Battery monomer manufacturing method and battery processing equipment

Abstract

The invention relates to the technical field of batteries, in particular to a manufacturing method of a battery monomer and battery processing equipment. In the embodiment of the invention, at least one of the two electrode pieces located on the outermost side in the electrode assembly is configured as the target electrode piece, and the second film layer on the target electrode piece is removed in the process of forming the electrode assembly. Therefore, the stress condition of the target pole piece can be improved by virtue of the first film layer and the second film layer, so that the laminating and pressing quality is improved, the mechanical property of the battery is improved, the safety risk is reduced, the first film layer can be manufactured to be thinner, the energy density is improved, and the battery performance is improved. Therefore, the electrical performance of the battery is improved, and the surface quality of the target pole piece can be improved. In addition, compared with the mode that active layers are arranged on the two sides of the current collector of the target pole piece, the manufacturing cost is reduced. Therefore, the performance of the battery is improved on the whole, and the manufacturing cost is reduced at the same time.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a method for manufacturing a battery cell and battery processing equipment. Background Art

[0002] At present, the electrode assembly in the battery is mainly made by lamination process or winding process, and the laminated electrode assembly has been widely used due to its many advantages, such as high rate, high energy density, etc. However, the performance of the battery using the laminated electrode assembly needs to be further improved. Summary of the invention

[0003] Based on this, the present application provides a method for manufacturing a battery cell and a battery processing device to improve the performance of the battery.

[0004] In a first aspect, the present application provides a method for manufacturing a battery cell, comprising:

[0005] Providing a plurality of pole pieces; the plurality of pole pieces include a target pole piece, the target pole piece includes an active layer, a current collector, a first film layer and a second film layer stacked in sequence;

[0006] A plurality of pole pieces are stacked, pressed, and the second film layer is removed to form an electrode assembly; in the electrode assembly, at least one of the two outermost pole pieces is a target pole piece from which the second film layer is removed, and the active layer of the target pole piece is arranged toward an adjacent pole piece;

[0007] A housing is provided, and the electrode assembly is installed in a receiving cavity of the housing to form a battery cell.

[0008] In the technical solution of the embodiment of the present application, at least one of the two outermost pole pieces in the electrode assembly is configured as a target pole piece, and the second film layer on the target pole piece is removed during the process of forming the electrode assembly. In this process, since the active layer is set on one side of the current collector in the target pole piece, and the first film layer and the second film layer are set on the other side of the current collector, compared with the method of setting the active layer on one side of the current collector of the target pole piece, it is beneficial to use the first film layer and the second film layer to improve the stress of the target pole piece, thereby improving the quality of stacking and pressing, thereby improving the mechanical properties of the battery and reducing safety risks. At the same time, since the second film layer can be removed from the first film layer, not only can the first film layer be made thinner, which is beneficial to improve the energy density, thereby improving the electrical performance of the battery, but also can improve the surface quality of the target pole piece. In addition, compared with the method of setting the active layer on both sides of the current collector of the target pole piece, it is beneficial to reduce the production cost. As a result, the performance of the battery is improved as a whole while reducing the production cost.

[0009] In some embodiments, providing a plurality of pole pieces includes providing a target pole piece, and providing the target pole piece includes:

[0010] A first strip and a second strip are provided; wherein the first strip is configured as a pole piece strip, the second strip is configured as a film layer group strip, the pole piece strip includes a current collector strip and an initial active layer disposed on one side of the current collector strip, and the film layer group strip includes an initial first film layer and an initial second film layer stacked; or, the first strip is configured as a pole piece strip, the second strip is configured as a film layer strip for forming an initial second film layer, the pole piece strip includes a current collector strip, an initial active layer disposed on one side of the current collector strip, and an initial first film layer disposed on a side of the current collector strip away from the initial active layer;

[0011] attaching a second tape to the first tape to form a stacked arrangement of an initial active layer, a current collector tape, an initial first membrane layer, and an initial second membrane layer;

[0012] The attached first and second strips are cut into pieces to form target pole pieces.

[0013] Since the attached first and second strips include the initial first film layer and the initial second film layer before the target pole piece is cut, the initial first film layer and the initial second film layer can provide support for the current collector strip, thereby improving the curling or warping of the target pole piece when the target pole piece is cut, and further improving the quality of lamination and pressing. In this process, by using the initial first film layer and the initial second film layer as the second strip, the material of the initial first film layer and the initial second film layer can be configured according to different performance requirements, thereby improving the performance of the target pole piece. By using the initial first film layer, the current collector strip and the initial active layer as the first strip (i.e., the pole piece strip), and the initial second film layer as the second strip, the pole piece strip has a certain integrity before being attached to the second strip, and the pole piece strip can be protected by the initial first film layer. In addition, by providing the first strip and the second strip, it is only necessary to attach the first strip to the second strip during the production process, which is conducive to improving production efficiency.

[0014] In some embodiments, attaching the second tape to the first tape to form a stacked arrangement of an initial active layer, a current collector tape, an initial first film layer, and an initial second film layer comprises:

[0015] Performing a glue spraying process on at least one side where the first tape material and the second tape material are connected to each other, so as to form an adhesive layer on at least one side where the first tape material and the second tape material are connected to each other;

[0016] The second tape is adhered to the first tape by the adhesive layer.

[0017] In this way, since the adhesive layer has a certain adhesive force, the first tape and the second tape can be relatively fixed, which is conducive to the subsequent slitting and processing of the attached first tape and the second tape. At the same time, compared with other attachment methods (such as hot pressing, etc.), it is also easy to manufacture, and when the second tape is configured as a film layer tape for forming an initial second film layer, it is also conducive to the subsequent removal of the second film layer on the target electrode.

[0018] In some embodiments, providing a target pole piece further comprises:

[0019] The tension of the first belt material is adjusted by an adjusting mechanism; along the conveying direction of the first belt material, the adjusting mechanism is located upstream of an initial position where the first belt material is attached to the second belt material.

[0020] In this way, by controlling the tension of the first strip, it is beneficial to improve the uniformity of force on the first strip and the second strip when they are attached, reduce the risk of wrinkles, bubbles or local loose fit, and thus help improve the electrical performance and safety performance of the battery.

[0021] In some embodiments, attaching the second tape to the first tape includes:

[0022] The first tape material and the second tape material are rolled by a roller mechanism so that the second tape material is attached to the first tape material.

[0023] In this way, the pressure applied by the pressure roller mechanism is not only conducive to making the first strip material closely contact with the second strip material, but also can provide more uniform pressure in the width direction of the strip material, thereby improving the attachment effect, which is conducive to improving the pressing effect in the subsequent pressing process step, and then improving the battery performance and the structural stability of the battery.

[0024] In some embodiments, the pressure roller mechanism includes multiple pressure roller units, and the multiple pressure roller units are arranged along the conveying direction of the first material strip; wherein at least one of the multiple pressure roller units is in use; and / or the pressure roller unit is configured to provide roller pressure, and the roller pressures corresponding to the multiple pressure roller units have at least two sizes of roller pressures.

[0025] By providing multiple pressing roller units and making at least one pressing roller unit in use, one or multiple pressing can be selectively performed according to the strip material. By providing multiple pressing roller units and having at least two sizes of roller pressure, the roller pressure can be configured according to the specific characteristics of the strip material. In this way, not only can the attachment effect be improved, but also the production cost can be controlled.

[0026] In some embodiments, a plurality of electrode sheets are stacked, pressed, and the second film layer is removed to form an electrode assembly, including:

[0027] A plurality of pole pieces are stacked to form a first assembly; in the first assembly, at least one of the two outermost pole pieces is a target pole piece, and an active layer of the target pole piece is arranged toward an adjacent pole piece;

[0028] Performing a lamination process on the first component to form a second component;

[0029] The second film layer in the second assembly is removed to form an electrode assembly.

[0030] In this way, by removing the second film layer after the lamination process, the second film layer can be used to improve the structural performance of the first component and protect the first component during the lamination process, which is beneficial to improving the lamination effect.

[0031] In some embodiments, a plurality of electrode sheets are stacked, pressed, and the second film layer is removed to form an electrode assembly, including:

[0032] removing the second film layer on the target pole piece;

[0033] Multiple pole pieces are stacked and pressed together to form an electrode assembly.

[0034] Thus, by removing the second film layer before the lamination process, the operation of removing the second film layer is facilitated.

[0035] In some embodiments, the force between the first film layer and the current collector is greater than the force between the second film layer and the first film layer.

[0036] Thus, when the second film layer needs to be removed, the smaller force between the second film layer and the first film layer makes the removal process easier. This not only reduces the risk of damage to the first film layer and the current collector, but also simplifies the operation process.

[0037] In some embodiments, the first film layer is bonded to the current collector, and the second film layer is bonded to the first film layer; the bonding force between the first film layer and the current collector is greater than the bonding force between the second film layer and the first film layer.

[0038] In this way, since the first film layer, the current collector and the second film layer are connected by bonding, it is not only convenient to remove the second film layer, but also the operation process can be simplified and the production efficiency can be improved.

[0039] In some embodiments, the sum of the thickness of the first film layer and the thickness of the second film layer is greater than or equal to 0.1 mm.

[0040] This is beneficial for providing certain support performance for the current collector of the target electrode, thereby improving the subsequent pressing quality.

[0041] In some embodiments, the thickness of the first film layer is less than or equal to 0.05 mm; and / or the thickness of the second film layer is greater than or equal to 0.05 mm.

[0042] In this way, by controlling the thickness of the first film layer, it is not only possible to provide a certain support performance for the current collector of the target pole piece, but also to make the thickness of the formed electrode assembly smaller while facilitating production, which is beneficial to improving the energy density of the battery. By controlling the thickness of the second film layer, it is not only possible to further improve the support effect for the current collector of the target pole piece, but also to make the thickness of the first film layer smaller while facilitating production, which is beneficial to improving the energy density of the battery.

[0043] In some embodiments, the orthographic projection of the first film layer on the reference plane is within the range of the orthographic projection of the second film layer on the reference plane; the reference plane is perpendicular to the thickness direction of the target pole piece; and there is a gap between at least a portion of the outer contour of the orthographic projection of the first film layer on the reference plane and the outer contour of the orthographic projection of the second film layer on the reference plane.

