Structure for improving wrinkling of lithium battery coating foil

Abstract

The utility model discloses a structure for improving wrinkling of a lithium battery coating foil, and relates to the technical field of batteries. According to the specific implementation scheme, the structure comprises a tension partition roller, a tab, a material area and a middle blank area, tabs, material areas and middle blank areas are arranged on the surface of the tension partition roller, the tabs are arranged in grooves in the two ends of the tension partition roller, the multiple material areas are arranged, the multiple middle blank areas are arranged, and the middle blank areas are arranged between the material areas. According to the utility model, the tension partition roller is subjected to annular slotting processing treatment, so that the tab area and the middle blank area are prevented from being in direct contact with the tension partition roller, the problem that a large number of imprint wrinkles are caused by non-uniform distribution of extrusion force received between each part when a coated pole piece passes through the tension partition roller is effectively solved, the production cost is saved, and the production efficiency is improved. The product quality and the battery safety performance are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a structure for improving the wrinkling of lithium battery coating foils. Background Art

[0002] The existing tension isolation roller structure of lithium battery coating equipment is a flat roller. During the coating process, it is necessary to manually identify and adjust the tightness (clamping degree) of the tension isolation roller. Since the coating thicknesses in the tab area, the middle blank area, and the material area are inconsistent after the copper foil and aluminum foil are coated, the pressure and friction force received between each part of the coated electrode sheet are uneven when passing through the tension isolation roller of the traction mechanism, resulting in uneven extrusion and stretching of the entire coated electrode sheet. In particular, a large number of imprint wrinkles will occur at the tab position, causing a large number of quality problems of the electrode sheet, increasing the production cost, and even flowing to the subsequent processes, seriously affecting the performance and even safety of the lithium battery. Summary of the Invention

[0003] Based on this, in order to solve the problem of imprint wrinkles on the electrode sheet during the coating process of lithium batteries, the utility model provides a structure for improving the wrinkling of lithium battery coating foils.

[0004] The utility model provides a structure for improving the wrinkling of lithium battery coating foils, including: a tension isolation roller, tabs, a material area, and a middle blank area;

[0005] The surface of the tension isolation roller is provided with tabs, a material area, and a middle blank area. The tabs are arranged in the grooves at both ends of the tension isolation roller. There are multiple material areas and multiple middle blank areas. The middle blank areas are arranged between the material areas.

[0006] The middle blank area is an annular groove opened on the surface of the tension isolation roller.

[0007] The tension isolation roller is composed of a rubber layer and a roller core. The rubber layer wraps the surface of the roller core.

[0008] The rubber layer is made of one or more of nitrile, ethylene propylene diene monomer (EPDM), hypalon, solid silicone rubber, and polyurethane.

[0009] Both ends of the roller core are connected to bearing seats.

[0010] One end of the bearing seat is connected to one end of a slide rail. The tension isolation roller is connected to the slide rail through the bearing seat.

[0011] A cylinder is arranged at the other end of the slide rail.

[0012] A cooling roller is also arranged on one side of the tension isolation roller. The coated electrode sheet is located between the tension isolation roller and the cooling roller.

[0013] It further includes a bracket which is arranged at both ends of the tension isolation roller and the cooling roller.

[0014] Beneficial effects: The tension isolation roller is processed by annular grooving to avoid the direct contact between the tab area and the middle blank area and the tension isolation roller, effectively solving the problem of a large number of imprint wrinkles caused by uneven extrusion pressure distribution between each part when the coated pole piece passes through the tension isolation roller, saving production costs, and improving product quality and battery safety performance.

[0015] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to better understand the solution and do not constitute a limitation to the present invention. Among them:

[0017] Figure 1 is a schematic structural diagram of the tension isolation roller provided by the present invention;

[0018] Figure 2 is a schematic structural diagram of the existing tension isolation roller technology;

[0019] Figure 3 is a schematic assembly structural diagram of the tension isolation roller and the cooling roller provided by the present invention;

[0020] Figure 4 is a schematic cross-sectional structural diagram of the tension isolation roller provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following describes exemplary embodiments of the present invention with reference to the accompanying drawings. Various details of the embodiments of the present invention are included to assist in understanding, and they should be considered merely exemplary. Therefore, those of ordinary skill in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for the sake of clarity and conciseness, the description below omits the description of well-known functions and structures.

[0022] As Figure 1 shown, the present invention provides a structure for improving the wrinkling of lithium battery coating foils, including: a tension isolation roller 4, a tab area 11, a material area 12, and a middle blank area 13;

[0023] The surface of the tension separation roller 4 is provided with tab areas 11, material areas 12 and intermediate blank areas 13. The tab areas 11 are arranged in the grooves at both ends of the tension separation roller 4. There are multiple material areas 12 and multiple intermediate blank areas 13. The intermediate blank areas 13 are arranged between the material areas 12.

[0024] The intermediate blank area 13 is an annular groove formed on the surface of the tension separation roller 4.

[0025] As Figure 4 shown, the tension separation roller 4 is composed of a rubber layer 9 and a roller core 10, and the rubber layer 9 wraps the surface of the roller core 10.

