| 摘要 |
A secondary battery needs to be protected by an inexpensive structure having a small number of components. To this end, the structure includes a fuse 41 with a heater, connected to a positive electrode side of a battery cell 2, as a secondary battery, a driving FET 42 for driving the heater of the fuse 41 and a detection control IC 3 which, on detecting at least the over-charging state of the battery cell 2, drives the driving FET 42 to fuse the heater of the fuse 41.
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