[0044] In this way, since the second film layer is disposed beyond the first film layer, it is advantageous to remove the second film layer by means of the portion of the second film layer that exceeds the first film layer in the step of removing the second film layer.

[0045] In some embodiments, along the width direction of the target pole piece, the size of the first film layer is smaller than the size of the second film layer; the width direction of the target pole piece and the thickness direction of the target pole piece are perpendicular to each other.

[0046] In this way, the second film layer is arranged beyond the first film layer in the width direction of the target electrode. This method facilitates the formation of a structure in which the second film layer is arranged beyond the first film layer, making the overall process simpler.

[0047] In some embodiments, the material of the first film layer includes at least one of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, metal, and stainless steel; and / or, the material of the second film layer includes at least one of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, metal, and stainless steel.

[0048] Thus, by configuring the material of the first film layer, the first film layer has a certain mechanical strength and a more stable structure, which is conducive to providing support. By configuring the material of the second film layer, the second film layer has a certain mechanical strength and a more stable structure, which is conducive to providing support and facilitating removal.

[0049] In some embodiments, the first film layer is configured as a single-layer structure or a multi-layer structure; and / or the second film layer is configured as a single-layer structure or a multi-layer structure.

[0050] In this way, the first film layer and the second film layer of a single-layer structure or a multi-layer structure can be set according to different usage requirements. When the corresponding film layer is a single-layer structure, the production process of the film layer can be simplified. When the corresponding film layer is a multi-layer structure, the multi-layer structure can be used to flexibly control the performance of the film layer, thereby further meeting different usage requirements.

[0051] In the second aspect, the present application provides a battery processing equipment, including: a providing device, configured to provide multiple pole sheets, the multiple pole sheets include a target pole sheet, the target pole sheet includes an active layer, a current collector, a first film layer and a second film layer stacked in sequence; a forming device and a removing device, the forming device is configured to stack and press the multiple pole sheets, and the removing device is configured to remove the second film layer on the target pole sheet to form an electrode assembly; in the electrode assembly, at least one of the two outermost pole sheets is the target pole sheet, and the active layer of the target pole sheet is arranged toward the adjacent pole sheet; and a shelling device, configured to load the electrode assembly into the accommodating cavity of the shell.

[0052] By providing a device to provide multiple pole pieces including a target pole piece, since an active layer is set on one side of the current collector in the target pole piece, and a first film layer and a second film layer are set on the other side of the current collector, compared with the method of setting the active layer on one side of the current collector of the target pole piece, it is beneficial to use the first film layer and the second film layer to improve the stress condition of the target pole piece, thereby improving the quality of the electrode assembly formed by stacking and pressing of the molding device, thereby improving the mechanical properties of the battery and reducing safety risks. At the same time, since the removal device is used to remove the second film layer, the first film layer can be made thinner, which is beneficial to improve the energy density and thus improve the electrical performance of the battery. In addition, compared with the method of setting the active layer on both sides of the current collector of the target pole piece, it is beneficial to reduce the production cost. As a result, the performance of the battery is improved as a whole while reducing the production cost.

[0053] In some embodiments, the providing device includes a first providing mechanism; the first providing mechanism includes: a first unwinding mechanism and a second unwinding mechanism, the first unwinding mechanism is configured to provide a first tape material, and the second unwinding mechanism is configured to provide a second tape material; an attachment mechanism, located downstream of the first unwinding mechanism and the second unwinding mechanism; the attachment mechanism is configured to attach the first tape material and the second tape material; and a cutting mechanism, located downstream of the attachment mechanism; the cutting mechanism is configured to slitting the attached first tape material and the second tape material to form a target pole piece. Among them, the first strip is configured as a pole piece strip, the second strip is configured as a film layer group strip, the pole piece strip includes a current collector strip and an initial active layer arranged on one side of the current collector strip, and the film layer group strip includes an initial first film layer and an initial second film layer stacked together; or, the first strip is configured as a pole piece strip, the second strip is configured as a film layer strip for forming an initial second film layer, the pole piece strip includes a current collector strip, an initial active layer arranged on one side of the current collector strip, and an initial first film layer arranged on a side of the current collector strip away from the initial active layer.

[0054] By setting the first unwinding mechanism and the second unwinding mechanism, the first and second strips can be continuously fed. At the same time, since the attachment mechanism is located downstream of the first and second unwinding mechanisms, and the cutting mechanism is located downstream of the attachment mechanism, a continuous production arrangement is formed, which is conducive to improving production efficiency. The advantages brought by the configuration of the first and second strips can be referred to the advantages illustrated in some of the aforementioned embodiments, which will not be repeated here.

[0055] In some embodiments, the first providing mechanism further includes a glue spraying mechanism; the glue spraying mechanism is located upstream of the attachment mechanism; the glue spraying mechanism is configured to perform glue spraying on at least one side where the first tape and the second tape are attached to each other.

[0056] By providing a glue spraying mechanism, an adhesive layer can be formed on at least one surface of the first and second strips where the first and second strips are attached to each other before the first and second strips are attached, which helps to improve the firmness of the attachment of the first and second strips during attachment. At the same time, since the glue spraying mechanism is located upstream of the attachment mechanism, it is convenient to form a continuous manufacturing process with the subsequent attachment mechanism, thereby improving the manufacturing efficiency.

[0057] In some embodiments, the first providing mechanism further comprises an adjusting mechanism; the adjusting mechanism is located upstream of the attaching mechanism; and the adjusting mechanism is configured to adjust the tension of the first tape.

[0058] Before attachment, setting an adjustment mechanism to adjust the tension of the first strip of material is beneficial to improving the force uniformity of the first strip of material and the second strip of material when they are attached, reducing the risk of wrinkles, bubbles or local loose fit, thereby helping to improve the electrical performance and safety performance of the battery.

[0059] In some embodiments, the attachment mechanism includes a pressing roller mechanism; the pressing roller mechanism is located downstream of the first unwinding mechanism and the second unwinding mechanism, and the pressing roller mechanism is configured to roll the first and second tape materials.

[0060] In this way, the pressure applied by the pressure roller mechanism is not only conducive to making the first strip material closely contact with the second strip material, but also can provide more uniform pressure in the width direction of the strip material, thereby improving the attachment effect, which is conducive to improving the pressing effect in the subsequent pressing process step, and then improving the battery performance and the structural stability of the battery.

[0061] In some embodiments, the pressing roller mechanism includes a plurality of pressing roller units, and the plurality of pressing roller units are arranged along the conveying direction of the first strip material. At least one of the plurality of pressing roller units is in use; and / or the pressing roller unit is configured to provide roller pressure, and the roller pressures corresponding to the plurality of pressing roller units have at least two sizes of roller pressure.

[0062] This can be understood by referring to the advantages of the multiple pressing roller units illustrated in some of the aforementioned embodiments, and will not be elaborated here.

[0063] In some embodiments, the first providing mechanism also includes a correcting mechanism, which is located downstream of the attachment mechanism and upstream of the cutting mechanism, and the correcting mechanism is configured to correct the first and second webs after attachment; and / or, the first providing mechanism also includes an adjusting mechanism, which is located downstream of the attachment mechanism and upstream of the cutting mechanism, and the adjusting mechanism is configured to adjust the conveying speed of the first and second webs after attachment.

[0064] The attached strip may be displaced due to deviations during the attachment process or interference during the transmission process. By setting up a deviation correction mechanism, the aforementioned positional displacement can be reduced, which is beneficial for the subsequent cutting of target pole pieces that meet the size requirements, and thus is beneficial for improving the overall performance and consistency of the battery. Since the operating speeds of each process may differ, the conveying speed of the attached strip can be flexibly adjusted by setting up an adjustment mechanism, so that the attached first strip and the second strip enter the cutting mechanism at the required speed, which is beneficial for the cutting mechanism to cut the attached first strip and the second strip, and thus can improve the cutting quality.

[0065] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the embodiments below. The accompanying drawings are only for the purpose of illustrating the embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0067] Figure 1 A schematic diagram of the structure of a vehicle in some embodiments of the present application;

[0068] Figure 2 is a schematic diagram of the exploded structure of a battery device in some embodiments of the present application;

[0069] Figure 3 A schematic diagram of the exploded structure of a battery cell in some embodiments of the present application;

[0070] Figure 4 A schematic diagram of a process for manufacturing a battery cell in some embodiments of the present application;

[0071] Figure 5 A schematic diagram of the structure of a target pole piece in some embodiments of the present application;

[0072] Figure 6 This is a schematic cross-sectional view of an electrode assembly in some embodiments of the present application;

[0073] Figure 7 A schematic diagram of a process for providing a target pole piece in some embodiments of the present application;

[0074] Figure 8 This is a schematic side view of the structure of the first strip material in some embodiments of the present application;

[0075] Fig. 9 This is a schematic side view of the structure of the second strip material in some embodiments of the present application;

[0076] Fig.10 It is a schematic diagram of the side view structure of the first strip material in other embodiments of the present application;

[0077] Fig.11 It is a schematic side view of the structure of the second strip material in some other embodiments of the present application;

[0078] Fig.12 This is a flowchart of step S111b in some embodiments of the present application;

[0079] Fig.13 Schematic diagram of the process of step S1 in some embodiments of the present application;

[0080] Fig.14 This is a flow chart of step SJ in some embodiments of the present application;

[0081] Fig.15 This is a flowchart of step S120 in some embodiments of the present application;

[0082] Fig.16 A flowchart of step S120 in some other embodiments of the present application;

[0083] Fig.17 This is a schematic diagram of the structure of the first film layer and the second film layer cooperating in some embodiments of the present application;

[0084] Fig.18 It is a schematic diagram of the structure of the battery processing equipment in some embodiments of the present application;

[0085] Fig.19 This is a schematic diagram of the structure of the first providing mechanism in some embodiments of the present application.

