the tension state or damaging the separators to be stacked, while still ensuring a high overall process speed.

[0242] Furthermore, this technical solution can provide variations in the relative velocity or trajectory between the departure orientation control device and the stacked surface, thereby allowing for increases or decreases in the extension length of the separator downstream of the departure orientation control device and / or changes in the stacking configuration.

[0243] Preferably, the departure orientation control device follows the displacement of the stacked surface according to the departure reference direction.

[0244] In this way, the device according to the invention can have a more compact and efficient configuration.

[0245] Preferably, the method includes: identifying the end segment, the end segment being oriented according to a deviation direction, the deviation direction being tilted relative to the departure reference direction by a deviation angle varying according to the second working path.

[0246] Preferably, the method includes: shifting the departure orientation control device via the first manipulation device, such that:

[0247] o When the departure orientation control device shifts from the extended configuration to the approach configuration, the absolute value of the deviation angle changes from essentially 0° to essentially 90°;

[0248] When the departure orientation control device moves from the proximity configuration to the extension configuration, the absolute value of the deviation angle varies between approximately 80° and approximately 100°, preferably, the absolute value of the deviation angle remains approximately constant at 90°.

[0249] Because of this technical solution, a configuration can be determined in which the separating strips can be distributed at a constant speed, while maintaining the same angular orientation of the stacked surfaces for a certain period of time.

[0250] Advantageously, during the transition from the proximity configuration to the extension configuration, the separation zone can be subjected to processing procedures that would normally require a complete shutdown of the process.

[0251] The applicant defines the internal structure of this configuration as a "movement pause".

[0252] In other words, this optimizes the movement pause step, which can be identified when the deviation angle is approximately 90° relative to the stacking step, and the stacking step can be identified when the absolute value of the deviation angle changes from approximately 0° to approximately 90°. This solution allows for a compact process with optimized steps, without any interruptions.

[0253] Preferably, the method includes: arranging a first foil release assembly and / or a second foil release assembly included in the device, the first foil release assembly and / or the second foil release assembly correspondingly including a first shifting device and / or a second shifting device, the first shifting device and / or the second shifting device being configured to correspondingly shift the first foil release assembly and / or the second foil release assembly.

[0254] Preferably, the method includes displacing the first foil release assembly and / or the second foil release assembly according to a proximity movement, the proximity movement being configured relative to the stacked surface to displace a first foil or second foil selectively constrained to the first foil release assembly or the second foil release assembly to a minimum release distance from the constrained portion of the separator located on the stacked surface; the proximity movement is configured to: during the receiving segment, generate a state in which the relative velocity between the first foil release assembly and / or the second foil release assembly and the stacked surface is substantially zero.

[0255] In this way, the construction of the stacked structure using electrode foils placed between the layers of the separator can be managed, thereby optimizing the alignment of the electrode foils during the release step so that the desired electrochemical unit can be obtained in a precise and efficient manner.

[0256] In particular, when releasing using a purely vertical maneuvering approach motion, potential undesirable horizontal displacement is avoided, and in this way, precise, reliable, and repeatable release and transfer of the foil can be achieved.

[0257] Preferably, the receiving segment is parallel to the departure reference direction; more preferably, the receiving segment is perpendicular to the stacked surface; and even more preferably, the receiving segment is vertical.

[0258] Preferably, the method includes the feature that the approach movement occurs during the displacement of the departure orientation control device from the approach configuration to the extension configuration.

[0259] Preferably, the method includes the feature that the approach movement begins substantially at the approach configuration and the receiving segment ends substantially at the extension configuration.

[0260] In this way, the release process steps can be optimized, thereby minimizing potential damage to the separator.

[0261] Preferably, the approach motion and / or the receiving segment is a pure vertical translation.

[0262] In this way, the foil can be approached and / or released in a precise manner, thereby utilizing the friction generated by gravity and avoiding any undesirable horizontal displacement.

[0263] Preferably, the approach movement is the same as the displacement performed by the departure orientation control device and the stacked surface.

[0264] This sophisticated coordination mechanism ensures that the release of the foils occurs under the following conditions: minimal potential damage to the forming stacked structure; minimal sail effect; and constant tension of the separator strips, which is ensured by the ability to selectively determine the storage section and perform continuous movement of the stacked surfaces, which is allowed by the fact that the entire system is vertically displaced from the proximity configuration to the extension configuration when the first or second foil is released.

[0265] Preferably, the method includes: correspondingly moving the departure orientation control device and / or the stacked surface by the first manipulation device and / or the second manipulation device, such that the departure orientation control device and / or the stacked surface are displaced relative to each other while moving according to the departure reference direction, thereby maintaining the absolute value of the deviation angle greater than 60°, more preferably greater than 70°, and even more preferably greater than 80° when the extension length of the end segment is greater than 1 / 3 of the maximum length between the first constraint position and the second constraint position of the separator relative to the stacked surface.

[0266] The applicant discovered that, due to these features, the stacked surface can be quickly, efficiently, and reversibly shifted in a small space from a state with a deviation angle of +60° to a state with a deviation angle of -60°, more preferably from +70° to -70°, and even more preferably from +80° to -80°, thereby allowing most of the end section of the separator to extend according to a substantially constant deviation angle, and thus allowing substantially no sail effect to occur on the conveyor belt.

[0267] In this way, the sail effect on the belt segment can be minimized by shortening the extension length of the belt segment included downstream of the departure orientation control device.

[0268] Preferably, the method includes: moving the departure orientation control device and / or the stacked surface by means of the manipulation unit to maintain a first distance between the departure orientation control device and the stacked surface, the first distance being measured according to the departure reference direction and being between 0 mm and 30 mm, more preferably between 0 mm and 15 mm, or even more preferably substantially equal to 0 mm.

[0269] In this way, the applicant found that a sufficiently constrained distance can be maintained between the departure orientation control device and the stacked surface. This distance is preferably limited taking into account the overall dimensional constraints of the relevant motion mechanism.

[0270] Thanks to this solution, the sail effect on the belt segment can be further minimized by shortening the extension length of the belt segment downstream of the departure orientation control device.

[0271] Preferably, the first distance is substantially constant for at least 40%, more preferably at least 50%, more preferably at least 80%, and even more preferably 100% of the time of the second working path.

[0272] In this way, the sail effect can be effectively reduced for most of the process steps related to the unfolding and stacking of the separators, while keeping the first distance constant and equal to a predetermined value over time. Furthermore, predetermined and limited variations in this first distance can be provided, specifically designed to achieve further advantages without compromising the tension state or damaging the separators to be stacked, while still ensuring high overall process speed.

[0273] Preferably, the method includes displacing the departure orientation control device relative to the stacked surface via the manipulation unit, thereby defining a second distance between the departure orientation control device and the stacked surface, such that:

[0274] - When the deviation angle is between +80° and -80°, the second distance decreases to a minimum; and / or

[0275] When the deviation angle is between +81° and +100° or between -81° and -100°, the second distance is selectively extended.

[0276] In this way, the solution provides greater process freedom, adaptability, or modularity, allowing for changes in the extension length of the end sections of the separator without significantly affecting the sail effect, maintaining high process speeds, and ensuring constant tension in the separator.

