US 12,224,139 B2
Breaker and safety circuit equipped with the same, and secondary battery pack
Masashi Namikawa, Suita (JP)
Assigned to Bourns KK, Suita (JP)
Appl. No. 18/248,753
Filed by Bourns KK, Suita (JP)
PCT Filed Oct. 18, 2021, PCT No. PCT/JP2021/038358
§ 371(c)(1), (2) Date Apr. 12, 2023,
PCT Pub. No. WO2022/085611, PCT Pub. Date Apr. 28, 2022.
Claims priority of application No. 2020-175316 (JP), filed on Oct. 19, 2020.
Prior Publication US 2023/0402242 A1, Dec. 14, 2023
Int. Cl. H01H 37/54 (2006.01)
CPC H01H 37/5427 (2013.01) 8 Claims
OG exemplary drawing
 
1. A breaker comprising:
a first terminal piece on which a fixed contact is formed;
a movable piece having a movable contact, for pressing the movable contact against the fixed contact so as to contact therewith;
a thermally-actuated element deforming with a change in temperature and moving the movable piece so that the movable contact is separated from the fixed contact; and
a second terminal piece electrically connected to the movable piece, wherein
the movable piece is provided, in a contact portion contacting with the second terminal piece, with a protrusion projecting toward the thermally-actuated element,
the movable piece is welded to the second terminal piece in the contact portion, and
a welded portion between the movable piece and the second terminal piece overlaps with the protrusion in a longitudinal direction of the movable piece.