[0086] Description of reference numerals:

[0087] Vehicle 1;

[0088] Battery device 10, controller 20, motor 30;

[0089] Battery cell 100, housing 110, shell 111, end cap 112, electrode terminal et, electrode assembly 120, pole piece 121, target pole piece T, active layer H, current collector J, first film layer M1, second film layer M2, separator 122;

[0090] Box body 200, first box body part 210, second box body part 220;

[0091] The first strip of material D1, the second strip of material D2;

[0092] Pole piece strip D1a, current collector strip D11a, initial active layer D12a, film layer group strip D2a, initial first film layer D21a, initial second film layer D22a;

[0093] Pole piece material D1b, current collector material D11b, initial active layer D12b, initial first film layer D13b, film layer material D2b;

[0094] A first thickness d1, a second thickness d2;

[0095] Battery processing equipment 1000, providing device 1100, first providing mechanism 1110, first unwinding mechanism 1111, second unwinding mechanism 1112, attaching mechanism 1113, pressing roller mechanism G, pressing roller unit G1, cutting mechanism 1114, glue spraying mechanism 1115, regulating mechanism 1116, correcting mechanism 1117, adjusting mechanism 1118, forming device 1200, removing device 1300, shelling device 1400, conveying roller S;

[0096] Thickness direction Z, width direction W, length direction L;

[0097] Steps S110, S111a, S111b, SG, SH, SI, S111c, S120, S121a, S122a, S123a, S121b, S122b, S130. DETAILED DESCRIPTION

[0098] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0099] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0100] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0101] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0102] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0103] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0104] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0105] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0106] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0107] The electrode assembly in the battery is mainly made by lamination or winding process, and is widely used due to its many advantages, such as high rate, high energy density, etc. However, the performance of the battery using the laminated electrode assembly needs to be further improved.

[0108] Based on this, in order to improve the performance of batteries using laminated electrode assemblies, the embodiments of the present application provide a method for manufacturing a battery cell and a battery processing device, which improves the quality of the electrode assembly by providing support force to at least one of the outermost pole pieces of the electrode assembly, thereby improving the performance of the battery. Specifically, by providing a support structure on the outer side of at least one of the outermost pole pieces of the electrode assembly to provide support force to the pole piece, and allowing part of the support structure to be removed, not only can the force condition of the pole piece be improved, but also the molding quality of the electrode assembly can be improved, thereby improving the battery performance as a whole.

[0109] The battery cell produced by the manufacturing method of the battery cell disclosed in the embodiment of the present application can be used in, but not limited to, electrical equipment such as vehicles, ships or aircraft. The power supply system of the electrical equipment can be composed of the battery cell disclosed in the present application and other components, which is conducive to improving battery performance.

[0110] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device is a device that uses electric energy as an energy source and realizes corresponding functions by consuming electric energy. Exemplarily, the electric device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0111] The electric device of the embodiment of the present application may include a device body and a power supply device, the power supply device is used to supply power to the device body, and the power supply device may include a battery cell or a battery pack. The device body refers to a main structure that consumes electric energy to achieve corresponding functions. For example, the electric device may be a mobile phone, the device body is the part that can achieve functions such as communication, and the battery cell or battery pack is used to supply power to the part that can achieve functions such as communication. For example, the electric device may be a car, the device body is the part that can be used for people to sit and can be driven on the road, and the battery cell or battery pack is used to supply power to the part that can be used for people to sit and can be driven on the road. The power supply device refers to a device that can output electric energy. Exemplarily, electric energy can be output by a battery pack composed of battery cells.

[0112] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0113] Please refer to Figure 1 , Figure 1Schematic diagram of the structure of vehicle 1 in some embodiments of the present application. Vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is provided inside the vehicle 1, and the battery device 10 can be provided at the bottom, head or tail of the vehicle 1. The battery device 10 can be used to power the vehicle 1. For example, the battery device 10 can be used as an operating power source for the vehicle 1. The vehicle 1 can also include a controller 20 and a motor 30. The controller 20 is used to control the battery device 10 to power the motor 30, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0114] In some embodiments of the present application, the battery device 10 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0115] In order to meet different power requirements, the battery device 10 may include a plurality of battery cells 100, where a battery cell 100 refers to the smallest unit that constitutes a battery module or a battery pack. A plurality of battery cells 100 can be connected in series and / or in parallel via electrode terminals et for use in various applications. The batteries mentioned in the present application include battery modules or battery packs. Among them, a plurality of battery cells 100 can be connected in series, in parallel, or in mixed connection, where mixed connection refers to a mixture of series and parallel connection. The battery device 10 may also be referred to as a battery pack. In the embodiments of the present application, a plurality of battery cells 100 may directly constitute a battery pack, or may first constitute a battery module, which may then constitute a battery pack.

[0116] Please refer to Figure 2 , Figure 2 It is a schematic diagram of the exploded structure of the battery device 10 in some embodiments of the present application. Figure 2 In the embodiment, the battery device 10 may include a plurality of battery modules and a case 200, and the plurality of battery modules are contained inside the case 200. The case 200 is used to contain the battery cells 100 to prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells 100. The case 200 may be a simple three-dimensional structure such as a single cuboid, cylinder or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres, which is not limited in the embodiments of the present application. The material of the case 200 may be an alloy material such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin, which is not limited in the embodiments of the present application.

[0117] In some embodiments, the box 200 may include a first box portion 210 and a second box portion 220, the first box portion 210 and the second box portion 220 cover each other, and the first box portion 210 and the second box portion 220 jointly define a space for accommodating the battery cell 100. The second box portion 220 may be a hollow structure with one end open, the first box portion 210 may be a plate-like structure, and the first box portion 210 covers the open side of the second box portion 220, so that the first box portion 210 and the second box portion 220 jointly define a space for accommodating the battery cell 100. The first box portion 210 and the second box portion 220 may also be hollow structures with one side open, and the open side of the first box portion 210 covers the open side of the second box portion 220.

[0118] The battery module may include a plurality of battery cells 100, and the plurality of battery cells 100 may be first connected in series or in parallel or in a mixed connection to form a battery module, and the plurality of battery modules may then be connected in series or in parallel or in a mixed connection to form a battery. In the present application, the battery cell 100 may include a lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., which is not limited in the embodiments of the present application. The battery cell 100 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cell 100 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. However, for the sake of simplicity of description, the following embodiments are all described using a cubic square battery cell as an example.

[0119] Please refer to Figure 3 , Figure 3 1 is a schematic diagram of the exploded structure of a battery cell 100 in some embodiments of the present application. The battery cell 100 refers to the smallest unit constituting the battery device 10. Figure 3 The battery cell 100 includes a housing 110 , an electrode assembly 120 and other functional components.

[0120] The housing 110 is a component for forming the internal environment of the battery cell 100. The housing 110 may include a shell 111 and an end cap 112. The shell 111 is a component for cooperating with the end cap 112 to form the internal environment of the battery cell 100. Among them, the formed internal environment can be used to accommodate the electrode assembly 120, the electrolyte (not shown in the figure) and other components. The shell 111 and the end cap 112 can be independent components, and an opening can be set on the shell 111, and the end cap 112 is covered at the opening to form the internal environment of the battery cell 100. Without limitation, the end cap 112 and the shell 111 can also be integrated. Specifically, the end cap 112 and the shell 111 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 111, the end cap 112 is covered with the shell 111. The shell 111 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 111 can be determined according to the specific shape and size of the electrode assembly 120. The housing 111 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present embodiment of the application does not impose any special restrictions on this. The opening of the housing 111 can be located at the side or bottom of the housing 111, and the present embodiment of the application does not impose any restrictions on this.

[0121] The end cap 112 refers to a component that can be covered on the opening of the shell 111 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the end cap 112 can be adapted to the shape of the shell 111 to match the shell 111. For example, the end cap 112 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 112 is not easy to deform when it is squeezed and collided, so that the battery cell 100 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals et can be provided on the end cap 112. The electrode terminal et can be used to electrically connect to the electrode assembly 120 for outputting or inputting electrical energy of the battery cell 100. In some embodiments, the end cap 112 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold. In some embodiments, the end cap 112 can also be provided with a liquid injection hole for injecting electrolyte into the interior of the battery cell 100. Of course, the electrode terminal et and the injection hole can also be provided on the shell 111. The material of the end cap 112 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap 112, and the insulating member can be used to isolate the electrical connection components in the shell 111 from the end cap 112 to reduce the risk of short circuit. Exemplarily, the material of the insulating member can be plastic, rubber, etc. In some embodiments, a pressure relief mechanism can also be provided on the shell 111 and / or the end cap 112. The pressure relief mechanism is used to release the internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold value to improve the safety performance of the battery cell 100. The threshold design varies according to different design requirements. The threshold may depend on one or more materials in the electrode assembly 120 and the isolation member in the battery cell 100. The pressure relief mechanism may take the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and may specifically adopt a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell 100 reaches a threshold value, the pressure relief mechanism executes an action or a weak structure provided in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0122] The electrode assembly 120 is a component in the battery cell 100 where an electrochemical reaction occurs. One or more electrode assemblies 120 may be included in the housing 110. The electrode assembly 120 is mainly formed by stacking positive and negative electrodes, and a separator is usually provided between the positive and negative electrodes. The parts of the positive and negative electrodes with active materials constitute the main body of the electrode assembly 120, and the parts of the positive and negative electrodes without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or at both ends of the main body, may be located at the top of the main body, or may be located at the side wall of the main body, and no specific restrictions are made here. During the charge and discharge process of the battery device 10, the positive active material and the negative active material react with the electrolyte, and the tab is connected to the electrode terminal et to form a current loop. The separator is used to isolate the positive and negative electrodes, and prevent the electrons in the battery cell 100 from passing freely, so that the ions in the electrolyte flow freely between the positive and negative electrodes. The spacer may be a film made of materials such as PE (polyethylene) and PP (polypropylene).

[0123] According to some embodiments of this application, please refer to Figure 4 , Figure 4 The present invention is a flowchart of a method for manufacturing a battery cell in some embodiments of the present invention. A method for manufacturing a battery cell includes:

[0124] Step S110, providing a plurality of pole pieces; the plurality of pole pieces include a target pole piece, and the target pole piece includes an active layer, a current collector, a first film layer, and a second film layer stacked in sequence;

[0125] Step S120, stacking and laminating a plurality of electrode sheets, and removing the second film layer to form an electrode assembly; in the electrode assembly, at least one of the two outermost electrode sheets is a target electrode sheet from which the second film layer is removed, and the active layer of the target electrode sheet is arranged toward the adjacent electrode sheet;

[0126] Step S130: provide a shell, and install the electrode assembly into the receiving cavity of the shell to form a battery cell.

