Edge tearing prevention device for ultrathin lithium battery copper foil

Abstract

The invention provides an anti-tearing device for ultrathin lithium battery copper foil, which relates to the technical field of ultrathin electrolytic copper foil manufacturing and comprises a support, a support rod, a knife rest, a scraper and a laser. The support is used for being fixed to the crude foil engine, and one end of the supporting rod penetrates through the support and can move relatively. The knife rest is arranged at the other end of the supporting rod; the scraper is detachably fixed on the knife rest; the two lasers are arranged on the two sides of the scraper respectively. The elastic device is sleeved on the supporting rod, and two ends of the elastic device are respectively connected with the bracket and the knife rest, so that the scraper keeps applying force towards the cathode roller. The scraper is a flat-head type scraper, and the cutting edge surface of the scraper is parallel to the tangent plane of the contact point of the cathode roller and protrudes out of the edge of the cathode roller by 1-6 mm. And a plane formed by laser rays emitted by the two lasers coincides with a tangent plane of a stripping point of the cathode roller. The copper foil on the edge of the cathode roller is stripped through the scraper, the optimal stripping effect is ensured through laser positioning, and the edge tearing problem of the ultrathin electrolytic copper foil is effectively prevented.

Description

Technical Field

[0001] The invention relates to the technical field of ultra-thin electrolytic copper foil manufacturing, and in particular to an anti-tearing edge device for ultra-thin lithium battery copper foil. Background Art

[0002] Ultra-thin electrolytic copper foil is a key basic material in the fields of new energy vehicles, energy storage systems, and portable electronic devices. With the rapid development of these fields, the demand for high-performance, lightweight, ultra-thin electrolytic copper foil is growing. In the production and manufacturing process of electrolytic copper foil, the edge tearing problem is a technical problem that needs to be solved urgently. This problem not only affects the yield and product consistency of the copper foil, but also increases production costs and downtime, which seriously restricts the large-scale production of ultra-thin electrolytic copper foil.

[0003] At present, the factors that cause the edge tearing of electrolytic copper foil in the production process mainly include the following aspects: uneven distribution of electrolyte leads to inconsistent current density on the surface of the cathode roller; the surface state of the cathode roller is not ideal, such as uneven surface roughness or scratches; and improper tension control of the copper foil during the winding process. To solve the above problems, the existing technology mainly improves by optimizing the structure of the electrolytic cell to improve the uniformity of electrolyte distribution, using surface treatment technology to improve the surface quality of the cathode roller, and introducing a tension control system.

[0004] However, the above technical solutions all solve the edge tearing problem by adjusting the electroplating process or the stripping process of the electrolytic copper foil, which requires a precise control system and is costly. Especially under the high-speed production process conditions of ultra-thin electrolytic copper foil, local instantaneous tension is easily generated. In this case, the edge part where stress is concentrated is easy to tear. In actual production, most of the edge tearing is caused by the beginning of tearing when a certain point on the edge of the copper foil is stripped, which in turn causes local edge tearing and develops into broken foil. However, it is difficult to further prevent the spread of edge tearing with the existing technology. Once edge tearing occurs, it often causes the production line to shut down, affecting production efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide an anti-tearing edge device for ultra-thin lithium battery copper foil, which can prevent the edge tearing spread and foil breakage problems caused by edge peeling points of ultra-thin electrolytic copper foil during high-speed production in a low-cost and reliable manner.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions:

[0007] An anti-tearing edge device for ultra-thin lithium battery copper foil comprises a bracket, the bracket is used to be fixed to a foil production machine; a support rod, one end of which is passed through the bracket and moves relative to the bracket; a knife holder is arranged at the other end of the support rod; a scraper is detachably fixed to the knife holder; two lasers are respectively arranged on both sides of the scraper, and the plane formed by the laser lines emitted by the two lasers coincides with the tangent plane of the cathode roller peeling point.

[0008] Furthermore: it also includes an elastic device, which is sleeved on the support rod, one end of the elastic device is connected to the bracket, and the other end is connected to the tool holder.

[0009] Furthermore: the elastic device is in a compressed state, so that the scraper keeps applying force toward the cathode roller.

[0010] Furthermore: a fastener is also included, and the fastener is fixed to one end of the support rod close to the bracket.

[0011] Furthermore: the knife holder is provided with a knife groove, and the scraper is fixed in the knife groove.

[0012] Furthermore: the scraper is a flat-head scraper.

[0013] Furthermore: the cutting edge surface of the flat-head scraper is parallel to the tangent plane of the contact point of the cathode roller.

