Mitsumi Electric Company Ltd.

Koichi Murano

Takashi Takeda

Takatoshi Itagaki

Ryota Kageyama

Koji Yano

Takeshi Yamaguchi

Junji Takeshita

A battery protection circuit for protecting a secondary battery, the battery protection circuit not having a CPU, includes a non-volatile memory into which characteristics data determining protective characteristics of the battery protection circuit are writable; and a protection operation circuit which performs a protection operation of the secondary battery based on the characteristics data read out of the non-volatile memory.

Battery protection circuit, battery protection apparatus, and battery pack

A secondary battery protection circuit for protecting a secondary battery including: a power supply terminal; a protection operation circuit configured to monitor a state of the secondary battery through the power supply terminal to generate a signal for turning on/off conduction of a current path between the secondary battery and a load according to a protection state determined by the monitored state of the secondary battery; a nonvolatile memory in which data is written by a writing voltage being provided at the power supply terminal, an operation of the secondary battery protection circuit being controlled by the data; a voltage generation circuit configured to generate a provision voltage which is provided to a low withstand voltage circuit; and a control circuit configured to enable the nonvolatile memory to store the data therein in accordance with the protection state upon an input voltage being greater than a determination threshold voltage.

Secondary battery protection circuit, secondary battery protection device, battery pack and method of writing data

Growing community of inventors

Tokyo, Japan

Koichi Murano