Electrochemical device and method of manufacturing electrochemical device

Patent metadata

Field	Value
Publication number	US-2017256821-A1
Application number	US-201715438599-A
Country	US
Kind code	A1
Filing date	Feb 21, 2017
Priority date	Mar 4, 2016
Publication date	Sep 7, 2017
Grant date	—

Abstract

An electrochemical device has a positive-electrode terminal, a negative-electrode terminal, a first electrode body, a second electrode body, and electrolytic solution. The positive-electrode terminal is flat plate-shaped, and has a first principal face and a second principal face on the opposite side. The negative-electrode terminal is flat plate-shaped, and has a third principal face and a fourth principal face on the opposite side. The first electrode body has a first wound positive-electrode non-forming region and a first wound negative-electrode non-forming region. The second electrode body has a second wound positive-electrode non-forming region and a second wound negative-electrode non-forming region. The first wound positive-electrode non-forming region, first wound negative-electrode non-forming region, second wound positive-electrode non-forming region, and second wound negative-electrode non-forming region are joined to the first principal face, third principal face, second principal face, and fourth principal face, respectively.

First claim

We/I claim:

1 . An electrochemical device, comprising:
a positive-electrode terminal which is flat plate-shaped, and has a first principal face and a second principal face on an opposite side of the first principal face; a negative-electrode terminal which is flat plate-shaped, and has a third principal face and a fourth principal face on an opposite side of the third principal face; a first electrode body comprising:
a first positive electrode which has a first positive electrode collector being a metal foil, as well as a first positive-electrode active material layer formed on the first positive electrode collector, and on which a first positive-electrode forming region where the first positive-electrode active material layer is formed on the first positive electrode collector, and a first positive-electrode non-forming region where the first positive-electrode active material layer is not formed on the first positive electrode collector, are formed;
a first negative electrode which has a first negative electrode collector being a metal foil, as well as a first negative-electrode active material layer formed on the first negative electrode collector, and on which a first negative-electrode forming region where the first negative-electrode active material layer is formed on the first negative electrode collector, and a first negative-electrode non-forming region where the first negative-electrode active material layer is not formed on the first negative electrode collector, are formed; and
a first separator which separates the first positive electrode and first negative electrode;
wherein the first electrode body is such that the first positive electrode, first negative electrode, and first separator are stacked and wound together, and that it has a first wound positive-electrode non-forming region constituted by the first positive-electrode non-forming region that has been wound, as well as a first wound negative-electrode non-forming region constituted by the first negative-electrode non-forming region that has been wound;
a second electrode body comprising:
a second positive electrode which has a second positive electrode collector being a metal foil, as well as a second positive-electrode active material layer formed on the second positive electrode collector, and on which a second positive-electrode forming region where the second positive-electrode active material layer is formed on the second positive electrode collector, and a second positive-electrode non-forming region where the second positive-electrode active material layer is not formed on the second positive electrode collector, are formed;
a second negative electrode which has a second negative electrode collector being a metal foil, as well as a second negative-electrode active material layer formed on the second negative electrode collector, and on which a second negative-electrode forming region where the second negative-electrode active material layer is formed on the second negative electrode collector, and a second negative-electrode non-forming region where the second negative-electrode active material layer is not formed on the second negative electrode collector, are formed; and
a second separator which separates the second positive electrode and second negative electrode;
wherein the second electrode body is such that the second positive electrode, second negative electrode, and second separator are stacked and wound together, and that it has a second wound positive-electrode non-forming region constituted by the second positive-electrode non-forming region that has been wound, as well as a second wound negative-electrode non-forming region constituted by the second negative-electrode non-forming region that has been wound; and
electrolytic solution which immerses the first electrode body and second electrode body; wherein the first wound positive-electrode non-forming region is joined to the first principal face, the first wound negative-electrode non-forming region is joined to the third principal face, the second wound positive-electrode non-forming region is joined to the second principal face, and the second wound negative-electrode non-forming region is joined to the fourth principal face.

2 . An electrochemical device according to claim 1 ,
wherein the first electrode body has a flat-wound structure constituted by the first positive electrode, first negative electrode, and first separator that are wound together into a first wound body shaped like a flat sheet; and wherein the second electrode body has a flat-wound structure constituted by the second positive electrode, second negative electrode, and second separator that are wound together into a second wound body shaped like a flat sheet.

3 . An electrochemical device according to claim 2 ,
wherein the first electrode body further has two lithium ion supply sources that are joined to a top face and bottom face of the first wound body, respectively; and wherein the second electrode body further has two lithium ion supply sources that are joined to a top face and bottom face of the second wound body, respectively.

4 . A method of manufacturing electrochemical device, comprising:
preparing:
a positive-electrode terminal which is flat plate-shaped, and has a first principal face and a second principal face on an opposite side of the first principal face;
a negative-electrode terminal which is flat plate-shaped, and has a third principal face and a fourth principal face on an opposite side of the third principal face;
a first electrode body comprising:
a first positive electrode which has a first positive electrode collector being a metal foil, as well as a first positive-electrode active material layer formed on the first positive electrode collector, and on which a first positive-electrode forming region where the first positive-electrode active material layer is formed on the first positive electrode collector, and a first positive-electrode non-forming region where the first positive-electrode active material layer is not formed on the first positive electrode collector, are formed;
a first negative electrode which has a first negative electrode collector being a metal foil, as well as a first negative-electrode active material layer formed on the first negative electrode collector, and on which a first negative-electrode forming region where the first negative-electrode active material layer is formed on the first negative electrode collector, and a first negative-electrode non-forming region where the first negative-electrode active material layer is not formed on the first negative electrode collector, are formed; and
a first separator which separates the first positive electrode and first negative electrode;
wherein the first electrode body is such that the first positive electrode, first negative electrode, and first separator are stacked and wound together, and that it has a first wound positive-electrode non-forming region constituted by the first positive-electrode non-forming region that has been wound, as well as a first wound negative-electrode non-forming region constituted by the first negative-electrode non-forming region that has been wound; and

a second electrode body comprising:
a second positive electrode which has a second positive electrode collector being a metal foil, as well as a second positive-electrode active material layer formed on the second positive electrode collector, and on which a second positive-electrode forming region where the second positive-electrode active material layer is formed on the second positive electrode collector, and a second positive-electrode non-forming region where the second positive-electrode active material layer is not formed on the second positive electrode collector, are formed;
a second negative electrode which

Assignees

• Taiyo Yuden Kk

Inventors

• Suzuki Satoshi
• Akiba Tomofumi

Classifications

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title

• H01G11/50 Primary

  specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation · CPC title

• H01G11/26

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

• H01M10/0587 Primary

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• H01G11/52

  Separators · CPC title