Battery material strip laminating apparatus and battery manufacturing system

Abstract

The present application relates to the technical field of battery manufacturing, and provides a battery material strip laminating apparatus and a battery manufacturing system. The battery material strip laminating apparatus comprises: a frame; a flattening roller, the flattening roller being rotatably arranged on the frame and being used for flattening a first material strip, a first group of helical recesses and a second group of helical recesses being provided on a circumferential side surface of the flattening roller, and the first group of helical recesses and the second group of helical recesses rotating and extending from the middle of the flattening roller toward the two ends of the flattening roller in opposite helical directions, respectively; and a laminating roller set, the laminating roller set being rotatably arranged on the frame and being configured to perform roller lamination on a second material strip and the flattened first material strip.

Description

Battery material strip composite device and battery manufacturing system

[0001] Cross-references

[0002] This application refers to Chinese Patent Application No. 202420433358.2, filed on March 6, 2024, entitled “Battery Material Strip Composite Device and Battery Manufacturing System”, which is incorporated into this application in its entirety by reference. Technical Field

[0003] The present application relates to the field of battery manufacturing technology, and in particular to a battery material strip composite device and a battery manufacturing system. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0005] During the battery manufacturing process, composite current collectors can be produced through thermal lamination. The multiple layers of a composite current collector include a separator layer. This separator layer is typically thin and made of a relatively soft material. During the thermal lamination process with the metal layer, the separator layer can easily wrinkle, resulting in an overall diagonal stripe pattern. This is primarily due to the separator layer's shrinkage during heating and the potential for air to enter the separator layer during lamination with the roller, creating bubbles. Such anomalies can affect product adhesion and lead to low product yields. Summary of the Invention

[0006] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide a battery strip composite device and a battery manufacturing system to improve the product yield of the composite strip.

[0007] An embodiment of the first aspect of the present application provides a battery material strip composite device, comprising: a frame; a flattening roller, which is rotatably arranged on the frame and is used to flatten a first material strip, wherein the circumferential surface of the flattening roller has a first group of spiral grooves and a second group of spiral grooves, and the first group of spiral grooves and the second group of spiral grooves rotate and extend from the middle of the flattening roller to both ends of the flattening roller in opposite spiral directions; and a composite roller group, which is rotatably arranged on the frame and is configured to roll-combine the second material strip with the flattened first material strip.

[0008] In the technical solution of the embodiments of this application, when the first strip of material contacts the flattening rollers, two sets of spiral grooves on the flattening rollers, extending in opposite spiral directions, apply forces in different directions to the first strip of material, thereby flattening the first strip. After being flattened by the flattening rollers, the first strip of material is then combined with the second strip of material by rolling on the composite roller set. Because the first strip of material has already been flattened, wrinkles and diagonal streaks are reduced, making the first strip as smooth as possible. Consequently, the product yield of the composite strip is improved.

[0009] In some embodiments, the first and second sets of spiral grooves of the flattening roller intersect at a preset angle in the middle of the flattening roller. Because the first and second sets of spiral grooves intersect at a preset angle in the middle of the flattening roller, when the first strip contacts the flattening roller, the first strip can be simultaneously unwound from a position corresponding to the intersection in the middle to both sides, thereby reducing the uneven flattening degree on both sides of the strip and further improving the flattening effect of the flattening roller.

[0010] In some embodiments, the preset angle is in the range of 20 to 60 degrees. By setting the preset angle in the range of 20 to 60 degrees, the flattening effect of the flattening roller on the material strip can be further improved.

[0011] In some embodiments, the flattening roller is rotated in such a way that the intersection of the first and second sets of spiral grooves of the flattening roller contacts the first material strip before any other portion of the first or second sets of spiral grooves. This can further enhance the flattening effect of the flattening roller on the material strip.

[0012] In some embodiments, an anti-slip layer may be provided in the first and second sets of spiral grooves. Due to the high friction coefficient between the anti-slip layer in the grooves and the material strip, the resulting anti-slip effect can improve the flattening effect of the material strip.

