Electrode sheet drying apparatus

Patent metadata

Field	Value
Publication number	US-12013181-B2
Application number	US-202318461576-A
Country	US
Kind code	B2
Filing date	Sep 6, 2023
Priority date	Jun 3, 2020
Publication date	Jun 18, 2024
Grant date	Jun 18, 2024

Abstract

An electrode sheet drying apparatus includes a plurality of hot air blowers each having a nozzle. The nozzle has a first hot air guide having a first guide surface, a second hot air guide having a second guide surface. The nozzle is configured to blow band hot air toward an obliquely upstream side. An angle formed between the first guide surface and an undried active material layer is set to an angle at which the band hot air travels toward an upstream side along the undried active material layer over a distance longer than or equal to 15 times as large as a gap from a first upstream-side edge to the undried active material layer even without a spread prevention part.

First claim

What is claimed is:

1. An electrode sheet drying apparatus that heats and dries an undried active material layer provided on a band current collector foil in an undried electrode sheet while conveying the undried electrode sheet in a longitudinal direction of the undried electrode sheet, the electrode sheet drying apparatus comprising:
a plurality of hot air blowers each located in a first thickness direction with respect to the undried electrode sheet, the first thickness direction being directed from the current collector foil toward the undried active material layer in a thickness direction of the undried electrode sheet, the plurality of hot air blowers being arranged in a conveying direction of the undried electrode sheet at a predetermined pitch, wherein:
each of the hot air blowers includes a nozzle configured to blow band hot air in a second thickness direction opposite from the first thickness direction in the thickness direction and toward an obliquely upstream side that is an upstream side in the conveying direction, the band hot air spreading in a width direction of the undried electrode sheet;
the nozzle includes
a first hot air guide having a first guide surface that advances in the first thickness direction toward a downstream side in the conveying direction, and
a second hot air guide located in the second thickness direction with respect to the first guide surface and having a second guide surface facing and parallel to the first guide surface;

the nozzle is configured to blow the band hot air toward the obliquely upstream side from between a first upstream-side edge that is an edge at the upstream side of the first guide surface and a second upstream-side edge that is an edge at the upstream side of the second guide surface through between the first guide surface and the second guide surface;
an angle formed between the first guide surface or the second guide surface and the undried active material layer falls within a range from 5° to 45°;
a gap from the first upstream-side edge to the undried active material layer falls within a range from 3 mm to 10 mm; and
an initial flow velocity of the band hot air blown from the nozzle falls within a range from 40 m/s to 80 m/s.

Assignees

• Toyota Motor Co Ltd

Inventors

• Nakano Takahiko

Classifications

• F26B21/50

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

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• F26B15/18

  the objects or batches of materials being carried by endless belts · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0525

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