US 12,283,653 B2
Secondary battery and method for manufacturing the same
Naoto Akizuki, Nagaokakyo (JP); Yusuke Tanji, Nagaokakyo (JP); and Keisuke Nishimoto, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Nagaokakyo (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Sep. 28, 2021, as Appl. No. 17/487,640.
Application 17/487,640 is a continuation of application No. PCT/JP2020/013272, filed on Mar. 25, 2020.
Claims priority of application No. 2019-067836 (JP), filed on Mar. 29, 2019.
Prior Publication US 2022/0029247 A1, Jan. 27, 2022
Int. Cl. H01M 50/463 (2021.01); H01M 10/0525 (2010.01); H01M 10/0587 (2010.01); H01M 50/469 (2021.01); H01M 50/103 (2021.01)
CPC H01M 10/0525 (2013.01) [H01M 10/0587 (2013.01); H01M 50/469 (2021.01); H01M 50/103 (2021.01)] 20 Claims
OG exemplary drawing
 
1. A secondary battery comprising:
a wound electrode assembly in which a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode are wound about a winding axis; and
a current collecting tab at a first end of the wound electrode assembly along a direction of the winding axis,
wherein the wound electrode assembly has a separator extension portion in which the separator extends more than the positive electrode and the negative electrode toward a second end of the wound electrode assembly along the direction of the winding axis, the second end being opposite the first end,
the separator has a bent shape that protrudes toward an outer peripheral side of the wound electrode assembly at least at a part of the separator extension portion in a sectional view passing through the winding axis, and
wherein the bent shape is a shape in which the separator is, in the separator extension portion, firstly bent toward the outer peripheral side of the wound electrode assembly and then secondly bent toward an inner peripheral side of the wound electrode assembly in a direction toward a tip of the separator.