Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Tsuyoshi Kaito

Futoshi Tanigawa

Naoto Arai

Hiroshi Yoshizawa

Shinji Mino

A lithium ion secondary battery includes: (a) a positive electrode plate comprising an active material part and a current collector carrying the active material part, the active material part comprising a positive electrode active material capable of absorbing or desorbing a lithium ion during charge and discharge; (b) a negative electrode plate comprising an active material part and a current collector carrying the active material part, the active material part comprising a negative electrode active material capable of absorbing or desorbing a lithium ion during charge and discharge; (c) a separator interposed between the positive and negative electrode plates; (d) an electrolyte; and (e) a battery case accommodating the positive and negative electrode plates, the separator, and the electrolyte. The positive and negative electrode plates are wound with the separator interposed therebetween, thereby to form an electrode plate assembly. The electrode plate assembly is so configured that each lengthwise edge of the positive electrode current collector is positioned on an outer side of each lengthwise edge of the negative electrode active material part.

Lithium ion secondary battery

A non-aqueous electrolyte rechargeable battery is provided with a switch element in a circuit for connecting the battery to an external power source, the switch element being operable in response to a change in temperature of the battery, thereby disconnecting the battery from the circuit and establishing a short circuit across the positive electrode and the negative electrode, the switch element being capable of restoring to its initial state in response to a change in temperature of the battery.

Growing community of inventors

Kyoto, Japan

Tsuyoshi Kaito