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

Patent metadata

Field	Value
Publication number	US-2016172117-A1
Application number	US-201615049143-A
Country	US
Kind code	A1
Filing date	Feb 22, 2016
Priority date	Sep 9, 2013
Publication date	Jun 16, 2016
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, 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.

4 . The electrical storage device according to claim 1 ,
wherein the separator substrate is made of one of paper and nonwoven fabric that include nonconductive fiber, and the conductive polymer adheres to the nonconductive fiber.

5 . The electrical storage device according to claim 4 ,
wherein the second surface layer includes the nonconductive fiber at a higher density than the first surface layer.

6 . The electrical storage device according to claim 4 ,
wherein the first surface layer includes the nonconductive fiber at a higher density than the second surface layer.

7 . 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.

8 . The electrical storage device according to claim 1 ,
wherein an amount of the conductive polymer adhering to the first surface of the separator substrate is smaller than an amount of the conductive polymer adhering to the second surface, the amount referring to an amount per unit area of the separator substrate.

9 . The electrical storage device according to claim 1 ,
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.

10 . The electrical storage device according to claim 9 ,
wherein 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.

11 . The electrical storage device according to claim 9 ,
wherein the first region in the first surface layer is disposed at a position facing an edge of the anode foil along a winding direction.

12 . The electrical storage device according to claim 9 ,
wherein 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.

13 . The electrical storage device according to claim 1 ,
wherein the anode body includes a dielectric film on a surface thereof, and the electrical storage element is a capacitor element formed by stacking the anode body, the separator, and the cathode body.

14 . The electrical storage device according to claim 13 ,
wherein the first region in the first surface layer is disposed at a position facing an edge of the anode body.

15 . A manufacturing method of an electrical storage device comprising:
forming a separator having an anode facing surface and a cathode facing surface by making a conductive polymer adhere to a separator substrate having a first surface and a second surface; producing an electrical storage element by confronting an anode with the anode facing surface of the separator and confronting a cathode with the cathode facing surface of the separator; and impregnating the electrical storage element with an electrolytic solution, wherein, in forming the separator, a liquid agent that is a solution or a dispersion liquid of the conductive polymer is applied to at least one of the first surface and the second surface of the separator substrate so as to infiltrate into the separator substrate, and then a solvent or a dispersion medium included in the liquid agent is volatized.

16 . The manufacturing method of the electrical storage device according to claim 15 ,
wherein in forming the separator, a non-application portion to which the liquid agent is not applied is disposed on the first surface, and an application portion to which the liquid agent is applied is disposed on the second surface.

17 . The manufacturing method of the electrical storage device according to claim 16 ,
wherein the non-application portion is formed by applying the liquid agent to the first surface by printing.

18 . The manufacturing method of the electrical storage device according to claim 16 ,
wherein an area of an application region of the liquid agent on the first surface is set smaller than an area of the application region of the liquid agent on the second surface.

19 . The manufacturing method of the electrical storage device according to claim 16 ,
wherein an amount of the liquid agent applied to the first surface is set larger than an amount of the liquid agent applied to the second surface.

20 . The manufacturing method of the electrical storage device according to claim 19 ,
wherein an amount of the liquid agent infiltrating into the separator substrate through the first surface is set larger than an amount of the liquid agent infiltrating into the separator substrate through the second surface.

21 . The manufacturing method of the electrical storage device according to claim 16 ,
wherein the non-application portion is formed by applying the liquid agent to only the second surface.

22 . The manufacturing method of the electrical storage device according to claim 15 ,
wherein in forming the electrical storage element, one of paper and nonwoven fabric that include nonconductive fiber is used as the separator substrate, a metal foil having a dielectric film is used as the anode,

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

• H01G9/151 Primary

  with wound foil electrodes · CPC title

• H01G9/0029

  Processes of manufacture · CPC title

• H01G9/048

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

• H01G9/02

  Diaphragms; Separators · CPC title