Flattening mechanism and flattening system for battery foil

Abstract

The utility model discloses a flattening mechanism and a flattening system for a battery foil, the flattening mechanism is a polygonal prism, and each ridge line of the polygonal prism is a smooth ridge line; the flattening mechanism is connected with a rotating mechanism, and the rotating mechanism is used for controlling the polygon prism to rotate, so that the polygon prism can rotate in the forward direction and the reverse direction. When the flattening mechanism disclosed by the utility model is used, stress is released by utilizing a larger space formed between the edges of the polygonal prismoid and the tape conveying film, so that the stress can be better released, creases or traces are avoided, and a better flattening effect can be achieved on curled wrinkles with larger wrap angles in a battery foil.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, concretely relates to a kind of flattening mechanism and flattening system for battery foil. BACKGROUND

[0002] At present, the flattening mechanism generally used in existing battery technology field is spiral flattening mechanism, the structure of spiral flattening mechanism is rotated from middle to both ends at a certain angle, thread is denser, slight wrinkle can be flattened, but foil surface treatment cannot be made flat when encountering relatively large fluctuation.

[0003] The flattening roller of the flattening mechanism generally used at present is provided with transverse or vertical groove, the purpose of the flattening roller provided with groove is to release stress when product is carried, but the setting of groove brings other problems: when rotating forward or reversely, the unevenness of roller will lead to large roller surface friction coefficient, and then product is damaged, in addition, the design of groove has certain radian, and when reversely rotating, product is wrinkled, so generally it cannot be reversely used;The design and manufacture of existing flattening mechanism are difficult, the manufacturing cost is large, and it is not convenient to maintain;Impurities are easily left in groove, which affects product quality;When product version is different, such as width, the size of groove should also be adjusted.

[0004] In battery foil production, if product version and roller have certain deviation in the process of light foil carrying and active substance coating, battery foil is easily wrinkled, scratched and abnormally, so as to cause the loss of scrap battery foil. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above problems, and provides a kind of flattening mechanism and flattening system for battery foil, change the way of setting groove in flattening roller to release stress, adopt the three-dimensional flattening structure of polygonal prism, release stress by the space formed between prism edge and carrying film.

[0006] The technical scheme provided by the utility model is:

[0007] A kind of flattening mechanism for battery foil, the flattening mechanism is polygonal prism, each edge line of the polygonal prism is smooth edge line;

[0008] The flattening mechanism is connected with rotating mechanism, and the rotating mechanism is used to control the rotation of polygonal prism, so that polygonal prism can rotate in two directions of positive direction and reverse direction.

[0009] To optimize the above technical scheme, the specific measures also include:

[0010] The polygonal prism includes central flattening roller and surface cladding layer.

[0011] Further, the radial section of the center flattening roller is a polygon, and each edge line of the center flattening roller is polished smooth.

[0012] Further, the surface coating layer is tightly coated on the outer surface of the center flattening roller, and the surface coating layer is uniformly coated with a uniform thickness on each surface of the center flattening roller.

[0013] As a preferred scheme, the flattening mechanism is a pentagonal prism, a hexagonal prism, a heptagonal prism or an octagonal prism.

[0014] As a preferred scheme, the surface coating layer is a ceramic layer.

[0015] Further, the thickness of the surface coating layer is greater than or equal to 2um.

[0016] The utility model also provides a kind of for battery foil flattening system, including unwinding mechanism, over roller, flattening mechanism and winding mechanism, the flattening mechanism uses above-mentioned for battery foil flattening mechanism and flattening system.

[0017] Further, the over roller includes a first over roller and a second over roller, the first over roller is arranged between the unwinding mechanism and the flattening mechanism, and the second over roller is arranged between the flattening mechanism and the winding mechanism.

[0018] As a preferred scheme, the unwinding mechanism, the first over roller and the flattening mechanism are arranged in a first height range, the second over roller and the winding mechanism are arranged in a second height range, and there is a height difference between the first height range and the second height range; the battery foil belt between the flattening mechanism and the second over roller is Z-shaped.

[0019] Compared with the prior art, the utility model has the beneficial effects that:

[0020] The flattening mechanism of the utility model adopts a polygonal prism structure, and each edge line of the polygonal prism is a smooth edge line. When the battery foil passes through the flattening mechanism, a stress release area is formed between the curved surface of the battery foil and the prism side surface of the polygonal prism, which can achieve good flattening effect, especially for the large-angle curling wrinkles.

