Energy storage device

Patent metadata

Field	Value
Publication number	US-2016276702-A1
Application number	US-201615068915-A
Country	US
Kind code	A1
Filing date	Mar 14, 2016
Priority date	Mar 17, 2015
Publication date	Sep 22, 2016
Grant date	—

Abstract

An energy storage device includes: an electrode assembly which includes: an approximately rectangular positive electrode; an approximately rectangular negative electrode which is stacked alternately with the positive electrode; and a strip-like elongated separator having a base material layer and an inorganic layer which is made to overlap with the first base material layer, wherein the elongated separator is arranged between the positive electrode and the negative electrode, and the base material layer of the elongated separator faces the negative electrode in an opposed manner between the positive electrode and the negative electrode.

First claim

What is claimed is:

1 . An energy storage device, comprising:
an electrode assembly which includes: at least one approximately rectangular positive electrode; at least one approximately rectangular negative electrode which is stacked alternately with the positive electrode; and a strip-like elongated separator having a first base material layer and a first inorganic layer which is made to overlap with the first base material layer, wherein the elongated separator is arranged between the positive electrode and the negative electrode, and the first base material layer of the elongated separator is configured to face the negative electrode in an opposed manner between the positive electrode and the negative electrode.

2 . The energy storage device according to claim 1 , wherein the first base material layer of the elongated separator is configured to face the negative electrode arranged on an end portion of the electrode assembly in a stacking direction of the positive electrode and the negative electrode from the outside in the stacking direction.

3 . The energy storage device according to claim 1 , wherein
the electrode assembly includes short separators having an approximately rectangular shape, the positive electrodes and the negative electrodes form a plurality of electrode groups in each of which the positive electrode and the negative electrode are alternately arranged with the short separator interposed therebetween, the plurality of electrode groups are arranged in a row in the stacking direction of the positive electrodes and the negative electrodes, the electrode groups which are arranged adjacently to each other are configured such that the positive electrode of one electrode group and the negative electrode of the other electrode group face each other in an opposed manner, the elongated separator is arranged between the electrode groups arranged adjacently to each other, and the first base material layer of the elongated separator is configured to face the negative electrode positioned at an end portion of the electrode group between the electrode groups.

4 . The energy storage device according to claim 3 , wherein the short separator includes a second base material layer and a second inorganic layer which is made to overlap with the second base material layer, and
between the positive electrode and the negative electrode of each electrode group, the second base material layer of the short separator is configured to face the negative electrode in an opposed manner.

5 . The energy storage device according to claim 1 , wherein
the positive electrodes and the negative electrodes form a plurality of electrode portions which respectively include at least either one of the positive electrode and the negative electrode, the plurality of electrode portions are arranged in a row in a stacking direction of the positive electrodes and the negative electrodes, the electrode portions which are arranged adjacently to each other are configured such that the positive electrode of one electrode portion and the negative electrode of the other electrode portion face each other in an opposed manner, the plurality of electrode portions include a first electrode portion arranged at a center portion in the stacking direction, and second electrode portion which are remaining electrode portions, both ends of the first electrode portion in the stacking direction are formed of the same electrode, both ends of the second electrode portion in the stacking direction are formed of different electrodes, the elongated separator is arranged in a spiral shape such that the elongated separator surrounds the first electrode portion and passes between the respective electrode portions as viewed in a direction orthogonal to the stacking direction, and between the electrode portions, the first base material layer of the elongated separator is configured to face the negative electrode positioned at an end of the electrode portion in the stacking direction in an opposed manner.

6 . The energy storage device according to claim 1 , wherein
the positive electrodes and the negative electrodes form a plurality of electrode portions which respectively include at least either one of the positive electrode and the negative electrode, the plurality of electrode portions are arranged in a row in a stacking direction of the positive electrodes and the negative electrodes, the electrode portions which are arranged adjacently to each other are configured such that the positive electrode of one electrode portion and the negative electrode of the other electrode portion face each other in an opposed manner, both ends of each electrode portion in the stacking direction are formed of the same electrode, the elongated separator is arranged in a zigzag shape such that the elongated separator passes between the respective electrode portions as viewed in a direction orthogonal to the stacking direction, and between the electrode portions, the first base material layer of the elongated separator is configured to face the negative electrode positioned at an end of the electrode portion in the stacking direction in an opposed manner.

7 . The energy storage device according to claim 1 , wherein
the elongated separator is arranged between the positive electrode and the negative electrode arranged adjacently to each other, and the first base material layer is configured to face the negative electrode in an opposed manner between the positive electrode and the negative electrode arranged adjacently to each other respectively.

Assignees

• Gs Yuasa Int Ltd

Inventors

• Nakai Kenta
• Kako Tomonori
• Miyazaki Akihiko
• Mori Sumio

Classifications

• H01G11/06

  with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] · CPC title

• H01M10/0459 Primary

  Cells or batteries with folded separator between plate-like electrodes · CPC title

• H01G11/26

  characterised by their structure, e.g. multi-layered, porosity or surface features · CPC title

• H01M10/0583

  of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators · CPC title

• H01G11/82

  Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations · CPC title