EP-4738527-A1 - METHOD FOR MANUFACTURING SECONDARY BATTERY

EP4738527A1EP 4738527 A1EP4738527 A1EP 4738527A1EP-4738527-A1

Abstract

Disclosed herein relates to a secondary battery manufacturing method. The method includes: discharging a plurality of battery cells; and evaluating the plurality of battery cells based on the voltage and current of the plurality of battery cells measured during discharge of the plurality of battery cells, wherein evaluating the plurality of battery cells includes calculating electrical parameters of the plurality of battery cells and standardizing the electrical parameters of the plurality of battery cells to calculate standardized electrical parameters of the plurality of battery cells.

Inventors

LEE, SEOK HA
BAE, JOON SUNG
KIM, Ryun Hwan
CHA, JAE MIN

Assignees

LG Energy Solution, Ltd.

Dates

Publication Date: 20260506
Application Date: 20250512

Claims (20)

A secondary battery manufacturing method comprising: discharging a plurality of battery cells; and evaluating the plurality of battery cells based on the voltage and current of the plurality of battery cells measured during discharge of the plurality of battery cells, wherein evaluating the plurality of battery cells includes calculating electrical parameters of the plurality of battery cells and standardizing the electrical parameters of the plurality of battery cells to calculate standardized electrical parameters of the plurality of battery cells.
The secondary battery manufacturing method of claim 1, wherein the electrical parameters include voltage.
The secondary battery manufacturing method of claim 1, wherein the electrical parameters include differential voltage.
The secondary battery manufacturing method of claim 1, wherein the electrical parameters include differential capacity.
The secondary battery manufacturing method of claim 1, wherein the electrical parameters of the plurality of battery cells are standardized based on the average and standard deviation of the electrical parameters of the plurality of battery cells.
The secondary battery manufacturing method of claim 1, wherein the plurality of battery cells is simultaneously transferred by a battery tray.
The secondary battery manufacturing method of claim 1, wherein evaluating the plurality of battery cells is based on the standardized electrical parameters of the plurality of battery cells and an outlier detection model.
The secondary battery manufacturing method of claim 7, wherein the outlier detection model is trained based on the electrical parameters of a plurality of normal battery cells.
The secondary battery manufacturing method of claim 7, wherein the outlier detection model is trained based on the electrical parameters of first normal battery cells among the plurality of normal battery cells, and the distance between the electrical parameters of the first normal battery cells and the average of the electrical parameters of the normal battery cells is three times the standard deviation or less.
The secondary battery manufacturing method of claim 1, wherein discharging the plurality of battery cells is characterized by not fully discharging the plurality of battery cells.
The secondary battery manufacturing method of claim 1, wherein the plurality of battery cells is discharged to a predetermined voltage.
The secondary battery manufacturing method of claim 11, wherein the predetermined voltage is higher than the discharge cutoff voltage.
The secondary battery manufacturing method of claim 1, wherein evaluating the plurality of battery cells is performed during or after the discharge of the plurality of battery cells.
A secondary battery manufacturing method comprising: charging a plurality of battery cells; and evaluating the plurality of battery cells based on the voltage and current of the plurality of battery cells measured while charging the plurality of battery cells, wherein evaluating the plurality of battery cells includes calculating electrical parameters of the plurality of battery cells and standardizing the electrical parameters of the plurality of battery cells to calculate standardized electrical parameters of the plurality of battery cells.
The secondary battery manufacturing method of claim 14, wherein the electrical parameters include voltage.
The secondary battery manufacturing method of claim 14, wherein the electrical parameters include differential voltage.
The secondary battery manufacturing method of claim 14, wherein the electrical parameters include differential capacity.
The secondary battery manufacturing method of claim 14, wherein the electrical parameters of the plurality of battery cells are standardized based on the average and standard deviation of the electrical parameters of the plurality of battery cells.
The secondary battery manufacturing method of claim 14, wherein the plurality of battery cells is simultaneously transferred by a battery tray.
The secondary battery manufacturing method of claim 14, wherein evaluating the plurality of battery cells is based on the standardized electrical parameters of the plurality of battery cells and an outlier detection model.

