Stacked battery

Patent metadata

Field	Value
Publication number	US-11075409-B2
Application number	US-201815952493-A
Country	US
Kind code	B2
Filing date	Apr 13, 2018
Priority date	Apr 28, 2017
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

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 comprising an inorganic solid electrolyte material as a solid electrolyte material, 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;
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; and
when each of the plurality of cells is numbered as a 1 st cell to a N th cell, in which N≥10, in order along the thickness direction of the stacked battery, the surface-side cell is not the 1 4 cell or the N th cell; and
in the condition i) a material for the cathode current collector in the surface-side cell is a material with lower elongation rate than that of a material for the cathode current collector in the center-side cell; and
in condition ii) a material for the anode current collector in the surface-side cell is a material with lower elongation rate than that of a material for the anode current collector in the center-side cell.

2. The stacked battery according to claim 1 , wherein,
the surface-side cell is a cell that belongs to a cell region A including a 2 nd 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 a 2 nd 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

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · 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

• H01M2300/0068

  inorganic · CPC title

• H01M2004/027

  Negative electrodes · CPC title