KR-20260064053-A - Electrode sheet winding device and electrode sheet winding method using it

KR20260064053AKR 20260064053 AKR20260064053 AKR 20260064053AKR-20260064053-A

Abstract

The present invention relates to an electrode sheet winding device capable of increasing the adhesion between an electrode and a separator during a winding process for winding an electrode and a separator, and an electrode sheet winding method using the same. An electrode sheet winding device according to an embodiment of the present invention includes a center roller and a pressure roller. The center roller winds the electrode sheet. The electrode sheet may include an electrode comprising a positive electrode and a negative electrode, and a separator interposed between the positive electrode and the negative electrode. The pressure roller is installed spaced apart from the central axis of the center roller and can increase the adhesion force between the electrode and the separator by pressing the electrode sheet wound by the center roller.

Inventors

이병규
이승현
김유배
가경륜

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260507
Application Date: 20241031

Claims (15)

A center roller for winding an electrode sheet comprising an electrode including an anode and a cathode, and a separator interposed between the anode and the cathode; and An electrode sheet winding device comprising: a pressure roller installed spaced apart from the central axis of the center roller, and applying pressure to the electrode sheet wound by the center roller to increase the adhesion force between the electrode and the separator.
In paragraph 1, The above pressure roller is one, and The electrode sheet winding device is characterized in that the above-mentioned pressure roller is installed at the winding start point where the electrode sheet begins to be wound onto the center roller.
In paragraph 1, The above-mentioned pressure rollers are a plurality of two or more, and Among the plurality of pressure rollers, the first pressure roller is installed at the winding start point where the electrode sheet begins to be wound onto the center roller, and An electrode sheet winding device characterized in that among a plurality of pressure rollers, the second pressure roller is installed on the uppermost surface of the center roller.
In paragraph 3, The pressure of the first pressure roller and the second pressure roller is set differently, and An electrode sheet winding device characterized in that the pressing force of the second pressing roller is greater than the pressing force of the first pressing roller.
In paragraph 3, An electrode sheet winding device comprising a third pressure roller installed between the first pressure roller and the second pressure roller, wherein the first pressure roller, the third pressure roller, and the second pressure roller are sequentially installed along the winding direction of the center roller.
In paragraph 5, The pressing force of the second pressing roller is greater than the pressing force of the third pressing roller, and An electrode sheet winding device characterized in that the pressing force of the third pressing roller is greater than the pressing force of the first pressing roller.
In paragraph 1, The above-mentioned pressure rollers are a plurality of two or more, and Among the plurality of pressure rollers, the first pressure roller is installed at the winding start point where the electrode sheet begins to be wound onto the center roller, and An electrode sheet winding device characterized in that the remaining pressure rollers are installed at equal intervals along the winding direction of the center roller on a virtual circle with the center axis and the first pressure roller as the radius, with the first pressure roller as the starting point and the ending point.
In Paragraph 7, An electrode sheet winding device characterized in that the pressure of the first pressure roller is the smallest, and the pressure of the remaining pressure rollers installed sequentially along the winding direction of the center roller gradually increases.
In paragraph 1, An electrode sheet winding device characterized by including a pressure roller driving unit that moves the pressure roller in a radial direction as the thickness of the electrode assembly manufactured by winding the electrode sheet by the center roller increases, thereby preventing the pressure applied by the pressure roller to the electrode assembly from becoming excessive.
In Paragraph 9, The above-mentioned pressure roller drive unit is, A pressure sensor that detects pressure applied to the pressure roller by the electrode assembly, and An electrode sheet winding device characterized by including an actuator that moves the pressure roller in a radial direction according to the pressure value detected by the pressure sensor.
In Paragraph 10, The electrode sheet winding device is characterized by the actuator moving the pressure roller in a radial direction so that the pressure value detected by the pressure sensor is maintained constant.
In paragraph 1, An electrode sheet winding device characterized in that the center roller is made of metal and the pressure roller is made of metal or rubber.
An electrode sheet manufacturing step comprising an electrode including an anode and a cathode, and a separator interposed between the anode and the cathode; A winding step of winding the electrode sheet using a center roller; and A method for winding an electrode sheet, comprising a pressure step of applying pressure to the electrode sheet being wound using a pressure roller to increase the adhesion force between the electrode and the separator.
In Paragraph 13, In the above pressurization step The pressure applied at the winding start point where the electrode sheet begins to be wound onto the center roller is the smallest, and An electrode sheet winding method characterized by gradually increasing the pressure along the winding direction of the center roller.
In Paragraph 13, An electrode sheet winding method characterized by including a pressure roller movement step in which, after detecting the pressure applied to the pressure roller by the electrode assembly manufactured by winding the center roller, the pressure roller is moved back and forth in a radial direction by an actuator according to the detected pressure value.

