A method of winding a porous copper foil

Abstract

The present application belongs to the technical field of metal electrolytic foil production, and particularly relates to a winding method of porous copper foil. In order to solve the problem of wrinkle in the porous area of the winding shaft, the method comprises the following steps: selecting an ultrathin lithium battery copper foil as the winding object; using a physical method to make a porous area on the surface of the ultrathin lithium battery copper foil, and continuously winding the porous area during winding; excluding the influence factors of irrelevant variables, i.e. adjusting the parallelism and tension between the peeling roller, the guide roller, each tension roller and the ultrathin lithium battery copper foil; when the ultrathin lithium battery copper foil passes through the cutter roller, the porous area is cut out separately by using the cutter.

Description

Technical Field

[0001] This invention belongs to the field of metal electrolytic foil technology, specifically relating to a method for winding porous copper foil. Background Technology

[0002] With the rapid development of the electronics and information industry and the power battery industry in recent years, the demand for copper foil has been increasing steadily. In the electronics industry, copper foil is a major material for copper clad laminates (CCL) and printed circuit boards (PCBs). In the energy storage field, the excellent conductivity of copper foil makes it one of the important raw materials for lithium battery current collectors. Among the methods of producing copper foil, electrodeposition has become the mainstream process for copper foil production both domestically and internationally due to its advantages in cost and process.

[0003] To improve the energy storage performance of batteries, copper foil with micropores has been developed. To meet the requirement of continuous winding production of porous copper foil, the copper foil in the porous areas needs to be processed during winding to prepare porous copper foil of the required width and length. Because the areal density of the copper foil in the porous areas is uneven compared to other areas, the tension on the same sheet of foil varies during winding, which easily leads to wrinkling. This results in poor copper foil winding and production disruptions. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes a method for winding porous copper foil. This method effectively solves the problem of wrinkling in porous copper foil, increases the continuous winding length of porous copper foil, and improves the production efficiency of porous copper foil.

[0005] To achieve the above-mentioned technical objectives, the technical solution of the present invention is implemented as follows:

[0006] A method for winding porous copper foil includes the following steps:

[0007] Step 1: Select ultra-thin lithium-ion battery copper foil as the winding material. As power batteries develop towards lighter weight (reducing weight by 30%~40% compared to existing designs) and longer driving range, it is necessary to improve the negative electrode current collector. Creating regularly spaced holes on the ultra-thin lithium-ion battery copper foil helps improve the current collection capacity of the negative electrode material and enhances its conductivity, while simultaneously reducing battery weight. Weight reduction using ultra-thin lithium-ion battery copper foil is a core competitive advantage for leading battery manufacturers.

[0008] Step 2: Use physical methods to create porous areas on the surface of ultra-thin lithium battery copper foil, and continuously wind up the porous areas during the winding process.

[0009] Step 3: Eliminate the influence of irrelevant variables, that is, adjust the parallelism and tension between the stripping roller, guide roller, tension rollers and ultra-thin lithium battery copper foil; because the surface density of the porous area is very different from that of other areas, the copper foil is very sensitive to the tension of each roller during production. Inconsistency in the parallelism and tension between the rollers and the copper foil will affect the winding effect of the porous copper foil.

[0010] Step 4: When the ultra-thin lithium battery copper foil passes through the cutting roller, the porous area is cut out separately using a cutter.

[0011] Furthermore, the thickness of the ultra-thin lithium-ion battery copper foil in step 1 is 5~6μm.

[0012] Furthermore, in step 2, the width of the porous region is 100mm~300mm, the diameter of the pores is 100~500μm, and the spacing between the pores is 400~800μm.

[0013] Furthermore, in step 2, a porous region is created on the surface of the ultra-thin lithium-ion battery copper foil using a physical method. Specifically, the method is as follows:

[0014] Applying glue to create dots on the cathode roller provides insulation against current, preventing the deposition of copper from CuSO4 on the cathode roller and thus forming porous areas. This allows for sustainable production winding.

[0015] Furthermore, in step 2, the continuous winding reaches 3000~5000m.

[0016] Furthermore, in step 4, a cutter is used to cut out the porous area separately. The specific method is as follows:

[0017] Place a cutter on each side of the porous area to cut it apart from the other areas. Use two take-up rollers to take up the ultra-thin lithium-ion battery copper foil from the porous area, and the other roller to take up the ultra-thin lithium-ion battery copper foil from the other areas. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a front view of the winding device, where: ①-cutting roller; ②-winding roller 1; ③-winding roller 2; ④-perforated foil; ⑤-non-perforated foil;

[0020] Figure 2 This is a side view of the winding device, where: ① - winding path of porous foil; ② - winding path of non-porous foil;

[0021] Figure 3 This is an isometric schematic diagram of the entire winding device. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0023] Utilize Figure 1 The winding device shown in Figure 3 implements a winding method for porous copper foil according to this embodiment, including the following steps:

[0024] Step 1: Select ultra-thin lithium battery copper foil as the winding object, with a thickness of 5~6μm;

[0025] Step 2: Create porous regions on the surface of ultra-thin lithium-ion battery copper foil using physical methods: Apply adhesive to create dots on the cathode roller. These dots provide insulation against current, preventing CuSO4 from depositing copper on the cathode roller, thus forming porous regions. The width of the porous regions is 100mm~300mm, the diameter of the holes is 100~500μm, and the spacing between the holes is 400~800μm. During winding, the porous regions are continuously wound and can be independently wound for 3000~5000m.