[0277] Preferably, when the deviation angle is between +80° and -80°, the second distance is substantially equal to the first distance.

[0278] In this way, when the strip must change its angular orientation significantly, i.e. when the value of the deviation angle changes, the end sections of the separating strip are kept as confined as possible to reduce or eliminate any possible sail effect.

[0279] Preferably, when the deviation angle is between +81° and +100° or between -81° and -100°, the second distance is between 0% and 10% of the maximum length included between the first constraint position and the second constraint position.

[0280] This technical solution allows for further modification of the extension length of the end segments—which also depends on the specific specifications of the stacked structure to be formed—and / or avoids any interference between the motion mechanisms installed in the equipment.

[0281] Preferably, the separating strip is fed continuously, and more preferably, the separating strip is fed continuously at a substantially constant feeding rate.

[0282] In this way, all the necessary process steps, including those related to movement pauses, can be performed, thereby maintaining a continuous supply of the belt and thus simplifying the design of the device to manage the operation.

[0283] In addition, this step allows for minimizing the tension that may be generated on the separator strip.

[0284] Preferably, the method includes: releasing the first group of first foils and the second group of second first foils respectively by placing a folded segment of the separator strip of the stacked structure between each of the first group of first foils and the second group of second first foils.

[0285] In this way, a stacked structure of separating bands can be formed by placing foils, more preferably electrodes, between different folded layers, thereby ensuring effective separation between the different foils contained therein.

[0286] Preferably, the foil is an electrode; more preferably, the foil is a cathode or anode.

[0287] Preferably, the anode and cathode inserted in the stacked structure of the partition strip are positioned in each layer and are positioned alternately to each other in sequence.

[0288] Preferably, the separator is an electrically insulating polymer strip.

[0289] In this way, a stacked structure can be formed in which foils suitable for electrochemical units are housed inside the stacked structure.

[0290] According to another aspect, the present invention relates to a stacking apparatus for stacking separator strips and foil sheets.

[0291] Preferably, the stacking device includes a stacking unit.

[0292] Preferably, the stacking unit includes a stacking surface configured to receive the separator strip and the foil.

[0293] Preferably, the stacking device includes a feeding unit configured to feed the separator strip along a feeding path.

[0294] Preferably, the feeding unit includes a departure orientation control device, which is disposed directly upstream of the stacking unit.

[0295] Preferably, the stacking device includes an actuation unit that includes a first actuation device configured to shift the departure orientation control device along a first working path while the stacking surface is moving.

[0296] Preferably, the manipulation unit includes a second manipulation device configured to shift the stacked surface along a second working path.

[0297] Preferably, the first and second actuating devices are configured to move the departure orientation control device and the stacked surface in a manner of mutual movement that translates substantially only in a direction parallel to the stacked surface by guiding the separator strip to abut against the stacked surface or to overlap the portion of the separator strip constrained to be parallel to the stacked surface.

[0298] In this way, the stacking process can be performed in an improved manner by reducing or controlling the damage to the conveyor belt caused by the sail effect.

[0299] The features and advantages of the present invention will become clearer from the following detailed description of preferred embodiments of the invention, illustrated by way of non-limiting example, with reference to the accompanying drawings, in which:

[0300] · Figure 1 This is a schematic front view of the device according to the present invention;

[0301] · Figures 2 to 5 This is a schematic front view showing the device according to the invention during different operating steps;

[0302] · Figure 6 This is a perspective view of the device implemented according to the present invention;

[0303] · Figures 7 to 12This is a schematic front view showing the device according to the invention during a further operating step;

[0304] · Figure 13 A schematic front view showing details of a stacked structure that can be formed by the device according to the invention;

[0305] · Figures 14 to 18 Schematic diagrams showing details of the operation steps of the device according to the present invention are provided.

[0306] · Figure 19a , Figure 19b , Figure 19c Non-scale schematic front views show details of the operation steps of the device according to the invention.

[0307] First refer to Figure 1 and Figure 2 100 generally represents a stacking device 100 for stacking a separator strip NS and a foil, implemented according to the present invention.

[0308] In a preferred embodiment, the apparatus 100 is used to perform the stacking of separator bands NS for producing electrochemical cells.

[0309] However, it should be understood that this represents possible implementation examples, and the device 100 according to the invention can be used to stack partitions that are also applicable to different uses, or even to areas other than those related to the production of electrochemical units.

[0310] For example, in the field of energy storage, the present invention can also be used to form other stacked components intended for use in batteries or supercapacitors.

[0311] In some implementations, for example, in Figure 1 In the embodiment shown, the device 100 can be used in a production line for a stacked structure S for an electrochemical unit, wherein the separator NS is stacked by folding itself, thereby performing the overlap of layers and placing electrode foils between the layers.

[0312] The separator NS is a polymer strip that, for example, has the function of electrically insulating electrode foils placed between different layers.

[0313] According to the implementation method, the separator NS can be a single material or a multi-layered component including multiple overlapping layers.

[0314] An example of such a material used as a separator is polyethylene.

[0315] The stacked structure S of the separator NS is a series of seamlessly folded layers.

[0316] Reference Figure 11 The two electrode foils, or simply electrodes, are represented by 201 and 301. The two electrode foils, or simply electrodes, are positioned on the separator NS during the stacking step to form the stacked structure S and thus enable the fabrication of the electrochemical unit.

[0317] Specifically, the cathode foil is designated as 201, while the anode foil is designated as 301. An example of a material that can be used as a cathode in foil form is aluminum, while an example of a material that can be used as an anode in foil form is copper.

[0318] In the overall configuration of the device 100, the device 100 implemented according to the embodiment depicted in the accompanying drawings includes a feeding unit 20, a stacking unit 1, an operating unit 130, and a first foil release assembly 200 and / or a second foil release assembly 300.

[0319] In a preferred embodiment, the separator tape NS is supplied by a dedicated dispensing device not shown in the figures. For example, this dispensing device for the separator tape NS may be formed from a large roll in which the separator tape NS is collected so that it can be continuously unwound and thus supplied during operation of the equipment.

[0320] The separator strip NS supplied by the distribution device is then distributed to the feeding unit 20. In a preferred embodiment, the feeding unit 20 is responsible for optimizing the transfer and management of the separator strip NS before it is stacked by the associated stacking unit 1, the features of which will be described in detail below.

[0321] According to a preferred embodiment, the feeding unit 20 includes an inlet section (not shown in the drawings) and an outlet section 22 (as shown in the drawings). Figure 3 As shown), the inlet section is preferably adapted to receive the separator strip NS from the dispensing device, the separator strip NS passing through the outlet section 22 and exiting the feeding unit 20 and being fed to the stacking unit 1. The stacking unit 1 includes a stacking surface 10 adapted to receive the separator strip NS to allow the separator strip NS to be stacked.

[0322] Therefore, the feeding path PA of the separator NS is defined between the inlet section and the outlet section.

