Stacked battery

Patent metadata

Field	Value
Publication number	US-2018316066-A1
Application number	US-201815952493-A
Country	US
Kind code	A1
Filing date	Apr 13, 2018
Priority date	Apr 28, 2017
Publication date	Nov 1, 2018
Grant date	—

Abstract

A main object of the present disclosure is to provide a stacked battery in which the unevenness of short circuit resistance among a plurality of cells is suppressed. The present disclosure achieves the object by providing a stacked battery comprising: a plurality of cells in a thickness direction, wherein the plurality of cells are electrically connected in parallel; each of the plurality of cells includes a cathode current collector, a cathode active material layer, a solid electrolyte layer, an anode active material layer, and an anode current collector, in this order; the stacked battery includes a surface-side cell that is located on a surface side of the stacked battery, and a center-side cell that is located on a center side rather than the surface-side cell; and the surface-side cell and the center-side cell satisfy at least one of: condition i) an elongation rate of the cathode current collector in the surface-side cell is less than an elongation rate of the cathode current collector in the center-side cell; and condition ii) an elongation rate of the anode current collector in the surface-side cell is less than an elongation rate of the anode current collector in the center-side cell.

First claim

What is claimed is:

1 . A stacked battery comprising:
a plurality of cells in a thickness direction, wherein the plurality of cells are electrically connected in parallel; each of the plurality of cells includes a cathode current collector, a cathode active material layer, a solid electrolyte layer, an anode active material layer, and an anode current collector, in this order; the stacked battery includes a surface-side cell that is located on a surface side of the stacked battery, and a center-side cell that is located on a center side rather than the surface-side cell; and the surface-side cell and the center-side cell satisfy at least one of: condition i) an elongation rate of the cathode current collector in the surface-side cell is less than an elongation rate of the cathode current collector in the center-side cell; and condition ii) an elongation rate of the anode current collector in the surface-side cell is less than an elongation rate of the anode current collector in the center-side cell.

2 . The stacked battery according to claim 1 , wherein, when each of the plurality of cells is numbered as a 1 st cell to a N th cell, in which N≥3, in order along the thickness direction of the stacked battery,
the surface-side cell is a cell that belongs to a cell region A including the 1 st cell to a (N/3) th cell.

3 . The stacked battery according to claim 2 , wherein the center-side cell is a cell that belongs to a cell region B including a ((N/3)+1) th cell to a (2N/3) th cell.

4 . The stacked battery according to claim 3 , wherein an average elongation rate of the cathode current collector in the cell region A is less than an average elongation rate of the cathode current collector in the cell region B.

5 . The stacked battery according to claim 3 , wherein an average elongation rate of the anode current collector in the cell region A is less than an average elongation rate of the anode current collector in the cell region B.

6 . The stacked battery according to claim 1 , wherein, when each of the plurality of cells is numbered as a 1 st cell to a N th cell, in which N≥60, in order along the thickness direction of the stacked battery,
the surface-side cell is a cell that belongs to a cell region C including the 1 st cell to a 20 th cell.

7 . The stacked battery according to claim 6 , wherein the center-side cell is a cell that belongs to a cell region D including a 21 st cell to a 40 th cell.

8 . The stacked battery according to claim 7 , wherein an average elongation rate of the cathode current collector in the cell region C is less than an average elongation rate of the cathode current collector in the cell region D.

9 . The stacked battery according to claim 7 , wherein an average elongation rate of the anode current collector in the cell region C is less than an average elongation rate of the anode current collector in the cell region D.

10 . The stacked battery according to claim 1 , wherein the anode active material layer includes Si or a Si alloy as an anode active material.

Assignees

• Toyota Motor Co Ltd

Inventors

• Hasegawa Hajime
• Matsushita Yuki
• Nishimura Hideaki
• Okuhata Yusuke
• Ose Norihiro
• Tateishi Mitsuru
• Nagamatsu Shigetaka
• Uchiyama Takayuki
• Hama Shigenori
• Kato Dai
• Mashimo Naohiro
• Ebisuzaki Hideyo
• Kobayashi Ayano
• Fujimaki Hisataka

Classifications

• H01M10/0525

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

• H01M4/64

  Carriers or collectors · CPC title

• H01M10/0585 Primary

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

• H01M10/0472

  Vertically superposed cells with vertically disposed plates · CPC title

• H01M10/4207 Primary

  for several batteries or cells simultaneously or sequentially · CPC title