Electrode structure, secondary battery, battery pack and vehicle

Patent metadata

Field	Value
Publication number	US-2018083310-A1
Application number	US-201715443651-A
Country	US
Kind code	A1
Filing date	Feb 27, 2017
Priority date	Sep 21, 2016
Publication date	Mar 22, 2018
Grant date	—

Abstract

According to one embodiment, an electrode structure is provided. The electrode structure includes a current collector, a separator layer, and an active material layer including a main surface and a first end face other than the main surface. The active material layer covers a first part of at least one surface of the current collector. The separator layer covers the main surface of the active material layer, at least a part of the first end face and second part of the at least one surface of the current collector.

First claim

What is claimed is:

1 . An electrode structure comprising:
a current collector; an active material layer comprising a main surface and a first end face other than the main surface; and a separator layer, wherein the active material layer covers a first part of at least one surface of the current collector, the separator layer covers the main surface of the active material layer, at least a part of the first end face and a second part of the at least one surface of the current collector, and the separator layer comprises a first end part which is brought into contact with the second part of the at least one surface of the current collector, and wherein the electrode structure satisfies a ratio b/a falling within a range of 0.0001 to 0.5, where a is a distance from the first end face of the active material layer to the first end part of the separator layer, and b is a distance in a direction parallel to the at least one surface of the current collector, which is from a first edge of the active material layer to a surface of the separator layer, the main surface of the active material layer and the first end face of the active material layer intersect at the first edge of the active material layer.

2 . The electrode structure according to claim 1 , wherein the ratio b/a falls within a range of 0.001 to 0.1.

3 . The electrode structure according to claim 1 , wherein the separator layer covers a whole surface of the first end face of the active material layer.

4 . The electrode structure according to claim 1 , wherein the active material layer comprises a second end face opposed to the first end face,
the separator layer further covers at least a part of the second end face and a third part of the at least one surface of the current collector, and wherein the electrode structure satisfies a ratio d/c falling within a range of 0.6 to 1, where c is a distance in a direction parallel to the at least one surface of the current collector, which is from a second edge of the active material layer to the surface of the separator layer, the at least one surface of the current collector and the second end face of the active material layer intersect at the second edge of the active material layer, and d is a distance in a direction parallel to the at least one surface of the current collector, which is from a third edge to the surface of the separator layer, the main surface of the active material layer and the second end face of the active material layer intersect at the third edge of the active material layer.

5 . The electrode structure according to claim 4 , wherein the ratio d/c falls within a range of 0.7 to 0.9.

6 . The electrode structure according to claim 4 , wherein the separator layer covers a whole second end face of the active material layer.

7 . A secondary battery comprising:
a positive electrode; a negative electrode comprising the electrode structure according to claim 1 ; and an electrolyte.

8 . A battery pack comprising the secondary battery according to claim 7 .

9 . The battery pack according to claim 8 , further comprising an external power distribution terminal and a protective circuit.

10 . The battery pack according to claim 8 , comprising a plural of the secondary batteries, wherein the secondary batteries are electrically connected in series, in parallel, or in combination of in series and in parallel.

11 . A vehicle comprising the battery pack according to claim 8 .

12 . The vehicle according to claim 11 , wherein the battery pack is configured to recover a regenerative energy of a power of the vehicle.

Assignees

• Toshiba Kk

Inventors

• Iwasaki Takuya
• Sugizaki Tomoko
• Harada Yasuhiro
• Takami Norio

Classifications

• H01M2300/0071

  Oxides · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• H01M10/0525 Primary

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

• H01M10/4207

  for several batteries or cells simultaneously or sequentially · CPC title

• H01M10/0563

  Liquid materials, e.g. for Li-SOCl2 cells · CPC title