[0323] It should be understood that before the separator strip NS is supplied to the feeding unit 20, the separator strip NS may pass through other units, such as those used to perform pretreatment on the strip. For example, the separator strip may undergo pre-cleaning, laser ablation, or surface activation operations to make the surface characteristics of the separator strip uniform.

[0324] In a preferred embodiment, the separator NS is fed into the feeding unit 20 in a continuous manner.

[0325] In other words, the separator NS is introduced into the feeding unit 20 and travels without stopping at a speed greater than zero and preferably substantially constant.

[0326] However, in certain specific situations, it may be necessary to interrupt the continuous supply or slow down the advance of the separator NS to meet other operational requirements related to the specific process being performed.

[0327] According to some implementations, the separator NS can be set to continuously unfold at a constant speed without interrupting the feeding and unfolding of the separator NS, always keeping the associated motion mechanism moving to reduce or avoid sudden acceleration and deceleration of the handling device, and always ensuring a constant tension state.

[0328] For this and other purposes, an accumulation device may be provided, which is configured to accumulate a certain amount of the separation band NS.

[0329] like Figure 1 , Figure 6 , Figure 11 and Figure 12 As shown in the implementation example, the storage device included in the feeding unit 20 may include a first orientation control device R1, which is included on the feeding path PA and positioned upstream of the departure orientation control device R2 relative to the unfolding direction of the separation strip NS, to identify at least one storage segment T of the separation strip NS between the first orientation control device R1 and the departure orientation control device R2.

[0330] According to a preferred embodiment, the device 100 includes an operating unit 130, which in turn includes a first operating device 131.

[0331] according to Figure 11 and Figure 12 In the illustrated implementation example, the first actuation device 131 is configured to shift the departure orientation control device R2 between the proximity configuration CR and the extension configuration CE:

[0332] - In this proximity configuration CR, the departure orientation control device R2 is located at the minimum distance from the first orientation control device R1, which is measured based on the length of the separation strip NS between the first orientation control device R1 and the departure orientation control device R2; and

[0333] - In this extended configuration CE, the departure orientation control device R2 is located at the maximum distance from the first orientation control device R1, which is measured based on the length of the separation strip NS between the first orientation control device R1 and the departure orientation control device R2.

[0334] The amount of stored tape can be variable because: it is conceivable that the amount of stored separator tape NS in terms of length is variable during different steps of the process to meet the specific requirements anticipated as described above.

[0335] According to a preferred embodiment, the actuation unit 130 includes an additional actuation device (not shown in the figures) configured to move the first orientation control device R1 to further determine the required amount of the separator NS included in the storage section T.

[0336] Still refer to Figure 1 , Figure 6 , Figure 11 and Figure 12 It can be seen that the first orientation control device R1 is preferably an idle driven roller, and the part leaving the orientation control device R2 includes two opposing rollers R2a and R2b, with the separating belt NS passing between these two rollers R2a and R2b.

[0337] According to a preferred embodiment, two (or four) opposing rollers R2a, R2b, which are located away from the orientation control device R2, have the same diameter and are either idling or subjected to controlled rotation about the central axis of rotation of the two (or four) rollers R2a, R2b in opposite directions by means of direct motorization or indirect motorization via belt, chain or similar means.

[0338] like Figure 6 As shown in the example, in the storage section T included between the first orientation control device R1 and the exit orientation control device R2, additional idle rollers constrained to a fixed position are provided, which allow the separator strip NS to be wound and guided in a controlled manner.

[0339] More preferably, the feeding unit 20 includes at least one tension control device, and preferably, the feeding unit 20 includes a buffer element positioned at the storage section T.

[0340] Still refer to Figure 1 A schematic diagram of the first control device 131 can be seen, which may include, for example, a horizontal guide, a vertical guide, or a combination thereof.

[0341] Still refer to Figure 1As can be seen, the first actuation device 131 of the departure orientation control device R2 is configured to shift the departure orientation control device R2 along the first working path P1.

[0342] like Figure 1 , Figure 11 and Figure 12 As illustrated in the example, the first working path P1 is preferably a straight line segment, more preferably, the first working path P1 is perpendicular to the stacked surface 10, and even more preferably, the first working path P1 has a vertical orientation.

[0343] In fact, such as Figure 11 and Figure 12 As shown, the two rollers R2a and R2b preferably move in a purely vertical translational manner along the first working path P1, thereby reversibly shifting between the proximal configuration CR and the extended configuration CE. Importantly, during these shifts, the separator strip NS maintains the same angular orientation throughout the tract T. In other words, although the two rollers R2a and R2b are uniformly shifted along the tract T according to a purely vertical translational manner, the orientation of the two rollers R2a and R2b applied to the separator strip NS remains unchanged; that is, the two rollers R2a and R2b do not cause a change in the inclination of the strip during these movements. This means that the separator strip NS in the tract T is not subjected to an asymmetric state of lateral hydrodynamic pressure and therefore is not subject to the sail effect and related potential damage.

[0344] In this way, by changing the distance between the driven roller included in the first orientation control device R1 and the two rollers R2a and R2b included in the exit orientation control device R2, the length of the path that the separator belt must actually travel can be changed, thereby allowing the required amount of separator belt to be stored.

[0345] In this way, taking into account, for example Figure 12 The implementation described herein allows for the increase of the length of the separator belt NS included in the storage section T by reducing the length of the two rollers R2a and R2b; and considering that the input feed speed of the feeding unit 20 is constant or substantially constant, the belt portion downstream of the two rollers R2a and R2b can be slowed down or stopped without necessarily causing the supply of the separator belt NS to stop.

[0346] This approach will be further discussed in the embodiments described in detail below.

[0347] It should also be noted that, in a preferred embodiment, the movement of the two rollers R2a, R2b, or more generally, the movement away from the orientation control device R2, can be associated with a holding device (not shown in the figures) of the separator NS, which is configured to selectively control the advance of the separator NS.

[0348] For example, in some embodiments, in order to control the movement of the separator section NS, a clamp (not shown in the figures) or other similar retaining element may be provided, which acts on the separator when it is necessary to control, retain or stop the separator.

[0349] The clamp can advantageously be movable so that the feed speed of the associated belt can be further adjusted by controlling the movement of the clamp.

[0350] The clamping element can also be associated with a cutting tool, which, if necessary, cuts the separator strips NS to be stacked, thereby interrupting the continuity of the strips within the stacked structure S. This occurs, for example, when the stacking step of the separator strips NS on the stacking surface 10 is completed.

[0351] It is also particularly noteworthy that the rollers included in the first orientation control device R1 and the exit orientation control device R2 allow for the management of the passing separator NS by giving the separator NS a specific orientation (depending on the relative position of the rollers, the diameter of the rollers, etc.) and thus effectively controlling the orientation of the separator NS in space.

[0352] In a preferred embodiment, the driven roller included in the first orientation control device R1 is preferably mounted on a buffer element or similar component that allows the orientation of the separator strip NS to be changed by tilting or moving the axis of rotation of the driven roller itself.

[0353] Now refer to Figures 1 to 12 The stacking unit 1 is arranged immediately downstream of the feeding unit 20 to receive the separation strip NS moved by the feeding unit 20.