[0013] In some embodiments, the outer surface of the anti-slip layer is flush with the portion of the circumferential surface of the flattening roller that is not provided with the first and second sets of spiral grooves. Consequently, when the first strip contacts the flattening roller, it not only contacts the anti-slip layer but also contacts the portion of the circumferential surface of the flattening roller that is not provided with the first and second sets of spiral grooves. In other words, the first strip can contact as much of the entire surface of the flattening roller as possible, thereby reducing or avoiding the problem of the strip not being properly flattened due to unevenness on the flattening roller surface.

[0014] In some embodiments, the first and second sets of spiral grooves have conical cross-sections. The conical cross-sections facilitate easier filling of the anti-slip layer into the grooves and reduce the amount of anti-slip layer material used, as the conical tips at the bottom of the grooves require less anti-slip layer material.

[0015] In some embodiments, a distance between two adjacent grooves in the first set of spiral grooves is in the range of 3-5 mm, and a distance between two adjacent grooves in the second set of spiral grooves is in the range of 3-5 mm.

[0016] In some embodiments, the laminating roller set includes a first roller and a second roller arranged parallel to the first roller, with the circumferential surfaces of the first roller and the second roller facing each other to perform roll-compression lamination on the second material strip and the flattened first material strip, and at least one of the first roller and the second roller is a heated roller. This can further improve the efficiency of heated rolling.

[0017] In some embodiments, the first roller is a heated roller, and a flattening roller is positioned to one side of the heated roller to flatten the first material strip heated by the heated roller. Thus, the first material strip is first heated by the first roller, then flattened by the flattening roller. After being flattened, it is then hot-pressed and laminated with the second material strip through the gap between the first and second rollers. This allows for a compact layout while also enabling the reuse of the heated roller (i.e., the first roller).

[0018] An embodiment of the second aspect of the present application provides a battery manufacturing system, including the battery strip lamination apparatus according to the first aspect of the present application. Because the first strip is flattened before being laminated with the second strip, wrinkles and diagonal streaks are reduced. Accordingly, a battery manufacturing system including the battery strip lamination apparatus can further improve the yield of the produced batteries.

[0019] 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

[0020] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the drawings without paying creative work.

[0021] FIG1 is a schematic structural diagram of a battery strip composite device according to some embodiments of the present application;

[0022] FIG2 is a schematic structural diagram of a flattening roller in a battery strip laminating device according to some embodiments of the present application;

[0023] FIG3 is a schematic cross-sectional view of a flattening roller in a battery strip composite device according to some embodiments of the present application.

[0024] Explanation of the accompanying drawings: 100, battery material strip composite device; 110, flattening roller; 111, first group of spiral grooves; 112, second group of spiral grooves; 113, portion of the circumferential side surface of the flattening roller where the first group of spiral grooves and the second group of spiral grooves are not provided; 114, anti-slip layer; 120, composite roller group; 121, first roller; 122, second roller; 901, first material strip; 902, second material strip. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0030] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0031] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0032] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0033] As mentioned above, in the process of heating and compounding the diaphragm layer and the metal layer, the diaphragm layer is prone to wrinkling, resulting in oblique stripes on the composite current collector as a whole. For example, the substrate of the composite current collector can be a PET diaphragm layer, and both sides of the PET diaphragm layer can be coated with glue. When the glue-coated PET diaphragm layer is thermally compounded with the metal coating on one side, wrinkling is likely to occur. The main reason is that the roller carrying the PET diaphragm layer has a relatively high temperature (60°C to 100°C) during operation. The PET diaphragm layer will shrink when it is running on the surface of the roller. When the PET diaphragm layer and the coated metal are compounded at the hot pressing roller, wrinkles will appear on the film surface. Such abnormalities will affect the adhesion of the product and result in low product yield.

[0034] In view of this, embodiments of the present application provide a battery material strip composite device and a battery manufacturing system.

[0035] The battery strip laminating device disclosed in the embodiments of this application can be used in battery production and manufacturing, for example, to flatten the adhesive layer and polyethylene terephthalate (PET) separator layer of a composite current collector. Furthermore, the battery strip laminating device disclosed in the embodiments of this application can also be used in other fields to flatten and laminate film products.

