CN-122013264-A - Electrolytic foil producing machine conductive structure and method for reducing copper foil warpage

CN122013264ACN 122013264 ACN122013264 ACN 122013264ACN-122013264-A

Abstract

The invention relates to the technical field of electrolytic lithium electric copper foil manufacturing, and discloses an electrolytic foil producing machine conductive structure and a method for reducing copper foil warpage, wherein the electrolytic foil producing machine conductive structure comprises a power supply, a rectifier, a plurality of copper plates, a plurality of anode plates electrically connected with the copper plates one by one, electrolyte and a cathode roller; the current flow direction of the conductive structure of the electrolytic foil producing machine is that a power supply anode, a rectifier, a copper plate, an anode plate, electrolyte, a cathode roller and a power supply cathode. In the invention, the deposition rate and grain growth of the copper foil at different positions of the roller surface are regulated and controlled differentially by independently controlling the current of each anode plate directly in the electrolytic deposition process, so that the warping direction of the copper foil is guided accurately or the warping degree of the copper foil is restrained in an extremely low range.

Inventors

NIE TAO
XU FEI
YANG SHUAIGUO
Xing Taotao

Assignees

九江德富新能源有限公司
九江德福科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260113

Claims (10)

1. The conductive structure of the electrolytic foil producing machine is characterized by comprising a power supply, a rectifier, a plurality of copper plates, a plurality of anode plates electrically connected with the copper plates one by one, electrolyte and a cathode roller; The current flow direction of the conductive structure of the electrolytic foil producing machine is that a power supply anode, a rectifier, a copper plate, an anode plate, electrolyte, a cathode roller and a power supply cathode.
2. The electrolytic foil generator conductive structure of claim 1, wherein each of the plurality of anode plates is electrically connected to the rectifier by an independent copper plate, and the electrical connection between each anode plate and the corresponding copper plate is in a parallel relationship such that the current applied to each anode plate can be independently controlled.
3. An electrolytic foil machine conductive structure according to claim 1, wherein an insulating layer is provided between the anode plate and an anode tank containing the electrolyte.
4. An electrolytic foil machine conductive structure according to claim 1, wherein the anode plate is conductively connected to its corresponding copper plate by a stud, and current is directly conducted to the anode plate via the stud without flowing through the anode tank.
5. The electrolytic foil machine conductive structure of claim 1, wherein the plurality of anode plates are divided into at least two different current application groups along the axial direction of the cathode roller, the current values applied by the different current application groups being different from each other.
6. The electrolytic foil machine conductive structure of claim 5, wherein the plurality of anode plates are divided into three groups of current application groups, a first group, a second group and a third group, respectively, the first group and the third group being located at both ends in an axial direction of the cathode roller, the second group being located between the first group and the third group, wherein a value of current applied to the second group of anode plates is larger than a value of current applied to the first group and the third group of anode plates.
7. The electrolytic foil machine conductive structure of claim 6, wherein the current applied to the second set of anode plates is 3 to 4 times the current applied to the first or third set of anode plates.
8. The electrolytic foil generator conductive structure according to claim 7, wherein the number of anode plates is 18, the first to sixth anode plates are the first group of anode plates, the seventh to fourteenth anode plates are the second group of anode plates, the fifteenth to eighteenth anode plates are the third group of anode plates, and the current applied by the first group of anode plates and the third group of anode plates is the same along the axial direction of the cathode roller.
9. An electrolytic foil generator comprising an electrolytic foil generator conductive structure according to any one of claims 1 to 8.
10. A method for reducing warpage of a copper foil comprising the steps of: Establishing a conductive loop to enable current to flow from the positive electrode of a power supply to the cathode roller through a rectifier, a plurality of copper plates which are connected in parallel and independently, an anode plate which is electrically connected with the copper plates one by one, and electrolyte, and returning to the negative electrode of the power supply, wherein the anode plate is electrically insulated from an anode tank containing the electrolyte; Independently controlling the magnitude of current applied to each anode plate through the plurality of parallel and independent conductive paths; The copper foil layers deposited and generated at different positions in the axial direction of the cathode roller have different crystal size distribution by adjusting the magnitude of the current applied to different anode plates, so that the overall warping direction and degree of the finished copper foil are controlled.

Description

Electrolytic foil producing machine conductive structure and method for reducing copper foil warpage Technical Field The invention relates to the technical field of electrolytic lithium electric copper foil manufacturing, in particular to a conductive structure of an electrolytic foil producing machine and a method for reducing copper foil warpage. Background At present, the warping of the lithium battery copper foil is generally larger than 15-20mm, and in the battery lamination process, the risk of unrecognized tab collapse exists. In a copper foil factory, a large number of ovens are required to bake copper foil in order to control warpage, and the time and electricity costs are enormous. There is an urgent need to improve the existing devices to reduce the warpage of copper foil. Disclosure of Invention The invention mainly aims to solve the technical problem that the warping of a lithium battery copper foil is generally larger in the prior art. The invention provides a conductive structure of an electrolytic foil producing machine, which comprises a power supply, a rectifier, a plurality of copper plates, a plurality of anode plates electrically connected with the copper plates one by one, electrolyte and a cathode roller, wherein the current flow direction of the conductive structure of the electrolytic foil producing machine is positive power supply, the rectifier, the copper plates, the anode plates, the electrolyte, the cathode roller and negative power supply. In a second aspect, the invention provides an electrolytic foil generator comprising the electrolytic foil generator conductive structure described above. In a third aspect, the present invention provides a method for reducing warpage of a copper foil, comprising: Establishing a conductive loop to enable current to flow from the positive electrode of a power supply to the cathode roller through a rectifier, a plurality of copper plates which are connected in parallel and independently, an anode plate which is electrically connected with the copper plates one by one, and electrolyte, and returning to the negative electrode of the power supply, wherein the anode plate is electrically insulated from an anode tank containing the electrolyte; Independently controlling the magnitude of current applied to each anode plate through the plurality of parallel and independent conductive paths; The copper foil layers deposited and generated at different positions in the axial direction of the cathode roller have different crystal size distribution by adjusting the magnitude of the current applied to different anode plates, so that the overall warping direction and degree of the finished copper foil are controlled. The invention has the following beneficial effects: in the invention, the deposition rate and grain growth of the copper foil at different positions of the roller surface are regulated and controlled differentially by independently controlling the current of each anode plate directly in the electrolytic deposition process, so that the warping direction of the copper foil is guided accurately or the warping degree of the copper foil is restrained in an extremely low range. Drawings Fig. 1 is a schematic view of warpage in example 1 of the present invention. Fig. 2 is a schematic view of warpage in example 2 of the present invention. Fig. 3 is a schematic view of warpage in example 3 of the present invention. Fig. 4 is a warp schematic diagram of example 4 of the present invention. Fig. 5 is a schematic view of warpage in example 5 of the present invention. FIG. 6 is a schematic diagram of a conventional foil producing machine. Fig. 7 is a schematic diagram of the conducting mode of the foil producing machine according to the scheme of the invention. Detailed Description The terms "first," "second," "third," "fourth," and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus. The traditional foil producing machine conducting mode is that the current flows to a closed loop, namely the positive electrode of a power supply, a rectifier, a copper plate, an anode tank, an anode plate, electrolyte, a cathode roller and the negative electrode of the power supply, as shown in figure 6. For ease of understanding, a specific f