Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Masaru Kawabe

Takeshi Ishimaru

Yoshinori Iwaizono

Shoji Konishi

Shigeru Kajiwara

Katsuyuki Shirasawa

Mikinari Shimada

Masato Fujikawa

A secondary-battery internal short detection apparatus is provided which is capable of precisely detecting an internal short being generated in a secondary-battery. In this apparatus: an electricity-quantity storage circuit stores in advance a reference electricity-quantity necessary for charging the secondary-battery from a first voltage to a second voltage; an electricity-quantity accumulation circuit measures an accumulative electricity-quantity necessary for charging the secondary-battery from the first voltage to the second voltage; and an internal short detection circuit compares the accumulative electricity-quantity measured by the electricity-quantity accumulation circuit and the reference electricity-quantity stored in the electricity-quantity storage circuit, if the accumulative electricity-quantity is larger than the reference electricity-quantity, then decides that an internal short is generated, and if the accumulative electricity-quantity is equal to, or smaller than, the reference electricity-quantity, then without deciding that an internal short is generated, rewrites the reference electricity-quantity stored in the electricity-quantity storage circuit into the accumulative electricity-quantity.

Internal short detection apparatus for secondary-battery, internal short detection method for secondary-battery, battery-pack, and electronic equipment

A rechargeable battery is integrated with a battery protection circuit that protects the rechargeable battery from overcharging, over discharging, and so forth. A circuit board () on which are formed a battery protection circuit, a positive input and output terminal (), and a temperature detection terminal () is disposed on a rechargeable battery () via a spacer (), and the positive and negative electrodes of the rechargeable battery () are connected to the circuit board (). This assembly is enveloped by a cover cap () and a cover plate (), such that the positive input and output terminal () and the temperature detection terminal () are exposed to the outside through openings provided in the cover plate (), and one end of the cover cap () in the same plane as these is used for connection as a negative input and output terminal ().

Rechargeable battery equipped with battery protection circuit

A rechargeable battery pack includes a rechargeable battery having a first electrode and a second electrode; a circuit assembly disposed at one end on a side of a sealing portion of the rechargeable battery; a battery protection circuit for protecting the rechargeable battery from overcharging, the battery protection circuit arranged on a side of the circuit assembly which faces the sealing portion of the rechargeable battery; a plurality of input and output terminals arranged on another side of the circuit assembly, said input and output terminals to which said first electrode and said second electrode are respectively each connected via the battery protection circuit, thereby constituting an intermediate unit in which the rechargeable battery and the circuit assembly are integrated; and an outer case for sealing therein said intermediate unit, the outer case having openings formed at locations corresponding to the input and output terminals.

A rechargeable battery is integrated with a battery protection circuit that protects the rechargeable battery from overcharging, overdischarging, and so forth. A circuit board ( ) on which are formed a battery protection circuit, a positive input and output terminal ( ), and a temperature detection terminal ( ) is disposed on a rechargeable battery ( ) via a spacer ( ), and the positive and negative electrodes of the rechargeable battery ( ) are connected to the circuit board ( ). This assembly is enveloped by a cover cap ( ) and a cover plate ( ), such that the positive input and output terminal ( ) and the temperature detection terminal ( ) are exposed to the outside through openings provided in the cover plate ( ), and one end of the cover cap ( ) in the same plane as these is used for connection as a negative input and output terminal ( ).

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Suita, Japan

Masaru Kawabe