[0036] Embodiments of the present application provide a battery material strip composite device. Figure 1 is a schematic diagram of the structure of a battery material strip composite device 100 in some embodiments of the present application, Figure 2 is a schematic diagram of the structure of a flattening roller in the battery material strip composite device in some embodiments of the present application, and Figure 3 is a cross-sectional schematic diagram of the flattening roller in the battery material strip composite device in some embodiments of the present application. Referring to Figure 1, an embodiment of the present application provides a battery material strip composite device 100, which includes a frame, a flattening roller 110, and a composite roller group 120.

[0037] The frame can be a frame or base of the battery material strip composite device, or it can be a part of the frame or base, or it can be other supporting structures. It will be understood that for the sake of simplicity of illustration, the frame is not shown in Figure 1. The flattening roller 110 can be rotatably set on the frame for flattening the first material strip 901. Continuing to refer to Figure 2, the circumferential surface of the flattening roller 110 has a first group of spiral grooves 111 and a second group of spiral grooves 112, and the first group of spiral grooves 111 and the second group of spiral grooves 112 rotate and extend from the middle of the flattening roller 110 to the two ends of the flattening roller 110 in opposite spiral directions. The composite roller group 120 can be rotatably set on the frame and is configured to roll-compound the second material strip 902 with the flattened first material strip 901.

[0038] In this example, the flattening roller 110 can be an entire cylindrical structure. It can be solid or hollow. It can be made of stainless steel or ceramic. Furthermore, the flattening roller 110 can be rotatably mounted on a frame via a rotating shaft. It will be appreciated that the rotation of the flattening roller 110 relative to the frame can be driven by a motor, which can be located on the frame. When the flattening roller 110 is in operation, the first material strip 901 can be pressed against the flattening roller 110 under a certain pulling force.

[0039] The first set of spiral grooves 111 and the second set of spiral grooves 112 can each include multiple spiral grooves, and the multiple spiral grooves in each set of spiral grooves can be spaced a certain distance apart. As shown in FIG2 , the first set of spiral grooves 111 and the second set of spiral grooves 112 extend in opposite spiral directions, respectively, from the center of the flattening roller 110 toward both ends of the flattening roller 110. In this example, the center of the flattening roller 110 can be the middle of the flattening roller 110 along its longitudinal axis, or near the middle.

[0040] In the example, as shown in Figure 1, the first material strip 901 can be a composite layer of an adhesive layer 911 and a PET diaphragm layer 912, and the second material strip 902 can be a metal layer 913. Accordingly, the first material strip 901 and the second material strip 902 are composited to form a composite layer structure of a metal layer 913-adhesive layer 911-PET diaphragm layer 912.

[0041] Therefore, when the first strip 901 contacts the flattening roller 110, the two sets of spiral grooves on the flattening roller 110, extending in opposite spiral directions, can apply forces in different directions to the first strip 901, thereby flattening the first strip 901. After being flattened by the flattening roller 110, the first strip 901 and the second strip 902 are rolled together by the laminating roller set 120 to form a composite. Because the first strip 901 has already been flattened, wrinkles and diagonal streaks are reduced, making the first strip 901 as smooth as possible. This, in turn, improves the product yield of the composite strips.

[0042] In some embodiments, the first set of spiral grooves 111 and the second set of spiral grooves 112 of the flattening roller 110 intersect at a predetermined angle at the middle of the flattening roller 110 .

[0043] As can be seen from FIG2 , the first set of spiral grooves 111 and the second set of spiral grooves 112 intersect in a V-shape at the middle portion of the flattening roller 110. For example, a spiral groove in the first set of spiral grooves 111 and a corresponding spiral groove in the second set of spiral grooves 112 may intersect at a predetermined angle to form a V-shape.

[0044] Since the first group of spiral grooves 111 and the second group of spiral grooves 112 intersect at a preset angle in the middle of the flattening roller 110, when the first material strip 901 contacts the flattening roller 110, the first material strip 901 can be synchronously unfolded to both sides from the position corresponding to the intersection position in the middle, thereby reducing the inconsistent flattening degree on both sides of the material strip, thereby further improving the flattening effect of the flattening roller.

[0045] In some embodiments, the preset angle is in the range of 20 to 60 degrees.

