US 12,176,530 B2
Electrode plate and method for manufacturing same, and secondary battery and method for manufacturing same
Kazuaki Tamura, Hyogo (JP); Yoshifumi Magari, Hyogo (JP); Atsutoshi Ako, Hyogo (JP); Akira Nishida, Hyogo (JP); Kentaro Tsukamoto, Hyogo (JP); and Tomoyuki Yamada, Hyogo (JP)
Assigned to SANYO Electric Co., Ltd., Osaka (JP)
Appl. No. 17/428,558
Filed by SANYO Electric Co., Ltd., Daito (JP)
PCT Filed Dec. 24, 2019, PCT No. PCT/JP2019/050461
§ 371(c)(1), (2) Date Aug. 4, 2021,
PCT Pub. No. WO2020/170598, PCT Pub. Date Aug. 27, 2020.
Claims priority of application No. 2019-027969 (JP), filed on Feb. 20, 2019.
Prior Publication US 2022/0109147 A1, Apr. 7, 2022
Int. Cl. H01M 4/46 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/463 (2013.01) [H01M 2004/028 (2013.01); H01M 2220/20 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An electrode plate having a core body made of metal and an active material layer formed on the core body, wherein
the core body has a thick-walled part on an end side of the core body, the thick-walled part having a larger thickness than a thickness of a portion of the core body having the active material layer formed on both surfaces of the core body,
the core body includes:
a first region extending from the portion of the core body having the active material layer formed on the both surfaces of the core body and having a distal end portion thereof protruding into the thick-walled part in a protruding direction; and
a second region positioned outside the distal end portion of the first region of the thick-walled part,
an average of respective maximum diameters of metal crystal grains constituting the first region is smaller than an average of respective maximum diameters of metal crystal grains constituting the second region, and
a ratio (W1/W2) of a width W1 of the distal end portion of the first region in the protruding direction to a width W2 of the thick-walled part in the protruding direction is 0.15 or more and no more than 1 on a cross section in a thickness direction of the core body and perpendicular to a direction in which the end side extends.