Electrical storage device, manufacturing method of the same, and separator

Patent metadata

Field	Value
Publication number	US-2018108490-A1
Application number	US-201715841072-A
Country	US
Kind code	A1
Filing date	Dec 13, 2017
Priority date	Sep 9, 2013
Publication date	Apr 19, 2018
Grant date	—

Abstract

An electrical storage device includes an electrical storage element and an electrolytic solution. The electrical storage element is formed of an anode body, a cathode body facing the anode body, and a separator interposed between the anode body and the cathode body. The separator includes a separator substrate and a conductive polymer adhering to the separator substrate. The electrical storage element is impregnated with the electrolytic solution. The separator includes a first surface layer having a first surface facing the anode body and a second surface layer having a second surface facing the cathode body. The first surface layer includes a first region that is not provided with the conductive polymer, and the second surface layer includes a second region provided with the conductive polymer.

First claim

What is claimed is:

1 . An electrical storage device comprising:
an electrical storage element including:
an anode body;
a cathode body facing the anode body; and
a separator including a separator substrate and a conductive polymer adhering to the separator substrate, and interposed between the anode body and the cathode body; and
an electrolytic solution with which the electrical storage element is impregnated, wherein the separator includes a first surface layer having a first surface facing the anode body, and a second surface layer having a second surface facing the cathode body, the first surface layer includes a first region that is not provided with the conductive polymer, and the second surface layer includes a second region provided with the conductive polymer.

2 . The electrical storage device according to claim 1 ,
wherein the first surface layer includes a third region provided with the conductive polymer, and an area, of the third region in the first surface layer, facing the anode body is smaller than an area, of the second region in the second surface layer, facing the cathode body.

3 . The electrical storage device according to claim 1 ,
wherein the first surface layer includes a third region provided with the conductive polymer, the separator includes an intermediate layer between the first surface layer and the second surface layer, the intermediate layer includes a fourth region provided with the conductive polymer, and the conductive polymer adhering to the third region in the first surface layer electrically communicates with the conductive polymer adhering to the second region in the second surface layer via the conductive polymer adhering to the fourth region in the intermediate layer.

4 . The electrical storage device according to claim 2 ,
wherein the anode body is formed of an anode foil including a dielectric film thereon, and the cathode body is formed of a cathode foil, and the electrical storage element is a capacitor element including the anode foil and the cathode foil wound together via the separator the anode body includes an anode lead connected to the anode foil, and the first region in the first surface layer is disposed at a position facing a connection part between the anode foil and the anode lead.

5 . The electrical storage device according to claim 2 ,
wherein the anode body is formed of an anode foil including a dielectric film thereon, and the cathode body is formed of a cathode foil, and the electrical storage element is a capacitor element including the anode foil and the cathode foil wound together via the separator, and the first region in the first surface layer is disposed at a position facing an edge of the anode foil along a winding direction.

6 . The electrical storage device according to claim 2 ,
wherein the anode body is formed of an anode foil including a dielectric film thereon, and the cathode body is formed of a cathode foil, and the electrical storage element is a capacitor element including the anode foil and the cathode foil wound together via the separator, and the first region in the first surface layer is disposed at at least one of a position facing a winding-start edge of the anode foil and a position facing a winding-end edge of the anode foil.

7 . An electrical storage device comprising:
an electrical storage element including:
an anode body;
a cathode body facing the anode body; and
a separator including a separator substrate and a conductive polymer adhering to the separator substrate, and interposed between the anode body and the cathode body; and
an electrolytic solution with which the electrical storage element is impregnated, wherein the separator includes a first surface layer having a first surface facing the anode body, and a second surface layer having a second surface facing the cathode body, and an amount of the conductive polymer adhering to a first separator half-body is smaller than an amount of the conductive polymer adhering to a second separator half-body, where the first separator half-body is a portion from a center of the separator in a thickness direction to the first surface, the second separator half-body is a portion from the center of the separator in the thickness direction to the second surface.

8 . The electrical storage device according to claim 7 ,
wherein the separator substrate is made of one of paper and nonwoven fabric that include nonconductive fiber, the conductive polymer adheres to the nonconductive fiber, and the second surface layer includes the nonconductive fiber at a different density from the first surface layer.

9 . The electrical storage device according to claim 8 ,
wherein the second surface layer includes the nonconductive fiber at a higher density than the first surface layer.

10 . The electrical storage device according to claim 8 ,
wherein the first surface layer includes the nonconductive fiber at a higher density than the second surface layer.

11 . The electrical storage device according to claim 7 ,
wherein the first surface layer includes a third region provided with the conductive polymer, the second surface layer includes a second region provided with the conductive polymer, the separator includes an intermediate layer between the first surface layer and the second surface layer, the intermediate layer includes a fourth region provided with the conductive polymer, and the conductive polymer adhering to the third region in the first surface layer electrically communicates with the conductive polymer adhering to the second region in the second surface layer via the conductive polymer adhering to the fourth region in the intermediate layer.

12 . The electrical storage device according to claim 8 ,
wherein the first surface layer includes a third region provided with the conductive polymer, the second surface layer includes a second region provided with the conductive polymer, the separator includes an intermediate layer between the first surface layer and the second surface layer, the intermediate layer includes a fourth region provided with the conductive polymer, and the conductive polymer adhering to the third region in the first surface layer electrically communicates with the conductive polymer adhering to the second region in the second surface layer via the conductive polymer adhering to the fourth region in the intermediate layer.

13 . The electrical storage device according to claim 7 ,
wherein an adhering amount of the conductive polymer, which adheres to the first surface of the separator substrate, per unit area of the separator substrate is smaller than an adhering amount of the conductive polymer, which adheres to the first surface of the separator substrate, per unit area of the separator substrate.

14 . The electrical storage device according to claim 8 ,
wherein an adhering amount of the conductive polymer, which adheres to the first surface of the separator substrate, per unit area of the separator substrate is smaller than an adhering amount of the conductive polymer, which adheres to the first surface of the separator substrate, per unit area of the separator substrate.

15 . The electrical storage device according to claim 11 ,
wherein an adhering amount of the conductive polymer, which adheres to the first surface of the separator substrate, per unit area of the separator substrate is smaller than an adhering amount of the conductive polymer, which adheres to the first surface of the separator substrate, per unit area of the separator substrate.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Kubo Daisuke
• Takahashi Masayuki
• Shimasaki Yukihiro
• Tashiro Tomoyuki
• Aoyama Tatsuji

Classifications

• H01G9/035

  Liquid electrolytes, e.g. impregnating materials (H01G11/54 takes precedence) · CPC title

• H01G9/028

  Organic semiconducting electrolytes, e.g. TCNQ · CPC title

• H01G9/0029

  Processes of manufacture · CPC title

• H01G9/048

  characterised by their structure (H01G11/22 takes precedence) · CPC title

• H01G13/04

  Drying; Impregnating · CPC title