Method for manufacturing battery cell and battery processing apparatus

Abstract

The application relates to the technical field of batteries, in particular to a battery cell manufacturing method and a battery processing device. In the embodiment of the application, at least one of the two outermost pole pieces in an electrode assembly is configured as a target pole piece, and a second film layer on the target pole piece is removed in the process of forming the electrode assembly. In this way, the stress condition of the target pole piece can be improved by means of the first film layer and the second film layer, thereby improving the quality of lamination and pressing, and further improving the mechanical performance of the battery and reducing the safety risk. In addition, the first film layer can be made thinner, which is beneficial to improving the energy density, thereby improving the electrical performance of the battery, and the surface quality of the target pole piece can also be improved. Furthermore, compared with the method of arranging active layers on both sides of the current collector of the target pole piece, the manufacturing cost is reduced. Therefore, the performance of the battery is improved as a whole, and the manufacturing cost is reduced.

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] Currently, battery electrode assemblies are primarily manufactured through lamination or winding processes. These laminated electrode assemblies are widely used due to their numerous advantages, such as high rate capability and high energy density. However, the performance of batteries using laminated electrode assemblies 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 including an active layer, a current collector, a first film layer, and a second film layer stacked in sequence;

[0006] A plurality of electrode sheets 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 electrode sheets is the 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;

[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 electrode sheets in the electrode assembly is configured as a target electrode sheet, and the second film layer on the target electrode sheet is removed during the process of forming the electrode assembly. In this process, since the active layer is provided on one side of the current collector in the target electrode sheet, and the first film layer and the second film layer are provided on the other side of the current collector, compared with the method of providing the active layer on one side of the current collector of the target electrode sheet, it is beneficial to use the first film layer and the second film layer to improve the stress condition of the target electrode sheet, thereby improving the quality of lamination and pressing, thereby improving the mechanical performance 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 and thus improve the electrical performance of the battery, but it can also improve the surface quality of the target electrode sheet. In addition, compared with the method of providing the active layer on both sides of the current collector of the target electrode sheet, it is beneficial to reduce the production cost. As a result, the overall performance of the battery is improved while the production cost is reduced.

[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 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 assembly 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 assembly strip material includes an initial first film layer and an initial second film layer stacked together; 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, 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 facing 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 to form target pole pieces.

[0013] Because the attached first and second tapes comprise an initial first film layer and an initial second film layer before slitting to form the target electrode sheets, they provide support for the current collector tape, thereby reducing curling or warping of the target electrode sheets during slitting and further improving the quality of lamination and lamination. By using the initial first and second film layers as the second tape, the materials of the initial first and second film layers can be tailored to suit different performance requirements, thereby enhancing the performance of the target electrode sheets. By using the initial first film layer, current collector tape, and initial active layer as the first tape (also known as the electrode sheet tape) and the initial second film layer as the second tape, the electrode sheet tape already possesses a certain degree of integrity before being attached to the second tape, allowing the initial first film layer to protect the electrode sheet. Furthermore, by providing a first and second tape, only the first and second tapes need to be attached during the manufacturing process, improving production efficiency.

[0014] In some embodiments, attaching a second tape to a 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 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, due to the adhesive layer's certain bonding strength, the first and second strips can be relatively fixed, thus facilitating the subsequent slitting and attaching of the first and second strips. Furthermore, compared to other attachment methods (such as hot pressing), this method is also easier to manufacture. When the second strip is configured as a film strip for forming the initial second film layer, it also facilitates the subsequent removal of the second film layer from the target electrode.

[0018] In some embodiments, providing the 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 and the second belt material are attached.

[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 fitting, 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 and second webs are rolled by a pressing roller mechanism so that the second web is attached to the first web.

[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 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 ensuring that at least one is in use, the web can be selectively pressed once or multiple times, depending on the web material. By providing multiple pressing roller units with at least two different pressure levels, the pressure can be tailored to the specific characteristics of the web material. This not only improves the attachment effect but also helps control production costs.

[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 the active layer of the target pole piece is arranged toward the adjacent pole piece;

[0028] performing a pressing 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 conducive 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 electrode;

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

[0034] In this way, 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, not only can a certain degree of support performance be provided for the current collector of the target electrode piece, but it can also facilitate manufacturing while making the thickness of the formed electrode assembly smaller, which is beneficial to improving the energy density of the battery. By controlling the thickness of the second film layer, not only can the support effect for the current collector of the target electrode piece be further improved, but it can also facilitate manufacturing while making the thickness of the first film layer smaller, 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 surface is located within the range of the orthographic projection of the second film layer on the reference surface; the reference surface is perpendicular to the thickness direction of the target electrode; at least a portion of the outer contour of the orthographic projection of the first film layer on the reference surface is spaced from the outer contour of the orthographic projection of the second film layer on the reference surface.

[0044] In this way, since the second film layer is disposed beyond the first film layer, it is advantageous that in the step of removing the second film layer, the second film layer can be removed by means of the portion of the second film layer that exceeds the first 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, thereby facilitating support. By configuring the material of the second film layer, the second film layer has a certain mechanical strength and a more stable structure, thereby facilitating 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] Thus, the first film layer and the second film layer in the single-layer structure or the multi-layer structure can be set according to different use requirements. In the case of the corresponding film layer in the single-layer structure, the manufacturing process of the film layer can be simplified. In the case of the corresponding film layer in the multi-layer structure, the performance of the film layer can be flexibly controlled by using the multi-layer structure, so that different use requirements can be further met.

