Power storage device

Patent metadata

Field	Value
Publication number	US-2018025852-A1
Application number	US-201715722354-A
Country	US
Kind code	A1
Filing date	Oct 2, 2017
Priority date	Apr 14, 2015
Publication date	Jan 25, 2018
Grant date	—

Abstract

An electrical double layer capacitor having an electrolyte-containing layer between a first polarizable electrode layer and a second polarizable electrode layer. An insulating adhesive portion adheres to a first current collector and a second current collector and extends around the first and second polarizable electrode layers and the electrolyte-containing layer. A thickness of the insulating adhesive portion is larger than a sum of thicknesses of the first and second polarizable electrode layers and the electrolyte-containing layer.

First claim

1 . A power storage device comprising:
a device body having first and second principal surfaces extending along a length direction and a width direction, first and second side surfaces extending along the length direction and a thickness direction, and first and second end surfaces extending along the width direction and the thickness direction, the device body comprising: a first internal electrode which has a first current collector and a first polarizable electrode layer on at least one surface of the first current collector and the first current collector extends to the first end surface, a second internal electrode which has a second current collector and a second polarizable electrode layer on at least one surface of the second current collector and the second current collector extends to the second end surface, an electrolyte-containing layer between the first polarizable electrode layer and the second polarizable electrode layer, and an insulating adhesive portion adhered to the first current collector and the second current collector and extending around the first and second polarizable electrode layers and the electrolyte-containing layer, wherein a thickness of the insulating adhesive portion is larger than a sum of thicknesses of the first and second polarizable electrode layers and the electrolyte-containing layer.

2 . The power storage device according to claim 1 , wherein the device body has
a functional portion comprising the first and second internal electrodes and the electrolyte-containing layer, and an outer layer portion surrounding the functional portion and forming the first and second principal surfaces and the first and second side surfaces of the device body, wherein at least one central portion of the functional portion is depressed and forms a depressed portion between the functional portion and the outer layer portion.

3 . The power storage device according to claim 2 , wherein the first principal surface of the device body is flatter than a principal surface of the functional portion.

4 . The power storage device according to claim 3 , further comprising a reinforcing member disposed in the depressed portion between the functional portion and the outer layer portion.

5 . The power storage device according to claim 4 , wherein the reinforcing member comprises a thermosetting resin, an epoxy resin, or a phenol resin.

6 . The power storage device according to claim 2 , wherein a thickness of the functional portion at one of the first and second end surfaces is smaller than a thickness of the functional portion where the insulating adhesive portion is located.

7 . The power storage device according to claim 6 , wherein the thicknesses of the functional portion at the one of the first and second end surfaces is 0.8 to 0.9 times the thickness of the functional portion where the insulating adhesive portion is located.

8 . The power storage device according to claim 1 , wherein the device body has
a functional portion comprising the first and second internal electrodes and the electrolyte-containing layer, and an outer layer portion surrounding the functional portion and forming the first and second principal surfaces and the first and second side surfaces of the device body, wherein opposed central portions of the functional portion are depressed and form depressed portions between the functional portion and the outer layer portion.

9 . The power storage device according to claim 8 , wherein the first principal surface of the device body is flatter than a principal surface of the functional portion.

10 . The power storage device according to claim 9 , further comprising a reinforcing member disposed in the depressed portion between the functional portion and the outer layer portion.

11 . The power storage device according to claim 10 , wherein the reinforcing member comprises a thermosetting resin, an epoxy resin, or a phenol resin.

12 . The power storage device according to claim 8 , wherein a thickness of the functional portion at one of the first and second end surfaces is smaller than a thickness of the functional portion where the insulating adhesive portion is located.

13 . The power storage device according to claim 12 , wherein the thicknesses of the functional portion at the one of the first and second end surfaces is 0.8 to 0.9 times the thickness of the functional portion where the insulating adhesive portion is located.

14 . The power storage device according to claim 1 , wherein the thickness of the insulating adhesive portion is 1.1 to 1.3 times the thicknesses of the first and second polarizable electrode layers and the electrolyte-containing layer.

15 . The power storage device according to claim 1 , further comprising:
a first external electrode on the first end surface and electrically connected to the first internal electrode; and a second external electrode on the second end surface and electrically connected to the second internal electrode.

Assignees

• Murata Manufacturing Co

Inventors

• Aoki Norihisa
• Fukuda Yasutake
• Kunimatsu Hiroshi
• Ueda Yasuhiko
• Kimura Kenji

Classifications

• H01M2/263

  Electricity · mapped topic

• H01G11/26 Primary

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

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01G11/76

  specially adapted for integration in multiple or stacked hybrid or EDL capacitors · CPC title

• H01G11/12

  Stacked hybrid or EDL capacitors · CPC title