Second battery control circuit
View Patent ↗According to the present invention, there is provided a secondary battery control circuit which can perform a reliable charge/discharge control without activating Positive Temperature Coefficient element. The secondary battery control circuit includes a temperature detection section for detecting a temperature of the secondary battery and a system logic for controlling charging/discharging of the secondary battery based on the temperature detected by the temperature detection section. The system logic interrupts the charging of the secondary battery in a case where the temperature detected by the temperature detection section is out of a predetermined first temperature range, and interrupts the discharging of the secondary battery in a case where the temperature detected by the temperature detection section is out of a predetermined second temperature range.
1. A secondary battery control circuit comprising:
a voltage detection section for detecting a voltage of a secondary battery;
a temperature detection section for detecting a temperature of the secondary battery; and
a control section for controlling charging/discharging of the secondary battery based on a voltage detected by the voltage detection section and a temperature detected by the temperature detection section, wherein
in a case where the voltage detected by the voltage detection section is equal to or greater than a predetermined first voltage value, and the temperature detected by the temperature detection section is equal to or greater than a predetermined temperature, the control section discharges the secondary battery until the voltage of the secondary battery reaches a predetermined second voltage value.
2. A secondary battery control circuit according to claim 1 , wherein the predetermined first voltage value and the predetermined second voltage value are detected by a single circuit having a hysteresis.
3. A secondary battery control circuit according to claim 1 , wherein either the predetermined first voltage value or the predetermined second voltage value is equal to an overcharge releasing voltage value.
4. A secondary battery control circuit according to claim 1 , wherein a discharge canceling condition for the secondary battery includes a temperature condition for the secondary battery.
5. A secondary battery control circuit according to claim 1 , wherein the secondary battery control circuit is formed on a single semiconductor chip.
6. A secondary battery control circuit according to claim 5 , wherein the single semiconductor chip is enclosed in a sealing section of the secondary battery.