[0127] In step S110, it can be understood that the plurality of electrode pieces also include positive electrode pieces and negative electrode pieces, and the target electrode piece can be a positive electrode piece or a negative electrode piece. The polarity of the target electrode piece is opposite to the polarity of the adjacent electrode piece, and can be configured according to the polarity of the electrode piece adjacent to the target electrode piece, and no specific limitation is made here. Figure 5, the active layer H, the current collector J, the first film layer M1 and the second film layer M2 in the target pole piece T are stacked in sequence. It can be understood that stacking in sequence refers to the relative positional relationship of the active layer H, the current collector J, the first film layer M1 and the second film layer M2 in the target pole piece T, and does not specifically limit the stacking order of the active layer H, the current collector J, the first film layer M1 and the second film layer M2 in the target pole piece T.

[0128] Among them, the current collector is a component used to carry the active layer, and its main function is to collect the current generated by the active layer so as to form a larger current for external output. Depending on the active layer carried, when carrying an active layer made of positive electrode active material, the current collector can be aluminum foil. When carrying an active layer made of negative electrode active material, the current collector can be copper foil. The current collector can be a single-layer component or a composite layer component. When the current collector is a composite layer component, the current collector can include an intermediate layer and two layers of current collecting metal layers stacked on both sides of the intermediate layer, and the active layer is carried on the side of the current collecting metal layer opposite to the intermediate layer. The intermediate layer can be a polymer support layer, specifically a polyethylene support layer, a polypropylene support layer, a polymethyl methacrylate support layer, a polystyrene support layer, and the like.

[0129] The active layer is usually formed by coating a slurry containing active materials on a current collector and then cold pressing. When the active layer is made of positive electrode active materials, the positive electrode active materials may be, for example, lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, nickel cobalt manganese ternary materials, and nickel cobalt aluminum oxide. When the active layer is made of negative electrode active materials, the negative electrode active materials may be, for example, carbon negative electrode materials, tin-based negative electrode materials, lithium-containing transition metal nitride negative electrode materials, alloy negative electrode materials, and nano-scale negative electrode materials.

[0130] The portion of the current collector provided with the active layer and the active layer constitute the aforementioned main body, and the portion of the current collector not provided with the active layer constitutes the aforementioned pole ear (not shown in the figure). The structure of the positive electrode sheet and the negative electrode sheet can be understood with reference to the target electrode sheet. Unlike the target electrode sheet, the positive electrode sheet and the negative electrode sheet do not include the first film layer and the second film layer, and the active layer can be provided on both sides of the current collector of the positive electrode sheet and the negative electrode sheet, which is not specifically limited here.

[0131] In step S120, the step of removing the second film layer can be performed before the multiple pole pieces are stacked, or before the multiple pole pieces are pressed, or after the multiple pole pieces are pressed, and no specific restrictions are made here. The battery cell can be a liquid battery or a solid-state battery, and correspondingly, the process of stacking multiple pole pieces can be controlled according to the state of the electrolyte. For example, when a solid electrolyte is used, the solid electrolyte layer can be provided on the pole piece, or the solid electrolyte layer can be provided on the separator. For another example, when a liquid electrolyte is used, the separator mentioned above can be provided. When a separator is provided, in the process of stacking multiple pole pieces, the step of simultaneously providing the separator between adjacent pole pieces can be included. When a separator is provided, it can be determined whether the separator needs to be provided on the outermost pole piece according to whether the second film layer is removed or not. It can be provided according to the type of battery cell, and no specific restrictions are made here.

[0132] In the process of stacking multiple pole pieces, the general shape of the desired electrode assembly can be initially formed. The pressing process can make the pole pieces in the electrode assembly closely contact each other and reduce the interface gap, which can not only provide a smoother channel for the transmission of ions between the positive and negative electrodes and reduce the resistance of ion migration, but also improve the structural stability of the electrode assembly. In the formed electrode assembly, the two outermost pole pieces can both be the target pole pieces for removing the second film layer, or one of the two outermost pole pieces can be the target pole piece for removing the second film layer, without specific limitation. For example, in combination with reference Figure 5 ,by Figure 6 For example, Figure 6 1 is a schematic diagram of a cross-sectional structure of an electrode assembly 120 in some embodiments of the present application, illustrating a situation where the two outermost pole pieces 121 are both target pole pieces T with the second film layer M2 removed. At this time, the first film layer M1 is located at the outermost side of the electrode assembly 120. Figure 6 The case where the separator 122 is provided is shown in the figure, but the structure of the electrode assembly 120 is certainly not limited thereto. Figure 6 The ellipsis “…” in the figure indicates that there is no limit on the number of pole pieces.

[0133] In step S130, the shell can be understood with reference to the situations illustrated in some of the aforementioned embodiments, which will not be described in detail here.

[0134] Thus, at least one of the two outermost pole pieces in the electrode assembly is configured as the target pole piece, and the second film layer on the target pole piece is removed during the process of forming the electrode assembly. In this process, since the active layer is arranged on one side of the current collector in the target pole piece, and the first film layer and the second film layer are arranged on the other side of the current collector, compared with the method of arranging the active layer on one side of the current collector of the target pole piece, it is beneficial to improve the stress condition of the target pole piece with the help of the first film layer and the second film layer, thereby improving the quality of stacking and pressing, thereby improving the mechanical properties of the battery and reducing safety risks. At the same time, since the second film layer can be removed from the first film layer, not only can the first film layer be made thinner, which is beneficial to improve the energy density, thereby improving the electrical performance of the battery, but also can improve the surface quality of the target pole piece. In addition, compared with the method of arranging the active layer on both sides of the current collector of the target pole piece, it is beneficial to reduce the production cost. Thus, the overall performance of the battery is improved while the production cost is reduced.

[0135] It should be noted that if a related non-removable support structure is set on the target pole piece, it will be difficult to take into account the energy density and support requirements of the battery. If a related removable support structure is set on the target pole piece, there is a risk that the surface of the target pole piece will be damaged due to the removal of the support structure. In the embodiment of the present application, since the support structure is composed of a first film layer and a movable second film layer, the second film layer is arranged on the first film layer, so that the second film layer is not in direct contact with the target pole piece, it is possible to control the material of the first film layer and the second film layer, and the matching method of the first film layer and the second film layer, while taking into account the energy density and support requirements of the battery, the surface quality of the target pole piece can be improved.

[0136] According to some embodiments of this application, please refer to Figure 7 , Figure 7 This is a flow chart of providing a target pole piece in some embodiments of the present application. Providing a plurality of pole pieces includes providing a target pole piece. Providing a target pole piece includes:

[0137] Step S111a, providing a first strip and a second strip; wherein the first strip is configured as a pole piece strip, the second strip is configured as a film layer group strip, the pole piece strip includes a current collector strip and an initial active layer disposed on one side of the current collector strip, and the film layer group strip includes an initial first film layer and an initial second film layer stacked; or, the first strip is configured as a pole piece strip, the second strip is configured as a film layer strip for forming an initial second film layer, the pole piece strip includes a current collector strip, an initial active layer disposed on one side of the current collector strip, and an initial first film layer disposed on a side of the current collector strip away from the initial active layer;

[0138] Step S111b, attaching the second tape to the first tape to form a stacked initial active layer, a current collector tape, an initial first film layer, and an initial second film layer;

[0139] Step S111c, cutting the attached first and second strips to form target pole pieces.

[0140] In step S111a, the first tape and the second tape are usually rolled or tape-shaped components. During the manufacturing process, the tape can be continuously transported and processed to form the desired components.

[0141] The initial active layer is a layer structure used to form an active layer on the target electrode obtained by slitting, the initial first film layer is a layer structure used to form a first film layer on the target electrode obtained by slitting, and the initial second film layer is a layer structure used to form a second film layer on the target electrode obtained by slitting. Figure 8 and Fig. 9 For example, Figure 8 This is a schematic side view of the first strip D1 in some embodiments of the present application. Fig. 9 The side view structure diagram of the second strip D2 in some embodiments of the present application illustrates that the first strip D1 is configured as a pole piece strip D1a, the second strip D2 is configured as a film layer group strip D2a, the pole piece strip D1a includes a current collector strip D11a and an initial active layer D12a disposed on one side of the current collector strip D11a, and the film layer group strip D2a includes an initial first film layer D21a and an initial second film layer D22a stacked. Fig.10 and Fig.11 For example, Fig.10 This is a schematic side view of the first strip D1 in some other embodiments of the present application. Fig.11 This is a schematic diagram of the side structure of the second strip D2 in other embodiments of the present application, illustrating that the first strip D1 is configured as a pole piece strip D1b, the second strip D2 is configured as a film layer strip D2b for forming an initial second film layer, the pole piece strip D1b includes a current collector strip D11b, an initial active layer D12b arranged on one side of the current collector strip D11b, and an initial first film layer D13b arranged on a side of the current collector strip D11b away from the initial active layer D12b.

[0142] In step S111b, an initial target pole piece may be formed by attaching the first strip material and the second strip material. It can be understood that the initial target pole piece is a component used to form a target pole piece obtained by a slitting process.

[0143] In step S111c, the attached first and second strips can be cut according to the required size of the target pole piece through slitting to produce the target pole piece. In the continuous strip attachment process, the slitting process can also maximize the use of materials and reduce production costs. The slitting process can include mechanical slitting or laser slitting, and mechanical slitting can be performed using a tool. There is no specific limitation on the slitting process.

[0144] Since the attached first and second strips include the initial first film layer and the initial second film layer before the target pole piece is cut, the initial first film layer and the initial second film layer can provide support for the current collector strip, thereby improving the curling or warping of the target pole piece when the target pole piece is cut, and further improving the quality of lamination and pressing. In this process, by using the initial first film layer and the initial second film layer as the second strip, the material of the initial first film layer and the initial second film layer can be configured according to different performance requirements, thereby improving the performance of the target pole piece. By using the initial first film layer, the current collector strip and the initial active layer as the first strip (i.e., the pole piece strip), and the initial second film layer as the second strip, the pole piece strip has a certain integrity before being attached to the second strip, and the pole piece strip can be protected by the initial first film layer. In addition, by providing the first strip and the second strip, it is only necessary to attach the first strip to the second strip during the production process, which is conducive to improving production efficiency.