[0014] Furthermore: the scraper protrudes from the edge of the cathode roller by 1-6 mm.

[0015] Furthermore: the length of the scraper along the axial direction of the cathode roller is 21-51 mm.

[0016] The present invention also provides a method for stripping an electrolytic copper foil using the above-mentioned anti-tearing edge device, which is characterized by comprising the following steps:

[0017] S1: Determine the horizontal plane formed by the sum of the tangents of the cathode roller stripping point;

[0018] S2: adjusting the blade edge of the scraper to form the same plane as the laser lines emitted by the two lasers;

[0019] S3: adjusting the height of the support rod so that the plane formed by the cutting edge surface and the laser line coincides with the horizontal plane;

[0020] S4: Fix the fastener.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This device adopts a detachable scraper with an elastic device, so that the scraper can always keep applying force to the cathode roller and fit closely, so as to achieve reliable stripping of the copper foil at the edge of the cathode roller during the production process, effectively preventing the edge tearing of the ultra-thin electrolytic copper foil. This structural design avoids the need to adjust the complex control of the electroplating process or the stripping process in the traditional solution, and reduces the equipment cost.

[0023] Second, by setting lasers on both sides of the scraper, and using the coincidence relationship between the laser line and the tangent plane of the cathode roller stripping point, it is possible to intuitively determine whether the installation position of the scraper is in the optimal stripping state. This design enables operators to promptly detect and adjust the deviation of the scraper position to ensure the stability of the stripping process, thereby effectively reducing the risk of broken foil of ultra-thin electrolytic copper foil and significantly improving the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the front view of the device;

[0025] Figure 2 It is a side view schematic diagram of the device;

[0026] Figure 3 This is a working schematic diagram of the device when peeling off the copper foil;

[0027] In the figure:

[0028] 1. Bracket; 2. Fastener; 3. Strut; 4. Elastic device; 5. Knife holder; 6. Scraper; 7. Laser line; 8. Cathode roller; 9. Laser; 10. Electrolytic copper foil. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] An anti-tearing edge device for ultra-thin lithium battery copper foil comprises a bracket 1, the bracket 1 is used to be fixed to a foil production machine; a support rod 3, one end of which is passed through the bracket 1 and moves relative to the bracket 1; a knife holder 5 is arranged at the other end of the support rod 3; a scraper 6 is detachably fixed to the knife holder 5; two lasers 9 are respectively arranged on both sides of the scraper 6, and the plane formed by the laser lines 7 emitted by the two lasers 9 coincides with the tangent plane of the stripping point of the cathode roller 8.

[0032] It also includes an elastic device 4, which is sleeved on the support rod 3, one end of the elastic device 4 is connected to the bracket 1, and the other end is connected to the blade holder 5. The elastic device 4 is in a compressed state, so that the scraper 6 keeps applying force toward the cathode roller 8.

[0033] It also includes a fastener 2, which is fixed to one end of the support rod 3 close to the bracket 1. The blade holder 5 is provided with a blade groove, and the scraper 6 is fixed in the blade groove. The scraper 6 is a flat-headed scraper 6. The edge surface of the flat-headed scraper 6 is parallel to the tangent plane of the contact point of the cathode roller 8. The scraper 6 protrudes from the edge of the cathode roller 8 by 1-6 mm. The length of the scraper 6 along the axial direction of the cathode roller 8 is 21-51 mm.

[0034] The present invention also provides a method for stripping an electrolytic copper foil using the above-mentioned anti-tearing edge device, which is characterized by comprising the following steps:

[0035] S1: Determine the horizontal plane formed by the sum of the tangent lines of the stripping point of the cathode roller 8;

[0036] S2: Adjust the edge surface of the scraper 6 to form the same plane with the laser lines 7 emitted by the two lasers 9;

[0037] S3: adjusting the height of the support rod 3 so that the plane formed by the cutting edge surface and the laser line 7 coincides with the horizontal plane;

[0038] S4: Fix the fastener 2.

[0039] The working principle of the present invention is as follows:

[0040] When the ultra-thin electrolytic copper foil tear-proof edge device of the present invention is used, the bracket 1 is first fixed on the foil machine, and the bracket 1 is used to provide a stable installation base for the entire device. One end of the support rod 3 is passed through the bracket 1 and fixed by the fastener 2, so that the height of the support rod 3 can be adjusted relative to the bracket 1. The other end of the support rod 3 is connected to the knife frame 5, and the knife frame 5 is provided with a knife groove for fixing the scraper 6. The scraper 6 is detachably mounted on the knife frame 5 through the knife groove, which is convenient for replacing scrapers 6 of different specifications according to actual needs.

