| 摘要 |
An apparatus for preventing battery overcharge according to the present invention comprises: a voltage division unit having one end connected to a positive tap of a battery and the other end connected to a negative tap of the battery; and a switching unit having one end connected to the positive tap and the other end connected to the negative tap, the switching unit being shorted or opened according to a voltage divided from the voltage division unit. When a voltage between the positive tap and the negative tap is larger than or equal to a first voltage, the switching unit is shorted, the battery is shorted, an overcurrent is generated, the positive tap is destroyed, and the battery is electrically separated from a charging power source. The apparatus uses only passive devices, which makes it unnecessary to add a function for preventing an overcharge to a control unit, and has a simple construction enough to be added to a sensing circuit of a battery cell. When the overcharge is generated, the battery can be further secured by blocking a voltage applied to the battery cell within a battery module, and the overcharge can be prevented by detecting an overvoltage. Further, when the overvoltage is generated due to the detection of an unexpected battery voltage or an inevitable condition, it is possible to prevent the battery from reaching a dangerous state by blocking the voltage applied to the battery. |
