Samsung Sdi Co., Inc.

Eui-Sun Hong

Jung-Joon Park

Yoon-Tai Kwak

Sung-Jae Cho

Masaki Koike

Jae-Chul Um

Yasuaki Hiramura

A secondary battery includes a case having positive and negative electrodes, a safety device attached to a surface of the case and having a resistance value which changes during swelling of the case, and a protective circuit module attached to a side of the case while being electrically connected to the safety device. The resistance value of the safety device changes as the case swells, and the protective circuit module reduces or interrupts charging/discharging currents in response thereto. The safety device can be used for all secondary batteries regardless of capacity, can quickly react against abruptly rising internal temperature and rapid swelling, and can stably prevent swelling which occurs above an allowable temperature.

Secondary battery including protective circuit module to protect battery when swelling occurs

A secondary battery having a simplified structure by which a lead of a safety device can be adhered to the battery includes an electrode unit having a positive electrode plate, a negative electrode plate and a separator disposed therebetween, a can having a bottom portion and made of aluminum or an aluminum alloy, the can in which the electrode unit and an electrolytic solution are accommodated and sealed, and a surface coating provided on at least an outer surface of the bottom portion of the can to which the lead is attached.

Secondary battery and manufacturing method thereof

Growing community of inventors

Cheonan-si, South Korea

Eui-Sun Hong