| 摘要 |
A battery unit includes at least one storage cell, two external connecting terminals, one of which is positive and the other of which is negative, and a safety circuit connected to prohibit entry of charging current into the cell as soon as a voltage applied between the external connecting terminals is greater than a particular maximum safety voltage. An additional protection circuit is connected between the external terminals and the safety circuit to prohibit the entry of charging current into the safety circuit as soon as the voltage applied between the external connecting terminals is greater than a particular maximum charging voltage which is less than the maximum safety voltage. This prevents the safety circuit operating unnecessarily.
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