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公开(公告)号：US10573903B2
公开(公告)日：2020-02-25
申请号：US15573566
申请日：2016-06-20
Inventor： Yuki Suehiro , Seiichi Aoki , Yasuhiro Suzuki , Katsuhisa Wadasaki
Abstract: In a winding-type battery, the first electrode and the second electrode are wound via the separator to form an electrode group having first and second end surfaces. The first electrode includes a first current collector sheet, and a first active material layer formed on a surface of the first current collector sheet. A first current collecting lead is connected to the first electrode. The second electrode includes a second current collector sheet, and a second active material layer formed on a surface of the second current collector sheet. A second current collecting lead is connected to the second electrode. At an end of the first electrode that is disposed on the first end surface and/or an end of the first electrode that is disposed on the second end surface, at least a winding termination portion located on the outermost periphery of the electrode group has a notch.
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公开(公告)号：US12159974B2
公开(公告)日：2024-12-03
申请号：US16651945
申请日：2018-09-27
Inventor： Tomohiro Ueda , Seiichi Aoki
IPC: H01M10/0587 , H01M50/417 , H01M50/426 , H01M50/457
Abstract: An aspect of the present invention relates to a cylindrical secondary battery including a bottomed cylindrical battery case having an opening, an electrode group, an electrolyte solution, the electrode group and the electrolyte solution being housed in the battery case, and a sealing member blocking the opening of the battery case. The electrode group includes a positive electrode, a negative electrode, and a separator placed between the positive electrode and the negative electrode and is formed by winding the positive electrode and the negative electrode with the separator therebetween. The negative electrode includes a negative electrode current collector and a negative electrode mix layer formed on at least one principal surface of the negative electrode current collector. The positive electrode includes a positive electrode current collector and a positive electrode mix layer formed on at least one principal surface of the positive electrode current collector. The separator includes an inner non-contact region which is located on the inner peripheral side of the electrode group and which has both surfaces that are in contact with none of the negative electrode mix layer and the positive electrode mix layer. The length of the inner non-contact region is 5% or more of the length of the separator in a winding direction of the electrode group. According to the present invention, a compact cylindrical battery with particularly excellent charge-discharge cycle characteristics in association with quick charge can be provided.
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公开(公告)号：US11502337B2
公开(公告)日：2022-11-15
申请号：US16767544
申请日：2018-10-31
Inventor： Seiichi Aoki
IPC: H01M4/13 , H01M50/107 , H01M10/0587 , H01M50/186 , H01M10/04 , H01M10/0525 , H01M10/056 , H01M4/02
Abstract: A cylindrical secondary battery includes a bottomed cylindrical battery case having an opening, an electrode group, an electrolyte solution, and a sealing member blocking the opening of the battery case. The electrode group includes a positive electrode, a negative electrode, and a separator. The negative electrode includes a negative electrode current collector and a negative electrode mix layer placed on at least one principal surface of the negative electrode current collector. The negative electrode mix layer includes a non-facing region not facing the positive electrode mix layer. The density of the negative electrode mix layer is 1.25 g/cm3 to 1.43 g/cm3, the ratio of the entire length of the non-facing region to the entire length of the negative electrode mix layer is 0.09 or more, and the inside diameter of a hollow section of the electrode group is 2.0 mm or less.
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