Energy storage device

Patent metadata

Field	Value
Publication number	US-2016285134-A1
Application number	US-201615078961-A
Country	US
Kind code	A1
Filing date	Mar 23, 2016
Priority date	Mar 27, 2015
Publication date	Sep 29, 2016
Grant date	—

Abstract

Provided is an energy storage device which includes: an electrode assembly including a positive electrode and a negative electrode respectively including a non-coated region having a metal foil; current collectors each having a support portion which is made to overlap with the non-coated region; and opposedly facing supports each configured to clamp the non-coated region cooperatively with the support portion, wherein at least one of the non-coated region, the support portion and the opposedly facing support includes a conductive layer having non-oxidizing property or hardly-oxidizable property, the conductive layer covering at least one surface out of a surface of the non-coated region facing the support portion, a surface of the non-coated region facing the opposedly facing support, a surface of the support portion facing the non-coated region, and a surface of the opposedly facing support facing the non-coated region.

First claim

What is claimed is:

1 . An energy storage device comprising:
an electrode assembly including a positive electrode and a negative electrode that are stacked, the positive electrode and the negative electrode respectively including a non-coated region having a metal foil; current collectors each having a support portion which is made to overlap with the non-coated region; and opposedly facing supports each configured to clamp the non-coated region cooperatively with the support portion, wherein at least one of the non-coated region, the support portion and the opposedly facing support includes a conductive layer having non-oxidizing property or hardly-oxidizable property, the conductive layer covering at least one surface out of a surface of the non-coated region facing the support portion, a surface of the non-coated region facing the opposedly facing support, a surface of the support portion facing the non-coated region, and a surface of the opposedly facing support facing the non-coated region.

2 . The energy storage device according to claim 1 , wherein
the support portion has a first fitting portion formed of either one of a projecting portion and a recessed portion, the opposedly facing support has a second fitting portion formed of the other of the projecting portion or the recessed portion, the second fitting portion being engaged with the first fitting portion by concavoconvex fitting engagement in a state where the non-coated region is clamped between the first fitting portion and the second fitting portion, and the conductive layer is disposed at a position corresponding to at least the first fitting portion and the second fitting portion.

3 . The energy storage device according to claim 2 , wherein
the projecting portion and the recessed portion which form the first fitting portion and the second fitting portion are portions formed by molding using a male mold and a female mold, the projecting portion is formed on either one of the support portion and the opposedly facing support, whichever has a larger thickness size, and the recessed portion is formed on either one of the support portion and the opposedly facing support, whichever has a smaller thickness size.

4 . The energy storage device according to claim 1 , wherein
the non-coated region of either one of the positive electrode and the negative electrode is stacked, and the conductive layer is formed on respective surfaces of the non-coated regions which face each other in an opposed manner in the stacked state.

5 . The energy storage device according to claim 1 , wherein the conductive layer contains a carbonaceous material.

6 . The energy storage device according to claim 1 , wherein
at least one of the positive electrode and the negative electrode has the non-coated region and a coated region formed adjacently to the non-coated region, the non-coated region has a first conductive layer which forms the conductive layer, the coated-region has: a second metal foil continuously formed with a first metal foil which is a metal foil of the non-coated region; a second conductive layer having non-oxidizing property or hardly-oxidizable property, the second conductive layer being stacked on the second metal foil in a close contact state; and an active material layer stacked on the second conductive layer such that the second conductive layer is sandwiched between the active material layer and the second metal foil, and the first conductive layer and the second conductive layer are continuously formed with each other.

7 . The energy storage device according to claim 1 , wherein
the conductive layer covers the whole of at least one surface out of the surface of the non-coated region facing the support portion, and the surface of the non-coated region facing the opposedly facing support.

8 . The energy storage device according to claim 1 , wherein
the positive electrode and the negative electrode respectively include: the metal foil; and an active material layer stacked on the metal foil in regions of the metal foil except for the non-coated region, and the conductive layer covers the whole surface of the metal foil facing the active material layer between the metal foil and the active material layer.

9 . The energy storage device according to claim 1 , wherein
the positive electrode and the negative electrode are wound in a stacked state in the electrode assembly, and the non-coated region is disposed at an end portion of the electrode assembly in a winding center axis direction.

Assignees

• Gs Yuasa Int Ltd

Inventors

• Sasaki Takeshi
• Kambayashi Hirokazu
• Maeda Kazuto

Classifications

• H01M50/50

  Current conducting connections for cells or batteries · CPC title

• H01M50/533

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

• H01M50/536

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

• H01M4/661 Primary

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M4/70

  characterised by shape or form · CPC title