[0051] In a second aspect, the application provides a battery processing device, comprising: a providing device configured to provide a plurality of pole pieces, the plurality of pole pieces comprising a target pole piece, the target pole piece comprising an active layer, a current collector, a first film layer and a second film layer which are sequentially stacked; a forming device and a removing device, the forming device being configured to stack and press the plurality of pole pieces, and the removing device being 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 faces the adjacent pole piece; and a casing device configured to fit the electrode assembly into a receiving cavity of a shell.

[0052] By providing the plurality of pole pieces including the target pole piece, 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 way of arranging the active layer on one side of the current collector in the target pole piece, it is beneficial to improve the stress condition of the target pole piece by means of the first film layer and the second film layer, thereby improving the quality of the electrode assembly formed by the stacking and pressing of the forming device, and further improving the mechanical performance of the battery and reducing the safety risk. At the same time, since the removing 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 further improve the electrical performance of the battery. In addition, compared with the way of arranging the active layer on both sides of the current collector in the target pole piece, it is beneficial to reduce the manufacturing cost. Thus, the performance of the battery is improved as a whole while the manufacturing cost is reduced.

[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 the first tape, and the second unwinding mechanism is configured to provide the second tape; 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 and the second tape; and a cutting mechanism, located downstream of the attachment mechanism; the cutting mechanism is configured to perform slitting processing on the attached first tape and the second tape 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 arranged in a stacked manner; 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 the side of the current collector strip away from the initial active layer.

[0054] By providing a first unwinding mechanism and a second unwinding mechanism, continuous feeding of the first and second strips can be achieved. Furthermore, 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, thereby improving production efficiency. The advantages of the configuration of the first and second strips can be referred to as those illustrated in the aforementioned embodiments and will not be elaborated upon 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 and second tapes are attached to each other.

[0056] By providing a glue spraying mechanism, an adhesive layer can be formed on at least one of the surfaces where the first and second strips are attached to each other before the first and second strips are attached. This helps to improve the firmness of the attachment of the first and second strips during attachment. Furthermore, because the glue spraying mechanism is located upstream of the attachment mechanism, it facilitates a continuous production process with the subsequent attachment mechanism, thereby improving production 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] The tension of the first belt material is adjusted by setting the adjusting mechanism before attachment, which is beneficial to improve the uniformity of the stress of the first belt material and the second belt material when the first belt material and the second belt material are attached, and reduce the risk of wrinkles, bubbles or local poor adhesion, thereby improving the electrical performance and safety performance of the battery.

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

[0060] In this way, the pressure applied by the pressure roller mechanism not only facilitates the close contact of the first belt material and the second belt material, but also provides more uniform pressure in the width direction of the belt material, thereby improving the attachment effect, facilitating the pressing effect in the subsequent pressing process, and further improving the battery performance and structural stability of the battery.

[0061] In some embodiments, 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 belt material. At least one pressure roller unit in the plurality of pressure roller units is in use; and / or the pressure roller units are configured to provide rolling pressure, and the rolling pressure corresponding to the plurality of pressure roller units has at least two sizes of rolling pressure.

[0062] The advantages of the plurality of pressure roller units can be understood with reference to the advantages of the plurality of pressure roller units illustrated in some of the foregoing embodiments, which will not be described here again.

[0063] In some embodiments, the first providing mechanism further includes a deviation correction mechanism, which is located downstream of the attachment mechanism and upstream of the cutting mechanism, and is configured to correct the deviation 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 attachment mechanism and upstream of the cutting mechanism, and is configured to adjust the conveying speed of the first belt material and the second belt material after attachment.

[0064] The belt material after attachment may deviate due to deviation in the attachment process or interference in the transmission process. By setting the deviation correction mechanism, the above-mentioned deviation can be reduced, thereby facilitating the subsequent cutting of the target pole piece meeting the size requirements, and further improving the overall performance and consistency of the battery. Since the operation speed of each process may be different, the conveying speed of the belt material after attachment can be flexibly adjusted by setting the adjusting mechanism, so that the first belt material and the second belt material after attachment enter the cutting mechanism at the required speed, thereby facilitating the cutting of the first belt material and the second belt material after attachment by the cutting mechanism, and further improving 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 skilled in the art upon reading the detailed description of the embodiments below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

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

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

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

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

[0071] Figure 5 Schematic diagram of the structure of the 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 electrode in some embodiments of the present application;

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

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

[0076] Figure 10 This is a schematic side view of the first strip of material in some other embodiments of the present application;

[0077] Figure 11 This is a schematic side view of the structure of the second strip in some other embodiments of the present application;

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

[0079] Figure 13 This is a flow chart of step S1 in some embodiments of the present application;

[0080] Figure 14 This is a flow chart of steps SJ in some embodiments of the present application;

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

[0082] Figure 16 This is a flowchart of step S120 in some other embodiments of the present application;

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

[0084] Figure 18 This is a schematic structural diagram of battery processing equipment in some embodiments of the present application;

[0085] Figure 19 This is a structural diagram 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 portion 210, second box body portion 220;

[0091] First strip D1, second strip 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 and 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, adjusting 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, S1, S111c, S120, S121a, S122a, S123a, S121b, S122b, S130. DETAILED DESCRIPTION

[0098] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended 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 those skilled in the art 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" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0100] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0101] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, 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 merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0103] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0104] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and 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 devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot 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 explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0106] At present, from the development of market situation, the application of power battery is more and more extensive. The power battery is not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

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

[0108] Based on this, in order to improve the performance of the battery using the laminated electrode assembly, the embodiments of the present application provide a battery cell manufacturing method and a battery processing device, by providing a supporting force to at least one of the electrode plates on the outermost side of the electrode assembly, the quality of the electrode assembly is improved, and the performance of the battery is improved. Specifically, by providing a supporting structure on the outside of at least one of the electrode plates on the outermost side of the electrode assembly to provide a supporting force to the electrode plate, and part of the supporting structure can be removed, not only can improve the stress condition of the electrode plate, but also can improve the forming quality of the electrode assembly, thereby improving the overall performance of the battery.

