Method of manufacturing electrode for secondary battery and hot-gas drying furnace

Patent metadata

Field	Value
Publication number	US-10276857-B2
Application number	US-201214430572-A
Country	US
Kind code	B2
Filing date	Sep 25, 2012
Priority date	Sep 25, 2012
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

Provided are a method of manufacturing an electrode for a secondary battery which can properly maintain the temperature of a hot gas while requiring a smaller amount of hot gas, and a hot-gas drying furnace used for the method. A control device calculates an amount of decrease in temperature of a hot gas at a blowing position of a nozzle (first position) based on a temperature of the hot gas at second position situated downstream of the first position and a temperature of the hot gas at third position situated downstream of the second position. The control device adds the amount to a set temperature of the hot gas at the first position to calculate a modified set temperature. The control device adjusts an output of a heater depending on a difference between the modified set temperature and the temperature at the first position.

First claim

The invention claimed is:

1. A method of manufacturing an electrode for a secondary battery using a hot-gas drying furnace, the hot-gas drying furnace including:
a conveying roller for conveying a collector sheet to which a paste for the electrode is applied;
a nozzle for blowing a hot gas which is a heated gas onto the paste;
a gas supply fan and a gas supply duct for supplying the hot gas to the nozzle;
a heater for heating the gas to be supplied to the nozzle, which is disposed in the gas supply duct;
a control device for adjusting an output of the heater;
first, second and third temperature sensors, wherein
the second temperature sensor is disposed upstream of the nozzle with respect to a conveyance direction of the collector sheet and above the collector sheet,
the third temperature sensor is disposed upstream of the nozzle with respect to the conveyance direction of the collector sheet and below the collector sheet, the method comprising:
conveying the collector sheet in the conveyance direction;
applying the paste for the electrode onto the collector sheet;
blowing the hot gas in a flow direction onto the paste, wherein the flow direction is toward an upstream side with respect to the conveyance direction of the collector sheet;
a step of measuring, using the first temperature sensor, a temperature of the hot gas at a first position which is a blowing position of the nozzle;
a step of measuring, using the second temperature sensor, a temperature of the hot gas at a second position which is within a flow area of the hot gas blown through the nozzle, the second position being situated downstream of the first position in the flow direction of the hot gas blown through the nozzle, and disposed at a position above the collector sheet;
a step of measuring, using the third temperature sensor, a temperature of the hot gas at a third position which is within the flow area of the hot gas blown through the nozzle, the third position being situated downstream of the second position in the flow direction of the hot gas blown through the nozzle, and disposed at a position below the collector sheet;
a step of calculating, using the control device, an amount of decrease in temperature of the hot gas at the first position caused by evaporative latent heat of the paste based on the temperature of the hot gas measured by the second temperature sensor and the temperature of the hot gas measured by the third temperature sensor;
a step of adding, using the control device, the calculated amount to a set temperature of the hot gas at the first position to modify the set temperature of the hot gas at the first position;
and
a step of adjusting, using the control device, the output of the heater depending on a difference between the modified set temperature of the hot gas and the temperature of the hot gas measured by the first temperature sensor.

2. The method according to claim 1 , wherein
the control device has map information on a correlation acquired in advance between the amount of decrease in temperature of the hot gas at the first position caused by the evaporative latent heat of the paste, and the temperature of the hot gas at the second position and the temperature of the hot gas at the third position, and
the control device calculates, using the map information, the amount of decrease in temperature of the hot gas at the first position based on the temperature of the hot gas at the second position measured by the second temperature sensor and the temperature of the hot gas at the third position measured by the third temperature sensor.

3. The method according to claim 1 , wherein
The first second and third temperature sensors measure a temperature of the hot gas blown through the nozzle, wherein the hot gas has a shortest flow passage length from the heater.

Assignees

• Tsuchiya Kenji
• Toyota Motor Co Ltd

Inventors

• Tsuchiya Kenji

Classifications

• F26B21/50

  Ducting arrangements from the source of air or other gases to the materials or objects being dried · CPC title

• F26B21/35

  Temperature; Pressure · CPC title

• F26B21/10

  Mechanical Engineering · mapped topic

• H01M4/0404

  by coating on electrode collectors · CPC title

• F26B13/108

  using one or more blowing devices, e.g. nozzle bar, the effective area of which is adjustable to the width of the material · CPC title