Sony Corporation

Tadashi Miebori

Hiroyuki Suzuki

Yuzuru Fukushima

Shinji Hatake

Takeshi Meguro

Yoshihiro Dokko

Noriaki Kokubu

A battery pack is provided. The battery pack includes a nonaqueous electrolyte secondary battery that includes a substantially thin-plate-shaped battery element covered with a laminated sheet such that a positive electrode terminal and a negative electrode terminal are exposed, and has a first end face from which the positive electrode terminal and the negative electrode terminal are led out. An exterior casing covers five faces of the nonaqueous electrolyte secondary battery, the five faces excluding a second end face next to the first end face. A support covers the second end face of the nonaqueous electrolyte secondary battery. At least one of the positive electrode terminal and the negative electrode terminal is extended along a first connection portion provided for the first end face and a second connection portion provided for the second end face and is connected to an external power supply provided for the support.

Battery pack and battery-pack exterior casing

A battery with improved safety that can more surely short-circuit electrodes when flattened out by the external force is provided. A center pin () is inserted in the center of a spirally wound electrode body formed by layering and spirally winding a cathode and an anode with a separator in between. The center pin () has a cut line () provided in the longitudinal direction and a first cutout () vertically crossing the cut line (). When flattened out by the external force, a corner () at an intersection of the cut line () and the first cutout () is projected, and short-circuit is surely generated. Further, it is preferable that the center pin () has a second cutout () in the direction perpendicular to the cut line () in a position facing the cut line () in the circumferential direction. It is also preferable that the center pin () has a cross sectional shape of an oval or an ellipse, and the cut line () is provided in a position where the diameter of the oval or the ellipse is the largest.

Battery and center pin

A battery with improved safety which can establish a short circuit between electrodes more reliably when the battery is crushed by an external force is provided. A battery includes a battery element including a cathode and an anode, a battery can containing the battery element, and a conductive short circuit member arranged in a gap between the battery element and the battery can, the short circuit member capable of biting into the battery element when the battery can is deformed.

Growing community of inventors

Fukushima, Japan

Tadashi Miebori