Stacked battery

Patent metadata

Field	Value
Publication number	US-10910677-B2
Application number	US-201815952450-A
Country	US
Kind code	B2
Filing date	Apr 13, 2018
Priority date	Apr 28, 2017
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

An objective of the present disclosure is to provide a stacked battery that suppresses sneak current caused by an unevenness of a short circuit resistance among a plurality of cells. The present disclosure provides a stacked battery comprising: a plurality of cells in a thickness direction, wherein the plurality of cells are electrically connected in parallel; 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; wherein 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; or 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;
an area in plan view of the cathode current collecting tab in the surface-side cell is less than an area in plan view of the cathode current collecting tab in the center-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 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.

7. 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.

8. 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.

9. 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.

10. 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.

11. 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.

12. The stacked battery according to claim 11 , 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.

13. The stacked battery according to claim 12 , 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.

14. The stacked battery according to claim 12 , 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.

15. 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.

16. The stacked battery according to claim 15 , wherein the center-side cell is a cell that belongs to a cell region D including 21 st cell to 40 th cell.

17. The stacked battery according to claim 16 , 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.

18. The stacked battery according to claim 16 , 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.

19. 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

• H01M50/536

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

• H01M50/534

  characterised by the material of the leads or tabs · CPC title

• H01M50/533

  characterised by the shape of the leads or tabs · CPC title

• H01M50/54

  Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges · CPC title

• Y02P70/50

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