CN-122003777-A - Cell manufacturing method and cell manufacturing system

Abstract

The present disclosure relates to a method of manufacturing a battery cell including an exterior material in which an electrode assembly is accommodated, and a lead tab electrically connecting the electrode assembly to the outside and including a stopper protruding to one side, the method including a pre-cutting step of cutting a first region located at one end of a cutting lead tab connected to the electrode assembly and protruding to the outside of the exterior material, and a main cutting step of cutting a second region provided on the cutting lead tab at a predetermined distance from the stopper to form the lead tab.

Inventors

• Jin Caixun
• Wu Runxing
• Jin Xuxuan

Assignees

• SK新能源株式会社

Dates

Publication Date

20260508

Application Date

20241011

Priority Date

20231013

Claims (20)

1. 1. A method of manufacturing a battery cell including an exterior material accommodating an electrode assembly therein, and a lead tab electrically connecting the electrode assembly to an outside and including a stopper formed to protrude to one side, the method including: A precutting step of cutting a first region located at one end of a dicing lead sheet connected to the electrode assembly and protruding to the outside of the exterior material, and And a main cutting step of cutting a second region provided on the cutting lead piece at a predetermined distance from the stopper to form the lead piece.
2. 2. The cell manufacturing method according to claim 1, further comprising: And a bending step of pressing a bending region of the dicing lead sheet in one direction to form a stopper having a curved surface.
3. 3. The cell manufacturing method according to claim 1, further comprising: And a measurement step of measuring the shape of the lead sheet.
4. 4. The cell manufacturing method according to claim 1, further comprising: and a conveying step, wherein the battery cell is arranged on the upper surface of the conveying component so as to convey the battery cell.
5. 5. The method for manufacturing a battery cell according to claim 2, wherein, The pre-cutting step comprises the following steps: a first alignment step of moving the battery cell so that the battery cell is positioned in a preset alignment area, and And a first cutting step of cutting the first region.
6. 6. The method for manufacturing a battery cell according to claim 5, wherein, In the first alignment step of the present invention, And pressurizing one side surface of the battery cell, on which the lead sheet for cutting is arranged, so that the battery cell faces the vertical alignment part positioned on one side of the alignment area, and pressurizing the other side surface of the battery cell vertical to the one side surface so that the battery cell faces the horizontal alignment part positioned on the other side of the alignment area and vertical to the vertical alignment part.
7. 7. The method for manufacturing a battery cell according to claim 5, wherein, The bending step is performed between the first alignment step and the first cutting step.
8. 8. The method for manufacturing a battery cell according to claim 2, wherein, In the course of the bending step of the bending device, The bending region is pressed on one side surface and the other side surface by a supporting portion including a protruding portion where one region protrudes and a pressing portion including a recessed portion formed in a shape corresponding to the protruding portion, respectively.
9. 9. The method for manufacturing a battery cell according to claim 2, wherein, The bending region is formed in a direction perpendicular to a direction in which the lead tab protrudes.
10. 10. The method for manufacturing a battery cell according to claim 8, wherein, In the pre-cutting step, The first cutting member cuts the first region when the support portion and the pressing portion press the bending region.
11. 11. The method for manufacturing a battery cell according to claim 5, wherein, In the first cutting step of the present invention, A plurality of notch portions are formed at one end of the dicing lead piece.
12. 12. The method for manufacturing a battery cell according to claim 11, wherein, The notch portion is formed along one edge of the dicing die, one region of the one edge, and one region of the other edge perpendicular to the one edge.
13. 13. The method for manufacturing a battery cell according to claim 11, wherein, The main cutting step includes: A second alignment step of moving the battery cell so that the battery cell is positioned in a preset fixed area, and And a second cutting step of cutting the second region.
14. 14. The method for manufacturing a battery cell according to claim 13, wherein, In the second alignment step of the present invention, And pressurizing one side surface of the battery cell, on which the cutting lead sheet is arranged, so that the battery cell faces the vertical fixing part positioned on one side of the fixing area, and pressurizing the other side surface of the battery cell perpendicular to the one side surface so that the battery cell faces the horizontal fixing part positioned on the other side of the fixing area and perpendicular to the vertical fixing part.
15. 15. The method for manufacturing a battery cell according to claim 14, wherein, The bending step is performed between the second alignment step and the second cutting step.
16. 16. The method for manufacturing a battery cell according to claim 14, wherein, In the second cutting step of the present invention, And cutting from one area of one cut portion to one area of the other cut portion in a direction perpendicular to the direction in which the lead tab protrudes.
17. 17. The method for manufacturing a battery cell according to claim 4, wherein, The conveying part repeatedly operates and stops at preset intervals.
18. 18. A cell manufacturing system, comprising: The battery cell comprises an outer packaging material, an electrode assembly and a lead sheet, wherein the electrode assembly is internally accommodated in the outer packaging material; a precut section for cutting a first region located in a cutting lead sheet connected to the electrode assembly to electrically connect the electrode assembly to the outside; a bending portion for pressing a bending region of the cutting lead sheet in one direction to form a U-shaped stopper portion, and And a main cutting part cutting a second region of the lead sheet spaced apart from the stopper by a predetermined distance.
19. 19. The cell manufacturing system of claim 18, further comprising: and a measuring unit for measuring the shape of the lead piece.
20. 20. The cell manufacturing system of claim 18, further comprising: and a conveying part for conveying the battery cell.

