Protective element and battery pack

Japanese Patent JP6364243

B2

Provided are a protective element and a battery pack that maintain current capacity at the time of overcurrent protection and that use heat emitted by a heating element to reliably cause melting. The protective element is provided with: a first insulating substrate (55); first and second external electrodes (51, 52); a heating element (57) that is provided to the rear surface (55b) side of the first insulating substrate (55); front/rear surface electrodes (56, 64) that are provided between the first external electrode (51) and the second external electrode (52) of the surface (55a) of the first insulating substrate (55); a meltable conductor (53) that is layered across the first and second external electrodes (51, 52) so as to overlap with the surface electrode (56) on the front surface (55a); a through hole (58) comprising a conductive layer (65) on the inner surface thereof; and a preliminary solder (66) that is used to fill the interior of the through hole (58). The heat of the heating element (57) causes the preliminary solder (66) and the meltable conductor (53) to melt. The wettability of the front/rear surface electrodes (56, 64), the conductor layer (65) that is within the through hole (58), and the like causes the melted preliminary solder (66) and the meltable conductor (53) to move to the rear surface (55b) side of the high-temperature first insulating substrate (55).

Takeo Kimura
Koji Sato
Yoshihiro Yoneda

JP2014113044A

July 25, 2018

May 30, 2014

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Dexerials Co., Ltd.

H01H37/76; H01M2/10; H01M2/34; H01M10/44; H01M10/48; H02H5/04; H02H7/18

JP2011175893A
JP2013149606A
JP2001313202A
JP11273541A
JP2004185960A
JP58122350U
JP47043958A
JP2008112735A
JP2009267371A

WO2013146889A1

Nobuhiro Noguchi

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