Description

Electrode sheet winding device and electrode sheet winding method using it The present invention relates to an electrode sheet winding device capable of increasing the adhesion between an electrode and a separator during a winding process for winding an electrode and a separator, and an electrode sheet winding method using the same. Secondary batteries, which possess electrical characteristics such as high energy density and high applicability across product categories, are widely applied not only to portable devices but also to electric vehicles (EVs) and hybrid electric vehicles (HEVs) driven by electric power sources. These secondary batteries are attracting attention as a new energy source for improving eco-friendliness and energy efficiency, as they not only have the primary advantage of being able to drastically reduce the use of fossil fuels but also the advantage of not generating any by-products from the use of energy. Currently, widely used types of secondary batteries include lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and nickel-zinc batteries. The operating voltage of these unit secondary battery cells is approximately 2.5V to 4.5V. Therefore, if a higher output voltage is required, a battery module or battery pack is configured by connecting multiple battery cells in series. Additionally, a battery module or battery pack is configured by connecting multiple battery cells in parallel depending on the required charge/discharge capacity. Accordingly, the number of battery cells included in the battery module or battery pack and the electrical connection type can be varied according to at least one of the required output voltage and charge/discharge capacity. Cylindrical, prismatic, and pouch-type battery cells are known as types of secondary battery cells. In the case of cylindrical battery cells, an electrode sheet with an insulating separator interposed between the positive and negative electrodes is wound using a winding roller to form a jellyroll-shaped electrode assembly, which is then inserted into a battery can along with an electrolyte to constitute a battery. Additionally, in cylindrical battery cells, current collectors may be used to electrically connect the positive and negative electrodes, respectively. FIG. 1 is a perspective view showing a center roller according to the prior art. Referring to FIG. 1, a conventional winding roller (1) winds an electrode sheet (S) guided by a guide roller (2) in one direction (e.g., counterclockwise) to form a jelly roll-shaped electrode assembly (EA). In order to manufacture such a jelly roll-shaped electrode assembly (EA), the tension is controlled during the process of winding the electrode sheet (S) so as not to damage the electrode and the separator, but this results in a problem where there is a limit to the adhesion between the electrode and the separator. FIG. 1 is a perspective view showing a winding roller according to the prior art. FIG. 2 is a drawing showing an electrode assembly manufacturing apparatus including a winding device according to embodiments of the present invention. FIG. 3 is a perspective view showing a winding device according to a first embodiment of the present invention. FIG. 4 is a side view showing a winding device according to a first embodiment of the present invention. FIG. 5 is a perspective view showing a winding device according to a second embodiment of the present invention. FIG. 6 is a side view showing a winding device according to a second embodiment of the present invention. FIG. 7 is a perspective view showing a winding device according to a third embodiment of the present invention. FIG. 8 is a side view showing a winding device according to a third embodiment of the present invention. FIGS. 9 and FIGS. 10 are side views illustrating a winding device according to a fourth embodiment of the present invention. Figure 11 is a cross-sectional view taken along the A-A' line of Figure 9. FIG. 12 is a flowchart illustrating an electrode sheet winding method according to an embodiment of the present invention. The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. The terms used in this invention are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this invention, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification