KR-20260063304-A - UNIT CELL MANUFACTURING DEVICE

KR20260063304AKR 20260063304 AKR20260063304 AKR 20260063304AKR-20260063304-A

Abstract

A unit cell manufacturing device according to one embodiment of the present invention is a unit cell manufacturing device for manufacturing an electrode stack in which a first separator sheet, a first electrode plate, a second separator sheet, and a second electrode plate are sequentially stacked as a unit cell, and comprises a pair of roller parts disposed respectively on the upper and lower portions of the electrode stack and pressurizing and heating the electrode stack, wherein the plurality of electrode stacks are spaced apart at equal intervals and are sequentially fed between the pair of roller parts, and at least one outer surface of the pair of roller parts includes a plurality of grooves spaced apart from the pressurizing surface, and as the roller part including the plurality of grooves rotates, the grooves are positioned on the same vertical line as the center between adjacent pairs of electrode stacks among the plurality of electrode stacks.

Inventors

김필수
조성남
김상건
고현우
모지수

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260507
Application Date: 20241030

Claims (15)

A unit cell manufacturing apparatus for manufacturing an electrode laminate in which a first separator sheet, a first electrode plate, a second separator sheet, and a second electrode plate are sequentially stacked as a unit cell, wherein It includes a pair of roller parts disposed respectively on the upper and lower parts of the electrode stack and pressurizing and heating the electrode stack, The plurality of electrode stacks are spaced apart at equal intervals and are each sequentially fed between the pair of roller parts, and At least one outer surface of the above pair of roller parts includes a plurality of grooves spaced apart from the pressing surface, and A unit cell manufacturing device in which, as the roller part including a plurality of grooves rotates, the grooves are positioned on the same vertical line as the center between a pair of adjacent electrode stacks among the plurality of electrode stacks.
In paragraph 1, In the roller portion having the plurality of grooves formed therein, A unit cell manufacturing device in which the plurality of grooves are spaced apart at equal intervals along the rotational direction of the roller portion.
In paragraph 1, A unit cell manufacturing device in which, as the roller portion including a plurality of grooves rotates, the grooves are positioned on the same vertical line as the center between the second electrode plates included in each of a pair of adjacent electrode stacks.
In Paragraph 1, In the roller portion having the plurality of grooves formed therein, A unit cell manufacturing device in which, based on the rotational direction of the roller portion, the distance between a pair of adjacent groove portions among the plurality of groove portions is equal to or greater than the length of one of the first electrode plate and the second electrode plate.
In paragraph 1, In the roller portion having the plurality of grooves formed therein, A unit cell manufacturing device in which, based on the rotational direction of the roller portion, the size of the groove portion is equal to or greater than the gap between the second electrode plates included in each of a pair of adjacent electrode stacks.
In Paragraph 1, In the roller portion having the plurality of grooves formed therein, A unit cell manufacturing device in which each of the above-mentioned plurality of grooves extends along the thickness direction of the roller portion.
In paragraph 1, In the roller portion having the plurality of grooves formed therein, A unit cell manufacturing device in which each of the above plurality of grooves is recessed in a direction toward the center of the roller part from the outer surface of the roller part.
In Paragraph 7, In the roller portion having the plurality of grooves formed therein, A unit cell manufacturing device having a plurality of grooves, each having a semicircular shape.
In Paragraph 7, In the roller portion having the plurality of grooves formed therein, A unit cell manufacturing device in which the boundary between the plurality of grooves and the pressure surface is each gently chamfered.
In paragraph 1, The sensor unit further includes information regarding the spacing between the plurality of electrode stacks. A unit cell manufacturing device in which, based on information obtained from the sensor unit, the rotational speed of the pair of roller units is controlled so that the center of the groove unit is positioned on the same vertical line as the center between adjacent pairs of electrode stacks among the plurality of electrode stacks.
In paragraph 1, It further includes a sensor unit for acquiring information about the gap between the second electrode plates included in each of a pair of adjacent electrode stacks, and A unit cell manufacturing device in which, based on information obtained from the sensor unit, the rotational speed of the pair of roller units is controlled so that the center of the groove unit is positioned on the same vertical line as the center between the second electrode plates included in each of the pair of adjacent electrode stacks.
In paragraph 1, A unit cell manufacturing device in which the first electrode plate is an anode plate and the second electrode plate is a cathode plate.
In paragraph 1, A unit cell manufacturing device comprising, among the above pair of roller parts, a roller part located on the upper part of the electrode stack, the pressure surface and the plurality of grooves.
In paragraph 1, A unit cell manufacturing device comprising both the above pair of roller parts and the above pressing surface and the above plurality of grooves.
In Paragraph 1, In the above plurality of electrode stacks, A plurality of the first electrode plates are spaced apart from each other on the first separator sheet, and a plurality of the second electrode plates are spaced apart from each other on the second separator sheet. A unit cell manufacturing device in which a plurality of first electrode plates and a plurality of second electrode plates are each positioned facing each other.