[0041] An elastic device 4 in a compressed state is sleeved on the support rod 3, one end of the elastic device 4 is connected to the bracket 1, and the other end is connected to the knife holder 5. Through the compression of the elastic device 4, the scraper 6 always keeps applying force toward the cathode roller 8, thereby ensuring that the scraper 6 can closely fit the surface of the cathode roller 8. This design enables the scraper 6 to adapt to slight changes in the surface of the cathode roller 8 and maintain a stable peeling effect.

[0042] The present invention adopts a flat-head scraper 6, whose edge surface is parallel to the tangent plane of the contact point of the cathode roller 8. The scraper 6 protrudes from the edge of the cathode roller 8 by 1-6 mm. The setting of this protrusion ensures the effective stripping of the copper foil on the edge without affecting the normal production area. The length of the scraper 6 along the axial direction of the cathode roller 8 is 21-51 mm. The setting of this length range can ensure a sufficient stripping area without causing excessive resistance.

[0043] Two lasers 9 are arranged on both sides of the scraper 6, and the laser lines 7 emitted by the two lasers 9 form a plane. In actual use, by adjusting the height of the support rod 3, the plane formed by the laser line 7 coincides with the tangent plane of the stripping point of the cathode roller 8, and coincides with the edge surface of the scraper 6. This three-surface coincidence position relationship provides an intuitive position reference for the operator, which helps to adjust the scraper 6 to the optimal stripping position.

[0044] When the production of electrolytic copper foil 10 begins, scraper 6 is in close contact with cathode roller 8, and the copper foil at the edge of cathode roller 8 is continuously peeled off under the action of elastic device 4. Due to the precise control of the position of scraper 6 and the continuous and stable peeling force, the edge copper foil can be peeled off at the early stage of formation, thereby preventing the occurrence and spread of edge tearing. At the same time, the operator can judge whether the peeling state is in the best state at any time by observing the position relationship between laser line 7 and the edge surface, and can optimize the peeling effect by adjusting the height of support rod 3 or replacing scraper 6 when necessary.

[0045] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-tearing edge device for ultra-thin lithium battery copper foil, characterized in that: The invention comprises a bracket, which is used to be fixed to a foil machine; a support rod, one end of which is passed through the bracket and moves relatively with the bracket; a knife holder, which is arranged at the other end of the support rod; a scraper, which is detachably fixed to the knife holder; and two lasers, which are respectively arranged on both sides of the scraper, and the plane formed by the laser lines emitted by the two lasers coincides with the tangent plane of the cathode roller peeling point.

2. The anti-tearing edge device of an ultra-thin lithium battery copper foil according to claim 1, characterized in that: Also includes: An elastic device is sleeved on the support rod, one end of the elastic device is connected to the bracket, and the other end is connected to the tool holder.

3. The anti-tearing edge device of an ultra-thin lithium battery copper foil according to claim 2, characterized in that: The elastic device is in a compressed state, so that the scraper keeps applying force toward the cathode roller.

4. The anti-tearing edge device of an ultra-thin lithium battery copper foil according to claim 1, characterized in that: Also includes: A fastener is fixed to one end of the support rod close to the bracket.

5. The anti-tearing edge device of an ultra-thin lithium battery copper foil according to claim 1, characterized in that: The knife holder is provided with a knife groove, and the scraper is fixed in the knife groove.

6. The anti-tearing edge device of an ultra-thin lithium battery copper foil according to claim 1, characterized in that: The scraper is a flat-head scraper.

7. The anti-tearing edge device of the ultra-thin lithium battery copper foil according to claim 6, characterized in that: The cutting edge of the flat-head scraper is parallel to the tangent plane of the contact point of the cathode roller.

8. The anti-tearing edge device of an ultra-thin lithium battery copper foil according to claim 1, characterized in that: The scraper protrudes from the edge of the cathode roller by 1-6 mm.

9. The anti-tearing edge device of an ultra-thin lithium battery copper foil according to claim 1, characterized in that: The length of the scraper along the axial direction of the cathode roller is 21-51 mm.

10. A method for stripping electrolytic copper foil using the anti-tearing edge device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Determine the horizontal plane formed by the sum of the tangents of the cathode roller stripping point; S2: adjusting the blade edge of the scraper to form the same plane as the laser lines emitted by the two lasers; S3: adjusting the height of the support rod so that the plane formed by the cutting edge surface and the laser line coincides with the horizontal plane; S4: Fix the fastener.

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