[0046] The preset angle refers to the acute angle between two intersecting grooves. As shown in Figure 2 , this angle can be in the range of 20 to 60 degrees. Specifically, a groove in the first set of spiral grooves 111 can be 10 to 30 degrees away from the rotational direction of the flattening roller 110; and a groove in the second set of spiral grooves 112 can be 10 to 30 degrees away from the rotational direction of the flattening roller 110.

[0047] In an example, the preset angle may be in the range of 30 to 60 degrees.

[0048] In an example, the preset angle may be in the range of 40 to 60 degrees.

[0049] In an example, the preset angle can be 20 degrees, 22 degrees, 24 degrees, 25 degrees, 26 degrees, 28 degrees, 30 degrees, 32 degrees, 34 degrees, 35 degrees, 36 degrees, 38 degrees, 40 degrees, 42 degrees, 44 degrees, 45 degrees, 46 degrees, 48 ​​degrees, 50 degrees, 52 degrees, 54 degrees, 55 degrees, 56 degrees, 58 degrees or 60 degrees.

[0050] By setting the preset angle within the range of 20 to 60 degrees, the flattening effect of the flattening roller 110 on the material strip can be further improved.

[0051] In some embodiments, the rotation direction of the flattening roller can be set so that the intersection position of the first set of spiral grooves 111 and the second set of spiral grooves 112 of the flattening roller 110 contacts the first material strip before other parts of the first set of spiral grooves 111 or the second set of spiral grooves 112.

[0052] In an example, the rotation direction of the flattening roller can be set so that the intersection position of the first set of spiral grooves 111 and the second set of spiral grooves 112 of the flattening roller 110 (i.e., the bottom tip of the formed "V" shape) is the position where the corresponding pair of grooves forming the "V" shape first contacts the first material strip 901. In other words, for the first material strip 901, the bottom tip of the "V" shape on the flattening roller 110 will contact the first material strip 901 before the two top ends of the "V" shape.

[0053] In this way, the flattening effect of the flattening roller 110 on the strip can be further improved.

[0054] In some embodiments, an anti-slip layer 114 may be provided in the first group of spiral grooves 111 and the second group of spiral grooves 112 .

[0055] In an example, the friction coefficient of the material of the anti-slip layer 114 may be higher than the friction coefficient of the portion of the flattening roller 110 where no grooves are provided. For example, the material of the anti-slip layer 114 may be polyurethane or other known plastic materials.

[0056] Since the friction coefficient between the anti-slip layer 114 in the groove and the material strip is relatively high, the resulting anti-slip effect can improve the flattening effect of the material strip.

[0057] In some embodiments, the outer surface of the anti-slip layer 114 is flush with the portion of the circumferential surface of the flattening roller 110 where the first group of spiral grooves 111 and the second group of spiral grooves 112 are not provided.

[0058] FIG3 shows a schematic cross-sectional view of a flattening roller 110 in a battery strip laminating device 100, illustrating a cross-section of the flattening roller 110 and the grooves thereon. As shown in FIG3 , an anti-slip layer 114 fills the grooves (the grooves shown here may be grooves in the first set of spiral grooves 111 or the second set of spiral grooves 112 ). The outer surface of the anti-slip layer 114 is flush with a portion 113 of the circumferential surface of the flattening roller that is not provided with the first and second sets of spiral grooves.

[0059] Thus, when the first material strip 901 contacts the flattening roller 110, it not only contacts the anti-slip layer 114 but also contacts the portion 113 of the circumferential surface of the flattening roller that is not provided with the first and second sets of spiral grooves. In other words, the first material strip 901 contacts as much of the entire surface of the flattening roller 110 as possible, thereby reducing or avoiding the problem of the material strip not being properly flattened due to the uneven surface of the flattening roller 110.

[0060] In some embodiments, the cross-sectional shape of the first group of spiral grooves 111 and the second group of spiral grooves 112 is conical.

[0061] Continuing to refer to FIG3 , it can be seen from the cross-sectional schematic diagram of the flattening roller 110 in the battery strip composite device 100 shown in FIG3 that the cross-sectional shape of the groove is conical.

