US 12,278,401 B2
Non-aqueous electrolyte secondary battery
Natsuhiko Mukai, Osaka (JP); Satoshi Yamamoto, Osaka (JP); Masaki Deguchi, Hyogo (JP); Taisuke Yamamoto, Nara (JP); Atsushi Ueda, Osaka (JP); and Masanobu Takeuchi, Osaka (JP)
Assigned to PANASONIC ENERGY CO., LTD., Osaka (JP); and PANASONIC HOLDINGS CORPORATION, Osaka (JP)
Appl. No. 17/042,298
Filed by SANYO Electric Co., Ltd., Daito (JP); and Panasonic Corporation, Kadoma (JP)
PCT Filed Apr. 2, 2019, PCT No. PCT/JP2019/014635
§ 371(c)(1), (2) Date Sep. 28, 2020,
PCT Pub. No. WO2019/194181, PCT Pub. Date Oct. 10, 2019.
Claims priority of application No. 2018-073788 (JP), filed on Apr. 6, 2018.
Prior Publication US 2021/0119289 A1, Apr. 22, 2021
Int. Cl. H01M 50/593 (2021.01); H01M 10/04 (2006.01); H01M 10/0587 (2010.01); H01M 50/107 (2021.01); H01M 50/186 (2021.01); H01M 50/193 (2021.01); H01M 50/533 (2021.01); H01M 50/534 (2021.01); H01M 50/536 (2021.01); H01M 50/545 (2021.01); H01M 50/595 (2021.01)
CPC H01M 50/593 (2021.01) [H01M 10/0422 (2013.01); H01M 10/0587 (2013.01); H01M 50/107 (2021.01); H01M 50/533 (2021.01); H01M 50/534 (2021.01); H01M 50/536 (2021.01); H01M 50/545 (2021.01); H01M 50/595 (2021.01); H01M 50/186 (2021.01); H01M 50/193 (2021.01)] 5 Claims
OG exemplary drawing
 
1. A non-aqueous electrolyte secondary battery comprising:
a spiral-type electrode body in which a positive electrode and a negative electrode are wound with a separator located therebetween;
a bottomed cylindrical outer can that holds therein the electrode body; and
a sealing body that closes off an opening of the outer can and that functions as a positive electrode terminal, wherein
the electrode body has a positive electrode lead which has a first end portion being one lengthwise end of the positive electrode lead, and a second end portion located toward a side opposite to the first end portion, the second end portion being the other lengthwise end of the positive electrode lead;
the positive electrode lead comprises:
only a single lead base member made of metal and having a first surface joined to the positive electrode, and a second surface located on an opposite side of the first surface; and
an insulating ceramic layer composed only of an insulating inorganic compound or comprising the inorganic compound and a binder which binds particles of the inorganic compound wherein a content of the binder is from 1 to 10% by mass relative to the mass of the inorganic compound, the ceramic layer being formed directly on the second surface of the single lead base member in at least an area facing the negative electrode via the separator,
the ceramic layer is formed over the entire area facing the negative electrode via the separator, and additionally in the first end portion on the second surface of the single lead base member, wherein the ceramic layer in the first end portion is formed only within a range of 3 mm from a first end; and
the single lead base material includes, on the second surface thereof a region which is sandwiched between the ceramic layer formed in the first end portion and the area facing the negative electrode via the separator, and is not covered by the ceramic layer, the region being a region where a welded portion which is welded to the sealing body is formed.