[0021] When the over roller is used, the large space between the polygonal prism edge and the belt film can release stress, which can better release stress and avoid producing creases or marks.

[0022] The utility model discloses adopt the stereoscopic flat structure of polygonal prism, release stress through the space formed between prism side line and tape film, be applicable to the flattening of larger battery foil fold, and because the space of stress release is enough, thus need not adjust the roller size parameter according to product version.

[0023] The flattening mechanism of the utility model is preferably a pentagonal prism, a hexagonal prism, a heptagonal prism or an octagonal prism, and too few or too many sides of the polygonal prism cannot satisfy the stress release area with a proper space size.

[0024] The flattening mechanism can rotate in both forward and reverse directions, and is generally rotated in the forward direction during normal production.

[0025] However, when the production is abnormal and needs to be rewound, the flattening mechanism will not cause product folding and other problems.

[0026] The flattening mechanism is provided with a cladding layer on the surface, which is preferably a ceramic cladding layer, and the ceramic cladding layer can remove static electricity, reduce metal impurities and reduce friction through smooth ceramic. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The utility model discloses a flattening mechanism for battery foil.

[0028] Figure 2 The utility model discloses a flattening mechanism for battery foil.

[0029] Figure 3 The utility model discloses a flattening mechanism for battery foil.

[0030] In the drawing: 1-flattening mechanism, 2-center flattening roller, 3-surface cladding layer, 4-unwinding mechanism, 5-first passing roller, 6-second passing roller, 7-winding mechanism, 8-stress release area, 9-battery foil. DETAILED DESCRIPTION

[0031] The above content of the utility model will be further explained in the form of examples, but this should not be understood as the scope of the above subject matter of the utility model being limited to the following examples, and any technology realized based on the above content of the utility model belongs to the scope of the utility model.

[0032] In the description of the utility model, it also needs to be explained that:

[0033] The orientation or position relationship is based on the relationship shown in the drawings and is only for the convenience of describing the present invention and simplifying the description. It does not indicate or imply that the device referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0034] In this application, the description is required to Figure 3 The middle right direction is the positive direction, Figure 3 The center left position is the reverse direction.

[0035] In addition, terms such as "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0036] The utility model provides a flattening mechanism 1 and a flattening system for battery foil 9, such as Figure 1 、 Figure 2 As shown, the flattening mechanism 1 is a polygonal prism, and each edge line of the polygonal prism is a smooth edge line;

[0037] The flattening mechanism 1 is connected to a rotating mechanism, which is used to control the rotation of the polygonal prism so that the polygonal prism can rotate in both forward and reverse directions.

[0038] In some embodiments, the polygonal prism includes a central flattening roller 2 and a surface covering layer 3 .

[0039] The radial cross section of the central flattening roller 2 is polygonal, and each edge line of the central flattening roller 2 is polished and smooth.

[0040] The surface covering layer 3 is tightly covered on the outer surface of the central flattening roller 2 , and the surface covering layer 3 is evenly covered on all surfaces of the central flattening roller 2 with a consistent thickness.

[0041] A certain tension is applied to the battery foil 9 so that the foil 9 passes through the flattening mechanism 1 to be flattened. When the battery foil 9 passes through the flattening mechanism 1, a certain space is created between the curved surface of the foil 9 and the prism side surfaces of the polygonal prism, forming a stress relief area 8. This provides a good flattening effect, especially for wrinkles with large wrap angles.

[0042] As a preferred solution, the flattening mechanism 1 is a hexagonal prism. In some embodiments, the flattening mechanism 1 can also be a pentagonal prism, a heptagonal prism, an octagonal prism, etc., but considering the flattening effect brought by the size of the stress release area and cost considerations, the hexagonal prism is the better choice.

[0043] As a preferred solution, the surface coating layer 3 is a ceramic layer.

[0044] In some embodiments, the thickness of the surface coating layer 3 is ≥ 2 μm.

[0045] The present invention also provides a flattening system for battery foil 9, such as Figure 3 As shown, it includes an unwinding mechanism 4, a roller, a flattening mechanism 1 and a winding mechanism 7. The flattening mechanism 1 adopts the above-mentioned flattening mechanism 1 and flattening system for battery foil 9.

[0046] In some embodiments, the rollers include a first roller 5 and a second roller 6 , the first roller 5 is disposed between the unwinding mechanism 4 and the flattening mechanism 1 , and the second roller 6 is disposed between the flattening mechanism 1 and the winding mechanism 7 .