[0354] Preferably, the separator strip NS is fed by shifting along the feeding direction, and the departure orientation control device R2 is designed to give a departure reference direction DRU (i.e., final angular orientation) that corresponds to the direction in which the separator strip NS will take when the separator strip can freely continue its applied movement and the constraint and motion mechanism arranged downstream of the departure orientation control device R2 does not interfere.

[0355] For example, from Figure 3 , Figure 6 and Figure 8It can be seen that the DRU is preferably vertical when it leaves the reference direction.

[0356] exist Figure 9 In the example shown, the departure reference direction DRU applied to the separator belt NS by the two rollers R2a, R2b is horizontal. For more practical and clear purposes, an orientation angle α is defined, which defines the angle of the departure reference direction DRU relative to the vertical direction of the environment in which the equipment 100 is installed.

[0357] In this sense, it becomes clear how the configuration of the separator NS relative to the departure orientation control device R2 determines the departure vertical reference direction DRU and is equal to, for example, in... Figure 5 The value obtained for the orientation angle α of 0° in the illustrated embodiment; while... Figure 9 In the embodiment, the implementation is shown in relation to the value of the orientation angle α, which is 90° away from the horizontal reference direction DRU.

[0358] For example Figure 1 or Figure 2 The end segment of the separator NS is represented by TF, and the end segment is defined downstream of the departure orientation control device R2 and upstream of the separator NS relative to the first constraint position PV1 or the second constraint position PV2 of the stacked surface 10.

[0359] It can be seen that, according to Figure 11 and Figure 12 In the preferred embodiment shown, the first constraint position PV1 corresponds to the interference point of the first blocking device 51, and the second constraint position PV2 corresponds to the interference point of the second blocking device 52. The first blocking device 51 and the second blocking position 52 are included in the stacking unit 1 and act on the stacking surface 10. More specifically, and now only referring to... Figure 12 The first blocking device 51 is a device disposed at a distal position relative to the departure orientation control device R2, while the second blocking device 52 is disposed at a proximal position relative to the departure orientation control device R2.

[0360] According to a preferred embodiment, the first blocking device 51 and / or the second blocking device 52 are clamps, suction cups, or electromagnetic systems adapted to selectively hold portions of the separator NS in an integral manner with the stacked surface 10.

[0361] According to Figure 11 Some embodiments are shown by way of example, where the stacked unit 1 includes a plurality of blocking devices 51, 52.

[0362] Still refer to Figure 11As can be seen, the separator NS is constrained by the second blocking device 52. In this state, the end segment TF is limited downstream of the orientation control device R2 and the second blocking device 52.

[0363] Obviously, when the first blocking device 51 is activated, the extension length of the end segment TF and the associated deviation angle β change.

[0364] According to one embodiment, the stacked surface 10 has a generally planar extension with a generally rectangular base. The dimensions of the stacked surface 10 can be set according to the required specifications of the stacked structure S to be formed.

[0365] Furthermore, the relative positions of the first blocking device 51 and / or the second blocking device 52 can also be defined or modified according to the specifications of the desired stacked structure S. In other words, the first blocking device 51 and / or the second blocking device 52 can be constrained by permissible coplanar and / or vertical translations relative to the stacked surface 10.

[0366] According to Figure 11 Some embodiments are shown by way of example, where the stacked unit 1 includes a plurality of blocking devices 51, 52.

[0367] Still refer to Figure 11 As can be seen, the separator NS is constrained by the second blocking device 52. In this state, the end segment TF is limited downstream of the orientation control device R2 and the second blocking device 52.

[0368] Obviously, when the first blocking device 51 is activated, the extension length of the end segment TF and the associated deviation angle β change.

[0369] This is because the first blocking device 51 becomes a device that limits the extension length and angular orientation of the end segment TF.

[0370] Typically, the activation of the blocking system, which is positioned between the downstream departure orientation control device R2 and the further downstream blocking device—this activation enables the removable constraint of the separator NS at the stacked surface 10—always causes a change in the extension length of the end segment and, in some cases, a change in the associated deviation angle β.

[0371] Based on the above discussion and, for example, Figure 11 and Figure 12As can be seen from the illustration, the extension length and orientation of the end segment TF can change significantly and rapidly depending on whether the blocking device is engaged with the separator NS. Indeed, it is evident that when the clamping member acts on a segment of the separator NS, thereby integrally constraining that segment to the stacking surface 10, the portion does not undergo further displacement relative to the stacking surface, but rather moves rigidly together with the stacking surface, as if the portion and the stacking surface define a single body. Therefore, in this sense, it should be clearly pointed out how the portion of the separator NS not yet constrained to the stacking surface 10 and located downstream of the orientation control device R2 is identified as the aforementioned end segment TF, characterized in that: before the aforementioned end segment TF of the separator NS is further constrained and acts integrally with the stacking surface 10, the extension length and spatial orientation of the aforementioned end segment TF can change significantly.

[0372] Preferably, and referring to, for example Figure 3 , Figure 5 and Figure 8 An embodiment is shown in which the end segment TF is oriented according to a deviation direction DD, which can be identified downstream of the departure orientation control device R2 and defines a deviation angle β with the departure reference direction DU.

[0373] In addition, if it can be obtained from Figure 3 , Figure 5 and Figure 8 It can be further seen that the deviation angle β relative to the departure direction DRU can vary from approximately +100° to -100°.

[0374] Due to this angular change in the end segment TF, the separator NS can be stacked on the stacking surface 10 by first folding it in one direction and then folding it in the opposite direction, thereby forming a structure as shown in the figure. Figure 13 The diagram shows a series of continuous and overlapping layers.

[0375] Reference Figure 13 It can be seen that the two blocking devices 51 and 52, which act on the first constraint position PV1 and the second constraint position PV2 respectively, can act on the part of the separator NS to be constrained simultaneously or at different times.

[0376] According to a preferred embodiment, the relevant blocking device operates in such a way that, when completion is imminent, once the new separator layer NS is guided to substantially abut against the lower layer of the stacked surface 10 or the stacked structure S, the new separator layer NS is blocked.

[0377] Reference Figure 6It is worth noting how the departure reference direction DRU corresponds to the longitudinal axis of the exit plane PU, which is coplanar with the separation strip NS at the departure orientation control device R2.

[0378] Still refer to Figure 6 As can be seen, according to the preferred embodiment, the reference plane PR that crosses the second path P2 coincides with the exit plane PU.

[0379] According to one embodiment, the device 100 includes an operating unit 130, which includes a first operating device 131 and / or a second operating device 132. The first operating device 131 and / or the second operating device 132 are configured to correspondingly move the departure orientation control device R2 and / or the stacked surface 10, such that the departure orientation control device R2 and / or the stacked surface 10 are displaced relative to each other while moving according to the departure reference direction DR, so that when the extension length of the end segment TF is greater than 1 / 3 of the maximum length included between the first constraint position PV1 and the second constraint position PV2 of the separator NS relative to the stacked surface 10, the absolute value of the deviation angle β remains greater than 60°, more preferably greater than 70°, and even more preferably greater than 80°. Preferably, the maximum length is measured according to a direction perpendicular to the exit plane PU.