[0145] According to some embodiments of this application, please refer to Fig.12 , Fig.12 The schematic diagram of the process of step S111b in some embodiments of the present application is as follows: attaching the second tape to the first tape to form a stacked initial active layer, a current collector tape, an initial first film layer, and an initial second film layer (i.e., step S111b), including:

[0146] Step SG, performing a glue spraying process on at least one side where the first tape material and the second tape material are connected to each other, so as to form an adhesive layer on at least one side where the first tape material and the second tape material are connected to each other;

[0147] Step SH: adhere the second tape to the first tape via the adhesive layer.

[0148] In step SG, glue spraying can be performed on the side of the first strip that connects to the second strip, or on the side of the second strip that connects to the first strip, or on the side of the first strip that connects to the second strip, and on the side of the second strip that connects to the first strip, without specific limitation.

[0149] In step SH, the adhesive layer has a certain adhesive force, which can make the second tape and the first tape bond together.

[0150] In this way, since the adhesive layer has a certain adhesive force, the first tape and the second tape can be relatively fixed, which is conducive to the subsequent slitting and processing of the attached first tape and the second tape. At the same time, compared with other attachment methods (such as hot pressing, etc.), it is also easy to manufacture, and when the second tape is configured as a film layer tape for forming an initial second film layer, it is also conducive to the subsequent removal of the second film layer on the target electrode.

[0151] According to some embodiments of this application, please refer to Fig.13 , Fig.13 This is a flow chart of step S1 in some embodiments of the present application, providing a target pole piece further includes:

[0152] Step SI, adjusting the tension of the first belt material by means of an adjusting mechanism; along the conveying direction of the first belt material, the adjusting mechanism is located upstream of an initial position where the first belt material is attached to the second belt material.

[0153] In step S1, the adjustment mechanism is a mechanism for controlling the tension of the first strip. The adjustment method of the adjustment mechanism includes but is not limited to changing the path length of the first strip and adjusting the pressure of the pressure roller on the first strip. For example, by adjusting the position of the guide roller, the path length of the first strip is changed, and the tension of the first strip is indirectly adjusted; in addition, by adjusting the pressure of the pressure roller on the first strip, the tension of the first strip can also be controlled. The setting position, structural form and adjustment method of the adjustment mechanism are not specifically limited here.

[0154] Compared with the method of adjusting the winding speed of the first tape (for example, adjusting the winding speed of the first tape by changing the rotation speed of the motor), since the adjustment mechanism is located upstream of the initial position where the first tape and the second tape are attached, the adjustment response speed can be faster and the adjustment stability can be greater.

[0155] In this way, by controlling the tension of the first strip, it is beneficial to improve the uniformity of force on the first strip and the second strip when they are attached, reduce the risk of wrinkles, bubbles or local loose fit, thereby improving the quality of attachment, which in turn is beneficial to improving the electrical performance and safety performance of the battery.

[0156] According to some embodiments of this application, please refer to Fig.14 , Fig.14 This is a flow chart of step SJ in some embodiments of the present application, attaching the second tape to the first tape, comprising:

[0157] Step SJ: rolling the first tape and the second tape by a rolling mechanism to attach the second tape to the first tape.

[0158] In step SJ, the pressure roller mechanism is a mechanism for attaching the second web material to the first web material, and the first web material and the second web material are attached by applying pressure.

[0159] In this way, the pressure applied by the pressure roller mechanism is not only conducive to making the first strip material closely contact with the second strip material, but also can provide more uniform pressure in the width direction of the strip material, thereby improving the attachment effect, which is conducive to improving the pressing effect in the subsequent pressing process step, and then improving the battery performance and the structural stability of the battery.

[0160] According to some embodiments of the present application, the pressure roller mechanism includes a plurality of pressure roller units, and the plurality of pressure roller units are arranged along the conveying direction of the first material belt; wherein, at least one of the plurality of pressure roller units is in use; and / or, the pressure roller unit is configured to provide roller pressure, and the roller pressures corresponding to the plurality of pressure roller units have at least two sizes of roller pressures.

[0161] For example, if the attachment of the first strip material to the second strip material can meet the requirements after the first pressing roller unit, the subsequent pressing roller unit may not be used. If the attachment of the first strip material to the second strip material cannot meet the requirements after the first pressing roller unit, the subsequent pressing roller unit may be used. Of course, multiple pressing roller units may also be used to press the strip material multiple times. The use of multiple pressing roller units is not specifically limited herein.

[0162] By providing multiple pressing roller units and making at least one pressing roller unit in use, one or multiple pressing can be selectively performed according to the strip material. By providing multiple pressing roller units and having at least two sizes of roller pressure, the roller pressure can be configured according to the specific characteristics of the strip material. In this way, not only can the attachment effect be improved, but also the production cost can be controlled.

[0163] According to some embodiments of this application, please refer to Fig.15 , Fig.15 The flowchart of step S120 in some embodiments of the present application is as follows: a plurality of electrode sheets are stacked, pressed, and the second film layer is removed to form an electrode assembly (ie, step S120), including:

[0164] Step S121a, stacking a plurality of pole pieces to form a first assembly; in the first assembly, at least one of the two outermost pole pieces is a target pole piece, and the active layer of the target pole piece is arranged toward the adjacent pole piece;

[0165] Step S122a, pressing the first component to form a second component;

[0166] Step S123a, removing the second film layer in the second component to form an electrode component.

[0167] In this way, by removing the second film layer after the lamination process, the second film layer can be used to improve the structural performance of the first component and protect the first component during the lamination process, which is beneficial to improving the lamination effect.

[0168] According to some embodiments of this application, please refer to Fig.16 , Fig.16 The flowchart of step S120 in some other embodiments of the present application is as follows: a plurality of electrode sheets are stacked, pressed, and the second film layer is removed to form an electrode assembly (ie, step S120), including:

[0169] Step S121b, removing the second film layer on the target electrode;

[0170] Step S122b: stack a plurality of electrode sheets and perform a pressing process to form an electrode assembly.

[0171] Thus, by removing the second film layer before the lamination process, the operation of removing the second film layer is facilitated.

[0172] According to some embodiments of the present application, the force between the first film layer and the current collector is greater than the force between the second film layer and the first film layer.

[0173] The acting force refers to the force connecting the first film layer and the current collector, and the force connecting the second film layer and the first film layer. The acting force may include bonding force, atomic bonding force, etc.

[0174] Thus, when the second film layer needs to be removed, the smaller force between the second film layer and the first film layer makes the removal process easier. This not only reduces the risk of damage to the first film layer and the current collector, but also simplifies the operation process.

[0175] According to some embodiments of the present application, the first film layer and the current collector are bonded together, and the second film layer and the first film layer are bonded together; the bonding force between the first film layer and the current collector is greater than the bonding force between the second film layer and the first film layer.

[0176] Adhesion refers to the force that tightly connects film layers or structures of different materials together. The relatively small adhesion between the second film layer and the first film layer makes it easier to remove the second film layer when needed, while reducing the risk of damaging the connection between the first film layer and the current collector.

[0177] In this way, since the first film layer, the current collector and the second film layer are connected by bonding, it is not only convenient to remove the second film layer, but also the operation process can be simplified and the production efficiency can be improved.

[0178] According to some embodiments of this application, please refer to Fig.17 , Fig.17 This is a schematic structural diagram of the cooperation between the first film layer M1 and the second film layer M2 in some embodiments of the present application. The sum of the thickness of the first film layer M1 and the thickness of the second film layer M2 is greater than or equal to 0.1 mm.

[0179] Exemplarily, the thickness of the first film layer M1 is the first thickness d1, the thickness of the second film layer M2 is the second thickness d2, and the sum of the first thickness d1 and the second thickness d2 is greater than or equal to 0.1 mm. For example, the sum of the first thickness d1 and the second thickness d2 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.7 mm or 1 mm. The upper limit of the sum of the first thickness d1 and the second thickness d2 may be set according to the specific usage, and is not specifically limited here. For example, the upper limit of the sum of the first thickness d1 and the second thickness d2 may be 0.55 mm or 1 mm.

[0180] It should be noted that, in order to facilitate the description and illustration of the first film layer M1 and the second film layer M2, Fig.17 In the figure, the first film layer M1 and the second film layer M2 are stacked together, but the present invention is not limited thereto.

[0181] In this way, by controlling the sum of the thickness of the first film layer M1 and the thickness of the second film layer M2 , it is beneficial to provide a certain support performance for the current collector J of the target electrode, thereby facilitating improving the subsequent pressing quality.

[0182] According to some embodiments of this application, please continue to refer to Fig.17 , the thickness of the first film layer M1 is less than or equal to 0.05 mm; and / or, the thickness of the second film layer M2 is greater than or equal to 0.05 mm.

[0183] Illustratively, the first thickness d1 may be 0.05 mm, 0.04 mm, 0.02 mm, 0.01 mm, 0.005 mm or 0.001 mm, and the second thickness d2 may be 0.05 mm, 0.08 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm or 0.8 mm.

[0184] In this way, by controlling the thickness of the first film layer M1, it is possible not only to provide a certain support performance for the current collector J of the target pole piece, but also to make the thickness of the formed electrode assembly 120 smaller while facilitating manufacturing, which is beneficial to improving the energy density of the battery. By controlling the thickness of the second film layer M2, it is possible not only to further improve the support effect for the current collector J of the target pole piece, but also to make the thickness of the first film layer M1 smaller while facilitating manufacturing, which is beneficial to improving the energy density of the battery.

[0185] According to some embodiments of this application, please continue to refer to Fig.17 , the orthographic projection of the first film layer M1 on the reference plane is within the range of the orthographic projection of the second film layer M2 on the reference plane. The reference plane is perpendicular to the thickness direction Z of the target pole piece. There is a gap between at least part of the outer contour of the orthographic projection of the first film layer M1 on the reference plane and the outer contour of the orthographic projection of the second film layer M2 on the reference plane.

[0186] Here, “at least a portion of the outer contour of the orthographic projection of the first film layer M1 on the reference surface is spaced apart from the outer contour of the orthographic projection of the second film layer M2 on the reference surface” means that the second film layer M2 is disposed beyond the first film layer M1.

[0187] In this way, since the second film layer M2 is disposed beyond the first film layer M1 , in the step of removing the second film layer M2 , the second film layer M2 can be removed by utilizing the portion of the second film layer M2 that exceeds the first film layer M1 .