[0109] The battery cell manufactured by the battery cell manufacturing method disclosed in the embodiments of the present application can be used in, but not limited to, electric equipment such as vehicles, ships or aircrafts. The power supply system of the electric equipment can be composed of the battery cell disclosed in the present application and other components, which is beneficial to improve the performance of the battery.

[0110] The embodiments of the present application provide a kind of electric equipment using battery device as power supply, and the electric equipment is the device that realizes corresponding function by consuming electric energy with electric energy as energy source. Exemplarily, the electric equipment can be, but not limited to, mobile phone, tablet computer, notebook computer, electric toy, electric tool, electric car, electric car, ship, spacecraft and the like. Among them, electric toy can include fixed or mobile electric toy, for example, game machine, electric car toy, electric ship toy and electric aircraft toy and the like, spacecraft can include aircraft, rocket, space shuttle and spacecraft and the like.

[0111] The electric equipment of the embodiments of the present application, the electric equipment can include device main body and power supply device, and the power supply device is used to supply power to the device main body, and the power supply device can include battery cell or battery pack. Device main body refers to the main structure that consumes electric energy to realize corresponding function. For example, the electric equipment can be mobile phone, and the device main body is the part that can realize communication function, and the part that can realize communication function is powered by battery cell or battery pack. For example, the electric equipment can be car, and the device main body is the part that can be used for people to ride and can run on the road, and the part that can be used for people to ride and can run on the road is powered by battery cell or battery pack. Power supply device refers to the device that can output electric energy. Exemplarily, electric energy can be output by battery pack composed of battery cell.

[0112] The following embodiments are described for convenience with a vehicle as an example of a kind of electric equipment of an embodiment of the present application.

[0113] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of the vehicle 1 in some embodiments of the present application. The 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. 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 serve 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 starting, navigating and operating power requirements of the vehicle 1 during driving.

[0114] In some embodiments of the present application, the battery device 10 can serve not only as an operating power source for the vehicle 1 , but also 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, and the 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 this 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, and 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 embodiment of the present application, a plurality of battery cells 100 may directly constitute a battery pack, or may first constitute a battery module, and then the battery module may constitute a battery pack.

[0116] Please refer to Figure 2 , Figure 2 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 housing 200, and the plurality of battery modules are housed inside the housing 200. The housing 200 is used to house the battery cells 100 to prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells 100. The housing 200 may be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as cuboids, cylinders, or spheres, and the embodiments of the present application do not limit this. The material of the housing 200 may be an alloy material such as aluminum alloy, iron alloy, or a polymer material such as polycarbonate, polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin, and the embodiments of the present application do not limit this.

[0117] In some embodiments, the box 200 can include a first box part 210 and a second box part 220, the first box part 210 and the second box part 220 are mutually coverable, and the first box part 210 and the second box part 220 jointly define a space for accommodating the battery monomer 100. The second box part 220 can be a hollow structure with one end open, and the first box part 210 can be a plate-shaped structure, the first box part 210 covers the open side of the second box part 220, so that the first box part 210 and the second box part 220 jointly define a space for accommodating the battery monomer 100. The first box part 210 and the second box part 220 can also be hollow structures with one side open, and the open side of the first box part 210 covers the open side of the second box part 220.

[0118] The battery module can include a plurality of battery monomers 100, the plurality of battery monomers 100 can be connected in series or in parallel or mixed connection to form a battery module, and the plurality of battery modules are connected in series or in parallel or mixed connection to form a battery. In this application, the battery monomer 100 can include lithium ion battery, sodium ion battery or magnesium ion battery, etc., and the embodiments of the present application are not limited thereto. The battery monomer 100 can be a cylinder, a flat body, a cuboid or other shapes, etc., and the embodiments of the present application are not limited thereto. The battery monomer 100 can be a cylinder, a flat body, a cuboid or other shapes, etc., and the embodiments of the present application are not limited thereto. For the sake of simplicity, the following embodiments are described with the square battery monomer as an example.

[0119] Please refer to Figure 3 , Figure 3 The exploded view of the battery monomer 100 in some embodiments of the present application. The battery monomer 100 refers to the smallest unit that constitutes the battery device 10. As Figure 3 , the battery monomer 100 includes a shell 110, an electrode assembly 120 and other functional components.

[0120] The outer shell 110 is a component used to form the internal environment of the battery cell 100. The outer shell 110 may include a shell 111 and an end cap 112. The shell 111 is a component used to cooperate with the end cap 112 to form the internal environment of the battery cell 100. The internal environment formed 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. An opening can be provided on the shell 111, and the end cap 112 is made to cover 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 inserted into the shell. When the interior of the shell 111 needs to be encapsulated, the end cap 112 is made to cover 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 based on 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 this embodiment of the present application does not impose any particular restrictions on this. The opening of the housing 111 can be located on the side or bottom of the housing 111, and this embodiment of the present application does not impose any particular restrictions on this.

