Battery material strip compounding device and battery manufacturing system

Abstract

The utility model provides a battery material strip compounding device and a battery manufacturing system, and relates to the technical field of battery manufacturing. The battery material belt compounding device comprises a rack; the flattening roller can be rotatably arranged on the rack and is used for flattening the first material belt, a first group of spiral grooves and a second group of spiral grooves are formed in the peripheral side surface of the flattening roller, and the first group of spiral grooves and the second group of spiral grooves rotationally extend from the middle of the flattening roller to the two ends of the flattening roller in opposite spiral directions; and the composite roller group can be rotatably arranged on the rack and is configured to perform rolling compounding on the second material belt and the flattened first material belt.

Description

Technical Field

[0001] 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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the battery manufacturing process, a composite current collector can be manufactured by heating and compounding. The multiple layers of the composite current collector include a diaphragm layer. The thickness of the diaphragm layer is usually thin and made of a soft material. 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 whole. The main reasons include that the diaphragm layer shrinks during the heating process, and air may enter the diaphragm layer during the roller bonding process to generate bubbles. Such abnormalities will affect the adhesion of the product and lead to low product yield. Utility Model Content

[0004] 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.

[0005] 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 extend in opposite spiral directions from the middle of the flattening roller to both ends of the flattening roller, respectively; 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.

[0006] In the technical solution of the embodiment of the present application, when the first material strip contacts the flattening roller, the two groups of spiral grooves extending in opposite spiral directions on the flattening roller can provide forces in different directions to the first material strip, thereby flattening the first material strip. After being flattened by the flattening roller, the first material strip and the second material strip can be compounded by rolling on the composite roller group. Since the first material strip has been flattened, the wrinkles and oblique stripes on it are reduced, making the first material strip as flat as possible. Accordingly, the product yield of the composite material strip is improved.

[0007] In some embodiments, the first group of spiral grooves and the second group of spiral grooves of the flattening roller intersect at a preset angle at the middle of the flattening roller. Since the first group of spiral grooves and the second group of spiral grooves intersect at a preset angle at the middle of the flattening roller, when the first material strip contacts the flattening roller, the first material strip can be simultaneously unfolded from a position corresponding to the intersection position in the middle to both sides, thereby reducing the situation where the flattening degree of both sides of the material strip is inconsistent, thereby further improving the flattening effect of the flattening roller.

[0008] 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.

[0009] In some embodiments, the rotation direction of the flattening roller is set so that the intersection position of the first set of spiral grooves and the second set of spiral grooves of the flattening roller contacts the first material strip before other parts of the first set of spiral grooves or the second set of spiral grooves, thereby further improving the flattening effect of the flattening roller on the material strip.

[0010] In some embodiments, an anti-skid layer may be provided in the first group of spiral grooves and the second group of spiral grooves. Since the friction coefficient between the anti-skid layer in the grooves and the material strip is relatively high, the anti-skid effect thus produced can improve the flattening effect of the material strip.

[0011] In some embodiments, the outer surface of the anti-skid layer is flush with the portion of the circumferential surface of the flattening roller where the first and second groups of spiral grooves are not provided. Thus, when the first material strip contacts the flattening roller, it can contact not only the anti-skid layer but also the portion of the circumferential surface of the flattening roller where the first and second groups of spiral grooves are not provided. In other words, the first material strip can contact the entire surface of the flattening roller as much as possible, thereby reducing or avoiding the problem that the material strip cannot be flattened well due to the uneven surface of the flattening roller.

[0012] In some embodiments, the groove cross-section of the first group of spiral grooves and the second group of spiral grooves is conical. The grooves with conical cross-sections are convenient for filling the anti-skid layer material into the grooves, and can save the amount of anti-skid layer material because the conical tip at the bottom of the groove requires less anti-skid layer material.

[0013] In some embodiments, a spacing between two adjacent grooves in the first set of spiral grooves is in a range of 3-5 mm, and a spacing between two adjacent grooves in the second set of spiral grooves is in a range of 3-5 mm.

