Method for manufacturing battery

Patent metadata

Field	Value
Publication number	US-2018219249-A1
Application number	US-201815862919-A
Country	US
Kind code	A1
Filing date	Jan 5, 2018
Priority date	Jan 27, 2017
Publication date	Aug 2, 2018
Grant date	—

Abstract

The present invention provides a method for manufacturing a battery which includes a granulation step (Step S 1 ) of mixing at least an active material, a binder, and a solvent to form wet granulated particles, a deposition step (Step S 2 ) of subjecting the wet granulated particles to a forming process to form an active material layer on a current collector, a rolling step (Step S 3 ) of placing a separator on a surface of the active material layer and rolling the separator before the wet granulated particles on the current collector are dried, to obtain a laminated body in which the current collector, the active material layer, and the separator are stacked in this order and closely attached to each other, a drying step (Step S 4 ) of drying the laminated body to provide an integrated laminated body, and a fabrication step (Step S 5 ) of fabricating a battery using the integrated laminated body.

First claim

What is claimed is:

1 . A method for manufacturing a battery, comprising the steps of:
mixing at least an active material, a binder, and a solvent to form a plurality of wet granulated particles; subjecting the plurality of wet granulated particles to a forming process to form an active material layer on a current collector; placing a separator on a surface of the active material layer and rolling the separator before the wet granulated particles on the current collector are dried, to obtain a laminated body in which the current collector, the active material layer, and the separator are stacked in this order and closely attached to each other; drying the laminated body to provide an integrated laminated body; and fabricating a battery using the integrated laminated body.

2 . The method for manufacturing a battery according to claim 1 , wherein
the binder includes a rubber, and when a total solid content of the wet granulated particles is 100 mass %, a content of the rubber based on the total solid content of the wet granulated particles is set to 0.5 mass % or more.

3 . The method for manufacturing a battery according to claim 1 , wherein
the binder includes a rubber, and when a total solid content of the wet granulated particles is 100 mass %, a content of the rubber based on the total solid content of the wet granulated particles is set to 1.0 mass % or less.

4 . The method for manufacturing a battery according to claim 2 , wherein the binder further includes a cellulose-based polymer.

5 . The method for manufacturing a battery according to claim 1 , wherein, in the granulation step, a solid content ratio of the wet granulated particles is set to 65 mass % or more and 95 mass % or less.

6 . The method for manufacturing a battery according to claim 1 , wherein, in the rolling step, the separator is placed on the surface of the active material layer in a state where 50 mass % or more of a total amount of the solvent with which the wet granulated particles are impregnated in the granulation step remains.

7 . The method for manufacturing a battery according to claim 1 , wherein the rolling step is performed at a temperature of 25±10° C.

8 . The method for manufacturing a battery according to claim 1 , wherein the rolling step is performed at a temperature of 40° C. or more and 150° C. or less.

Assignees

• Toyota Motor Co Ltd

Inventors

• Sugihara Atsushi

Classifications

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/0435

  Rolling or calendering · CPC title

• H01M4/622

  being polymers · CPC title

• H01M10/0418 Primary

  with bipolar electrodes · CPC title

• H01M4/04 Primary

  Processes of manufacture in general · CPC title