Description

Cell manufacturing method and cell manufacturing system Technical Field The present disclosure relates to a cell manufacturing method and a cell manufacturing system. And more particularly, to a method and system for manufacturing a cell for forming a stopper on a lead tab. Background A secondary battery is a battery that can convert electric energy into chemical energy and store it, and is reused many times by charging and discharging. Secondary batteries are widely used in various industries due to their economical and environmental characteristics. In particular, the lithium secondary battery (Lithium Secondary Battery) among the secondary batteries is widely used in various industries including portable devices requiring high-density energy. In order to manufacture a secondary battery having high output and high capacity characteristics, a plurality of secondary batteries are also used in combination. For example, the secondary battery may be divided into a battery cell, a battery module, and a battery pack according to an assembly unit. The combined battery cells may constitute a battery module, and the combined battery module may constitute a battery pack. The battery module may electrically connect the plurality of battery cells with the outside through the bus bar assembly. At this time, errors and defects may occur due to assembly tolerances or stacking tolerances during the insertion of the plurality of battery cells into the bus bar assembly. Therefore, the quality of the manufactured battery module may be reduced or the production efficiency may be reduced. Disclosure of Invention First, the technical problem to be solved The technical problem to be solved by the present disclosure is to provide a method and a system for manufacturing a battery cell, which can reduce errors when a bus bar assembly is inserted by forming a stopper on a lead tab of the battery cell. In addition, the present disclosure is directed to providing a cell manufacturing method and a manufacturing system that can improve the assembly stability of a cell and a bus bar assembly by constantly setting a distance from a stopper to one end. In addition, the present disclosure is directed to a cell manufacturing method and system that improves energy density and performance by reducing stack tolerances and assembly errors of the cells. In addition, the present disclosure can be widely applied to green technical fields such as electric vehicles, battery charging stations, and other solar power generation and wind power generation using batteries. In addition, the present disclosure may be used for an environment-friendly (eco-friendly) electric automobile (ELECTRIC VEHICLE), a hybrid vehicle (hybrid), and the like, which prevent climate change by suppressing atmospheric pollution and greenhouse gas emission. (II) technical scheme The present disclosure relates to a method of manufacturing a battery cell including an exterior material in which an electrode assembly is accommodated, and a lead tab electrically connecting the electrode assembly to the outside and including a stopper protruding to one side, the method including a pre-cutting step of cutting a first region located at one end of a cutting lead tab connected to the electrode assembly and protruding to the outside of the exterior material, and a main cutting step of cutting a second region provided on the cutting lead tab at a predetermined distance from the stopper to form the lead tab. The method for manufacturing a battery cell may further include a bending step of pressurizing a bending region located at the cutting lead sheet in one direction to form a stopper having a curved surface. The method of manufacturing a battery cell may further include a measuring step of measuring a shape of the lead tab. The cell manufacturing method may further include a conveying step of disposing the cells on an upper surface of the conveying member to convey the cells. The pre-cutting step may include a first alignment step of moving the battery cells so that the battery cells are located in a preset alignment area, and a first cutting step of cutting the first area. In the first alignment step, one side surface of the battery cell on which the cutting lead piece is provided may be pressurized so that the battery cell faces a vertical alignment portion located at one side of the alignment region, and the other side surface of the battery cell perpendicular to the one side surface may be pressurized so that the battery cell faces a horizontal alignment portion located at the other side of the alignment region and perpendicular to the vertical alignment portion. The bending step may be performed between the first alignment step and the first cutting step. In the bending step, one side surface and the other side surface of the bending region may be pressurized by a supporting portion including a protruding portion where one region protrudes and a pressurizing portion including a recess