Stacked battery

Patent metadata

Field	Value
Publication number	US-2018316065-A1
Application number	US-201815952450-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 sneak current caused by an unevenness of a 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 with a cathode current collecting tab, a cathode active material layer, a solid electrolyte layer, an anode active material layer, and an anode current collector with an anode current collecting tab, 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) a resistance of the cathode current collecting tab in the surface-side cell is more than a resistance of the cathode current collecting tab in the center-side cell; and condition ii) a resistance of the anode current collecting tab in the surface-side cell is more than a resistance of the anode current collecting tab 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 with a cathode current collecting tab, a cathode active material layer, a solid electrolyte layer, an anode active material layer, and an anode current collector with an anode current collecting tab, 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) a resistance of the cathode current collecting tab in the surface-side cell is more than a resistance of the cathode current collecting tab in the center-side cell; and condition ii) a resistance of the anode current collecting tab in the surface-side cell is more than a resistance of the anode current collecting tab in the center-side cell.

2 . The stacked battery according to claim 1 , wherein a specific resistance of the cathode current collecting tab in the surface-side cell is more than a specific resistance of the cathode current collecting tab in the center-side cell.

3 . The stacked battery according to claim 1 , wherein a specific resistance of the anode current collecting tab in the surface-side cell is more than a specific resistance of the anode current collecting tab in the center-side cell.

4 . The stacked battery according to claim 1 , wherein a thickness of the cathode current collecting tab in the surface-side cell is less than a thickness of the cathode current collecting tab in the center-side cell.

5 . The stacked battery according to claim 1 , wherein a thickness of the anode current collecting tab in the surface-side cell is less than a thickness of the anode current collecting tab in the center-side cell.

6 . The stacked battery according to claim 1 , wherein an area of the cathode current collecting tab in the surface-side cell is less than an area of the cathode current collecting tab in the center-side cell.

7 . The stacked battery according to claim 1 , wherein an area of the anode current collecting tab in the surface-side cell is less than an area of the anode current collecting tab in the center-side cell.

8 . The stacked battery according to claim 1 , wherein the cathode current collecting tab in the surface-side cell includes a resistor on at least one surface side.

9 . The stacked battery according to claim 1 , wherein the anode current collecting tab in the surface-side cell includes a resistor on at least one surface side.

10 . The stacked battery according to claim 1 , wherein an area of a welded portion in contact with the cathode current collecting tab in the surface-side cell is less than an area of a welded portion in contact with the cathode current collecting tab in the center-side cell.

11 . The stacked battery according claim 1 , wherein an area of a welded portion in contact with the anode current collecting tab in the surface-side cell is less than an area of a welded portion in contact with the anode current collecting tab in the center-side cell.

12 . The stacked battery according to claim 1 , wherein, when each of the plurality of cells is numbered as 1 st cell to 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 1 st cell to (N/3) th cell.

13 . The stacked battery according to claim 12 , wherein the center-side cell is a cell that belongs to a cell region B including ((N/3)+1) th cell to (2N/3) th cell.

14 . The stacked battery according to claim 13 , wherein an average resistance of the cathode current collecting tab in the cell region A is more than an average resistance of the cathode current collecting tab in the cell region B.

15 . The stacked battery according to claim 13 , wherein an average resistance of the anode current collecting tab in the cell region A is more than an average resistance of the anode current collecting tab in the cell region B.

16 . The stacked battery according to claim 1 , wherein, when each of the plurality of cells is numbered as 1 st cell to 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 1 st cell to 20 th cell.

17 . The stacked battery according to claim 16 , wherein the center-side cell is a cell that belongs to a cell region D including 21 st cell to 40 th cell.

18 . The stacked battery according to claim 17 , wherein an average resistance of the cathode current collecting tab in the cell region C is more than an average resistance of the cathode current collecting tab in the cell region D.

19 . The stacked battery according to claim 17 , wherein an average resistance of the anode current collecting tab in the cell region C is more than an average resistance of the anode current collecting tab in the cell region D.

20 . 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

• H01M10/425 Primary

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title

• H01M2200/00

  Safety devices for primary or secondary batteries · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/4207

  for several batteries or cells simultaneously or sequentially · CPC title