Abstract: The present disclosure discloses a battery fuel gauging system, which includes a battery voltage collecting module and a microprocessor module. An input terminal of the battery voltage collecting module is configured to collect a terminal voltage of the battery. The microprocessor module is configured to receive the terminal voltage and estimate the remaining charge in the battery. The microprocessor module estimates an open-circuit voltage of the battery according to the terminal voltage of the battery and a built-in battery model, and further calculates the battery's remaining charge based on SOC-OCV relations of a typical lithium-ion battery. The present disclosure is capable of maintaining the precision of the battery fuel gauging system and can set the battery fuel gauging system inside or outside of the battery.

Abstract: The present disclosure discloses a battery equalizing circuit, which comprises a first battery unit, a second battery unit, a current detecting resistor, an equalizing inductor, a first control switch, a second control switch and a feedback control circuit. The first battery unit is connected in series with the second battery unit. The first battery unit, the current detecting resistor, the equalizing inductor and the first control switch are electrically connected with each other to form a first circuit loop. The second battery unit, the current detecting resistor, the equalizing inductor and the second control switch are electrically connected with each other to form a second circuit loop. The feedback control circuit is connected in parallel with the current detecting resistor to detect a voltage drop across the current detecting resistor, and switch between the first and the second circuit loop so as to make an equalizing current substantially constant.

Abstract: The present disclosure discloses a battery fuel gauging system, which includes a battery voltage collecting module and a microprocessor module. An input terminal of the battery voltage collecting module is configured to collect a terminal voltage of the battery. The microprocessor module is configured to receive the terminal voltage and estimate the remaining charge in the battery. The microprocessor module estimates an open-circuit voltage of the battery according to the terminal voltage of the battery and a built-in battery model, and further calculates the battery's remaining charge based on SOC-OCV relations of a typical lithium-ion battery. The present disclosure is capable of maintaining the precision of the battery fuel gauging system and can set the battery fuel gauging system inside or outside of the battery.

Abstract: The present disclosure discloses a battery protection circuit and a method thereof for protecting a battery pack. The battery protection circuit comprises a hardware protection circuit, a software protection circuit and a current detecting circuit. When the battery pack is not in the active status, the hardware protection circuit is used to execute a protective operation; and when the battery pack is in the active status, the software protection circuit is used to execute the protective operation. Furthermore, the hardware protection circuit is electrically connected to the software protection circuit to detect a status of the software protection circuit. When the battery pack is in the active status, the software protection circuit is used to execute the protective operation, and when the software protection circuit is in an abnormal status, the hardware protection circuit is used instead to execute the protective operation.

Abstract: The present disclosure discloses a battery equalizing circuit, which comprises a first battery unit, a second battery unit, a current detecting resistor, an equalizing inductor, a first control switch, a second control switch and a feedback control circuit. The first battery unit is connected in series with the second battery unit. The first battery unit, the current detecting resistor, the equalizing inductor and the first control switch are electrically connected with each other to form a first circuit loop. The second battery unit, the current detecting resistor, the equalizing inductor and the second control switch are electrically connected with each other to form a second circuit loop. The feedback control circuit is connected in parallel with the current detecting resistor to detect a voltage drop across the current detecting resistor, and switch between the first and the second circuit loop so as to make an equalizing current substantially constant.

Abstract: The present disclosure discloses a battery protection circuit and a method thereof for protecting a battery pack. The battery protection circuit comprises a hardware protection circuit, a software protection circuit and a current detecting circuit. When the battery pack is not in the active status, the hardware protection circuit is used to execute a protective operation; and when the battery pack is in the active status, the software protection circuit is used to execute the protective operation. Furthermore, the hardware protection circuit is electrically connected to the software protection circuit to detect a status of the software protection circuit. When the battery pack is in the active status, the software protection circuit is used to execute the protective operation, and when the software protection circuit is in an abnormal status, the hardware protection circuit is used instead to execute the protective operation.