[0026] Step 3: Eliminate the influence of irrelevant variables, that is, adjust the parallelism and tension between the stripping roller, guide roller, tension rollers and ultra-thin lithium battery copper foil;

[0027] Step 4: When the ultra-thin lithium-ion battery copper foil passes through the cutting roller, use the cutter to cut out the porous area separately: place a cutter on each side of the porous area to cut the porous area apart from other areas, and use two take-up rollers to take it up. One roller takes up the ultra-thin lithium-ion battery copper foil of the porous area, and the other roller takes up the ultra-thin lithium-ion battery copper foil of other areas.

[0028] In practice: Example 1

[0029] The porous area of ​​the ultra-thin lithium-ion battery copper foil is located in the center, with a width of 100mm, a hole diameter of 100μm, and a hole spacing of 400μm. It is wound onto winding roller 2. The other areas are symmetrical on both sides and wound onto winding roller 1. After removing the feed material, the foil is divided into 3 parts. Experimental results show that the porous foil can be wound up to about 3000m, and the winding condition is good. Example 2

[0030] The porous area of ​​the ultra-thin lithium-ion battery copper foil is located in the center, with a width of 200mm, a hole diameter of 200μm, and a hole spacing of 500μm. It is wound onto winding roller 2. The other areas are symmetrical on both sides and wound onto winding roller 1. After removing the feed material, the foil is divided into 3 parts. Experimental results show that the porous foil is wound up to approximately 2800m, and the winding condition is good. Example 3

[0031] The porous area of ​​the ultra-thin lithium-ion battery copper foil is located in the center, with a width of 300mm, a hole diameter of 300μm, and a hole spacing of 600μm. It is wound onto winding roller 2. The other areas are symmetrical on both sides and wound onto winding roller 1. After removing the feed material during winding, the foil is divided into 3 parts. Experimental results show that the porous foil can be wound up to approximately 2500m, and the winding condition is good. Example 4

[0032] The porous area of ​​the ultra-thin lithium-ion battery copper foil is located at the gear end, with a width of 100mm, a hole diameter of 400μm, and a hole spacing of 700μm. It is wound onto take-up roller 2. The other areas are located at the non-gear end and are wound onto take-up roller 1. After removing the feed material during winding, the foil is divided into two parts. Experimental results show that the porous foil can be wound up to approximately 3500m, and the winding condition is good. Example 5

[0033] The porous area of ​​the ultra-thin lithium-ion battery copper foil is located at the gear end, with a width of 200mm, a hole diameter of 500μm, and a hole spacing of 800μm. It is wound onto take-up roller 2. The other areas are located at the non-gear end and are wound onto take-up roller 1. After removing the feed material during winding, the foil is divided into two parts. Experimental results show that the porous foil can be wound up to approximately 3000m, and the winding condition is good. Example 6

[0034] The porous area of ​​the ultra-thin lithium-ion battery copper foil is located at the gear end, with a width of 300mm, a hole diameter of 100μm, and a hole spacing of 400μm. It is wound onto take-up roller 2. The other areas are located at the non-gear end and are wound onto take-up roller 1. After removing the feed material during winding, the foil is divided into two parts. Experimental results show that the porous foil is wound to approximately 2700m, and the winding condition is good.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for winding porous copper foil, characterized in that, Includes the following steps: Step 1: Select ultra-thin lithium battery copper foil as the winding object, wherein the thickness of the ultra-thin lithium battery copper foil is 5~6μm; Step 2: Use physical methods to create porous areas on the surface of ultra-thin lithium battery copper foil. During winding, the porous areas are also continuously wound. The width of the porous areas is 100mm~300mm, the diameter of the holes is 100~500μm, and the spacing between the holes is 400~800μm. Step 3: Eliminate the influence of irrelevant variables, that is, adjust the parallelism and tension between the stripping roller, guide roller, tension rollers and ultra-thin lithium battery copper foil; Step 4: When the ultra-thin lithium-ion copper foil passes through the cutting roller, use the cutter to cut out the porous area separately; place a cutter on each side of the porous area to cut the porous area apart from the other areas, and use two take-up rollers to take it up, one to take up the ultra-thin lithium-ion copper foil of the porous area and the other to take up the ultra-thin lithium-ion copper foil of the other areas.

2. The method for winding porous copper foil according to claim 1, characterized in that, In step 2, a porous region is created on the surface of the ultra-thin lithium-ion battery copper foil using a physical method. The specific method is as follows: Apply glue to create dots on the cathode roller. These dots act as insulation against current, preventing CuSO4 from depositing copper on the cathode roller and thus forming a porous region.

3. The method for winding porous copper foil according to claim 1, characterized in that, In step 2, the continuous winding reaches 3000~5000m.

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