Power supply device and vehicle provided with the same

A power supply device and circuit technology, applied in circuit devices, battery circuit devices, electric vehicles, etc., can solve problems such as hindering normal operation and reducing reliability.
CN102104261AInactive Publication Date: 2011-06-22SANYO ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SANYO ELECTRIC CO LTD
Publication Date
2011-06-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

A power supply device is provided that includes a battery pack 10, and forcedly discharging circuits 20. The battery pack 10 includes serially-connected rechargeable battery cells 2. The forcedly discharging circuits 20 are connected to the battery cells 2 in parallel so that, when a cell voltage of a battery cell is becomes higher than a predetermined voltage, this battery cell is forcedly discharged. The forcedly discharging circuits 20 are composed of analog circuits. When a cell voltage of a battery cell exceeds the predetermined voltage, the forcedly discharging circuits discharge this battery cell. Since forcedly discharging circuit 20 is not composed of controlling software but is physically composed of an analog circuit, the forcedly discharging circuit can stably operate without malfunction caused by noise. A power supply device can be provided that includes a protection circuit with improved reliability. Therefore, the power supply device of the invention can avoid noise influence and avoid accident that the voltage of the battery cell becomes abnormally high.
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Description

technical field

[0001] The present invention relates to a power supply device used in a vehicle or the like in which a plurality of battery cells are connected in series to increase an output voltage, and a vehicle including the power supply device. Background technique

[0002] In a large-output power supply device used in a vehicle, etc., a plurality of battery cells are connected in series to increase the voltage. The power supply device charges the series-connected battery cells with the same charging current, and discharges them with the same current. Therefore, as long as all battery cells are the exact same characteristics, there will be no imbalance in battery voltage or remaining capacity. However, in reality, it is impossible to manufacture battery cells with exactly the same characteristics. When charging and discharging are repeated, the unbalance of the battery cells becomes the unbalance of voltage or remaining capacity. Furthermore, the imbalance of the bat...

Claims

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