Cylindrical lithium-ion cell

Patent metadata

Field	Value
Publication number	US-10026938-B2
Application number	US-201615268093-A
Country	US
Kind code	B2
Filing date	Sep 16, 2016
Priority date	Dec 28, 2011
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A cylindrical lithium ion battery in which an electrode group formed by winding a positive electrode and a negative electrode is housed in a battery case is disclosed. A sealing plate seals an opening of the battery case. An insulating plate having a plurality of openings is provided on a side of the electrode group closer to the sealing plate. The plurality of openings include a first hole with a largest opening area, and a plurality of second holes with opening areas smaller than the opening area of the first hole. An opening ratio of the first hole is 12% or more and 40% or less; a sum of opening ratios of the second holes is 0.3% or more and 10% or less; and a total opening ratio of all the openings is 20% or more and 50% or less.

First claim

The invention claimed is:

1. A cylindrical lithium ion battery in which an electrode group formed by winding a positive electrode and a negative electrode, with a separator interposed therebetween, is housed in a battery case, wherein
a sealing plate having a gas exhaust valve seals an opening of the battery case, with a gasket interposed therebetween,
a positive electrode lead is connected to the positive electrode,
an insulating plate having a plurality of openings is provided on a side of the electrode group closer to the sealing plate,
the plurality of openings include a first hole with a largest opening area, and a plurality of second holes each with an opening area smaller than the opening area of the first hole,
the first hole is present on one side of the insulating plate closer to a periphery, with respect to a center, of the insulating plate, and
the positive electrode lead is led from the first hole or any one of the second holes.

2. The cylindrical lithium ion battery of claim 1 , wherein the positive electrode lead is led from the first hole.

3. The cylindrical lithium ion battery of claim 1 , wherein a total opening ratio of all the openings is 20% or more and 50% or less.

4. The cylindrical lithium ion battery of claim 1 , wherein a total opening ratio of all the openings is 30% or more and 50% or less.

5. The cylindrical lithium ion battery of claim 1 , wherein a total opening ratio of all the openings is 20% or more and 40% or less.

6. The cylindrical lithium ion battery of claim 1 , wherein an opening ratio of the first hole is 12% or more and 40% or less.

7. The cylindrical lithium ion battery of claim 1 , wherein a sum of opening ratios of the second holes is 0.3% or more and 10% or less.

8. The cylindrical lithium ion battery of claim 1 , wherein each of the plurality of second holes has a same opening area.

9. The cylindrical lithium ion battery of claim 1 , wherein the plurality of second holes have opening areas different from each other.

10. The cylindrical lithium ion battery of claim 1 , wherein a shape of the first hole and a shape of each of the second holes are different.

11. A cylindrical lithium ion battery in which an electrode group formed by winding a positive electrode and a negative electrode, with a separator interposed therebetween, is housed in a battery case, wherein
a sealing plate having a gas exhaust valve seals an opening of the battery case, with a gasket interposed therebetween,
an insulating plate having a plurality of openings is provided on a side of the electrode group closer to the sealing plate,
the plurality of openings include a first hole with a largest opening area, and a plurality of second holes each with an opening area smaller than the opening area of the first hole, and
a total opening ratio of all the openings is 20% or more and 50% or less.

12. The cylindrical lithium ion battery of claim 11 , wherein the plurality of second holes have opening areas different from each other.

13. The cylindrical lithium ion battery of claim 11 , wherein a shape of the first hole and a shape of each of the second holes are different.

Assignees

• Panasonic Ip Man Co Ltd
• Panasonic Ip Man Co Ltd

Inventors

• Yokoyama Tomohiko
• Muraoka Yoshiyuki
• Fukuoka Takahiro
• Miyata Kyosuke

Classifications

• H01M50/186

  characterised by the disposition of the sealing members · CPC title

• H01M50/193

  Organic material · CPC title

• H01M50/536

  characterised by the method of fixing the leads to the electrodes, e.g. by welding · CPC title

• H01M10/0422 Primary

  Cells or battery with cylindrical casing · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title