[0121] The end cap 112 is a component that can be fitted over the opening of the housing 111 to isolate the internal environment of the battery cell 100 from the external environment. The shape of the end cap 112 can be adapted to the shape of the housing 111 to fit the housing 111. For example, the end cap 112 can be made of a material with a certain hardness and strength (such as an aluminum alloy). This prevents the end cap 112 from deforming when subjected to compression or collision, giving the battery cell 100 greater structural strength and improved safety. Functional components such as electrode terminals et can be provided on the end cap 112. The electrode terminals et can be used to electrically connect to the electrode assembly 120 for outputting or inputting electrical energy into the battery cell 100. In some embodiments, the end cap 112 can also be provided with a pressure relief mechanism for relieving 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 an injection port for injecting electrolyte into 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 cover 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 cover 112, and the insulating member can be used to isolate the electrical connection components in the shell 111 from the end cover 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 cover 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 of the electrode assembly 120 and the isolation member in the battery cell 100. The pressure relief mechanism may be in the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and may specifically be 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 the component within the battery cell 100 where the electrochemical reaction occurs. The housing 110 may contain one or more electrode assemblies 120. The electrode assembly 120 is primarily composed of a stacked positive and negative electrode sheets, typically with a separator between them. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 120, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative electrode tabs can be located together at one end of the main body or separately at either end, on the top or on the sidewalls of the main body, without specific limitations. During the charge and discharge process of the battery device 10, the positive and negative electrode active materials react with the electrolyte, and the tabs connect to the electrode terminals et to form a current circuit. The separator separates the positive and negative electrode sheets, preventing electrons from freely passing through the battery cell 100 while allowing ions in the electrolyte to flow freely between the positive and negative electrode sheets. 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 This is a flow chart of a method for manufacturing a battery cell in some embodiments of the present application. 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 the 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: providing a housing, and placing the electrode assembly into a receiving cavity of the housing to form a battery cell.

[0127] In step S110, it can be understood that the plurality of electrodes also include positive electrodes and negative electrodes, and the target electrode can be either a positive electrode or a negative electrode. The polarity of the target electrode is opposite to that of the adjacent electrode, and can be configured according to the polarity of the electrode adjacent to the target electrode, without specific limitation. Figure 5, the active layer H, the current collector J, the first film layer M1, and the second film layer M2 in the target electrode piece T are stacked in sequence. It can be understood that the term "stacked 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 electrode 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 electrode piece T.

[0128] Among them, the current collector is a component used to support the active layer, and its main function is to collect the current generated by the active layer in order to form a larger current for external output. Depending on the active layer supported, when supporting an active layer made of positive electrode active material, the current collector can be aluminum foil. When supporting 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 current collecting metal layers stacked on both sides of the intermediate layer, and the active layer is supported 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 typically formed by applying a slurry containing active materials to a current collector and then cold-pressing it. When the active layer is made from positive electrode active materials, these materials can include lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, nickel-cobalt-manganese ternary materials, and lithium nickel-cobalt-aluminum oxide. When the active layer is made from negative electrode active materials, these materials can include carbon negative electrode materials, tin-based negative electrode materials, lithium-containing transition metal nitride negative electrode materials, alloy-based negative electrode materials, and nanoscale negative electrode materials.

[0130] The portion of the current collector provided with the active layer and the active layer constitute the aforementioned main body, while the portion of the current collector not provided with the active layer constitutes the aforementioned tab (not shown). The structures of the positive and negative electrode sheets can be understood with reference to the target electrode sheet. Unlike the target electrode sheet, the positive and negative electrode sheets do not include the first and second film layers, and the active layer can be provided on both sides of the current collector of the positive and negative electrode sheets, without specific limitations 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 together, or after the multiple pole pieces are pressed together, and there is no specific limitation 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, the process of stacking multiple pole pieces can include the step of simultaneously providing the separator between adjacent pole pieces. When a separator is provided, whether the separator needs to be provided on the outermost pole piece can be determined based on whether the second film layer is removed or not. It can be provided according to the type of battery cell, and there is no specific limitation here.

[0132] In the process of stacking multiple electrode sheets, the approximate shape of the desired electrode assembly can be initially formed. The pressing process can make the electrode sheets in the electrode assembly closely contact each other, reduce the interface gap, and not only provide a smoother channel for the transmission of ions between the positive and negative electrodes, reduce the resistance to ion migration, but also improve the structural stability of the electrode assembly. In the formed electrode assembly, the two outermost electrode sheets can both be the target electrode sheets for removing the second film layer, or one of the two outermost electrode sheets can be the target electrode sheet for removing the second film layer, and no specific limitation is made here. For example, in combination with reference Figure 5 ,by Figure 6 For example, Figure 6 This is a schematic diagram of the cross-sectional structure of the electrode assembly 120 in some embodiments of the present application, illustrating that 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 FIG. 1 , 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, and 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 provided on one side of the current collector in the target pole piece, and the first film layer and the second film layer are provided on the other side of the current collector, compared with the method of providing 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 stacking and pressing, thereby improving the mechanical performance 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 and thus improve the electrical performance of the battery, but it can also improve the surface quality of the target pole piece. In addition, compared with the method of providing 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 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 provided on the target pole piece, it will be difficult to take into account both the energy density and support requirements of the battery. If a related removable support structure is provided 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 provided 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 improve the surface quality of the target pole piece while taking into account both the energy density and support requirements of the battery by controlling the materials of the first film layer and the second film layer, and the matching method of the first film layer and the second film layer.

[0136] According to some embodiments of this application, please refer to Figure 7 , Figure 7 This is a flow chart of providing a target electrode piece in some embodiments of the present application. Providing a plurality of electrode pieces includes providing a target electrode piece. Providing a target electrode 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 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 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 provided on one side of the current collector strip, and an initial first film layer provided on a side of the current collector strip facing away from the initial active layer;

[0138] attaching the second strip material to the first strip material to form the initial active layer, the current collector strip material, the initial first film layer and the initial second film layer arranged in a stack;

[0139] cutting the first strip material and the second strip material after the attachment to form the target pole piece.

