Electrochemical device

Patent metadata

Field	Value
Publication number	US-2018315982-A1
Application number	US-201615771309-A
Country	US
Kind code	A1
Filing date	Nov 2, 2016
Priority date	Nov 25, 2015
Publication date	Nov 1, 2018
Grant date	—

Abstract

An electrochemical device includes a storage element in which two types of electrodes are superposed on each other with a separator interposed therebetween and an outer container made of a flexible film that houses the storage element and an electrolyte solution, the two types of electrodes each including an active material-applied portion where an active material layer is formed on current collector 9, and an active material-non-applied portion, wherein each of the two types of electrodes is provided with an electrode terminal 7 and support tab 13, one end portion of electrode terminal 7 being superposed on the active material-non-applied portion of the electrode in the outer container, the other end portion of electrode terminal 7 extending to an outside of the outer container, support tab 13 sandwiching the active material-non-applied portion along with the one end portion of electrode terminal 7 in the outer container, and the active material-non-applied portion, electrode terminal 7, and support tab 13 are joined at a position where they are superposed on one another. Support tab 13 has a planar shape without any corner portion of 90 degrees or less.

First claim

1 . An electrochemical device comprising:
a storage element in which two types of electrodes are superposed on each other with a separator interposed therebetween; and an outer container made of a flexible film that houses the storage element and an electrolyte solution, wherein the two types of electrodes each include an active material-applied portion where an active material layer is formed on a current collector, and an active material-non-applied portion where no active material layer is formed on the current collector, each of the two types of electrodes is provided with an electrode terminal and a support tab, one end portion of the electrode terminal being superposed on the active material-non-applied portion of the electrode in the outer container, the other end portion of the electrode terminal extending to an outside of the outer container, the support tab and the one end portion of the electrode terminal sandwiching the active material-non-applied portion in the outer container, and the active material-non-applied portion, the electrode terminal, and the support tab being joined at a position where they are superposed on one another, and the support tab has a planar shape without any corner portions of 90 degrees or less.

2 . The electrochemical device according to claim 1 , wherein
the support tab has a planar shape without any portion in which two linear sides cross at one point.

3 . The electrochemical device according to claim 1 , wherein
a plurality of active material-non-applied portions of the same type of electrodes are superposed on one another to form an assembly, and the assembly, the electrode terminal, and the support tab are joined at a position where they are superposed on one another in a state where the assembly is sandwiched between the one end portion of the electrode terminal and the support tab.

4 . The electrochemical device according to claim 1 , wherein
the support tab has a planar shape having four rounded corner portions of a quadrangle.

5 . The electrochemical device according to claim 4 , wherein
a curvature radius of the rounded corner portion is 1.0 to 2.0 mm.

6 . The electrochemical device according to claim 1 , wherein
the support tab has a planar shape in which end portions of two parallel straight lines are connected with each other through a circular arc.

7 . The electrochemical device according to claim 1 , wherein
the support tab has an elliptical planar shape.

8 . The electrochemical device according to claim 1 , wherein
the electrochemical device is a secondary battery.

9 . The electrochemical device according to claim 2 , wherein
a plurality of active material-non-applied portions of the same type of electrodes are superposed on one another to form an assembly, and the assembly, the electrode terminal, and the support tab are joined at a position where they are superposed on one another in a state where the assembly is sandwiched between the one end portion of the electrode terminal and the support tab.

10 . The electrochemical device according to claim 2 , wherein
the support tab has a planar shape having four rounded corner portions of a quadrangle.

11 . The electrochemical device according to claim 10 , wherein
a curvature radius of the rounded corner portion is 1.0 to 2.0 mm.

12 . The electrochemical device according to claim 2 , wherein
the support tab has a planar shape in which end portions of two parallel straight lines are connected with each other through a circular arc.

13 . The electrochemical device according to claim 2 , wherein
the support tab has an elliptical planar shape.

14 . The electrochemical device according to claim 2 , wherein
the electrochemical device is a secondary battery.

15 . The electrochemical device according to claim 3 , wherein
the support tab has a planar shape having four rounded corner portions of a quadrangle.

16 . The electrochemical device according to claim 15 , wherein
a curvature radius of the rounded corner portion is 1.0 to 2.0 mm.

17 . The electrochemical device according to claim 3 , wherein
the support tab has a planar shape in which end portions of two parallel straight lines are connected with each other through a circular arc.

18 . The electrochemical device according to claim 3 , wherein
the support tab has an elliptical planar shape.

19 . The electrochemical device according to claim 3 , wherein
the electrochemical device is a secondary battery.

Assignees

• Nec Energy Devices Ltd

Inventors

• Daidoji Takao
• Takeyama Masaki
• Watanabe Yoshitaro

Classifications

• H01M4/02

  Electrodes composed of, or comprising, active material · CPC title

• H01G11/72

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

• H01G11/76 Primary

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

• H01M50/129

  with two or more layers of only organic material · CPC title