[0014] In some embodiments, the composite roller set includes a first roller and a second roller arranged in parallel with the first roller, the peripheral side surfaces of the first roller and the second roller are opposite to each other, so as to perform roll-compression composite 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 heating roller. Thus, the efficiency of the heating roll-pressing can be further improved.

[0015] In some embodiments, the first roller is a heating roller, and the flattening roller is arranged on one side of the heating roller to flatten the first material strip heated by the heating roller. Thus, the first material strip can be first heated by the first roller, and then flattened by the flattening roller. After being flattened, it is hot-pressed and laminated with the second material strip through the gap between the first roller and the second roller. Thus, the heating roller (i.e., the first roller) can be reused while achieving a compact arrangement.

[0016] The embodiment of the second aspect of the present application provides a battery manufacturing system, including the battery material strip composite device according to the first aspect of the present application. Since the first material strip is flattened before being composited with the second material strip, wrinkles and diagonal stripes thereon are reduced. Accordingly, the battery manufacturing system having the above-mentioned battery material strip composite device can further improve the yield of the produced batteries.

[0017] 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

[0018] 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.

[0019] Figure 1 This is a schematic structural diagram of a battery strip composite device according to some embodiments of the present application;

[0020] Figure 2 A schematic diagram of the structure of a flattening roller in a battery strip composite device in some embodiments of the present application; and

[0021] Figure 3 It is a schematic cross-sectional view of a flattening roller in a battery strip composite device according to some embodiments of the present application.

[0022] Description of reference numerals:

[0023] 100. Battery material strip composite device; 110. Flattening roller; 111. First group of spiral grooves; 112. Second group of spiral grooves; 113. Portions 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-skid layer; 120. Composite roller group; 121. First roller; 122. Second roller; 901. First material strip; 902. Second material strip. DETAILED DESCRIPTION

[0024] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0026] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0027] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0029] 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).

[0030] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0031] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0032] 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 membrane surface. Such abnormalities will affect the adhesion of the product and result in low product yield.

[0033] In view of this, an embodiment of the present application provides a battery material strip composite device and a battery manufacturing system.

[0034] The battery material strip composite device disclosed in the embodiment of the present application can be applied to battery production and manufacturing, for example, to flatten the glue layer of the composite current collector and the polyethylene terephthalate (PET) separator layer. In addition, the battery material strip composite device disclosed in the embodiment of the present application can also be applied in other fields to flatten and composite film products.

[0035] An embodiment of the present application provides a battery strip composite device. Figure 1 Schematic diagram of the structure of a battery strip composite device 100 according to some embodiments of the present application. Figure 2is a schematic diagram of the structure of a flattening roller in a battery strip composite device in some embodiments of the present application, and Figure 3 It is a schematic cross-sectional view of a flattening roller in a battery strip composite device according to some embodiments of the present application.

[0036] refer to Figure 1 An embodiment of the present application provides a battery material strip composite device 100 , and the battery material strip composite device 100 includes a frame, a flattening roller 110 and a composite roller group 120 .

[0037] The rack may be a frame or base of the battery strip composite device, or a part of the frame or base, or may be other supporting structures. Figure 1 The frame is not shown. The flattening roller 110 is rotatably arranged on the frame for flattening the first material strip 901. 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 extend in opposite spiral directions from the middle of the flattening roller 110 to both ends of the flattening roller 110. The composite roller group 120 is rotatably arranged on the frame and is configured to roll-combine the second material strip 902 with the flattened first material strip 901.

[0038] In the example, the entirety of the flattening roller 110 may be a cylindrical structure. The flattening roller 110 may be a solid structure or may be hollow. The material of the flattening roller 110 may be stainless steel or a ceramic material. And the flattening roller 110 may be rotatably mounted on the frame via a rotating shaft. It will be understood that the rotation of the flattening roller 110 relative to the frame may be driven by a motor, and the motor may be disposed on the frame. When the flattening roller 110 is working, the first material strip 901 may be pressed against the flattening roller 110 under the action of a certain pulling force.

