Sony Corporation

Sony Chemicals Corporation

Sony Chemical & Information Device Corporation

Masahiro Matsuyoshi

Yuji Furuuchi

Kazutaka Furuta

Masami Kawazu

Hisaya Tamura

A protective element has a heat-generating member and a low-melting metal member on a substrate, in which the low-melting metal member is blown out by the heat generated by the heat-generating member, wherein at least two strips of low-melting metal member are provided as the low-melting metal member, for example, between the pair of electrodes that pass current to the low-melting metal member, so that the lateral cross section of at least part of the low-melting metal member is substantially divided into at least two independent cross sections. This protective element has a shorter and more consistent operating time. It is preferable here to provide at least two strips of low-melting metal member between the pair of electrodes that pass current to the low-melting metal member. It is also preferable to provide one strip of low-melting metal member having a slit in its center, between the pair of electrodes that pass current to the low-melting metal member.

Protective element

A secondary battery deviceincluding multiple protective circuits U-Uconnected in parallel and each having two fuses f, fconnected in series, wherein a terminal tof each heater h is connected to a switch elementvia rectifier element D-D. Even if a potential difference is generated between terminals t, no residual current flows because any one of the rectifier elements D-Dis reverse-biased.

Secondary battery devices

Growing community of inventors

Tochigi, Japan

Masahiro Matsuyoshi