Layered cell and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2018026308-A1
Application number	US-201715650220-A
Country	US
Kind code	A1
Filing date	Jul 14, 2017
Priority date	Jul 25, 2016
Publication date	Jan 25, 2018
Grant date	—

Abstract

A layered cell has a plurality of unit cells each having a positive electrode having a positive electrode current collector layer, a negative electrode having a negative electrode current collector layer, and a solid electrolyte layer disposed between the positive electrode and the negative electrode. The unit cells are stacked, the positive electrode current collector layer has a positive electrode current collector tab protruding from the positive electrode current collector layer in a surface direction, the negative electrode current collector layer has a negative electrode current collector tab protruding from the negative electrode current collector layer in the surface direction, and at least one of the positive electrode current collector tabs and the negative electrode current collector tabs are electrically connected and integrated with intervention of a conductive member disposed in a gap between the neighboring current collector tabs of the unit cell.

First claim

What is claimed is:

1 . A layered cell comprising:
a plurality of unit cells each having a positive electrode having a positive electrode current collector layer, a negative electrode having a negative electrode current collector layer, and a solid electrolyte layer disposed between the positive electrode and the negative electrode, wherein the unit cells are stacked, the positive electrode current collector layer has a positive electrode current collector tab protruding from the positive electrode current collector layer in a surface direction of the positive electrode current collector layer, the negative electrode current collector layer has a negative electrode current collector tab protruding from the negative electrode current collector layer in a surface direction of the negative electrode current collector layer, and a current collector tab that is at least one of the positive electrode current collector tab and the negative electrode current collector tab is electrically connected and integrated with a corresponding current collector tab of a neighboring unit cell with intervention of a conductive member disposed in a gap between the current collector tab and the corresponding current collector tab of the neighboring unit cell.

2 . The layered cell according to claim 1 , wherein a width of the conductive member in a direction perpendicular to a direction in which the current collector tab protrudes and a direction in which the unit cells are stacked is larger than a width of the current collector tab in the direction perpendicular to the direction in which the current collector tab protrudes and the direction in which the unit cells are stacked.

3 . The layered cell according to claim 2 , further comprising:
a lead joined to a portion of the conductive member protruding from the current collector tab.

4 . The layered cell according to claim 1 , wherein each of both the positive electrode current collector tab and the negative electrode current collector tab is the current collector tab.

5 . The layered cell according to claim 1 , wherein a length of the conductive member in a direction in which the current collector tab protrudes is smaller than a length of the current collector tab in the direction in which the current collector tab protrudes.

6 . The layered cell according to claim 1 , further comprising:
an insulating member disposed on a surface of the current collector tab and disposed between the conductive member and the unit cell.

7 . A method of manufacturing the layered cell according to claim 1 , the method comprising:
preparing the positive electrode, the negative electrode and the solid electrolyte layer; joining the conductive member to one surface of the current collector tab that is at least one of the positive electrode current collector tab and the negative electrode current collector tab; stacking the positive electrode, the solid electrolyte layer and the negative electrode, and obtaining a cell laminated body formed by stacking the plurality of unit cells each having the positive electrode, the negative electrode, and the solid electrolyte layer disposed between the positive electrode and the negative electrode; and joining the conductive member and the current collector tab adjacent to the conductive member and electrically connecting and integrating the current collector tab with the corresponding current collector tab of the neighboring unit cell with intervention of the conductive member.

8 . A method of manufacturing the layered cell according to claim 1 , the method comprising:
preparing the positive electrode, the negative electrode and the solid electrolyte layer; joining the conductive members to both surfaces of the current collector tab that is at least one of the positive electrode current collector tab and the negative electrode current collector tab; stacking the positive electrode, the solid electrolyte layer and the negative electrode and obtaining a cell laminated body formed by stacking the plurality of unit cells each having the positive electrode, the negative electrode, and the solid electrolyte layer disposed between the positive electrode and the negative electrode; and joining the neighboring conductive members and electrically connecting and integrating the current collector tab with the corresponding current collector tab of the neighboring unit cell with intervention of the conductive member.

9 . The method of manufacturing the layered cell according to claim 7 , wherein joining of the current collector tab and the conductive member is performed by ultrasonic joining.

10 . A method of manufacturing the layered cell according to claim 1 , the method comprising:
preparing the positive electrode, the negative electrode and the solid electrolyte layer; stacking the positive electrode, the solid electrolyte layer and the negative electrode and obtaining a cell laminated body formed by stacking the plurality of unit cells each having the positive electrode, the negative electrode, and the solid electrolyte layer disposed between the positive electrode and the negative electrode; disposing the conductive member in the gap between the current collector tab that is at least one of the positive electrode current collector tab and the negative electrode current collector tab and the corresponding current collector tab of the neighboring unit cell; and electrically connecting and integrating the current collector tab with the corresponding current collector tab of the neighboring unit cell with intervention of the conductive member.

Assignees

• Toyota Motor Co Ltd

Inventors

• Yamada Keigo
• Nishino Hiroaki

Classifications

• H01M50/536

  characterised by the method of fixing the leads to the electrodes, e.g. by welding · CPC title

• H01M4/02

  Electrodes composed of, or comprising, active material · CPC title

• H01M2/266

  Electricity · mapped topic

• H01M2/263

  Electricity · mapped topic

• H01M10/0468

  Compression means for stacks of electrodes and separators · CPC title