Battery manufacturing method

Patent metadata

Field	Value
Publication number	US-11652241-B2
Application number	US-201916979898-A
Country	US
Kind code	B2
Filing date	Mar 26, 2019
Priority date	Apr 9, 2018
Publication date	May 16, 2023
Grant date	May 16, 2023

Abstract

A method for manufacturing a battery has a stacking step in which a plurality of unit cells are stacked, the unit cells being such that a positive electrode obtained by a positive electrode active material layer containing an electrolytic solution disposed on a positive electrode current collector, and a negative electrode obtained by a negative electrode active material layer containing an electrolytic solution disposed on a negative electrode current collector with a separator interposed therebetween. In the stacking step, each time one of the unit cells is stacked, the stack of the unit cells are pressed from the stacking direction.

First claim

The invention claimed is:

1. A battery manufacturing method comprising:
forming a plurality of unit cells each comprising a positive electrode including a positive electrode active material layer containing an electrolytic solution disposed on a positive electrode current collector, a negative electrode including a negative electrode active material layer containing an electrolytic solution disposed on a negative electrode current collector, and an electrolyte interposed between the positive electrode and the negative electrode; and
each time one of the unit cells is stacked, applying pressure to the stack of the unit cells from a stacking direction without being heated,
in forming the plurality of unit cells, the positive electrode active material layer and the negative electrode active material layer not being subjected to a drying process performed through heating.

2. The battery manufacturing method according to claim 1 , wherein
the applying of the pressure to the stack of the unit cells includes bring a pressing surface of a pressing part into surface contact with the unit cells from the stacking direction to carry out pressing.

3. The battery manufacturing method according to claim 1 , wherein
the pressure used in pressing the unit cells is 14.7-39.2 (Pa).

4. The battery manufacturing method according to claim 1 , wherein
a binder content in the positive and negative electrode active material layers of the positive and negative electrodes is 1 (mass %) or less relative to 100 (mass %) of a total solid content.

5. The battery manufacturing method according to claim 1 , wherein
the unit cells are stacked after the unit cells are obtained and outer peripheries of the unit cells are sealed.

6. A battery manufacturing method comprising:
forming a plurality of unit cells each comprising a positive electrode including a positive electrode active material layer containing an electrolytic solution disposed on a positive electrode current collector, a negative electrode including a negative electrode active material layer containing an electrolytic solution disposed on a negative electrode current collector, and an electrolyte interposed between the positive electrode and the negative electrode;
sealing outer peripheries of the unit cells;
stacking the unit cells into a stack after the outer peripheries of the unit cells have been sealed; and
each time one of the unit cells is stacked, applying pressure to the stack of the unit cells from a stacking direction,
in forming the plurality of unit cells, the positive electrode active material layer and the negative electrode active material layer not being subjected to a drying process performed through heating.

7. The battery manufacturing method according to claim 1 , wherein
each of the positive electrode active material layer and the negative electrode active material layer do not include a binder.

Assignees

• Nissan Motor

Inventors

• Kaburagi Tomohiro
• Satou Hajime
• Yoda Kazuyuki
• Watanabe Shigeo
• Mizuno Yusuke
• Emori Yusuke
• Sakurai Takuya

Classifications

• H01M10/0585 Primary

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M4/621 Primary

  Binders · CPC title

• H01M4/66

  Selection of materials · CPC title

• H01M50/202

  Casings or frames around the primary casing of a single cell or a single battery · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title