Apparatus and method for manufacturing electrode of secondary battery

Patent metadata

Field	Value
Publication number	US-2025242376-A1
Application number	US-202418781785-A
Country	US
Kind code	A1
Filing date	Jul 23, 2024
Priority date	Jan 31, 2024
Publication date	Jul 31, 2025
Grant date	—

Abstract

An apparatus for manufacturing an electrode of a secondary battery, includes: a storage unit to store a slurry; a die coater connected to the storage unit, and to discharge the slurry onto a substrate; a supply unit connected to the storage unit and the die coater, and to supply the slurry from the storage unit to the die coater; a slurry measuring unit to measure a density and a flow rate of the slurry supplied from the supply unit; and a controller to control the supply unit based on the density and the flow rate of the slurry transmitted from the slurry measuring unit.

First claim

What is claimed is:

1 . An apparatus for manufacturing an electrode of a secondary battery, the apparatus comprising:
a storage unit to store a slurry; a die coater connected to the storage unit, and configured to discharge the slurry onto a substrate; a supply unit connected to the storage unit and the die coater, and configured to supply the slurry from the storage unit to the die coater; a slurry measuring unit configured to measure a density and a flow rate of the slurry supplied from the supply unit; and a controller configured to control the supply unit based on the density and the flow rate of the slurry transmitted from the slurry measuring unit.

2 . The apparatus as claimed in claim 1 , wherein the supply unit comprises a pump and a pulsation dampener,
wherein the controller is configured to calculate a target flow rate based on a solid weight ratio of the slurry and the density of the slurry transmitted from the slurry measuring unit, and wherein the controller is configured to control the pump based on the target flow rate.

3 . The apparatus as claimed in claim 1 , wherein the supply unit comprises a supply control valve connected to the die coater, and
wherein the controller is configured to control an opening and a closing of the supply control valve.

4 . The apparatus as claimed in claim 1 , wherein the supply unit comprises a supply control valve connected to the die coater, and a circulation control valve connected to the supply control valve and the storage unit.

5 . The apparatus as claimed in claim 4 , wherein the controller is configured to control the circulation control valve to adjust an amount of the slurry returning to the storage unit.

6 . The apparatus as claimed in claim 1 , further comprising a drying apparatus configured to dry the slurry discharged onto the substrate.

7 . The apparatus as claimed in claim 1 , further comprising a coating quality meter configured to measure a thickness and a density of the slurry discharged onto the substrate.

8 . The apparatus as claimed in claim 7 , wherein the controller is configured to control the supply unit based on the thickness and the density of the slurry measured by the coating quality meter.

9 . The apparatus as claimed in claim 1 , wherein the slurry measuring unit comprises a flow meter and a density meter,
wherein the flow meter comprises at least one of a Coriolis flowmeter, an ultrasonic flowmeter, or an electromagnetic flowmeter, and wherein the density meter comprises at least one of a vibrational density meter or a capacitive density meter.

10 . A method for manufacturing an electrode of a secondary battery, the method comprising:
measuring a density of a slurry to be supplied to a die coater; obtaining a solid weight ratio of the slurry; calculating a target flow rate based on the density of the slurry and the solid weight ratio of the slurry; and controlling a supply of the slurry based on the target flow rate.

11 . The method as claimed in claim 10 , wherein the calculating of the target flow rate comprises:
calculating the target flow rate based on Q=(LL*W*V)/(SC*p), where Q is the target flow rate, LL is a target application amount, W is a coating width of the slurry, V is a coating speed of the slurry, SC is the solid weight ratio of the slurry, and p is the density of the slurry.

12 . The method as claimed in claim 10 , wherein the obtaining of the solid weight ratio of the slurry comprises:
collecting the slurry; drying the collected slurry; and measuring the solid weight ratio of the slurry.

13 . The method as claimed in claim 10 , wherein the obtaining of the solid weight ratio of the slurry comprises:
acquiring a mixing ratio of the slurry; and estimating the solid weight ratio of the slurry in a database based on the mixing ratio of the slurry.

14 . The method as claimed in claim 10 , further comprising:
measuring a flow rate of the slurry; and discharging the slurry onto a substrate in response to the flow rate of the slurry corresponding to the target flow rate.

15 . The method as claimed in claim 14 , further comprising drying the slurry discharged onto the substrate.

16 . The method as claimed in claim 10 , further comprising:
measuring a flow rate of the slurry; and controlling a rate of the supply when the flow rate of the slurry does not correspond to the target flow rate.

17 . A method for manufacturing an electrode of a secondary battery, the method comprising:
setting a coating width, a coating speed, and a target application amount of a coating apparatus; measuring a density of a slurry to be supplied to a die coater from a supply unit; obtaining a solid weight ratio of the slurry; calculating a target flow rate of the slurry; controlling the supply unit based on the target flow rate; measuring a flow rate of the slurry; and determining whether to discharge the slurry onto a substrate based on the flow rate of the slurry and the target flow rate.

18 . The method as claimed in claim 17 , wherein the calculating of the target flow rate of the slurry comprises calculating the target flow rate of the slurry based on the coating width, the coating speed, the target application amount, the density of the slurry, and the solid weight ratio of the slurry.

19 . The method as claimed in claim 17 , wherein the obtaining of the solid weight ratio of the slurry comprises:
collecting the slurry; drying the collected slurry; and measuring solid contents of the slurry.

20 . The method as claimed in claim 17 , wherein the obtaining of the solid weight ratio of the slurry comprises:
acquiring a mixing ratio of the slurry; and estimating solid contents of the slurry in a database based on the mixing ratio of the slurry.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Sohn Myungbeom
• Son Taeyoung
• Chung Jeahyun

Classifications

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/13 Primary

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/0404 Primary

  Machines for assembling batteries · CPC title