[0380] In fact, it can be seen that, considering Figure 1 , Figure 2 , Figure 6 , Figure 11 and Figure 12 As shown, the first actuation device 131 causes the departure orientation control device R2 to shift while following the movement generated by the stacked surface 10 by means of the second actuation device 132. Preferably, the second actuation device 132 may include, for example, a horizontal guide, a vertical guide, or a combination thereof.

[0381] According to a preferred embodiment, the displacement generated by the manipulation device 131 is configured as a pure vertical translation. Since the first manipulation device 131 and the second manipulation device 132 are configured to follow each other, this means that the second manipulation device 132 will displace the stacked surface 10 by the same amount of vertical translation performed by the departure orientation control device R2.

[0382] For example Figure 1 and Figure 2As can be seen, the displacement of the stacked surface 10 generated by the second manipulation device 132 defines the second working path P2, which corresponds to a closed path of a complex shape, such as a bilobal or long arc shape, which includes both horizontal and vertical displacement components. However, the second working path P2 is configured to shift itself in a manner consistent with the first working path P1 leaving the orientation control device R2.

[0383] In other words, the second working path P2 is configured to include a vertical translation component, which is substantially the same in terms of extension length and occurrence time as the pure vertical translation performed by the departure orientation control device R2 according to the first working path P1. Figure 2 In this context, the pure vertical translation component included in the first working path P1 and the second working path P2 is labeled as V1.

[0384] This means that when the stacked surface 10 itself is vertically displaced in a manner consistent with the departure orientation control device R2, a further displacement of the stacked surface 10 according to the horizontal component is also performed.

[0385] In this way, a rapid horizontal displacement of the stacked surface 10 can be generated by changing the deviation angle β at a high speed, resulting in an extension of the end segment TF of the separator NS to approach the stacked surface 10 with a short displacement along the second working path P2, thereby finally achieving an abutment state between the end segment TF and the stacked surface 10 at a value equal to approximately +90° or -90° of the deviation angle β.

[0386] In other words, and now referencing Figure 7 The manipulation unit 130 is configured to displace the departure orientation control device R2 relative to the stacked surface 10 to maintain a substantially constant first distance D1 between the departure orientation control device R2 and the stacked surface 10, as measured according to the departure reference direction DRU, between 0 mm and 30 mm, more preferably between 0 mm and 15 mm, or even more preferably substantially equal to 0 mm, while the stacked structure of the separator NS is being formed.

[0387] For example from Figure 1 and Figure 6 As can be seen and as described above, the first distance D1 measured in the vertical direction is preferably always kept less than the limit value between 0 mm and 30 mm, and is always kept as constant as possible, except for the overall constraints of the related motion mechanism.

[0388] As can be seen, this value can be maintained even when the stacked surface 10 is horizontally displaced by an amount greater than 30 mm, because it is limited only by the distance based on the vertical component.

[0389] According to the preferred implementation method, reference Figure 8 And even refer to Figure 10 It can be seen that when the value of the deviation angle β is close to, for example, +90° or -90°, the first actuation device 131 and the second actuation device 132 are configured to generate a relative displacement SR between the stacked surface 10 and the departure orientation control device R2, so as to maintain the same deviation angle β relative to the departure reference direction DRU substantially constant when the extension length variation of the end segment TF is between 20% and 90% of the maximum length of the separator NS relative to the first constraint position PV1 and the second constraint position PV2 of the stacked surface 10, thereby minimizing the amount of the surface of the separator NS exposed to the lateral hydrodynamic pressure variation caused by the change in the unfolding angle of the separator NS as the stacked structure of the separator NS is being formed.

[0390] In fact, it is clear that when the stacked surface 10 is displaced away from the orientation control device R2 according to the second working path P2 to a deviation angle β with an absolute value equal to 85° ± 10%, this configuration requires the orientation control device R2 to be kept moving with the stacked surface 10 according to at least one component, i.e., keeping the first distance D1 substantially constant, so that the relative displacement of the stacked surface 10 with respect to the orientation control device R2 is substantially horizontal according to a deviation angle β that is substantially equal to +90° or -90°, thereby avoiding the sail effect on the end segment TF of the separator NS in this case.

[0391] Reference Figure 3 and Figure 4 This illustrates a specific case where the deviation angle β is essentially equal to 0°.

[0392] Still refer to Figure 3 An embodiment is shown in which the exit segment 22 intersects the reference plane PR, and the second path P2 crosses the reference plane PR.

[0393] According to, for example Figure 15 In the embodiment shown, when the deviation angle β is approximately +90° or -90°, the first distance D1 changes as follows:

[0394] - When approaching the stacked surface, the first distance D1 changes from the constant value to a value between the first distance and 200% of the first distance; or

[0395] - When moving away from the stacked surface, the first distance D1 changes from the constant value to a value between the first distance and 200% of the first distance.

[0396] Reference Figure 19a , Figure 19b , Figure 19c The diagram illustrates in detail some moments relating to the change of the first distance D1 as the device moves away from the orientation control R2 and towards the stacked surface 10. In the example depicted here, the first distance D1 is measured relative to the vertical axis Z. More specifically, in Figure 19a The diagram schematically illustrates a state where the first distance D1 is equal to 10 mm and the displacement begins. For illustrative purposes only, consider a scenario where the orientation control device R2 is essentially stationary, while the stacked surface 10 shifts to move closer along the reference direction DRU, i.e., upwards. Figure 19b As can be seen, the stacked surface 10 has reached the height away from the orientation control device R2, and the first distance D1 has become almost zero. Figure 19c The following moment is shown: Stacked surface 10 continues Figure 19b The ongoing motion, while maintaining the same direction and orientation, adds an additional vertical upward shift value that is modulo equal to the initial value of the first distance D1. In this configuration, the deviation angle β is approximately equal to 110°.

[0397] Reference Figure 2 The manipulation unit 130 is configured to displace the departure orientation control device R2 relative to the stacked surface 10 by defining a second distance D2 between the departure orientation control device R2 and the stacked surface 10, such that:

[0398] When the deviation angle β is between +80° and -80°, the second distance D2 decreases to its minimum value; and / or

[0399] When the deviation angle β is between +81° and +100° or between -81° and -100°, the second distance D2 is selectively extended.

[0400] Still refer to Figure 2 It can be seen that the second distance D2 is identified as the minimum distance between any part of the departure orientation control device R2 and any part of the stacked surface 10.

[0401] Therefore, it can be clearly understood that when the deviation angle β is between +80° and -80°, the second distance D2 can preferably be substantially equal to the first distance D1, thereby satisfying the condition set for the first distance D1 between 0mm and 30mm.

[0402] Furthermore, according to a preferred embodiment, when the deviation angle β is between +81° and +100° or between -81° and -100°, the second distance D2 is between 0% and 70% of the maximum length included between the first constraint position PV1 and the second constraint position PV2.

[0403] Alternatively, according to other preferred embodiments, when the deviation angle β is between +81° and +100° or between -81° and -100°, the second distance D2 is between 0% and 10% of the maximum length included between the first constraint position PV1 and the second constraint position PV2.

