Secondary battery protection device from overcharge/overdischarge
    3.
    发明授权
    Secondary battery protection device from overcharge/overdischarge 失效
    二次电池保护装置过充电/过放电

    公开(公告)号:US5896025A

    公开(公告)日:1999-04-20

    申请号:US777965

    申请日:1996-12-24

    CPC classification number: H02J7/0031

    Abstract: A protection circuit device for protecting a secondary battery from an overcharge and/or an overdischarge has first and second terminals, across which a charger and a load are alternatively connectable. A first switch and/or a second switch may be provided in series with the secondary battery between the first and second terminals. In a charging operation mode, the second switch is kept conductive. A charging operation is performed with the first switch made conductive. When the battery is overcharged for some reasons, the first switch is turned off. Upon connection of a load across the first and second terminals, the first switch is restored to a conductive state for a discharging operation which releases the battery from an overdischarge state. In a discharging operation mode, the first switch is kept conductive. A discharge operation is performed with the second switch made conductive. When the battery is overdischarged, the second switch is caused to remain conductive even after commencement of the overdischarge, so that the battery can continue the discharge operation if the temporary overdischarge does not last longer than the predetermined period of time.

    Abstract translation: 用于保护二次电池免受过充电和/或过放电的保护电路装置具有第一和第二端子,充电器和负载可交替地连接在该端子上。 可以在第一和第二端子之间与二次电池串联地提供第一开关和/或第二开关。 在充电操作模式中,第二开关保持导通。 在第一开关导通的情况下执行充电操作。 当电池由于某些原因过充电时,第一个开关关闭。 当跨越第一和第二端子的负载连接时,第一开关被恢复到用于使电池从过放电状态释放的放电操作的导通状态。 在放电操作模式中,第一开关保持导通。 在第二开关导通时执行放电操作。 当电池过度放电时,即使在过放电开始之后,第二开关也保持导通,使得如果临时过放电持续时间比预定时间长,电池可以继续放电操作。

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