[0039] The first group of spiral grooves 111 and the second group of spiral grooves 112 may each have a plurality of spiral grooves, and the plurality of spiral grooves in each group of spiral grooves may be spaced a certain distance apart. Figure 2 As can be seen in the figure, the first group of spiral grooves 111 and the second group of spiral grooves 112 extend in opposite spiral directions from the middle of the flattening roller 110 to both ends of the flattening roller 110. In the example, the middle of the flattening roller 110 can be the middle position of the flattening roller 110 along its longitudinal axis, or near the middle position.

[0040] In the example, Figure 1As shown, the first material strip 901 can be a composite layer of a glue 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 metal layer 913-glue layer 911-PET diaphragm layer 912.

[0041] Thus, when the first material strip 901 contacts the flattening roller 110, the two groups of spiral grooves extending in opposite spiral directions on the flattening roller 110 can provide forces in different directions to the first material strip 901, thereby flattening the first material strip 901. After being flattened by the flattening roller 110, the first material strip 901 and the second material strip 902 can be compounded by rolling on the compounding roller group 120. Since the first material strip 901 has been flattened, the wrinkles and oblique stripes on it are reduced, making the first material strip 901 as flat as possible. Accordingly, the product yield of the compounded material strip is improved.

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

[0043] from Figure 2 As can be seen in the figure, the first group of spiral grooves 111 and the second group of spiral grooves 112 intersect in a "V" shape at the middle of the flattening roller 110. For example, a spiral groove in the first group of spiral grooves 111 and a corresponding spiral groove in the second group of spiral grooves 112 may intersect at a preset 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 a 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. Figure 2 As shown, the angle may be in the range of 20 to 60 degrees. That is, one of the first set of spiral grooves 111 may be 10 to 30 degrees away from the rotation direction of the flattening roller 110; one of the second set of spiral grooves 112 may be 10 to 30 degrees away from the rotation 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 group of spiral grooves 111 and the second group of spiral grooves 112 of the flattening roller 110 contacts the first material strip before other parts of the first group of spiral grooves 111 or the second group of spiral grooves 112 contact the first material strip.

[0052] In an example, the rotation direction of the flattening roller can be 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 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] Thus, the flattening effect of the flattening roller 110 on the material strip can be further improved.

[0054] In some embodiments, an anti-slip layer 114 may be disposed 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 a polyurethane material or other known plastic materials.

[0056] Since the friction coefficient between the anti-skid layer 114 in the groove and the material strip is relatively high, the anti-skid effect produced thereby 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 a 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] exist Figure 3The cross-sectional schematic diagram of the flattening roller 110 in the battery strip composite device 100 shown in FIG. 1 shows the cross-sectional view of the flattening roller 110 and the grooves thereon. Figure 3 As shown, the anti-slip layer 114 is filled in the grooves (the grooves shown here may be grooves in the first group of spiral grooves 111 or the second group of spiral grooves 112), and the outer surface of the anti-slip layer 114 is flush with the portion 113 of the circumferential side surface of the flattening roller 110 where the first group of spiral grooves and the second group of spiral grooves are not set.

[0059] Therefore, when the first material strip 901 contacts the flattening roller 110, it can contact not only the anti-slip layer 114, but also the 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. In other words, the first material strip 901 can contact the entire surface of the flattening roller 110 as much as possible, thereby reducing or avoiding the problem that the material strip cannot be flattened well due to the uneven surface of the flattening roller 110.

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

[0061] Continue to refer Figure 3 ,exist Figure 3 As can be seen from the cross-sectional schematic diagram of the flattening roller 110 in the battery material strip composite device 100, the groove cross-sectional shape is conical.

[0062] The groove with a conical cross section is conducive to easier filling of the anti-slip layer material into the groove, and can save the material of the anti-slip layer because the conical 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] In addition, each groove in the first group of spiral grooves or the second group of spiral grooves may have a groove width a of 3-10 mm. And each groove in the first group of spiral grooves or the 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 group of spiral grooves or the 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 group of spiral grooves or the 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 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 wherein at least one of the first roller and the second roller is a heated roller.