[0188] According to some embodiments of this application, please continue to refer to Fig.17 , along the width direction W of the target pole piece, the size of the first film layer M1 is smaller than the size of the second film layer M2. The width direction W of the target pole piece and the thickness direction Z of the target pole piece are perpendicular to each other.

[0189] The width refers to the width dimension of the target electrode piece, that is, the distance from one side edge of the target electrode piece to the other side edge of the target electrode piece. The width direction W refers to the direction extending along the width of the target electrode piece, that is, the direction from one side edge of the target electrode piece to the other side edge. The width direction W of the target electrode piece, the length direction L of the target electrode piece, and the thickness direction Z of the target electrode piece are perpendicular to each other. Among them, the length direction L of the target electrode piece refers to the dimension in the conveying direction of the strip mentioned above. It can be understood that during the production process, the target electrode piece is continuously conveyed and processed along the length direction L, and the width direction W represents the lateral dimension direction of the target electrode piece. The length dimension of the target electrode piece and the width dimension of the target electrode piece can be equal or unequal, and the size between the two can be determined according to the slitting process, and no specific restriction is made here.

[0190] In this way, the second film layer M2 is arranged beyond the first film layer M1 in the width direction W of the target electrode. This method facilitates the formation of a structure in which the second film layer M2 is arranged beyond the first film layer M1, making the overall process simpler.

[0191] According to some embodiments of this application, please continue to refer to Fig.17The material of the first film layer M1 includes at least one of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, metal, and stainless steel; and / or the material of the second film layer M2 includes at least one of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, metal, and stainless steel.

[0192] The material of the first film layer M1 and the material of the second film layer M2 can be the same or different. For example, the material of the first film layer M1 and the material of the second film layer M2 can both be polyethylene terephthalate, which is easier to manufacture.

[0193] Thus, by configuring the material of the first film layer M1, the first film layer M1 has a certain mechanical strength and a more stable structure, which is conducive to providing support. By configuring the material of the second film layer M2, the second film layer M2 has a certain mechanical strength and a more stable structure, which is conducive to providing support and facilitating removal.

[0194] According to some embodiments of this application, please continue to refer to Fig.17 , the first film layer M1 is configured as a single-layer structure or a multi-layer structure; and / or, the second film layer M2 is configured as a single-layer structure or a multi-layer structure.

[0195] For example, Fig.17 The figure shows that both the first film layer M1 and the second film layer M2 are configured as a single-layer structure. Of course, the first film layer M1 can also be configured as a single-layer structure and the second film layer M2 can be configured as a multi-layer structure, or the first film layer M1 can be configured as a multi-layer structure and the second film layer M2 can be configured as a multi-layer structure, which is not specifically limited here.

[0196] In this way, the first film layer M1 and the second film layer M2 of a single-layer structure or a multi-layer structure can be set according to different usage requirements. When the corresponding film layer is a single-layer structure, the production process of the film layer can be simplified. When the corresponding film layer is a multi-layer structure, the multi-layer structure can be used to flexibly control the performance of the film layer, thereby further meeting different usage requirements.

[0197] According to some embodiments of this application, please refer to Fig.18 , Fig.18 1 is a schematic diagram of the structure of a battery processing device 1000 in some embodiments of the present application. The present application provides a battery processing device 1000, including a providing device 1100, a forming device 1200, a removing device 1300 and a shelling device 1400. Figure 5 and Figure 6The providing device 1100 is configured to provide a plurality of pole pieces 121, the plurality of pole pieces 121 include a target pole piece T, and the target pole piece T includes an active layer H, a current collector J, a first film layer M1, and a second film layer M2 stacked in sequence. The forming device 1200 is configured to stack and press the plurality of pole pieces 121, and the removing device 1300 is configured to remove the second film layer M2 on the target pole piece T to form an electrode assembly 120. In the electrode assembly 120, at least one of the two outermost pole pieces 121 is the target pole piece T, and the active layer H of the target pole piece T is arranged toward the adjacent pole piece 121. The shell loading device 1400 is configured to load the electrode assembly 120 into the accommodating cavity of the shell 110.

[0198] The providing device 1100 provides a plurality of pole pieces 121 for the entire battery processing flow. Exemplarily, the providing device 1100 may include a storage unit, a conveying mechanism, etc. The storage unit may be in the form of a rack or a silo, etc., for storing the pole pieces 121. The conveying mechanism may be a conveyor belt, a robotic arm, etc. The conveying mechanism may take the pole piece 121 out of the storage unit and convey it to a designated location. Of course, the providing device 1100 may not include a storage unit, and no specific limitation is made here.

[0199] The forming device 1200 is used to stack and press the multiple pole pieces 121 provided by the providing device 1100. The stacking setting is to stack the multiple pole pieces 121 together in a preset order and arrangement. For example, the positive pole pieces, the diaphragm, and the negative pole pieces can be alternately stacked. The pressing process is to apply a certain pressure to make the stacked pole pieces 121 tightly combined to enhance the connection strength between the pole pieces 121. Exemplarily, the forming device 1200 may include a stacking structure and a pressing mechanism. The stacking mechanism may be a robotic arm or other automated stacking equipment that can perform stacking, and multiple pole pieces 121 can be stacked up as required. The pressing mechanism may use a hydraulic, pneumatic or mechanical pressure device to apply a certain pressure to the stacked pole pieces 121 after the stacking is completed. Of course, the forming device 1200 may also include a temperature control system, and when necessary, the pressing effect can be improved by controlling the temperature.

[0200] The removal device 1300 is a device for removing the second film layer M2 on the target pole piece T. The removal device 1300 and the forming device 1200 cooperate with each other to form the electrode assembly 120. Exemplarily, the removal method of the removal device 1300 may include mechanical peeling, heat peeling or chemical dissolution. For example, the second film layer M2 can be removed from the target pole piece T by configuring the removal device 1300 in the form of a clamp structure to clamp the second film layer M2. The corresponding removal method can be selected according to the material properties of the second film layer M2 and the requirements of battery production, and no specific limitation is made here.

[0201] The shell loading device 1400 is a device for loading the electrode assembly 120 obtained after the forming and removal of the second film layer M2 into the receiving cavity of the shell 110. Figure 4 , the shell loading device 1400 can preliminarily seal or fix the end cap 112 to the shell 111 after the electrode assembly 120 is loaded into the shell 111, and no specific limitation is made here. Exemplarily, the shell loading device 1400 may include a grasping mechanism, a positioning mechanism and a shell loading mechanism. The grasping mechanism can use a robotic arm or a vacuum suction cup to grasp the electrode assembly 120 from the processing station and transfer it to the position of the shell 110. The positioning mechanism can be used to determine the position of the housing cavity of the shell 110 and the electrode assembly 120. The shell loading mechanism can place the electrode assembly 120 into the housing cavity of the shell 110.

[0202] Thus, by providing a plurality of pole pieces 121 including a target pole piece T, the device 1100 is provided. Since the active layer H is provided on one side of the current collector J in the target pole piece T, and the first film layer M1 and the second film layer M2 are provided on the other side of the current collector J, compared with the method of providing the active layer H on one side of the current collector J of the target pole piece T, it is beneficial to improve the stress condition of the target pole piece T with the help of the first film layer M1 and the second film layer M2, thereby improving the quality of the electrode assembly 120 formed by stacking and pressing by the forming device 1200, thereby improving the mechanical properties of the battery and reducing the safety risk. At the same time, since the removal device 1300 is used to remove the second film layer M2, the first film layer M1 can be made thinner, which is beneficial to improve the energy density and thus improve the electrical performance of the battery. In addition, compared with the method of providing the active layer H on both sides of the current collector J of the target pole piece T, it is beneficial to reduce the production cost. Thus, the overall performance of the battery is improved while the production cost is reduced.

[0203] According to some embodiments of this application, please continue to refer to Fig.18 , and combined with reference Fig.19 , Fig.19 1 is a schematic diagram of the structure of the first providing mechanism 1110 in some embodiments of the present application. The providing device 1100 includes the first providing mechanism 1110. The first providing mechanism 1110 includes a first unwinding mechanism 1111, a second unwinding mechanism 1112, an attaching mechanism 1113 and a cutting mechanism 1114.

[0204] The first unwinding mechanism 1111 is configured to provide the first tape D1. The second unwinding mechanism 1112 is configured to provide the second tape D2. Exemplarily, the first unwinding mechanism 1111 may include components such as an unwinding shaft and a drive motor. The unwinding shaft may be used to carry the first tape roll. The drive motor may provide rotational power to the unwinding shaft so that it can rotate and release the first tape D1. The second unwinding mechanism 1112 may be understood with reference to the first unwinding mechanism 1111, and will not be described in detail herein.

[0205] Among them, the first strip D1 is configured as a pole piece strip, the second strip D2 is configured as a film layer group strip, the pole piece strip includes a current collector strip and an initial active layer provided on one side of the current collector strip, and the film layer group strip includes an initial first film layer and an initial second film layer stacked; or, the first strip D1 is configured as a pole piece strip, the second strip D2 is configured as a film layer strip for forming an initial second film layer, the pole piece strip includes a current collector strip, an initial active layer provided on one side of the current collector strip, and an initial first film layer provided on a side of the current collector strip away from the initial active layer. For the relevant implementation methods and advantages of the first strip D1 and the second strip D2, reference can be made to the contents illustrated in some of the aforementioned embodiments, which will not be repeated here.

[0206] The attachment mechanism 1113 is located downstream of the first unwinding mechanism 1111 and the second unwinding mechanism 1112. The attachment mechanism 1113 is configured to attach the first strip D1 and the second strip D2. In this way, preparations can be made for the subsequent cutting process. Exemplarily, this can be achieved using a pressure roller or other pressure-applying device. The pressure roller is usually composed of one or more pairs of rollers that cooperate with each other. The rollers can apply a certain amount of pressure so that the first strip D1 and the second strip D2 passing through fit tightly under the action of pressure. In addition, the attachment mechanism 1113 may also include a heating element, which can enhance the attachment effect according to different materials. At the same time, the attachment mechanism 1113 may also include a guide structure, so that the relative position between the first strip D1 and the second strip D2 can be more accurate.

