US 12,244,026 B2
Lid body and sealed battery
Yuki Sato, Toyota (JP); Yozo Uchida, Toyota (JP); Hideki Asadachi, Toyota (JP); Tsuyoshi Ehara, Toyota (JP); Syoichi Tsuchiya, Toyota (JP); Masataka Asai, Toyota (JP); Tsuyoshi Asano, Toyota (JP); Masahiro Uchimura, Toyota (JP); and Nozomi Tateyama, Okazaki (JP)
Assigned to PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Aichi-Ken (JP)
Filed by Prime Planet Energy & Solutions, Inc., Tokyo (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Aichi-ken (JP)
Filed on Nov. 23, 2021, as Appl. No. 17/534,264.
Claims priority of application No. 2020-198151 (JP), filed on Nov. 30, 2020.
Prior Publication US 2022/0173465 A1, Jun. 2, 2022
Int. Cl. H01M 50/167 (2021.01); H01M 50/15 (2021.01)
CPC H01M 50/167 (2021.01) [H01M 50/15 (2021.01)] 14 Claims
OG exemplary drawing
 
1. A lid body used in a sealed battery provided with a case body having an opening and accommodating an electrode body, the lid body plugging the opening and comprising:
a terminal member is selected from the group consisting of a positive electrode and a negative electrode, wherein a largest weight percentage of the terminal member is a first metal;
a sealing plate, wherein a largest weight percentage of the sealing plate is a second metal; and
a sealing material, wherein
the sealing plate has a mounting hole for attaching the terminal member,
the terminal member is inserted into the mounting hole and is attached to the sealing plate in a state where the sealing material is joined to a peripheral edge portion of the mounting hole, and
with as αS a coefficient of linear expansion at 25° C. of the sealing material, α1 as a coefficient of linear expansion at 25° C. of the first metal and α2 as a coefficient of linear expansion at 25° C. of the second metal, αL≤αS≤αH is satisfied, where αH is the higher value and αL is the lower value from among the α1 and α2,
at least part of the sealing material directly contacts the terminal member and is joined to the terminal member by a first anchor effect, and the sealing material is joined to the sealing plate by a second anchor effect, and
the sealing material comprises thermoplastic resin and an inorganic filler, and the coefficient as of linear expansion at 25° C. of the sealing material is from 1.6×10−5/K to 2.3×10−5/K.