[0140] In step S111a, the first strip material and the second strip material are usually components in a roll or a strip. In the manufacturing process, the strip materials can be continuously conveyed and processed, so that the required components can be formed.

[0141] The initial active layer is a layer structure for forming an active layer on the target pole piece obtained by the cutting process, the initial first film layer is a layer structure for forming a first film layer on the target pole piece obtained by the cutting process, and the initial second film layer is a layer structure for forming a second film layer on the target pole piece obtained by the cutting process. For example, Figure 8 and Figure 9 For example, Figure 8 is a schematic side view of the first strip material D1 in some embodiments of the present application, Figure 9 is a schematic side view of the second strip material D2 in some embodiments of the present application, illustrating a case where the first strip material D1 is configured as a pole piece strip material D1a, the second strip material D2 is configured as a film layer set strip material D2a, the pole piece strip material D1a includes a current collector strip material D11a and an initial active layer D12a disposed on one side of the current collector strip material D11a, and the film layer set strip material D2a includes an initial first film layer D21a and an initial second film layer D22a arranged in a stack. For example, Figure 10 and Figure 11 For example, Figure 10 is a schematic side view of the first strip material D1 in some embodiments of the present application, Figure 11 is a schematic side view of the second strip material D2 in some embodiments of the present application, illustrating a case where the first strip material D1 is configured as a pole piece strip material D1b, the second strip material D2 is configured as a film layer strip material D2b for forming an initial second film layer, and the pole piece strip material D1b includes a current collector strip material D11b, an initial active layer D12b disposed on one side of the current collector strip material D11b, and an initial first film layer D13b disposed on the side of the current collector strip material D11b away from the initial active layer D12b.

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

[0143] In step S111c, the attached first and second strips can be cut into the desired target electrode size through a slitting process to produce the target electrode. During the continuous strip attachment process, the slitting process can also maximize material utilization 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 method.

[0144] Because the attached first and second tapes comprise an initial first film layer and an initial second film layer before slitting to form the target electrode sheets, they provide support for the current collector tape, thereby reducing curling or warping of the target electrode sheets during slitting and further improving the quality of lamination and lamination. By using the initial first and second film layers as the second tape, the materials of the initial first and second film layers can be tailored to suit different performance requirements, thereby enhancing the performance of the target electrode sheets. By using the initial first film layer, current collector tape, and initial active layer as the first tape (also known as the electrode sheet tape) and the initial second film layer as the second tape, the electrode sheet tape already possesses a certain degree of integrity before being attached to the second tape, allowing the initial first film layer to protect the electrode sheet. Furthermore, by providing a first and second tape, only the first and second tapes need to be attached during the manufacturing process, improving production efficiency.

[0145] According to some embodiments of this application, please refer to Figure 12 , Figure 12 This is a flow diagram of step S111b in some embodiments of the present application, wherein the second tape is attached 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 and the second tape are connected to each other, so as to form an adhesive layer on at least one side where the first tape and the second tape are connected to each other;

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

[0148] In step SG, the glue spraying process can be performed on the side of the first strip material that is connected to the second strip material, or on the side of the second strip material that is connected to the first strip material, or on the side of the first strip material that is connected to the second strip material and on the side of the second strip material that is connected to the first strip material. No specific restrictions are made here.

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

[0150] In this way, due to the adhesive layer's certain bonding strength, the first and second strips can be relatively fixed, thus facilitating the subsequent slitting and attaching of the first and second strips. Furthermore, compared to other attachment methods (such as hot pressing), this method is also easier to manufacture. When the second strip is configured as a film strip for forming the initial second film layer, it also facilitates the subsequent removal of the second film layer from the target electrode.

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

[0152] Step SI, adjusting the tension of the first belt material through the adjustment mechanism; along the conveying direction of the first belt material, the adjustment mechanism is located upstream of the initial position where the first belt material and the second belt material are attached.

[0153] In step S1, the adjustment mechanism is used to control the tension of the first web. Adjustment methods of the adjustment mechanism include, but are not limited to, changing the path length of the first web and adjusting the pressure of the pressure roller on the first web. For example, by adjusting the position of the guide roller, the path length of the first web is changed, thereby indirectly adjusting the tension of the first web. Alternatively, by adjusting the pressure of the pressure roller on the first web, the tension of the first web can also be controlled. The location, structure, and adjustment method of the adjustment mechanism are not specifically limited herein.

[0154] Compared with the method of adjusting the winding speed of the first belt material (for example, adjusting the winding speed of the first belt material by changing the rotation speed of the motor), since the adjustment mechanism is located upstream of the initial position where the first belt material and the second belt material 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 the 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, and further helping to improve the electrical performance and safety performance of the battery.

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

[0157] Step SJ: rolling the first tape and the second tape by a pressing roller 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 strip material; 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 and second webs to each other after the first pressing roller unit is satisfactory, then subsequent pressing roller units may not be used. If the attachment of the first and second webs to each other after the first pressing roller unit is not satisfactory, then subsequent pressing roller units may be used. Of course, multiple pressing roller units may also be used to perform multiple pressing operations on the webs. The use of multiple pressing roller units is not specifically limited herein.

[0162] By providing multiple pressing roller units and ensuring that at least one is in use, the web can be selectively pressed once or multiple times, depending on the web material. By providing multiple pressing roller units with at least two different pressure levels, the pressure can be tailored to the specific characteristics of the web material. This not only improves the attachment effect but also helps control production costs.

[0163] According to some embodiments of this application, please refer to Figure 15 , Figure 15 This is a flow chart of step S120 in some embodiments of the present application, wherein a plurality of electrode sheets are stacked, pressed, and the second film layer is removed to form an electrode assembly (i.e., step S120), including:

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

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

[0166] Step S123a: remove the second film layer in the second assembly to form an electrode assembly.