[0047] As a preferred solution, the unwinding mechanism 4, the first roller 5, and the flattening mechanism 1 are arranged within a first height range, the second roller 6 and the winding mechanism 7 are arranged within a second height range, and there is a height difference between the first height range and the second height range; the battery foil 9 from the flattening mechanism 1 to the second roller 6 runs in a Z shape.

[0048] The types of battery foils 9 that can use the flattening mechanism 1 of the present application include, but are not limited to: copper foil, aluminum foil, nickel foil, copper alloy foil, aluminum alloy foil, and composite current collector.

[0049] The following is a further detailed explanation with reference to specific examples.

[0050] In some embodiments, a stainless steel hollow tube may be used and its shape may be designed into a hexagonal prism. The specific steps are as follows:

[0051] Polish the six prisms of the stainless steel hollow tube until smooth, and measure whether the smooth plating is qualified;

[0052] A ceramic layer with a thickness of ≥2 μm is plated on the hexagonal prism, and the ceramic layer is firmly adhered to the surface of the hexagonal prism through high-temperature baking to obtain a flattening mechanism;

[0053] Install the flattening mechanism that has passed the inspection to a location with a larger belt wrap angle (such as the lithium battery coating process location);

[0054] When passing the roller, the lithium-ion battery foil 9 passes through the surface of the flattening mechanism. When the battery foil 9 is given a certain tension, the flattening effect can be clearly seen.

[0055] The flattening mechanism of the utility model has a simple structure and adopts a polygonal prism to better solve the problem of battery foil wrinkles. The flattening mechanism of the utility model is suitable for flattening larger battery foil wrinkles and can greatly improve the flattening effect of the battery foil.

[0056] The flattening mechanism is low in design and preparation threshold, and is convenient for design and mass production; the flattening mechanism is low in process cost, and is convenient for rapid production and use.

[0057] The above is only the preferred embodiment of the utility model, and does not limit the utility model in any form, and any skilled person in the art, without departing from the technical scheme range of the utility model, according to the technical essence of the utility model, any simple modification, equivalent replacement and improvement of the above embodiment, etc. still belong to the protection range of the technical scheme of the utility model.

Claims

1. A flattening mechanism for battery foil, characterized in that: The flattening mechanism is a polygonal prism, and each edge line of the polygonal prism is a smooth edge line; The flattening mechanism is connected to a rotating mechanism, and the rotating mechanism is used to control the rotation of the polygonal prism so that the polygonal prism can rotate in both forward and reverse directions.

2. The flattening mechanism for battery foil according to claim 1, characterized in that: The polygonal prism comprises a central flattening roller and a surface covering layer.

3. The flattening mechanism for battery foil according to claim 2, characterized in that: The radial cross section of the central flattening roller is polygonal, and each edge line of the central flattening roller is polished and smooth.

4. The flattening mechanism for battery foil according to claim 2, characterized in that: The surface covering layer is tightly covered on the outer surface of the central flattening roller, and the surface covering layer is uniformly covered on each surface of the central flattening roller with a consistent thickness.

5. The flattening mechanism for battery foil according to claim 1, characterized in that: The flattening mechanism is a pentagonal prism, a hexagonal prism, a heptagonal prism or an octagonal prism.

6. The flattening mechanism for battery foil according to claim 2, characterized in that: The surface coating layer is a ceramic layer.

7. The flattening mechanism for battery foil according to claim 2, characterized in that: The thickness of the surface coating layer is ≥2um.

8. A flattening system for battery foil, characterized in that: The invention comprises an unwinding mechanism, a roller, a flattening mechanism and a winding mechanism. The flattening mechanism adopts the flattening mechanism for battery foil according to any one of claims 1 to 7.

9. The battery foil flattening system according to claim 8, characterized in that: The passing rollers include a first passing roller and a second passing roller. The first passing roller is arranged between the unwinding mechanism and the flattening mechanism, and the second passing roller is arranged between the flattening mechanism and the winding mechanism.

10. The battery foil flattening system according to claim 9, characterized in that: The unwinding mechanism, the first roller, and the flattening mechanism are arranged within a first height range, and the second roller and the winding mechanism are arranged within a second height range. There is a height difference between the first height range and the second height range; the battery foil tape from the flattening mechanism to the second roller is Z-shaped.

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