EP-4738496-A1 - METHOD FOR MANUFACTURING SECONDARY BATTERY

EP4738496A1EP 4738496 A1EP4738496 A1EP 4738496A1EP-4738496-A1

Abstract

Example embodiments of the present technology provide a secondary battery manufacturing method. The secondary battery manufacturing method includes inspecting an electrode sheet to collect coordinate-related inspection data, which includes an evaluation value indicating a defect of the electrode sheet and coordinates matching the evaluation value, cutting the electrode sheet into first and second separate electrode sheets, winding the first and second separate electrode sheets into first and second separate electrode rolls, and determining outputs of the first and second separate electrode sheets.

Inventors

LIM, SUNG MOOK
KIM, MIN SU
CHOI, Ee Beom

Assignees

LG Energy Solution, Ltd.

Dates

Publication Date: 20260506
Application Date: 20240903

Claims (12)

A secondary battery manufacturing method comprising: inspecting an electrode sheet to collect coordinate-related inspection data, the coordinate-related inspection data including an evaluation value indicating a defect of the electrode sheet and coordinates matching the evaluation value; cutting the electrode sheet into first and second separate electrode sheets; winding the first and second separate electrode sheets into first and second separate electrode rolls; and determining outputs of the first and second separate electrode sheets.
The secondary battery manufacturing method of claim 1, wherein the outputs of the first and second separate electrode sheets are respectively determined based on first and second winding amounts that are lengths of the first and second separate electrode sheets wound into the first and second separate electrode rolls.
The secondary battery manufacturing method of claim 1, further comprising calculating amounts of exclusion of the first and second separate electrode sheets, wherein lengths of defective parts of the first and second separate electrode sheets are respectively added to the amounts of exclusion of the first and second separated electrode sheets.
The secondary battery manufacturing method of claim 3, wherein the length of the defective part of the electrode sheet is calculated based on the coordinate-related inspection data.
The secondary battery manufacturing method of claim 3, wherein lengths of parts of the first and second separate electrode sheets that are removed for sample inspection are added to the amounts of exclusion.
The secondary battery manufacturing method of claim 5, further comprising calculating amounts of good-quality products that are lengths of normal parts of the first and second separate electrode sheets, based on the outputs and the amounts of exclusion.
The secondary battery manufacturing method of claim 6, wherein the amounts of good-quality products are calculated by subtracting the amounts of exclusion from the outputs.
A secondary battery manufacturing method comprising: collecting coordinate-related inspection data of an electrode sheet; cutting the electrode sheet into first and second separate electrode sheets; and calculating amounts of good-quality products that are lengths of normal parts of the first and second separate electrode sheets, based on outputs, amounts of defects, and losses of the first and second separate electrode sheets, wherein the amounts of defects are lengths of defective parts of the first and second separate electrode sheets and the losses are amounts of lost parts of the first and second separate electrode sheets, wherein the coordinate-related inspection data includes an evaluation value indicating a defect of the electrode sheet and coordinates matching the evaluation value, and the amounts of defects are determined based on the coordinate-related inspection data.
The secondary battery manufacturing method of claim 8, wherein the losses are determined based on manual input data that is input by an operator.
The secondary battery manufacturing method of claim 8, wherein lengths of parts of the first and second separate electrode sheets that are lost due to sample inspection and removal of residual quantity are added to the losses.
The secondary battery manufacturing method of claim 8, wherein the outputs of the first and second separate electrode sheets are respectively determined based on first and second winding amounts that are lengths of the first and second separate electrode sheets wound into first and second separate electrode rolls.
The secondary battery manufacturing method of claim 8, wherein the amounts of good-quality products are calculated by subtracting the amounts of defects and the losses from the outputs.

Description

[Technical Field] The present invention relates to a secondary battery manufacturing method. The present application claims the benefit of priority based on Korean Patent Application No. 10-2023-0119056, filed on September 7, 2023, and the entire contents of the Korean patent application is incorporated herein by reference [Background Art] Secondary batteries can be charged and discharged a plurality of times unlike primary batteries. Secondary batteries have been widely used as energy sources for various types of wireless devices such as handsets, laptop computers, and cordless vacuum cleaners. Recently, a main use of secondary batteries is moving from mobile devices to mobility, as manufacturing costs per unit capacity of secondary batteries drastically decrease due to improved energy density and economies of scale and a range of battery electric vehicles (BEVs) increases to the same level as fuel vehicles. A secondary battery is manufactured by an electrode process, an assembly process, and an activation process. Among these processes, the electrode process is a key process in determining the yield and performance of a battery cell. The electrode process may include a coating process, a roll press process, and a slitting process. In the coating process, an active material and an insulation material may be applied to a surface of a current collector. In the roll press process, an electrode may be pressed by pressing rolls. In the roll press process, a density, performance and surface quality of the electrode may be determined. In the slitting process, the electrode may be cut into a plurality of electrodes according to the design of battery cells. [Disclosure] [Technical Problem] The present invention is directed to providing a secondary battery manufacturing method using a roll map including information about quality and defects in an electrode manufacturing process. [Technical Solution] Example embodiments of the present invention provide a secondary battery manufacturing method. The secondary battery manufacturing method includes inspecting an electrode sheet to collect coordinate-related inspection data, which includes an evaluation value indicating a defect of the electrode sheet and coordinates matching the evaluation value, cutting the electrode sheet into first and second separate electrode sheets, winding the first and second separate electrode sheets into first and second separate electrode rolls, and determining outputs of the first and second separate electrode sheets. The outputs of the first and second separate electrode sheets may be respectively determined based on first and second winding amounts that are lengths of the first and second separate electrode sheets wound into the first and second separate electrode rolls. The secondary battery manufacturing method may further include calculating amounts of exclusion of the first and second separate electrode sheets, and lengths of defective parts of the first and second separate electrode sheets may be respectively added to the amounts of exclusion of the first and second separated electrode sheets. The length of the defective part of the electrode sheet may be calculated based on the coordinate-related inspection data. Lengths of parts of the first and second separate electrode sheets that are removed for sample inspection may be added to the amounts of exclusion. The secondary battery manufacturing method may further include calculating amounts of good-quality products that are lengths of normal parts of the first and second separate electrode sheets, based on the outputs and the amounts of exclusion. The amounts of good-quality products may be calculated by subtracting the amounts of exclusion from the outputs. Example embodiments provide a secondary battery manufacturing method. The secondary battery manufacturing method includes collecting coordinate-related inspection data of an electrode sheet, cutting the electrode sheet into first and second separate electrode sheets, and calculating amounts of good-quality products that are lengths of normal parts of the first and second separate electrode sheets, based on outputs, amounts of defects, and losses of the first and second separate electrode sheets, in which the amounts of defects are lengths of defective parts of the first and second separate electrode sheets, the losses are amounts of lost parts of the first and second separate electrode sheets, the coordinate-related inspection data includes an evaluation value indicating a defect of the electrode sheet and coordinates matching the evaluation value, and the amounts of defects are determined based on the coordinate-related inspection data. The losses may be determined based on manual input data that is input by an operator. Lengths of parts of the first and second separate electrode sheets that are lost due to sample inspection and removal of residual quantity may be added to the losses. The outputs of the first and second separate e