System for preventing overdischarge of automobile starting battery and control method thereof

The invention discloses a system for preventing overdischarge of automobile starting battery, comprising a starting battery, a generator and a starting load; the system for preventing overdischarge of automobile starting battery is provided with an overdischarge control unit, and the overdischarge control unit is respectively connected with the starting battery, the generator and the starting load by a signal circuit. The invention also discloses a control method of the system. By adopting the technical scheme, monitoring on automobile starting battery terminal voltage, batter charging current and discharging current and battery working temperature is utilized to judge the actual charge state of the battery and compare the actual electricity quantity with rated electricity quantity, so asto judge whether the battery is overdischarged or not, and corresponding steps are taken like compensate electric quantity charging, the battery is avoided to overdischarge, the battery is ensured tooperate normally, and further safety performance of automobile is improved.