Sony Corporation

Masanori Anzai

Naoyuki Sugeno

Shinji Hatake

Takayuki Yamahira

Toru Nagaura

Hisayuki Kato

Takeshi Meguro

Tsutomu Suehiro

Noriaki Kokubu

Kazunori Fujita

A battery includes: a battery element having a cathode and an anode; a package can containing the battery element and being electrically connected to one of the cathode and the anode; and external connection terminal being connected to the other one of the cathode and the anode; and having a plate-like base contained in the package can and a leading portion extending to outside of the package can; and an insulating member separating the external connection terminal from the battery element. The base of the external connection terminal is spaced from an internal wall face of the package can, and the insulating member has notches at a position where the base of the external connection terminal is layered on the insulating member in the thickness direction of the package can.

Battery with secure short-circuiting mechanism

A non-aqueous electrolyte secondary cell in which inner shorting may be prevented from occurring and which is improved in operational reliability and safety. The non-aqueous electrolyte secondary cell is comprised of an electrode unit loaded in a cell casing. The electrode unit is comprised at least of a strip-shaped cathode and a strip-shaped anode layered together and coiled longitudinally around a center pin. There is provided a pre-set clearance between the electrode unit and the cell casing so that (B&plus;C)/2A, where A, B and C denote the inner diameter of the cell casing, the maximum outer diameter of the electrode unit and the minimum outer diameter of the electrode unit, respectively, is equal to or more than 0.954 and equal to or less than 0.988. The wound electrode unit has a degree of tightness to give a deformation of no more than 8%.

Non-aqueous electrolyte secondary cell with a spirally wound electrode unit

A nonaqueous electrolyte secondary batter which comprises a negative electrode which comprises a carbonaceous material capable of doping and de-doping lithium, a positive electrode made of an active material which comprises a Li-containing metal complex oxide of the general formula, Li.sub.x MO.sub.2, wherein M represents at least one member selected from the group consisting of Co, Ni and Mn and 0.5.ltoreq.x.ltoreq.1, and a nonaqueous electrolyte which contains an electrolyte and an organic solvent therefor. The organic solvent is a mixed solvent of propylene carbonate and at least one member selected from the group consisting of diethyl carbonate and dipropyl carbonate.

Nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery is disclosed, which comprises an anode having a carbonaceous material as the anode active material which permits lithium to be doped and undoped and a current collector, a cathode having a lithium compound as the cathode active material which permits lithium to be doped and undoped, and a nonaqueous electrolyte. The cathode active material contains the primary active material of a first lithium compound having the potential which is more 'noble' than the potential of the current collector and the auxiliary active material of a second lithium compound having the potential which is more 'base' than the potential of the current collector. The auxiliary active material works to avoid the dissolution of the anode current collector at the final stage of discharge.

Growing community of inventors

Fukushima, Japan

Masanori Anzai