[0066] like Figure 1 As shown, 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 side surfaces of the first roller 121 and the second roller 122 are opposite to each other so as to perform roll-combination on the second material strip 902 and the flattened first material strip 901.

[0067] There may be a certain gap between the first roller 121 and the second roller 122 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., reduced) to roll the traveling first material strip 901.

[0068] In addition, at least one of the first roller 121 and the second roller 122 is a heating roller, and the heating roller can radiate heat to the outside, so as to heat and laminate the first material strip 901. For example, the first roller 121 can be a heating roller, or the first roller 121 and the second roller 122 are both heating rollers. In an example, the heating roller can be configured by providing a cavity capable of accommodating a heat-conducting fluid inside the roller.

[0069] This can further improve the efficiency of the heating 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 can be referred to as Figure 1 That is, the flattening roller 110 can be arranged as close as possible to the position where the first roller 121 and the second roller 122 perform roll-combination on the material strip.

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

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

[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-mentioned embodiment of the present application.

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

[0076] The technical solution of the present application is further described below through a specific embodiment.

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

[0078] The flattening roller 110 is rotatably arranged on the frame, and is used to flatten the first material strip 901. The circumferential surface of the flattening roller 110 has a first group of spiral grooves 111 and a second group of spiral grooves 112, which rotate and extend from the middle of the flattening roller 110 to both ends of the flattening roller 110 in opposite spiral directions, and an anti-slip layer is arranged in the first group of spiral grooves 111 and the second group of spiral grooves 112. The first group of spiral grooves 111 and the second group of spiral grooves 112 of the flattening roller 110 intersect at an angle of 20 to 60 degrees at the middle of the flattening roller 110. And the rotation direction of the flattening roller can be 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 110 contacts the first material strip before other parts of the first group of spiral grooves 111 or the second group of spiral grooves 112. In addition, the outer surface of the anti-slip layer 114 is flush with the portion 113 of the circumferential side surface of the flattening roller 110 where the first group of spiral grooves and the second group of spiral grooves are not provided. And the groove cross-sectional shape of the first group of spiral grooves 111 and the second group of spiral grooves 112 is conical. In addition, the spacing between two adjacent grooves in the first group of spiral grooves is in the range of 3-5 mm, and the spacing between two adjacent grooves in the second group of spiral grooves is in the range of 3-5 mm. Each groove in the first group of spiral grooves or the second group of spiral grooves may have a groove width a of 3-10 mm. And each groove in the first group of spiral grooves or the second group of spiral grooves may have a groove depth b of 4-10 mm.

[0079] The composite roller set 120 includes a first roller 121 and a second roller 122 arranged in parallel with the first roller 121. The peripheral side surfaces of the first roller 121 and the second roller 122 are opposite to each other so as to roll-combine the second material strip 902 and the flattened first material strip 901. 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 901 heated by the heating 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery strip composite device (100), characterized in that: include: frame; a flattening roller (110), the flattening roller being rotatably arranged on the frame and being used for flattening the first material strip (901), wherein the circumferential surface of the flattening roller comprises 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-compounding on the second material strip (902) and the flattened first material strip (901).

2. The battery strip composite device according to claim 1, characterized in that: 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, characterized in that: The preset angle is in the range of 20 to 60 degrees.

4. The battery strip composite device according to claim 2, characterized in that: 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 claim 1, characterized in that: 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, characterized in that: 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 claim 1, characterized in that: The groove cross-section shape of the first group of spiral grooves (111) and the second group of spiral grooves (112) is conical.

8. The battery strip composite device according to claim 1, characterized in that: 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 strip composite device according to any one of claims 1 to 8, characterized in that: 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 perform roll-compounding 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 heating roller.

10. The battery strip composite device according to claim 9, characterized in that: The first roller (121) is a heating roller, and wherein 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, characterized in that: It comprises a battery strip composite device (100) according to any one of claims 1 to 10.

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