[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 conducive to improving the lamination effect.

[0168] According to some embodiments of this application, please refer to Figure 16 , Figure 16 This is a flow diagram of step S120 in some other embodiments of the present application, wherein a plurality of electrode sheets are stacked, pressed, and the second film layer is removed to form an electrode assembly (i.e., step S120), including:

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

[0170] Step S122b: stacking a plurality of electrode sheets and pressing them together to form an electrode assembly.

[0171] In this way, 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 can include adhesive 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 holds together layers or structures of different materials. The relatively low adhesion between the second layer and the first makes it easier to remove the second layer when needed, reducing the risk of damaging the connection between the first 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 Figure 17 , Figure 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 a first thickness d1, the thickness of the second film layer M2 is a 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 can 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 can be set according to the specific use case and is not specifically limited here. For example, the upper limit of the sum of the first thickness d1 and the second thickness d2 can be 0.55 mm or 1 mm.

[0180] It should be noted that, for the convenience of explaining and illustrating the first film layer M1 and the second film layer M2, Figure 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 the improvement of the subsequent pressing quality.

[0182] According to some embodiments of this application, please continue to refer to Figure 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, not only can a certain degree of support performance be provided for the current collector J of the target electrode piece, but it can also facilitate manufacturing while making the thickness of the formed electrode assembly 120 smaller, which is beneficial to improving the energy density of the battery. By controlling the thickness of the second film layer M2, not only can the support effect for the current collector J of the target electrode piece be further improved, but it can also facilitate manufacturing while making the thickness of the first film layer M1 smaller, which is beneficial to improving the energy density of the battery.

[0185] According to some embodiments of this application, please continue to refer to Figure 17 The orthographic projection of the first film layer M1 on the reference surface is within the range of the orthographic projection of the second film layer M2 on the reference surface. The reference surface is perpendicular to the thickness direction Z of the target electrode. 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 surface and the outer contour of the orthographic projection of the second film layer M2 on the reference surface.

[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 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 , it is advantageous to remove the second film layer M2 by utilizing the portion of the second film layer M2 that exceeds the first film layer M1 in the step of removing the second film layer M2 .

[0188] According to some embodiments of this application, please continue to refer to Figure 17 Along the width direction W of the target electrode 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 electrode piece is perpendicular to the thickness direction Z of the target electrode piece.

[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 Figure 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. This makes it 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, thereby facilitating 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, thereby facilitating support and facilitating removal.

[0194] According to some embodiments of this application, please continue to refer to Figure 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, Figure 17 The figure shows a case where 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. Alternatively, 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, without any specific limitation herein.

[0196] In this way, the first film layer M1 and the second film layer M2 can be configured with a single-layer structure or a multi-layer structure according to different usage requirements. If the corresponding film layer is a single-layer structure, the production process of the film layer can be simplified. If 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 Figure 18 , Figure 18 This is a structural diagram 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 the 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 multiple electrode sheets 121 for the entire battery processing process. 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 electrode sheets 121. The conveying mechanism may be a conveyor belt, a robotic arm, etc. The conveying mechanism can remove the electrode sheets 121 from the storage unit and convey them to a designated location. Of course, the providing device 1100 may also not include a storage unit, and this is not specifically limited 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 stacked alternately. The pressing process is to apply a certain pressure to make the stacked pole pieces 121 tightly combined, thereby enhancing 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 may stack the multiple pole pieces 121 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 may be improved by controlling the temperature.

[0200] The removal device 1300 is a device for removing the second film layer M2 on the target electrode 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, thermal peeling or chemical dissolution. For example, the second film layer M2 can be removed from the target electrode 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 restrictions are 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 accommodating 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 there is no specific limitation here. Exemplarily, the shell loading device 1400 may include a gripping mechanism, a positioning mechanism and a shell loading mechanism. The gripping mechanism can use a robotic arm or a vacuum suction cup to grab 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 accommodating cavity of the shell 110 and the electrode assembly 120. The shell loading mechanism can place the electrode assembly 120 into the accommodating cavity of the shell 110.

[0202] Thus, by providing a plurality of pole pieces 121 including a target pole piece T, the providing device 1100 provides an active layer H on one side of the current collector J in the target pole piece T, and a first film layer M1 and a second film layer M2 on the other side of the current collector J. Compared with the method of setting the active layer H on one side of the current collector J of the target pole piece T, it is beneficial to use the first film layer M1 and the second film layer M2 to improve the stress condition of the target pole piece T, 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 safety risks. 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 improving the energy density and thus improving the electrical performance of the battery. In addition, compared with the method of setting 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. As a result, 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 Figure 18 , and combined with reference Figure 19 , Figure 19 11 is a schematic structural diagram of a first providing mechanism 1110 in some embodiments of the present application. The providing device 1100 includes a 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 a first strip of material D1. The second unwinding mechanism 1112 is configured to provide a second strip of material D2. For example, the first unwinding mechanism 1111 may include a reel and a drive motor. The reel may be used to carry the first strip of material. The drive motor provides rotational power to the reel, enabling it to rotate and release the first strip of material D1. The second unwinding mechanism 1112 can be understood with reference to the first unwinding mechanism 1111 and is not described in detail here.