[0404] According to, for example Figure 11 , Figure 16 and Figure 17 In the illustrated embodiment, the device preferably includes a first foil release assembly 200 and a second foil release assembly 300, the first foil release assembly 200 and the second foil release assembly 300 being configured relative to the second actuation device 132 such that: during the receiving segment TR of the second working path P2, when the first foil release assembly 200 or the second foil release assembly 300 makes a proximity movement Mac relative to the stacked surface 10, the first foil 201 or the second foil 301 is released at a minimum release distance DmR from the stacked surface 10 onto the portion of the separator NS located on the stacked surface 10, the proximity movement Mac being configured to generate a state of substantially zero relative velocity between the first foil release assembly 200 and / or the second foil release assembly 300 and the stacked surface 10, and the proximity movement Mac having at least one displacement component parallel to the departure reference direction DRU, preferably, the at least one displacement component being perpendicular to the stacked surface 10, more preferably, the at least one displacement component being in a vertical direction.

[0405] According to an embodiment, the first foil release assembly 200 and / or the second foil release assembly 300 respectively include corresponding first shifting device 210 and / or second shifting device 310, the first shifting device 210 and / or second shifting device 310 being configured to selectively shift the first foil release assembly 200 and / or the second foil release assembly 300 according to the proximity movement Mac.

[0406] Preferably, the first shifting device 210 and / or the second shifting device 310 are motion mechanisms with two degrees of freedom. More preferably, the first shifting device 210 and / or the second shifting device 310 are a combination of a horizontal guide and a vertical guide.

[0407] according to Figure 16 and Figure 17 In the preferred embodiment shown, the approach motion Mac basically begins when the first orientation control device R1 and the departure orientation control device R2 are in the approach configuration CR, and the approach motion Mac basically ends when the first orientation control device R1 and the departure orientation control device R2 are in the extension configuration CE.

[0408] Reference Figure 16 The device 100 is shown in a first stacking position Pip1, which is opposite to the second stacking position Pip2 (not shown in the figure) relative to the departure direction DRU.

[0409] As in Figure 16 As can be seen, the first stacking position, Pip1, begins near the configuration CR. Now, let's refer to... Figure 2 and Figure 17 Furthermore, considering the preferred embodiment, it can be seen that this overall configuration means that when the first orientation control device R1 moves vertically away from the orientation control device R2 by displacing itself away from the pure vertical motion V1, thereby shifting from the near configuration CR to the extended configuration CE, the stacked surface 10 and the second foil release assembly 300 perform a motion with the same vertical component V1 to achieve a state of consistent or integrated motion with substantially the same vertical component among the three different devices in this process step.

[0410] This sophisticated synergistic mechanism ensures that the release of the second electrode 301 occurs under the following conditions: minimal potential damage to the forming stacked structure S; minimal sail effect, which is provided by the guarantee condition of the first distance D1 between 0 mm and 30 mm; constant tension of the separator NS, which is ensured by the ability to selectively determine the storage section T and perform continuous movement of the stacked surface, which is allowed by the fact that the entire system vertically shifts itself from the proximity configuration to the extension configuration when the first electrode 201 or the second electrode 301 is released.

[0411] This synergistic mechanism also applies when the first electrode 201 is released by the foil release assembly 300.

[0412] Preferably and with reference Figure 11The first foil release assembly 200 and the second foil release assembly 300 each include a first holding device 230 and a second holding device 330. The first holding device 230 and the second holding device 330 are configured to allow selective holding of the first foil 201 and the second foil 301, for example, selectively holding the first foil 201 and the second foil 301 before and during approach to the moving Mac, and to release the first foil 201 and the second foil 301 by deactivating the first holding device 230 and the second holding device 330, for example, deactivating the first holding device 230 and the second holding device 330 at the end of approach to the moving Mac.

[0413] These first holding devices 230 and second holding devices 330 are vacuum systems, such as suction cups.

[0414] According to one embodiment, the second manipulator 132 is configured to shift the stacked surface 10 along the receiving segment TR of the second working path P2 to bring the stacked surface 10 closer to the first shifting device 210 and / or the second shifting device 310 during the approach motion Mac.

[0415] This technical solution can shorten the approach time and increase the relative speed between the stacked surface 10 and the first foil release assembly 200 or the second foil release assembly 300 during the approach step.

[0416] According to another embodiment, the second actuation device 132 is configured to shift the stacked surface 10 along the receiving segment TR of the second working path P2 to shift the stacked surface 10 away from the first actuation device 210 and / or the second actuation device 310 during the approach movement Mac, the approach being performed by the difference in displacement speed between the stacked surface 10 and the first foil release assembly 200 or the second foil release assembly 300.

[0417] In this way, proximity can be made between the stacked surface 10 and the first foil release assembly 200 or the second foil release assembly 300, and this proximity allows for release in a gradual or non-abrupt manner.

[0418] The present invention also relates to an implementation of a method 500 for forming a stacked structure S of separator bands NS, preferably, the stacked structure S of separator bands NS is used for an electrochemical unit intended to manufacture a battery.

[0419] The method 500 provides the following steps: arranging a device 100 including a fixed frame, wherein a feeding unit 20, an operating unit 130, a stacking unit 1, a first foil release assembly 200, and a second foil release assembly 300 are constrained on the fixed frame.

[0420] The manipulation unit 130 includes a vertical guide 131 and a combined horizontal-vertical guide 132. The vertical guide 131 allows for pure vertical translation of two opposing and counter-rotating rollers R2a and R2b, while the combined horizontal-vertical guide 132 allows for complex spatial displacements, which will be discussed in detail below. According to an alternative embodiment, the departure orientation control device R2 comprises four rollers.

[0421] The stacked surface 10 is mounted on a device integrally constrained to the combined horizontal-vertical guide 132.

[0422] The vertical guide 131 and the combined horizontal-vertical guide 132 are mounted on the fixed frame of the device 100 and guided in a motorized manner.

[0423] Downstream of the distribution area (not shown in the figures), the separator strip NS traverses through the feeding unit 20. See also... (more details and reference...) Figure 1 , Figure 16 and Figure 17 The separator NS travels through the storage section T included in the feeding unit 20, which is defined between the driven roller R1 and two rollers R2a and R2b located at the outlet of the storage section T itself.

[0424] Downstream of the two rollers R2a and R2b, the conveyor belt is stably constrained to the stacked surface 10 by the clamp 52.

[0425] For clarity and comprehensiveness, Table 1 is shown, which illustrates an example of the sequence of operations performed by device 100 according to method 500 for forming stacked structure S.

[0426]

[0427] Table 1. Examples of the main operation sequences used to form the stacked structure S

[0428] Refer to Table 1 and Figure 18 As can be seen, in step 1, the end segment TF of the separator NS is oriented according to a deviation angle β equal to 0°.

[0429] The end segment TF is measured immediately downstream of the last contact point between roller R2b and separator NS and immediately upstream of the contact point between the first clamp 52 and separator NS.