[0207] The cutting mechanism 1114 is located downstream of the attachment mechanism 1113. The cutting mechanism 1114 is configured to perform slitting processing on the first strip D1 and the second strip D2 after attachment to form a target pole piece T. Exemplarily, the cutting mechanism 1114 can be used for cutting by means of a tool or a laser beam. Furthermore, the cutting mechanism 1114 can also include a positioning and measuring component, which can control the cutting size to obtain a target pole piece T of a desired size. When the cutting mechanism 1114 cuts the first strip D1 and the second strip D2 after attachment, it can be cut statically after positioning. Due to the provision of the first initial film layer and the second initial film layer, the target pole piece T has a certain rigidity, which can further balance the internal stress generated by the target pole piece T being provided with the active layer H only on one side, thereby improving the warping and curling of the target pole piece T.

[0208] By setting the first unwinding mechanism 1111 and the second unwinding mechanism 1112, the first strip material D1 and the second strip material D2 can be continuously fed. At the same time, since the attachment mechanism 1113 is located downstream of the first unwinding mechanism 1111 and the second unwinding mechanism 1112, and the cutting mechanism 1114 is located downstream of the attachment mechanism 1113, a continuous production arrangement is formed, which is conducive to improving production efficiency. The advantages brought by the configuration of the first strip material D1 and the second strip material D2 can be referred to the advantages illustrated in some of the aforementioned embodiments, and will not be repeated here.

[0209] According to some embodiments of this application, please continue to refer to Fig.19 The first providing mechanism 1110 further includes a glue spraying mechanism 1115. The glue spraying mechanism 1115 is located upstream of the attaching mechanism 1113. The glue spraying mechanism 1115 is configured to perform glue spraying on at least one side of the first and second strips D1 and D2 where the first and second strips D1 and D2 are attached to each other.

[0210] The glue spraying mechanism 1115 is a mechanism for distributing the adhesive material on the surface of the corresponding strip material. For example, the glue spraying mechanism 1115 can spray the adhesive material on the side where the first strip material D1 and the second strip material D2 need to be attached through a nozzle and other related structures, which is not specifically limited here.

[0211] By providing the glue spraying mechanism 1115, an adhesive layer can be formed on at least one surface of the first strip D1 and the second strip D2 where they are attached to each other before the first strip D1 and the second strip D2 are attached, which helps to improve the firmness of the attachment of the first strip D1 and the second strip D2 during the attachment. At the same time, since the glue spraying mechanism 1115 is located upstream of the attachment mechanism 1113, it is convenient to form a continuous manufacturing process with the subsequent attachment mechanism 1113, thereby improving the manufacturing efficiency.

[0212] According to some embodiments of this application, please continue to refer to Fig.19 The first providing mechanism 1110 further includes an adjusting mechanism 1116. The adjusting mechanism 1116 is located upstream of the attaching mechanism 1113. The adjusting mechanism 1116 is configured to adjust the tension of the first strip D1.

[0213] The relevant implementations of the adjustment mechanism 1116 may refer to the relevant implementations of the adjustment mechanism 1116 illustrated in some of the aforementioned embodiments, and no specific limitation is made here.

[0214] Before attachment, the tension of the first strip D1 is adjusted by setting an adjustment mechanism 1116, which is beneficial to improving the force uniformity of the first strip D1 and the second strip D2 when the first strip D1 and the second strip D2 are attached, reducing the risk of wrinkles, bubbles or local loose fitting, thereby helping to improve the electrical performance and safety performance of the battery.

[0215] According to some embodiments of this application, please continue to refer to Fig.19 The attachment mechanism 1113 includes a pressing roller mechanism G. The pressing roller mechanism G is located downstream of the first unwinding mechanism 1111 and the second unwinding mechanism 1112 , and the pressing roller mechanism G is configured to roll the first and second strips D1 and D2 .

[0216] Exemplarily, the pressing roller mechanism G may include a pressing roller, a driving component, and a pressure regulating component. After the first strip D1 and the second strip D2 are conveyed from the first unwinding mechanism 1111 and the second unwinding mechanism 1112, they enter the pressing roller mechanism G. The pressing roller rotates under the drive of the driving component, and at the same time, under the pressure applied by the pressure regulating device, the first strip D1 and the second strip D2 passing through are pressed. The friction between the pressing roller and the strip allows the strip to continue to be conveyed, and at the same time, under the action of pressure, the first strip D1 and the second strip D2 are tightly pressed together to achieve attachment.

[0217] In this way, the pressure applied by the pressure roller mechanism G is not only conducive to making the first strip D1 and the second strip D2 in close contact, but also can provide more uniform pressure in the width direction of the strip, thereby improving the attachment effect, which is conducive to improving the pressing effect in the subsequent pressing process step, and then improving the battery performance and the structural stability of the battery.

[0218] According to some embodiments of this application, please continue to refer to Fig.19 The roller mechanism G includes a plurality of roller units G1, and the plurality of roller units G1 are arranged along the conveying direction of the first strip D1. At least one of the plurality of roller units G1 is in use; and / or the roller unit G1 is configured to provide roller pressure, and the roller pressures corresponding to the plurality of roller units G1 have at least two roller pressures.

[0219] The advantages of the plurality of pressing roller units G1 illustrated in the above embodiments can be understood, and will not be described in detail here. Fig.19 In the figure, it is shown that there are two pressing roller units G1. Of course, the pressing roller units G1 can also be provided with other numbers, which is not specifically limited here.

[0220] According to some embodiments of this application, please continue to refer to Fig.19 The first providing mechanism 1110 also includes a correcting mechanism 1117, which is located downstream of the attaching mechanism 1113 and upstream of the cutting mechanism 1114, and the correcting mechanism 1117 is configured to correct the first and second strips of material D1 and D2 after attachment; and / or, the first providing mechanism 1110 also includes an adjusting mechanism 1118, which is located downstream of the attaching mechanism 1113 and upstream of the cutting mechanism 1114, and the adjusting mechanism 1118 is configured to adjust the conveying speed of the first and second strips of material D1 and D2 after attachment.

[0221] The deflection correction mechanism 1117 is a mechanism for placing the attached first strip D1 and the second strip D2 in the desired position. Exemplarily, the deflection correction mechanism 1117 may include a position sensor, which can monitor the edge position of the strip or the corresponding mark position in real time, and feed back the actual position information of the strip to the corresponding controller. The controller can compare the information fed back by the position sensor with the preset position to obtain the offset. For example, if the position sensor detects that the attached first strip D1 and the second strip D2 are offset to the left, the deflection correction mechanism 1117 can adjust the attached first strip D1 and the second strip D2 to the right. No specific limitation is made here.

[0222] The adjustment mechanism 1118 is a mechanism for adjusting the conveying speed of the first and second strips of material D1 and D2 after attachment. Exemplarily, the adjustment mechanism 1118 may include a speed sensor, which may be used to monitor the current conveying speed of the first and second strips of material D1 and D2 after attachment. The adjustment mechanism 1118 may adjust the conveying speed of the first and second strips of material D1 and D2 after attachment according to the detection signal of the speed sensor. For example, the conveying speed of the strips may be changed by adjusting the rotation speed of the drive motor, and the speed regulation of the motor may be achieved by a frequency converter or a motor driver. For another example, the speed may also be adjusted by changing the transmission ratio of the strips, such as adjusting the transmission ratio of a pulley or a gear. No specific limitation is made here.

[0223] The attached strip may be positionally offset due to deviations during the attachment process or interference during the transmission process. By setting up a deviation correction mechanism 1117, the aforementioned positional offset can be reduced, which is beneficial for the subsequent cutting of the target electrode T that meets the size requirements, and thus is beneficial for improving the overall performance and consistency of the battery. Since the operating speeds of each process may be different, the conveying speed of the attached strip can be flexibly adjusted by setting up an adjustment mechanism 1118, so that the attached first strip D1 and the second strip D2 enter the cutting mechanism 1114 at the required speed, which is beneficial for the cutting mechanism 1114 to cut the attached first strip D1 and the second strip D2, and thus can improve the cutting quality. Furthermore, the deviation correction mechanism 1117 and the adjustment mechanism 1118 can cooperate with each other during the processing process to jointly improve the quality of subsequent cutting and other processes and improve production efficiency.

[0224] The manufacturing process of the battery cell 100 is exemplarily described below in combination with the manufacturing method of the battery cell 100 and the battery processing equipment 1000 illustrated in some of the above embodiments, but the present invention is not limited thereto.

[0225] Please refer to Figure 3 , Figure 5 , Figure 6 , Figure 8 , Fig. 9 , Fig.18 and Fig.19 The manufacturing method of the battery cell 100 comprises the following steps:

[0226] First, the first strip D1 is unwound by the first unwinding mechanism 1111, the second strip D2 is unwound by the second unwinding mechanism 1112, and the second strip D2 is attached to the first strip D1 by the glue spraying mechanism 1115 to perform glue spraying to form a sticky layer; wherein the first strip D1 is configured as a pole piece strip D1a, and the second strip D2 is configured as a film layer group strip D2a, the pole piece strip D1a includes a current collector strip D11a and an initial active layer D12a arranged on one side of the current collector strip D11a, and the film layer group strip D2a includes an initial first film layer D21a and an initial second film layer D22a stacked, and the material of the initial first film layer D21a and the material of the initial second film layer D22a are both polyethylene terephthalate (PET);

[0227] Next, the first strip D1 and the second strip D2 are rolled by a roller mechanism G, so that the second strip D2 is attached to the first strip D1 by means of an adhesive layer to form a stacked initial active layer, a current collector strip, an initial first film layer, and an initial second film layer;

[0228] Then, the attached first strip D1 and second strip D2 are cut by the cutting mechanism 1114 to form a target pole piece T;

[0229] Subsequently, the plurality of pole pieces 121 are stacked and pressed together by the forming device 1200, and the second film layer M2 on the target pole piece T is removed by the removing device 1300 to obtain the electrode assembly 120; wherein, in the electrode assembly 120, the two outermost pole pieces 121 are the target pole pieces T from which the second film layer M2 is removed, and the active layer H of the target pole piece T is arranged toward the adjacent pole piece 121;

[0230] Next, the electrode assembly 120 is loaded into the receiving cavity of the outer shell 110 by the shell loading device 1400 to form the battery cell 100 .