[0205] The first strip D1 is configured as a pole piece strip, and the second strip D2 is configured as a film layer assembly 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 assembly strip includes an initial first film layer and an initial second film layer stacked together. Alternatively, the first strip D1 is configured as a pole piece strip, and 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 disposed on one side of the current collector strip, and an initial first film layer disposed on a side of the current collector strip facing away from the initial active layer. For the relevant implementations and advantages of the first and second strips D1 and D2, please refer to the contents illustrated in some of the aforementioned embodiments and 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 by 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 and second strips D1 and D2 passing through are tightly fitted 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 attached first strip D1 and the second strip D2 to form a target pole piece T. Exemplarily, the cutting mechanism 1114 can be cut by a tool or a laser beam. Furthermore, the cutting mechanism 1114 can also include positioning and measuring components, which can control the cutting size to obtain a target pole piece T of a required size. When the cutting mechanism 1114 cuts the attached first strip D1 and the second strip D2, 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 having the active layer H only on one side, thereby improving the warping and curling of the target pole piece T.

[0208] By providing the first unwinding mechanism 1111 and the second unwinding mechanism 1112, continuous feeding of the first and second strips D1 and D2 can be achieved. Furthermore, since the attachment mechanism 1113 is located downstream of the first and second unwinding mechanisms 1111 and 1112, and the cutting mechanism 1114 is located downstream of the attachment mechanism 1113, a continuous production arrangement is formed, thereby improving production efficiency. The advantages brought about by the configuration of the first and second strips D1 and D2 can be referred to the advantages illustrated in the aforementioned embodiments and will not be elaborated upon here.

[0209] According to some embodiments of this application, please continue to refer to Figure 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 adhesive material on the surface of the corresponding strip. For example, the glue spraying mechanism 1115 can spray the adhesive material on the side where the first strip D1 and the second strip D2 need to be attached through a nozzle or other related structure, without specific limitation.

[0211] By providing the glue spraying mechanism 1115, an adhesive layer can be formed on at least one of the surfaces where the first and second strips D1 and D2 are attached to each other before the first and second strips D1 and D2 are attached. This helps to improve the firmness of the attachment between the first and second strips D1 and D2 during the attachment process. Furthermore, because the glue spraying mechanism 1115 is located upstream of the attachment mechanism 1113, it facilitates a continuous production process with the subsequent attachment mechanism 1113, thereby improving production efficiency.

[0212] According to some embodiments of this application, please continue to refer to Figure 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 web D1.

[0213] The relevant implementations of the adjustment mechanism 1116 can 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, and thus 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 Figure 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 is configured to press the first and second strips D1 and D2 .

[0216] Exemplarily, the pressing roller mechanism G may include a pressing roller, a drive component, and a pressure adjustment element. After the first and second webs D1 and D2 are conveyed from the first and second unwinding mechanisms 1111 and 1112, they enter the pressing roller mechanism G. Driven by the drive component, the pressing roller rotates, and under the pressure applied by the pressure adjustment device, it presses the first and second webs D1 and D2 as they pass through. The friction between the pressing roller and the webs keeps the webs conveyed, while the pressure forces the first and second webs D1 and D2 tightly together, achieving 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 Figure 19 The pressing roller mechanism G includes a plurality of pressing roller units G1 arranged along the conveying direction of the first web D1. At least one of the plurality of pressing roller units G1 is in use; and / or the pressing roller units G1 are configured to provide a roller pressure, with the plurality of pressing roller units G1 providing roller pressures of at least two different magnitudes.

[0219] The advantages of the plurality of pressing roller units G1 illustrated in the aforementioned embodiments can be understood, and will not be described in detail here. Figure 19 In the figure, the situation that two pressing roller units G1 are provided is illustrated. 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 Figure 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 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 D1 and D2 after attachment.

[0221] The deflection correction mechanism 1117 is used to position the attached first and second strips D1 and D2 in the desired position. Exemplarily, the deflection correction mechanism 1117 can include a position sensor that can monitor the edge position of the strip or the corresponding marking position in real time and feed the actual position information of the strip to a corresponding controller. The controller can then compare the information fed back by the position sensor with the preset position to determine the offset. For example, if the position sensor detects that the attached first and second strips D1 and D2 are offset to the left, the deflection correction mechanism 1117 can adjust the attached first and second strips D1 and D2 to the right. This is not a specific limitation.

[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 rotational 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 adjustment may also be achieved by changing the transmission ratio of the strips, such as adjusting the transmission ratio of a pulley or gear. No specific limitation is imposed herein.

[0223] The strip material after attachment may be positionally offset due to deviations during the attachment process or interference during the transmission process. By setting up a correction mechanism 1117, the occurrence of the aforementioned positional offset can be reduced, which is beneficial for the subsequent cutting out 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 material can be flexibly adjusted by setting up an adjustment mechanism 1118, so that the attached first strip material D1 and the second strip material D2 enter the cutting mechanism 1114 at the required speed, which is beneficial for the cutting mechanism 1114 to cut the attached first strip material D1 and the second strip material D2, and thus can improve the cutting quality. Furthermore, the 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 conjunction 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 、 Figure 9 、 Figure 18 and Figure 19 The manufacturing method of the battery cell 100 includes the following steps:

[0226] First, a first strip D1 is unwound by a first unwinding mechanism 1111, and a second strip D2 is unwound by a second unwinding mechanism 1112. A glue spraying process is performed on one side of the second strip D2 attached to the first strip D1 by a glue spraying mechanism 1115 to form a viscous layer. 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 provided on one side of the current collector strip D11a. The film layer group strip D2a includes an initial first film layer D21a and an initial second film layer D22a stacked together. 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, thereby forming a stacked initial active layer, a current collector strip, an initial first film layer, and an initial second film layer.

[0228] Then, the first strip D1 and the second strip D2 after being attached are subjected to slitting processing by the slitting mechanism 1114 to form the target tab T.