[0430] The length of the end segment TF is approximately 12 mm. The first distance D1 is equal to 7 mm, and the second distance D2 is equal to the first distance D1.

[0431] exist Figure 18The diagram also shows a second closed working path P2 made by the combined horizontal-vertical guide 132, which is roughly bilobed in shape (similar to a horizontally placed infinity symbol). The second closed working path P2 has generally straight and vertical lateral segments (as can be seen from the parallel relationship between these parts of the second working path P2 and the vector coordinate system shown, where Z represents the vertical axis).

[0432] Furthermore, in step 1, the driven roller R1 and the two opposing rollers R2a and R2b are in an extended configuration CE. The storage section T is measured from the horizontal diameter of the driven roller R1 to the horizontal diameter of the two opposing rollers R2a and R2b, based on the length of the separating belt NS.

[0433] In step 2, refer to Figure 18 The stacked surface 10 moves simultaneously to the right (corresponding to an increase in coordinate position Y) and upward (corresponding to an increase in coordinate position Z). The separator NS remains held by the second clamp 52 (see example). Figure 5 ).

[0434] At the same time, the two opposing and oppositely rotating rollers R2a and R2b rise vertically via the vertical guide 131 (corresponding to an increase in coordinate position Z), thereby shifting from the extended configuration CE to the configuration CR.

[0435] If possible Figure 18 As shown in Table 1, the deviation angle β increases from 0° to 90°.

[0436] In the example shown Figures 1 to 5 and Figures 7 to 18 A two-dimensional view within the YZ plane is shown.

[0437] Therefore, in this discussion, we will not address the case where the change in position along X would be significant.

[0438] In addition, refer to Figure 6 As can be seen, the displacement of the separator NS along the X axis and thus the displacement of the outlet plane PU along the X axis may cause misalignment and / or twisting of the belt itself, which may affect or impair the effectiveness of the invention itself.

[0439] In step 3 and referring to Figure 16 During pure vertical translation, the opposing and oppositely rotating rollers R2a and R2b have reached a position close to configuration CR, with a deviation angle β approximately equal to 90°, and the stacked surface 10 is located to the right of the two rollers R2a and R2b.

[0440] The separator NS is substantially abutting against the stacked surface 10 and is further blocked by the first clamp 51.

[0441] Still refer to Figure 16 At the end of step 3, the second electrode release assembly 300 has reached the position where the second electrode release assembly 300 faces the stacked surface 10.

[0442] The first distance D1 is approximately 3 mm, and the second distance D2 is approximately 7 mm. The second distance D2 is measured as the minimum distance between any part of the two rollers R2a and R2b and any part of the stacked surface 10.

[0443] In step 4, the "movement pause" begins. As previously mentioned, the following state is achieved: the displacement vectors of the first working paths of the two rollers R2a and R2b are consistent with the displacement vectors of the second working path of the stacked surface 10 in terms of direction, orientation, and magnitude.

[0444] The shift vector is a downward-oriented, purely vertical translation (corresponding to a shift with a negative value only in the Z component), causing the two rollers R2a, R2b and the stacked surface to shift as a whole from the closer configuration CR toward the extended configuration CE. Throughout the entire "movement pause," the deviation angle β remains essentially equal to +90°.

[0445] At the end of step 4, a configuration equal to approximately 6 / 7 of the extended configuration CE is achieved, and the “movement pause” ends, thereby concluding the step of following with minimal proximity and releasing the second foil 301 onto the first folded layer of the separator strip NS of the stacked structure S.

[0446] During step 4, the two rollers R2a, R2b, the stacked surface 10, and the second foil release assembly 300 have moved by the same displacement according to the same displacement vector.

[0447] The first distance D1 and the second distance D2 have the same values ​​as those in step 3.

[0448] In step 5, the stacked surface 10 is shifted downward and to the left in a manner similar to that in step 2 but in the opposite direction. Consecutively, the two rollers R2a and R2b are further translated downward to reach the extended configuration CE.

[0449] In step 5, the deviation angle β decreases from +90° to 0°, thus returning to the same state as in step 1. However, the difference is that at this time, the separator NS is held by the first clamp 51 and the foil 301 has been placed on the first folded layer of the separator NS.

[0450] Steps 6 through 10 represent the left-side mirroring that occurred on the right side during steps 2 through 5, thereby causing the first foil release assembly 200 to interfere.

[0451] Therefore, consistently, at the end of step 10 (the spatial configuration of device 100 is the same as that of step 1), the two separating strips NS will have been folded onto the stacked surface 10, and the two foils, preferably the two electrodes 301, 201 (cathode and anode), will be positioned on the stacked surface 10.

[0452] Clearly, method 500 can continue from step 10 to perform a new step 2 to form the desired stacked structure S.

[0453] More generally, so far, the combination Figure 1 All elements described in the illustrated embodiments can be combined with all possible embodiments provided by the present invention and described above.

[0454] It goes without saying that, in order to meet specific and occasional application needs, those skilled in the art will be able to make other modifications and variations, which still fall within the scope of protection defined by the appended claims.

Claims

1. A stacking apparatus (100) for stacking a separator strip (NS) and foils (201, 301), wherein: - The device (100) includes a feeding unit (20) disposed immediately upstream of the stacking unit (1) and the feeding unit (20) is configured to convey the separator strip (NS) along the feeding path (PA). - The device (100) includes a stacking unit (1), the stacking unit (1) includes a stacking surface (10), the stacking surface (10) being configured to receive the separator strip (NS) and the foils (201, 301) to form a stacked structure (S) of the separator strip (NS); The device includes an actuation unit (130) configured to move the stacked surface (10) relative to the feeding unit (20) along a second working path (P2) in a continuous motion, the second working path (P2) defining a closed curve.

2. The stacking device (100) according to the preceding claim, wherein: - The feeding unit (20) includes an outlet section (22) of the separation strip (NS) that intersects with the reference plane (PR); - The second path (P2) crosses the reference plane (PR).

3. The device (100) according to the preceding claim, wherein: - The feeding unit (20) includes a departure orientation control device (R2), which is disposed immediately upstream of the stacking unit (1) and defines the departure reference direction (DRU) of the separator (NS); - The reference plane (PR) is parallel to the departure reference direction (DRU).

4. The device (100) according to claim 2 or 3, wherein, The reference plane (PR) is the plane of symmetry of the second working path (P2).

5. The device (100) according to claim 2, 3 or 4, wherein, The second working path (P2) defines a curve with two segments that intersect at a point located on the reference plane (PR). Preferably, the second working path (P2) has a generally bilobal shape.

