公开(公告)号：US12155041B2

公开(公告)日：2024-11-26

申请号：US17282094

申请日：2019-09-24

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Hiroyuki Okuda ,  Hideharu Takezawa ,  Yuko Ogawa ,  Yuki Tokuda

IPC: H01M10/0587 ,  H01M4/36 ,  H01M4/48 ,  H01M4/505 ,  H01M4/525 ,  H01M4/587 ,  H01M50/183 ,  H01M50/531 ,  H01M50/534 ,  H01M50/536

Abstract: The cylindrical secondary battery is provided with a wound electrode body, a positive electrode tab connected to a positive electrode, a cylindrical case body for housing the electrode body and the positive electrode tab, and a sealing body for sealing an opening of the case body. A negative electrode has, at a winding end of the negative electrode, a negative electrode current collector exposure section where no negative electrode active material layer is disposed, and the negative electrode current collector exposure section is disposed in contact with an inner surface of the case body. The positive electrode tab is disposed at the center in the longitudinal direction of the positive electrode and in a region where the number of layers of the positive electrode in a radial direction is smaller than in other regions in a cross-sectional area of the wound electrode body.

公开(公告)号：US11677064B2

公开(公告)日：2023-06-13

申请号：US16771394

申请日：2018-10-26

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yuki Tokuda ,  Hideharu Takezawa ,  Yuko Ogawa ,  Hiroyuki Okuda

IPC: H01M4/13 ,  H01M50/531 ,  H01M10/0587 ,  H01M10/0525 ,  H01M50/586 ,  H01M50/595 ,  H01M50/534 ,  H01M50/536

CPC classification number: H01M4/13 ,  H01M10/0525 ,  H01M10/0587 ,  H01M50/534 ,  H01M50/536 ,  H01M50/586 ,  H01M50/595

Abstract: An electrode group includes a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a positive electrode lead electrically connected to the positive electrode. The positive electrode includes a positive electrode current collector and a positive electrode active material layer carried on each main surface of the positive electrode current collector. The positive electrode current collector has an exposed section that does not carry the positive electrode active material layer. The negative electrode includes a negative electrode current collector and a negative electrode active material layer carried on each main surface of the negative electrode current collector and has a first region and a second region. The mass of the negative electrode active material layer in the first region per unit area is smaller than the mass of the negative electrode active material layer in the second region per unit area.

公开(公告)号：US12237495B2

公开(公告)日：2025-02-25

申请号：US18140877

申请日：2023-04-28

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yuki Tokuda ,  Hideharu Takezawa ,  Yuko Ogawa ,  Hiroyuki Okuda

IPC: H01M4/13 ,  H01M10/0525 ,  H01M10/0587 ,  H01M50/531 ,  H01M50/534 ,  H01M50/536 ,  H01M50/586 ,  H01M50/595

Abstract: An electrode group includes a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a positive electrode lead electrically connected to the positive electrode. The positive electrode includes a positive electrode current collector and a positive electrode active material layer carried on each main surface of the positive electrode current collector. The positive electrode current collector has an exposed section that does not carry the positive electrode active material layer. The negative electrode includes a negative electrode current collector and a negative electrode active material layer carried on each main surface of the negative electrode current collector and has a first region and a second region. The mass of the negative electrode active material layer in the first region per unit area is smaller than the mass of the negative electrode active material layer in the second region per unit area.

公开(公告)号：US20230275208A1

公开(公告)日：2023-08-31

申请号：US18140877

申请日：2023-04-28

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yuki Tokuda ,  Hideharu Takezawa ,  Yuko Ogawa ,  Hiroyuki Okuda

IPC: H01M4/13 ,  H01M10/0525 ,  H01M10/0587 ,  H01M50/586 ,  H01M50/595 ,  H01M50/534 ,  H01M50/536

CPC classification number: H01M4/13 ,  H01M10/0525 ,  H01M10/0587 ,  H01M50/586 ,  H01M50/595 ,  H01M50/534 ,  H01M50/536

Abstract: An electrode group includes a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a positive electrode lead electrically connected to the positive electrode. The positive electrode includes a positive electrode current collector and a positive electrode active material layer carried on each main surface of the positive electrode current collector. The positive electrode current collector has an exposed section that does not carry the positive electrode active material layer. The negative electrode includes a negative electrode current collector and a negative electrode active material layer carried on each main surface of the negative electrode current collector and has a first region and a second region. The mass of the negative electrode active material layer in the first region per unit area is smaller than the mass of the negative electrode active material layer in the second region per unit area.