[0229] Subsequently, the plurality of tabs 121 are laminated and subjected to compression processing by the molding device 1200, and the second film layer M2 on the target tab T is removed by the removal device 1300 to obtain an electrode assembly 120; in the electrode assembly 120, the two tabs 121 located at the outermost sides are target tabs T from which the second film layer M2 is removed, and the active layer H of the target tab T faces the adjacent tab 121;

[0230] Then, the electrode assembly 120 is loaded into the accommodating cavity of the shell 110 by the shell loading device 1400 to form the battery monomer 100.

[0231] In the manufacturing method of the battery monomer 100 as described above, the tension of the first strip D1 can be adjusted by the adjusting mechanism 1116, the rolling mode of the different compression roller units G1 can be configured, the deviation can be corrected by the deviation correcting mechanism 1117, and the conveying speed of the first strip D1 and the second strip D2 after being attached can be adjusted by the adjusting mechanism 1118 according to actual conditions, which is not specifically limited herein. In addition, a plurality of conveying rollers S can be arranged on the conveying path of the strip to cooperate with the conveying of the corresponding strip.

[0232] It should be understood that the above-mentioned various steps are not necessarily executed in the order shown. Unless otherwise stated in the embodiments of the present application, the execution of these steps does not have strict order restrictions, and these steps can be executed in other orders. Moreover, at least a part of the steps can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily sequential, but can be executed in rotation or alternation with other steps or steps or stages in other steps. For example, for the step of "laminating and compressing the plurality of tabs and removing the second film layer", it can be laminated and compressed first, and then removed, or it can be removed first, and then laminated and compressed, or it can be laminated first, then removed, and then compressed. This is not specifically limited herein.

[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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions 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: Provide multiple pole pieces; The plurality of pole pieces include a target pole piece, the target pole piece including an active layer, a current collector, a first film layer, and a second film layer stacked in sequence, the sum of the thickness of the first film layer and the thickness of the second film layer being greater than or equal to 0.1 mm, the thickness of the first film layer being less than or equal to 0.05 mm, and the thickness of the second film layer being greater than or equal to 0.05 mm; The steps of stacking and laminating the plurality of electrode sheets are sequentially performed, and the step of removing the second film layer is inserted during the steps to form an electrode assembly; in the electrode assembly, at least one of the two outermost electrode sheets is the 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; A housing is provided, and the electrode assembly is installed in a receiving cavity of the housing to form a battery cell.

2. The method for manufacturing a battery cell according to claim 1, wherein: Providing a plurality of pole pieces includes providing the target pole piece, and providing 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, 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 facing 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 membrane layer, and an initial second membrane layer; The attached first and second strips are cut to form the target pole pieces.

3. The method for manufacturing a battery cell according to claim 2, wherein: 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, wherein: 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 and the second belt material are attached.

5. The method for manufacturing a battery cell according to claim 2, wherein: Attaching the second tape to the first tape comprises: The first and second tape materials are rolled by a roller mechanism to attach the second tape material to the first tape material.

6. The method for manufacturing a battery cell according to claim 5, wherein: 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; wherein at least one of the plurality of pressing roller units is in use; and / or The pressing roller unit is configured to provide a roller pressure, and the roller pressures corresponding to the plurality of pressing 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 steps of sequentially stacking and laminating the plurality of electrode sheets and inserting a step of removing the second film layer during the steps to form an electrode assembly include: 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 steps of sequentially stacking and laminating the plurality of electrode sheets and inserting a step of removing the second film layer during the steps to form an electrode assembly include: removing the second film layer on the target electrode; The plurality of electrode sheets 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, wherein: 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 orthographic projection of the first film layer on the reference surface is located within the orthographic projection range of the second film layer on the reference surface; the reference surface is perpendicular to the thickness direction of the target electrode; 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.

12. The method for manufacturing a battery cell according to claim 11, wherein: Along the width direction of the target electrode, 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.

13. 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.

14. 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.

15. 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, and 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 electrode sheets, and the removing device is configured to remove the second film layer on the target electrode sheet to form an electrode assembly; in the electrode assembly, at least one of the two outermost electrode sheets is the target electrode sheet, and the active layer of the target electrode sheet is arranged toward the adjacent electrode sheet; and The housing device is configured to be used for housing the electrode assembly into the accommodating cavity of the housing.

16. The battery processing equipment according to claim 15, characterized in that The providing device includes a first providing mechanism; the first providing mechanism includes: 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 tape and the second tape; and a cutting mechanism located downstream of the attaching mechanism; the cutting mechanism is configured to cut the attached first strip and the second strip into pieces to form the target pole pieces; 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 provided 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.

17. The battery processing equipment according to claim 16, characterized in that 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 and second strips are attached to each other.

18. The battery processing equipment according to claim 16, characterized in that The first providing mechanism further 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 tape.

19. The battery processing equipment according to claim 16, 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 is configured to roll the first strip material and the second strip material.

20. The battery processing equipment according to claim 19, characterized in that 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; wherein at least one of the plurality of pressing roller units is in use; and / or The pressing roller unit is configured to provide a roller pressure, and the roller pressures corresponding to the plurality of pressing roller units have at least two sizes of roller pressures.

21. The battery processing equipment according to claim 16, characterized in that The first providing mechanism further includes a deflection correcting mechanism, the deflection correcting mechanism being located downstream of the attaching mechanism and upstream of the cutting mechanism, the deflection correcting mechanism being configured to correct the deflection of the first and second tapes after attachment; and / or The first providing mechanism further includes an adjusting mechanism located downstream of the attaching mechanism and upstream of the cutting mechanism, and the adjusting mechanism is configured to adjust a conveying speed of the attached first and second tapes.

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