[0026] The rubber layer 9 is made of one or more of nitrile (NBR), ethylene propylene diene monomer (EPDM), chlorosulfonated polyethylene (CSM), high temperature vulcanized silicone rubber (HTV) and polyurethane (PU).

[0027] Furthermore, the rubber layer 9 can effectively increase the friction force and has the functions of aging resistance, ozone resistance, acid and alkali resistance, high temperature resistance (130 - 150 °C), and alcohol and ketone resistance, and can be in direct contact with the coated electrode sheet 3.

[0028] Furthermore, the roller core 10 is made of steel, aluminum, stainless steel or glass fiber.

[0029] As Figure 3 shown, both ends of the roller core 10 are connected to the bearing seats 5.

[0030] One end of the bearing seat 5 is connected to one end of the slide rail 6, and the tension separation roller 4 is connected to the slide rail 6 through the bearing seat 5.

[0031] The other end of the slide rail 6 is provided with a cylinder 7.

[0032] One side of the tension separation roller 4 is also provided with a cooling roller 2, and the coated electrode sheet 3 is located between the tension separation roller 4 and the cooling roller 2.

[0033] It further includes a bracket 8, and the bracket 8 is arranged at both ends of the tension separation roller 4 and the cooling roller 2.

[0034] The bracket 8 plays a supporting role for the tension separation roller 4 and the cooling roller 2.

[0035] Furthermore, the cooling roller 2 is of a hollow structure. One end of the cooling roller 2 is provided with an external circulating cooling water reserved joint 1. The cooling roller 2 is made of high-quality 45# steel pipe or alloy steel, and is formed by heat treatment quenching and tempering, machining, precision grinding and hard chromium plating, then super-precision grinding and high-precision lapping, or polished into a mirror surface, with hard chromium plating on the surface, hardness above HRC65, roughness Ra0.05, durable, and with good corrosion resistance and high temperature resistance.

[0036] Before production, the two cylinders 7 are in a contracted state, and the tension isolation roller 4 bounces off to keep a gap with the cooling roller 2 for pre-production preparations such as threading and cleaning. During production, the two cylinders 7 extend, and drive the tension isolation roller 4 to push out along the slide rail 6 through the bearing seat 5 to contact the cooling roller 2 and clamp the coated electrode sheet 3, playing the role of tension isolation and conveying the coated electrode sheet 3.

[0037] Such as Figure 1 , for a certain lithium battery product A, the coating is multi-column (one out of three) coating. The sizes from left to right are: the tab 11 size is 19mm, the material area 12 size is 509mm, the middle blank area 13 size is 32mm, the material area 12 size is 509mm, the middle blank area 13 size is 32mm, the material area 12 size is 509mm, and the tab 11 size is 19mm; Coating process: size tolerance ±0.5mm, during the coating process, the surface of the coated electrode sheet 3 is smooth and flat, without obvious scratches, bulges, foil leakage, tab 11 wrinkles and other abnormal phenomena;

[0038] Comparing Figure 1 、 2 , the structure provided by the present invention can avoid the direct contact between the tab 11 area and the middle blank area 13 and the tension isolation roller 4 when the coated electrode sheet 3 passes through the tension isolation roller 4, effectively solving a large number of imprint wrinkles caused by uneven extrusion pressure distribution between each part of the coated electrode sheet 3 when passing through the tension isolation roller 4.

[0039] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any change or replacement within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A structure for improving the wrinkling of lithium battery coated foil, characterized in that: include: Tension separator roller, pole ear, material area and blank area in the middle; The surface of the tension-breaking roller is provided with pole ears, material areas and a middle blank area. The pole ears are arranged in grooves at both ends of the tension-breaking roller, a plurality of material areas are provided, a plurality of middle blank areas are provided, and the middle blank area is provided between the material areas.

2. The structure for improving wrinkling of lithium battery coated foil according to claim 1, characterized in that: The middle blank area is an annular groove opened on the surface of the tension isolation roller.

3. A structure for improving wrinkling of lithium battery coated foil according to claim 1 or 2, characterized in that: The tension isolation roller is composed of a rubber layer and a roller core, and the rubber layer is wrapped around the surface of the roller core.

4. The structure for improving wrinkling of lithium battery coated foil according to claim 3, characterized in that: Both ends of the roller core are connected to the bearing seats.

5. The structure for improving wrinkling of lithium battery coated foil according to claim 4, characterized in that: One end of the bearing seat is connected to one end of the slide rail, and the tension isolation roller is connected to the slide rail through the bearing seat.

6. The structure for improving wrinkling of lithium battery coated foil according to claim 5, characterized in that: The other end of the slide rail is provided with a cylinder.

7. The structure for improving wrinkling of lithium battery coated foil according to claim 6, characterized in that: A cooling roller is also provided on one side of the tension-breaking roller, and the coating electrode is located between the tension-breaking roller and the cooling roller.

8. The structure for improving wrinkling of lithium battery coated foil according to claim 7, characterized in that: It also includes a bracket, which is arranged at both ends of the tension isolation roller and the cooling roller.

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