公开(公告)号：US10535851B2

公开(公告)日：2020-01-14

申请号：US16013229

申请日：2018-06-20

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Tomohiko Yokoyama ,  Yoshiyuki Muraoka ,  Takahiro Fukuoka ,  Kyosuke Miyata

IPC: H01M2/12 ,  H01M10/04 ,  H01M2/08 ,  H01M10/0525 ,  H01M10/0587 ,  H01M2/26 ,  H01M4/525 ,  H01M4/02

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.

公开(公告)号：US10026938B2

公开(公告)日：2018-07-17

申请号：US15268093

申请日：2016-09-16

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Tomohiko Yokoyama ,  Yoshiyuki Muraoka ,  Takahiro Fukuoka ,  Kyosuke Miyata

IPC: H01M2/12 ,  H01M10/04 ,  H01M2/08 ,  H01M10/0525 ,  H01M10/0587 ,  H01M2/26 ,  H01M4/525 ,  H01M4/02

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.