Description

Unit Cell Manufacturing Device The present invention relates to a unit cell manufacturing apparatus, and more specifically, to a unit cell manufacturing apparatus that sufficiently secures adhesion between an electrode plate and a separator sheet included in an electrode laminate, while mitigating the impact applied to the step portion between the electrode plate and the separator sheet located on the long side of the electrode laminate. With the increasing technological development and demand for mobile devices, the demand for secondary batteries as an energy source is rapidly rising. Among these secondary batteries, lithium secondary batteries, which possess high energy density and voltage, long cycle life, and low self-discharge rate, have been commercialized and are widely used. These secondary batteries are classified according to the shape of the battery case into cylindrical and prismatic batteries, in which the electrode stack is embedded in a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode stack is embedded in a pouch-type case made of an aluminum laminate sheet. Here, the electrode stack embedded in the battery case is a power generation element capable of charging and discharging, consisting of a positive electrode, a negative electrode, and a separator structure interposed between the positive and negative electrodes. It is classified into a jelly-roll type, which is wound with a separator interposed between long sheet-type positive and negative electrodes coated with active material, and a stack type, in which a plurality of positive and negative electrodes are sequentially stacked with a separator interposed between them. Among these, pouch-type batteries, in particular those with a structure in which a stacked or stacked/folded electrode laminate is embedded in a pouch-type battery case made of aluminum laminate sheets, are seeing a gradual increase in usage due to reasons such as low manufacturing costs, small weight, and easy deformation. Among stacked electrode laminates, in order to manufacture a lamination and stack (L&S) type electrode laminate in which unit cells are first manufactured using anodes, separators, and cathodes and then stacked, unit cells must be manufactured first. Generally, to manufacture a unit cell, while the central electrode moves in one direction by means of a conveyor belt or the like, a separator is laminated on the upper and lower surfaces of the central electrode, respectively, and subsequently, an upper electrode is laminated on top. In some cases, a lower electrode may be laminated on the bottom. Then, a laminating process is performed by applying heat and pressure to the laminated body in which the electrodes and separators are laminated. As this laminating process is performed, the electrodes and separators are bonded together, allowing the unit cell to be firmly formed. However, there is a problem in that when the electrode stack is introduced into the lamination process, lithium plating (Li-plating) occurs due to breakage or detachment of the electrode caused by the impact generated when the step area between the electrode and the separator located on the long side of the electrode stack comes into contact with the lamination roller. Accordingly, there is a need to develop a unit cell manufacturing device that sufficiently secures the adhesion between the electrode and the separator included in the electrode stack, while mitigating the impact applied to the step difference portion between the electrode and the separator located on the long side of the electrode stack. FIG. 1 is a drawing showing a unit cell manufacturing apparatus according to one embodiment of the present invention. Figure 2 is a drawing showing a pair of roller parts of Figure 1. Figure 3 is a drawing showing a state in which a pair of electrode stacks are inserted between a pair of roller parts of Figure 2. FIG. 4 is a drawing showing a unit cell manufacturing apparatus according to another embodiment of the present invention. Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are used for identical or similar components throughout the specification. Furthermore, throughout the specification, when a part is described as “comprising” a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. FIG. 1 is a drawing showing a unit cell manufacturing apparatus according to an embodiment of the present invention. FIG. 2 is a drawing showing a pair of roller parts of FIG.