[0062] The groove with a tapered cross section facilitates filling the groove with the anti-slip layer material more easily and can save the amount of anti-slip layer material because the tapered tip at the bottom of the groove requires less anti-slip layer material.

[0063] In some embodiments, the spacing between two adjacent grooves in the first set of spiral grooves is in the range of 3-5 mm, and the spacing between two adjacent grooves in the second set of spiral grooves is in the range of 3-5 mm. For example, the spacing between two adjacent grooves in the first set of spiral grooves can be 3 mm, 4 mm, or 5 mm; the spacing between two adjacent grooves in the second set of spiral grooves can be 3 mm, 4 mm, or 5 mm.

[0064] Furthermore, each groove in the first or second group of spiral grooves may have a groove width a of 3-10 mm. Furthermore, each groove in the first or second group of spiral grooves may have a groove depth b of 4-10 mm. For example, the groove width a of each groove in the first or second group of spiral grooves may be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm. The groove depth b of each groove in the first or second group of spiral grooves may be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm.

[0065] In some embodiments, the composite roller group may include a first roller and a second roller arranged parallel to the first roller, the circumferential side surfaces of the first roller and the second roller are opposite to each other, so as to roll-combine the second material strip and the flattened first material strip, and wherein at least one of the first roller and the second roller is a heated roller.

[0066] 1 , the composite roller set 120 may include a first roller 121 and a second roller 122 disposed parallel to the first roller 121. The circumferential sides of the first roller 121 and the second roller 122 face each other to perform roll-combination on the second material strip 902 and the flattened first material strip 901.

[0067] A certain gap may be provided between the first roller 121 and the second roller 122, which are arranged in parallel, to allow the flattened first material strip 901 to pass through the gap. In addition, the gap between the first roller 121 and the second roller 122 may be adjusted (e.g., narrowed) to roll the traveling first material strip 901.

[0068] Furthermore, at least one of the first roller 121 and the second roller 122 is a heated roller, which can dissipate heat to heat and laminate the first material strip 901. For example, the first roller 121 can be a heated roller, or both the first roller 121 and the second roller 122 can be heated rollers. In an example, the heated rollers can be configured by providing a cavity within the rollers that can accommodate a heat transfer fluid.

[0069] This can further improve the efficiency of the heated roll pressing.

[0070] In some embodiments, the first roller 121 may be a heating roller, and the flattening roller 110 is disposed on one side of the heating roller to flatten the first material strip 901 heated by the heating roller.

[0071] In the example, the first roller 121 , the second roller 122 and the flattening roller 110 may be arranged as shown in FIG1 , that is, the flattening roller 110 may be arranged as close as possible to the position where the first roller 121 and the second roller 122 perform roll-combining on the material strip.

[0072] Thus, the first material strip 901 can be first heated by the first roller 121, then flattened by the flattening roller 110. After being flattened, it is then hot-pressed and laminated with the second material strip 902 through the gap between the first roller 121 and the second roller 122. This achieves a compact layout while also allowing for the reuse of the heating roller (i.e., the first roller 121).

[0073] It will be understood that the battery material strip composite device 100 according to the present application may also include more rollers, such as multiple rollers not marked in FIG. 1 , which can guide the material strip before and after composite.

[0074] An embodiment of the second aspect of the present application provides a battery manufacturing system, including a battery material strip composite device 100 according to the above embodiment of the present application.

[0075] Because the first material strip is flattened before being combined with the second material strip, wrinkles and diagonal stripes on the first material strip are reduced. Accordingly, the battery manufacturing system with the battery material strip combining device 100 can further improve the yield of the produced batteries.

[0076] The technical solution of this application is further illustrated below through a specific embodiment.

[0077] 1 to 3 , the battery strip composite device 100 includes a frame (not shown in the figures), a flattening roller 110 and a composite roller group 120 .

[0078] The flattening roller 110 is rotatably mounted on a frame and is used to flatten the first material strip 901. The circumferential surface of the flattening roller 110 is formed with a first set of spiral grooves 111 and a second set of spiral grooves 112. The first and second sets of spiral grooves 111, 112 extend from the center of the flattening roller 110 toward its ends in opposite spiral directions. The first and second sets of spiral grooves 111, 112 are provided with an anti-slip layer. The first and second sets of spiral grooves 111, 112 intersect at an angle of 20 to 60 degrees at the center of the flattening roller 110. The flattening roller's rotational direction can be set so that the intersection of the first and second sets of spiral grooves 111, 112 on the flattening roller 110 contacts the first material strip before any other portion of the first or second sets of spiral grooves 111, 112. Furthermore, the outer surface of the anti-slip layer 114 is flush with the portion 113 of the circumferential surface of the flattening roller where the first and second groups of spiral grooves are not provided. Furthermore, the cross-sectional shape of the first and second groups of spiral grooves 111 and 112 is conical. Furthermore, the spacing between adjacent grooves in the first group of spiral grooves is within a range of 3-5 mm, and the spacing between adjacent grooves in the second group of spiral grooves is within a range of 3-5 mm. Each groove in the first or second group of spiral grooves can have a groove width a of 3-10 mm. Furthermore, each groove in the first or second group of spiral grooves can have a groove depth b of 4-10 mm.

[0079] Laminating roller set 120 includes a first roller 121 and a second roller 122 arranged parallel to first roller 121. The circumferential surfaces of first roller 121 and second roller 122 face each other to perform roll-compression lamination on second material strip 902 and flattened first material strip 901. First roller 121 is a heated roller, and flattening roller 110 is positioned to one side of the heated roller to flatten first material strip 901, which has been heated by the heated roller.

[0080] 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 battery strip composite device (100), comprising: frame; a flattening roller (110), the flattening roller being rotatably disposed on the frame and being used to flatten the first material strip (901), wherein a circumferential surface of the flattening roller has a first group of spiral grooves (111) and a second group of spiral grooves (112), the first group of spiral grooves and the second group of spiral grooves extending in opposite spiral directions from the middle of the flattening roller to both ends of the flattening roller; and A composite roller group (120) is rotatably arranged on the frame and is configured to perform roll-combination on the second material strip (902) and the flattened first material strip (901).

2. The battery strip composite device according to claim 1, wherein: The first group of spiral grooves (111) and the second group of spiral grooves (112) of the flattening roller (110) intersect at a preset angle at the middle of the flattening roller.

3. The battery strip composite device according to claim 2, wherein: The preset angle is in the range of 20 to 60 degrees.

4. The battery strip composite device according to claim 2 or 3, wherein: The rotation direction of the flattening roller (110) is set so that the intersection position of the first group of spiral grooves (111) and the second group of spiral grooves (112) of the flattening roller contacts the first material strip (901) before other parts of the first group of spiral grooves or the second group of spiral grooves.

5. The battery strip composite device according to any one of claims 1 to 4, wherein: An anti-slip layer (114) is provided in the first group of spiral grooves and the second group of spiral grooves.

6. The battery strip composite device according to claim 5, wherein: The outer surface of the anti-slip layer (114) is flush with a portion (113) of the circumferential surface of the flattening roller (110) where the first group of spiral grooves and the second group of spiral grooves are not provided.

7. The battery strip composite device according to any one of claims 1 to 6, wherein: The groove cross-sections of the first group of spiral grooves (111) and the second group of spiral grooves (112) are conical.

8. The battery strip composite device according to any one of claims 1 to 7, wherein: The spacing between two adjacent grooves in the first group of spiral grooves (111) is within the range of 3-5 mm, and the spacing between two adjacent grooves in the second group of spiral grooves (112) is within the range of 3-5 mm.

9. The battery material strip composite device according to any one of claims 1 to 8, wherein: The composite roller group (120) includes a first roller (121) and a second roller (122) arranged parallel to the first roller, the peripheral side surfaces of the first roller and the second roller are opposite to each other so as to roll-combine the second material strip and the flattened first material strip, and at least one of the first roller and the second roller is a heating roller.

10. The battery strip composite device according to claim 9, wherein: The first roller (121) is a heating roller, and the flattening roller (110) is arranged on one side of the heating roller to flatten the first material strip heated by the heating roller.

11. A battery manufacturing system comprising the battery material strip composite device (100) according to any one of claims 1 to 10.

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