公开(公告)号：US11545721B2

公开(公告)日：2023-01-03

申请号：US16771053

申请日：2018-10-26

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yuko Ogawa ,  Hideharu Takezawa ,  Yuki Tokuda ,  Hiroyuki Okuda

IPC: H01M50/449 ,  H01M50/46 ,  H01M4/133 ,  H01M4/134 ,  H01M4/38 ,  H01M4/48 ,  H01M4/583 ,  H01M4/62 ,  H01M10/04 ,  H01M10/0525 ,  H01M10/0587

Abstract: A secondary battery includes an electrode assembly including a positive electrode, a negative electrode, a first separator disposed on one side of the surface of the negative electrode and having a thickness T1, and a second separator disposed on the other side of the surface of the negative electrode and having a thickness T2. The thickness T2 of the second separator is larger than the thickness T1 of the first separator. The first separator includes a first porous film having a porosity P1, and the second separator includes a second porous film having a porosity P2. At least one of the first separator and the second separator includes a heat resistant layer. The positive electrode, the first separator, the negative electrode and the second separator are wound together such that the first separator is arranged on the outer side and the second separator is arranged on the inner side.

公开(公告)号：US20210376391A1

公开(公告)日：2021-12-02

申请号：US17282094

申请日：2019-09-24

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Hiroyuki Okuda ,  Hideharu Takezawa ,  Yuko Ogawa ,  Yuki Tokuda

IPC: H01M10/0587 ,  H01M50/531 ,  H01M4/505 ,  H01M4/525 ,  H01M4/36 ,  H01M4/48 ,  H01M4/587 ,  H01M50/183

Abstract: The cylindrical secondary battery is provided with a wound electrode body, a positive electrode tab connected to a positive electrode, a cylindrical case body for housing the electrode body and the positive electrode tab, and a sealing body for sealing an opening of the case body. A negative electrode has, at a winding end of the negative electrode, a negative electrode current collector exposure section where no negative electrode active material layer is disposed, and the negative electrode current collector exposure section is disposed in contact with an inner surface of the case body. The positive electrode tab is disposed at the center in the longitudinal direction of the positive electrode and in a region where the number of layers of the positive electrode in a radial direction is smaller than in other regions in a cross-sectional area of the wound electrode body.

公开(公告)号：US20200303708A1

公开(公告)日：2020-09-24

申请号：US16771053

申请日：2018-10-26

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yuko Ogawa ,  Hideharu Takezawa ,  Yuki Tokuda ,  Hiroyuki Okuda

IPC: H01M2/16 ,  H01M10/04 ,  H01M10/0525 ,  H01M10/0587 ,  H01M4/38 ,  H01M4/134 ,  H01M4/48 ,  H01M4/583 ,  H01M4/133 ,  H01M4/62

Abstract: A secondary battery includes an electrode assembly including a positive electrode, a negative electrode, a first separator disposed on one side of the surface of the negative electrode and having a thickness T1, and a second separator disposed on the other side of the surface of the negative electrode and having a thickness T2. The thickness T2 of the second separator is larger than the thickness T1 of the first separator. The first separator includes a first porous film having a porosity P1, and the second separator includes a second porous film having a porosity P2. At least one of the first separator and the second separator includes a heat resistant layer. The positive electrode, the first separator, the negative electrode and the second separator are wound together such that the first separator is arranged on the outer side and the second separator is arranged on the inner side.