[0231] In the manufacturing method of the battery cell 100 illustrated above, the tension of the first strip D1 can be adjusted by the adjustment mechanism 1116, the rolling mode of the roller unit G1 can be configured differently, the deviation correction mechanism 1117 can be used to correct the deviation, and the conveying speed of the first strip D1 and the second strip D2 after attachment can be adjusted by the adjustment mechanism 1118 according to the actual situation, and no specific restrictions are made here. In addition, in the conveying process of the corresponding strip, multiple conveying rollers S can be set on the conveying path of the strip to cooperate in conveying the corresponding strip.

[0232] It should be understood that the various steps illustrated above are not necessarily performed in the order shown. Unless clearly stated in the embodiments of the present application, there is no strict order restriction for the execution of these steps, and these steps can be performed in other orders. Moreover, at least a part of the steps may include multiple steps or multiple stages, and these steps or stages are not necessarily completed at the same time, but can be performed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed in turn or alternately with other steps or at least a part of the steps or stages in other steps. For example, for the step of "stacking multiple pole pieces, laminating, and removing the second film layer", it can be stacking, laminating, and then removing, or it can be removing, stacking, and laminating, or it can be stacking, removing, and then laminating. No specific restrictions are made here.

[0233] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for manufacturing a battery cell, characterized in that: include: Providing multiple pole pieces; The plurality of pole pieces include a target pole piece, and the target pole piece includes an active layer, a current collector, a first film layer, and a second film layer stacked in sequence; The plurality of pole pieces are stacked, pressed, and the second film layer is removed to form an electrode assembly; in the electrode assembly, at least one of the two outermost pole pieces is the target pole piece from which the second film layer is removed, and the active layer of the target pole piece is arranged toward the adjacent pole piece; A shell is provided, and the electrode assembly is installed in a receiving cavity of the shell to form a battery cell.

2. The method for manufacturing a battery cell according to claim 1, characterized in that: The providing of a plurality of pole pieces includes providing the target pole piece, and the providing of the target pole piece includes: A first strip material and a second strip material are provided; wherein the first strip material is configured as a pole piece strip material, and the second strip material is configured as a film layer group strip material, the pole piece strip material includes a current collector strip material and an initial active layer provided on one side of the current collector strip material, and the film layer group strip material includes an initial first film layer and an initial second film layer stacked; or, the first strip material is configured as a pole piece strip material, and the second strip material is configured as a film layer strip material for forming an initial second film layer, and the pole piece strip material includes a current collector strip material, an initial active layer provided on one side of the current collector strip material, and an initial first film layer provided on a side of the current collector strip material away from the initial active layer; attaching the second tape to the first tape to form a stacked arrangement of an initial active layer, a current collector tape, an initial first film layer, and an initial second film layer; The first and second strips attached are cut to form the target pole pieces.

3. The method for manufacturing a battery cell according to claim 2, characterized in that: The step of attaching the second tape to the first tape to form a stacked initial active layer, a current collector tape, an initial first film layer, and an initial second film layer comprises: Performing a glue spraying process on at least one side where the first tape material and the second tape material are connected to each other, so as to form an adhesive layer on at least one side where the first tape material and the second tape material are connected to each other; The second tape is adhered to the first tape by the adhesive layer.

4. The method for manufacturing a battery cell according to claim 2, characterized in that: The providing of the target pole piece further comprises: The tension of the first belt material is adjusted by an adjusting mechanism; along the conveying direction of the first belt material, the adjusting mechanism is located upstream of an initial position where the first belt material is attached to the second belt material.

5. The method for manufacturing a battery cell according to claim 2, characterized in that: The attaching the second tape to the first tape comprises: The first tape material and the second tape material are rolled by a roller mechanism so that the second tape material is attached to the first tape material.

6. The method for manufacturing a battery cell according to claim 5, characterized in that: The pressing roller mechanism comprises a plurality of pressing roller units, and the plurality of pressing roller units are arranged along the conveying direction of the first strip material; Wherein, at least one of the plurality of pressing roller units is in use; and / or The pressure roller unit is configured to provide a roller pressure, and the roller pressures corresponding to the plurality of pressure roller units have at least two sizes of roller pressures.

7. The method for manufacturing a battery cell according to any one of claims 1 to 6, characterized in that: The step of stacking and pressing the plurality of pole pieces and removing the second film layer to form an electrode assembly includes: The plurality of pole pieces are stacked to form a first assembly; in the first assembly, at least one of the two outermost pole pieces is the target pole piece, and the active layer of the target pole piece is arranged toward the adjacent pole piece; Performing a pressing process on the first component to form a second component; The second film layer in the second assembly is removed to form the electrode assembly.

8. The method for manufacturing a battery cell according to any one of claims 1 to 6, characterized in that: The step of stacking and pressing the plurality of pole pieces and removing the second film layer to form an electrode assembly includes: removing the second film layer on the target pole piece; The plurality of pole pieces are stacked and pressed together to form the electrode assembly.

9. The method for manufacturing a battery cell according to any one of claims 1 to 6, characterized in that: The acting force between the first film layer and the current collector is greater than the acting force between the second film layer and the first film layer.

10. The method for manufacturing a battery cell according to claim 9, characterized in that: The first film layer is bonded to the current collector, and the second film layer is bonded to the first film layer; The bonding force between the first film layer and the current collector is greater than the bonding force between the second film layer and the first film layer.

11. The method for manufacturing a battery cell according to any one of claims 1 to 6, characterized in that: The sum of the thickness of the first film layer and the thickness of the second film layer is greater than or equal to 0.1 mm.

12. The method for manufacturing a battery cell according to any one of claims 1 to 6, characterized in that: The thickness of the first film layer is less than or equal to 0.05 mm; and / or The thickness of the second film layer is greater than or equal to 0.05 mm.

13. The method for manufacturing a battery cell according to any one of claims 1 to 6, characterized in that: The orthographic projection of the first film layer on the reference plane is located within the orthographic projection range of the second film layer on the reference plane; the reference plane is perpendicular to the thickness direction of the target pole piece; There is a gap between at least a portion of an outer contour of an orthographic projection of the first film layer on the reference surface and an outer contour of an orthographic projection of the second film layer on the reference surface.

14. The method for manufacturing a battery cell according to claim 13, characterized in that: Along the width direction of the target electrode piece, the size of the first film layer is smaller than the size of the second film layer; The width direction of the target pole piece and the thickness direction of the target pole piece are perpendicular to each other.

15. The method for manufacturing a battery cell according to any one of claims 1 to 6, characterized in that: The material of the first film layer includes at least one of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, metal, and stainless steel; and / or The material of the second film layer includes at least one of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, metal, and stainless steel.

16. The method for manufacturing a battery cell according to any one of claims 1 to 6, characterized in that: The first film layer is configured as a single-layer structure or a multi-layer structure; and / or The second film layer is configured as a single-layer structure or a multi-layer structure.

17. A battery processing device, characterized in that: include: A providing device is configured to provide a plurality of pole pieces, wherein the plurality of pole pieces include a target pole piece, wherein the target pole piece includes an active layer, a current collector, a first film layer, and a second film layer stacked in sequence; A forming device and a removing device, wherein the forming device is configured to stack and press the plurality of pole pieces, and the removing device is configured to remove the second film layer on the target pole piece to form an electrode assembly; in the electrode assembly, at least one of the two outermost pole pieces is the target pole piece, and the active layer of the target pole piece is arranged toward the adjacent pole piece; and The shell loading device is configured to load the electrode assembly into the accommodating cavity of the shell.

18. The battery processing equipment according to claim 17, characterized in that: The providing device comprises a first providing mechanism; the first providing mechanism comprises: A first unwinding mechanism and a second unwinding mechanism, wherein the first unwinding mechanism is configured to provide a first tape material, and the second unwinding mechanism is configured to provide a second tape material; an attachment mechanism located downstream of the first unwinding mechanism and the second unwinding mechanism; the attachment mechanism is configured to attach the first belt material and the second belt material; and A cutting mechanism, located downstream of the attachment mechanism; the cutting mechanism is configured to perform a slitting process on the first strip material and the second strip material after attachment to form the target pole piece; wherein the first strip is configured as a pole piece strip, the second strip is configured as a film layer group strip, the pole piece strip comprises a current collector strip and an initial active layer disposed on one side of the current collector strip, and the film layer group strip comprises an initial first film layer and an initial second film layer stacked; or The first strip is configured as a pole piece strip, the second strip is configured as a film layer strip for forming an initial second film layer, the pole piece strip includes a current collector strip, an initial active layer arranged on one side of the current collector strip, and an initial first film layer arranged on a side of the current collector strip facing away from the initial active layer.

19. The battery processing equipment according to claim 18, characterized in that: The first providing mechanism also includes a glue spraying mechanism; The glue spraying mechanism is located upstream of the attachment mechanism; the glue spraying mechanism is configured to perform glue spraying processing on at least one side where the first belt material and the second belt material are attached to each other.

20. The battery processing equipment according to claim 18, characterized in that The first providing mechanism also includes an adjusting mechanism; The adjustment mechanism is located upstream of the attachment mechanism; the adjustment mechanism is configured to adjust the tension of the first belt material.

21. The battery processing equipment according to claim 18, characterized in that: The attachment mechanism includes a pressure roller mechanism; The pressing roller mechanism is located downstream of the first unwinding mechanism and the second unwinding mechanism, and the pressing roller mechanism is configured to roll the first strip material and the second strip material.

22. The battery processing equipment according to claim 21, characterized in that: The pressing roller mechanism comprises a plurality of pressing roller units, and the plurality of pressing roller units are arranged along the conveying direction of the first strip material; Wherein, at least one of the plurality of pressing roller units is in use; and / or The pressure roller unit is configured to provide a roller pressure, and the roller pressures corresponding to the plurality of pressure roller units have at least two sizes of roller pressures.

23. The battery processing equipment according to claim 18, characterized in that: The first providing mechanism further comprises a deflection correcting mechanism, the deflection correcting mechanism is located downstream of the attaching mechanism and upstream of the cutting mechanism, and the deflection correcting mechanism is configured to correct the deflection of the first belt material and the second belt material after attachment; and / or The first providing mechanism further includes an adjusting mechanism, which is located downstream of the attaching mechanism and upstream of the cutting mechanism, and is configured to adjust the conveying speed of the first and second tapes after being attached.

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