Panasonic Corporation

Jun Asakura

Masato Fujikawa

Hajime Nishino

Takuya Nakashima

Hiroshi Takasaki

Shunsuke Yasui

Toshiyuki Nakatsuji

Shin-Ichi Yuasa

Yoshio Nakatani

A battery system includes a battery module that has a plurality of batteries which are provided with release portions each for releasing internal gas when an internal pressure is increased, and an exhaust portion which is provided with an opening portion and guides gas released from the release portions to the opening portion, a non-resettable switch element which is provided at a position where the guided gas passes in a vicinity of the opening portion, and is changed from a first state preset as one of an opened state and a closed state into a second state as the other one of the opened state and the closed state when a preset reference temperature or higher is reached, and a high-temperature abnormality determination unit which determines that the battery module has an abnormality when the switch element is in the second state.

Battery system

It is intended to provide a battery module having a long life by designing such that deterioration proceeds evenly among battery cells. Disclosed is a battery module including a plurality of battery groups being connected in series and each comprising a plurality of battery cells connected in parallel, wherein: a positive electrode terminal and a negative electrode terminal are provided; the battery groups are connected to each other by a plurality of electrically conductive strips; and an electrical resistance value of the conductive strip arranged at a position near a virtual line drawn between the positive electrode terminal and the negative electrode terminal is high, and an electrical resistance value of the conductive strip arranged at a position other than the position near the virtual line is low, the electrical resistance value being measured in a direction of charge and discharge current flow.

Battery module

A battery internal short-circuit detection apparatus includes: a voltage detection unit for detecting a terminal voltage of the battery; a current detection unit for detecting a discharging current of the battery; a voltage drop and recovery detection unit for detecting a momentary voltage drop of the battery and a recovery from the voltage drop, in response to a result of detection performed by the voltage detection unit; and a determination unit for determining that an internal short circuit has occurred, when a maximum value of the discharging current detected by the current detection unit between the voltage drop and the recovery is equal to or lower than a threshold current.

Battery internal short-circuit detection apparatus and method, and battery pack

A charging system is provided with a secondary battery, a charging current supplier for supplying a charging current to the secondary battery, an internal resistance detector for detecting the resistance value of the internal resistance of the secondary battery, and a charge controller for increasing the charging current to be supplied to the secondary battery by the charging current supplier as the resistance value detected by the internal resistance detector decreases.

Charging system, charging device and battery pack

A positional relation sensing section () of a control section () senses the relative position relation between first and second cabinets (and) based on output of magnetic sensing elements (and) and outputs a position determination signal (S). If the state is 'transition state' in which one cabinet slides and moves based on the position determination signal (S), a voice control section () outputs a mute control signal (S) to a voice processing section () as a muting instruction. Accordingly, all outputs of voice signals collected by a microphone () to a receiver (), a loudspeaker (), a wireless communication section (), a short-range wireless communication section (), and a voice output terminal () are stopped.

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Osaka, Japan

Jun Asakura