Description

[Technical Field] The present disclosure relates to a secondary battery manufacturing method. This application claims the benefit of Korean Patent Application No. 10-2024-0063470, filed on May 14, 2024 and Korean Patent Application No. 10-2025-0052890, filed on April 23, 2025, the disclosure of which is incorporated herein by reference. [Background] Unlike primary batteries, secondary batteries can be charged and discharged a plurality of times. Secondary batteries are widely used as energy sources for various wireless devices such as handsets, laptops, and cordless vacuum cleaners. Recently, due to improvements in energy density and economies of scale, the manufacturing cost per unit capacity of secondary batteries has decreased dramatically. As the range of battery electric vehicles (BEVs) has increased to levels comparable to fuel vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility. Secondary batteries are manufactured through electrode processes, assembly processes, and activation processes. In the electrode process, an electrode assembly including a positive electrode, a negative electrode, and a separator may be provided. In the assembly process, the electrode assembly and electrolyte may be enclosed within a case. In the activation process, the assembled battery cell may undergo charging, discharging, and aging stages. Through the activation process, the battery cell can be activated and stabilized by electrical energy. \ [Summary] [Technical Problem] The technical problem addressed by the present disclosure is to provide a secondary battery manufacturing method with improved throughput. [Technical Solution] According to exemplary embodiments of the present disclosure for solving the aforementioned problems, a secondary battery manufacturing method is provided. The method includes: discharging a plurality of battery cells; and evaluating the plurality of battery cells based on the voltage and current of the plurality of battery cells measured during discharge of the plurality of battery cells, wherein evaluating the plurality of battery cells includes calculating electrical parameters of the plurality of battery cells and standardizing the electrical parameters of the plurality of battery cells to calculate standardized electrical parameters of the plurality of battery cells. The electrical parameters include voltage. The electrical parameters include differential voltage. The electrical parameters include differential capacity. The electrical parameters of the plurality of battery cells are standardized based on the average and standard deviation of the electrical parameters of the plurality of battery cells. The plurality of battery cells is simultaneously transferred by a battery tray. Evaluating the plurality of battery cells is based on the standardized electrical parameters of the plurality of battery cells and an outlier detection model. The outlier detection model is trained based on the electrical parameters of a plurality of normal battery cells. The outlier detection model is trained based on the electrical parameters of first normal battery cells among the plurality of normal battery cells, and the distance between the electrical parameters of the first normal battery cells and the average of the electrical parameters of the normal battery cells is three times the standard deviation or less. Discharging the plurality of battery cells is characterized by not fully discharging the plurality of battery cells. The plurality of battery cells is discharged to a predetermined voltage. The predetermined voltage may be higher than the discharge cutoff voltage. Evaluating the plurality of battery cells may be performed during discharging of the plurality of battery cells or after discharging has ended. According to exemplary embodiments, a secondary battery manufacturing method is provided. The method includes: charging a plurality of battery cells; and evaluating the plurality of battery cells based on the voltage and current of the plurality of battery cells measured while charging the plurality of battery cells, wherein evaluating the plurality of battery cells includes calculating electrical parameters of the plurality of battery cells and standardizing the electrical parameters of the plurality of battery cells to calculate standardized electrical parameters of the plurality of battery cells. The electrical parameters include voltage. The electrical parameters include differential voltage. The electrical parameters include differential capacity. The electrical parameters of the plurality of battery cells are standardized based on the average and standard deviation of the electrical parameters of the plurality of battery cells. The plurality of battery cells is simultaneously transferred by a battery tray. Evaluating the plurality of battery cells is based on the standardized electrical parameters of the plurality of battery cells and an outlier detectio