6. The stacking device (100) according to any one of claims 3 to 5, wherein: - The stacking unit (1) includes a first blocking device (51) and / or a second blocking device (52), the first blocking device (51) and / or the second blocking device (52) being configured to selectively constrain the separator (NS) at a first constraint position (PV1) and / or a second constraint position (PV2) near the stacking surface (10) to form the stacking structure (S) of the separator (NS); - The departure orientation control device (R2) is configured to define an end segment (TF) of the separation strip (NS), the end segment (TF) being included between the departure orientation control device (R2) and an adjacent first blocking device (51) or second blocking device (52). - The manipulation unit (130) includes a second manipulation device (132) configured to move the stacked surface (10) relative to the feeding unit (20) between a first stacking position (Pip1) and a second stacking position (Pip2): o The first stacking position (Pip1) defines the first end segment (TF1) of the separator (NS), in which the layers of the stacked structure (S) are constrained to the stacking unit (1) by the first blocking device (51) and / or the second blocking device (52). The second stacking position (Pip2) is different from the first stacking position (Pip1). The second stacking position (Pip2) defines the second end segment (TF2) of the separator (NS), which has a length substantially the same as that of the first end segment (TF1). In the second stacking position (Pip2), the additional layers of the stacked structure (S) are constrained to the stacking unit (1) relative to the first stacking position (Pip1) by the first blocking device (51) and / or the second blocking device (52).

7. The device (100) according to the preceding claim, wherein, The second operating device (132) is configured to move the stacked surface (10) relative to the feeding unit (20) such that, along the second working path (P2) between the first stacked position (Pip1) and the second stacked position (Pip2), the length (L) of the first end segment (TF1) increases by an amount approximately equal to the distance between the first blocking device (51) and the second blocking device (52).

8. The device (100) according to claim 6 or 7, wherein: - The manipulation unit (130) includes a first manipulation device (131) of the departure orientation control device (R2), the first manipulation device (131) being configured to shift the departure orientation control device (R2) along a first working path (P1); - When the stacked surface (10) is in the first stacked position (Pip1) or the second stacked position (Pip2), the departure orientation control device (R2) is in the same position relative to the feeding unit (20).

9. The device (100) according to any one of claims 6 to 8, wherein, For each complete shift between the first overlay position (Pip1) and the second overlay position (Pip2), the second working path (P2) includes at least one receiving segment (TR) parallel to the departure reference direction (DRU).

10. The device (100) according to any one of claims 8 to 9, wherein: - The feeding unit (20) includes a first orientation control device (R1) positioned upstream of the departure orientation control device (R2) along the feeding path (PA) to define a storage section (T) of the separation band (NS) between the first orientation control device (R1) and the departure orientation control device (R2). - The first actuation device (131) of the departure orientation control device (R2) is configured to shift the departure orientation control device (R2) along the first working path (P1); - The first actuation device (131) is configured to shift the departure orientation control device (R2) between the following proximity configuration (CR) and extension configuration (CE): In the proximity configuration (CR), the departure orientation control device (R2) is spaced apart from the first orientation control device (R1) by a minimum distance, the minimum distance being measured based on the length of the separator (NS) when the separator (NS) is between the first orientation control device (R1) and the departure orientation control device (R2); and In the extended configuration (CE), the departure orientation control device (R2) is spaced apart from the first orientation control device (R1) by a maximum distance, the maximum distance being measured based on the length of the separator (NS) when the separator (NS) is located between the first orientation control device (R1) and the departure orientation control device (R2). o Thus, in all spatial configurations between the proximity configuration (CR) and the extension configuration (CE) that the separator (NS) can present at the storage section (T), the same angular orientation is maintained, and only the portion of the separator (NS) downstream of the departure orientation control device (R2) is the end segment (TF): the angular orientation of the portion changes as the stacked structure (S) of the separator (NS) is being formed; and the manipulation unit (130) is configured to cause the departure orientation control device (R2) to follow the stacked surface (10) in displacement according to at least one displacement component.

11. The device (100) according to the preceding claim, wherein: - The end segment (TF) is oriented according to a deviation direction (DD), which is tilted relative to the departure reference direction (DRU) by a deviation angle (β) that varies according to the second working path (P2); - The first operating device (131) is configured such that: o By shifting the departure orientation control device (R2) from the extended configuration (CE) to the approach configuration (CR), the absolute value of the deviation angle (β) changes from essentially 0° to essentially 90°; o By shifting the departure orientation control device (R2) from the proximity configuration (CR) to the extension configuration (CE), the absolute value of the deviation angle (β) varies between approximately 80° and approximately 100°, preferably, the absolute value of the deviation angle (β) remains approximately constant at 90°.

12. The device (100) according to any one of claims 8 to 11, wherein: - The device (100) includes a first foil release assembly (200) and / or a second foil release assembly (300); - The first foil release assembly (200) and / or the second foil release assembly (300) respectively include a first shifting device (210) and / or a second shifting device (310), the first shifting device (210) and / or the second shifting device (310) being configured to respectively shift the first foil release assembly (200) and / or the second foil release assembly (300) according to a proximity movement (Mac), the proximity movement (Mac) relative to the stacking surface (10) being configured to shift the first foil (201) or the second foil (301) to a minimum release distance (DmR) spaced apart from the constrained portion of the separator (NS) located on the stacking surface (10), the proximity movement (Mac) being configured to: generate a state of substantially zero relative velocity between the first foil release assembly (200) and / or the second foil release assembly (300) and the stacking surface (10) during the receiving segment (TR).

13. A method (500) for forming a stacked structure (S) of separators (NS), preferably, the stacked structure (S) of the separators (NS) is used for an electrochemical cell intended to produce a battery, the method (500) comprising: - Arrange a feeding unit (20), which is located immediately upstream of the stacking unit (1) and is configured to feed the separator strip (NS) along the feeding path (PA); - The stacking unit (1) is arranged, the stacking unit (1) including a movable stacking surface (10) configured to cause the separator (NS) to stack itself; - Arrange an operating unit (130) configured to move the stacked surface (10) relative to the feeding unit (20) along a second working path (P2) in a continuous motion, the second working path (P2) defining a closed curve; - Constrain the first layer of the separator (NS) onto the stacked surface (10); - The stacked structure (S) is formed by constraining at least one additional layer of the separator (NS) onto the stacked surface (10) and moving the stacked surface (10) in a continuous motion relative to the feeding unit (20) according to the working path (P2).

14. The method (500) according to the preceding claim, wherein, The separator strip (NS) is fed continuously, preferably at a substantially constant feeding rate.

15. A stacking apparatus (100) for stacking a separator strip (NS) and foils (201, 301), the apparatus (100) comprising: - Stacking unit (1), the stacking unit (1) includes: o Overlapping surface (10), the overlapping surface (10) being configured to receive the separator strip (NS) and the foil; - A feeding unit (20) configured to feed the separator strip (NS) along a feeding path (PA), wherein: o The feeding unit (20) includes a departure orientation control device (R2), which is directly disposed upstream of the stacking unit (10); -A control unit (130) comprising a first control device (131) and a second control device (132), the first control device (131) being configured to move the departure orientation control device (R2) along a first working path (P1) while the stacked surface (10) is moved, and the second control device (132) being configured to move the stacked surface (10) along a second working path (P2), the first control device (131) and the second control device (132) being configured to move the departure orientation control device (R2) and the stacked surface (10) in a manner of mutual motion that translates substantially only in a direction parallel to the stacked surface (10) by guiding the separator (NS) to abut against the stacked surface or to overlap the portion of the separator (NS) constrained to be parallel to the stacked surface (10).

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