Apparatus for protection of secondary battery
View Patent ↗The present invention is an apparatus for protecting a secondary battery, in which, when the secondary battery such as a lithium-ion secondary battery is exposed to high temperature exceeding a working range due to a change in external environment, external impacts, and so on, or heated due to spontaneous generation of heat caused by internal defects, the secondary battery is discharged. The apparatus includes a thyristor or transistor having an anode and a cathode connected both terminals of the secondary battery respectively, and shorting both terminals of the secondary battery when gate current is supplied, and a temperature sensor detecting temperature of the secondary battery and supplying the gate current to the thyristor or transistor when the detected temperature is higher than predetermined temperature.
1. An apparatus for protecting a secondary battery, the apparatus consisting of:
a temperature sensor for detecting a temperature of the secondary battery and generating a control current when the detected temperature is higher than a predetermined temperature; and
a switching element for shorting an anode and a cathode of the secondary battery and forcibly discharging the secondary battery when the control current is supplied,
wherein the switching element consists essentially of a thyristor having a gate, an anode and a cathode, the anode and the cathode of the thyristor for connecting to the anode and the cathode of the secondary battery respectively,
wherein the temperature sensor consists essentially of a metal insulator transition (MIT) thermistor, one end of which for connecting directly to the cathode of the secondary battery, and another end of which is connected directly to the gate of the thyristor,
wherein the MIT thermistor supplies a control current from the secondary battery to the gate of the thyristor when heat generated by the secondary battery at a predetermined temperature lowers a resistance value of the MIT thermistor to a predetermined resistance value
wherein the thyristor shorts the anode and the cathode of the secondary battery when the control current is supplied to the gate of the thyristor.
2. The apparatus according to claim 1 , wherein the thyristor includes any one of a silicon controlled rectifier (SCR), an N-type thyristor, a dual gate thyristor, a bidirectional thyristor (TRIAC), and a gate turn off (GTO) thyristor.
3. A secondary battery including the apparatus according to claim 1 .
4. The secondary battery according to claim 3 , wherein the thyristor includes any one of a silicon controlled rectifier (SCR), an N-type thyristor, a dual gate thyristor, a bidirectional thyristor (TRIAC), and a gate turn off (GTO) thyristor.
5. An apparatus for protecting a secondary battery, the apparatus consisting of:
a temperature sensor for detecting a temperature of the secondary battery and generating a control current when the detected temperature is higher than a predetermined temperature; and
a switching element for shorting an anode of a cathode of the secondary battery and forcibly discharging the secondary battery when the control current is supplied,
wherein the switching element consisting essentially of a thyristor having a gate, an anode and a cathode, the anode and cathode of the thyristor for connecting to the anode and the cathode of the secondary battery,
wherein the temperature sensor consisting essentially of a metal insulator transition (MIT) thermistor, one end of which is for connecting directly to the cathode of the secondary battery, and another end of which is connected directly to the gate of the thyristor, wherein a resistance value of the MIT thermistor decreases at least one order of magnitude between a temperature ranging from 60 to 70° C.,
wherein the MIT thermistor supplies a control current from the secondary battery to the gate when heat generated by the secondary battery at a predetermined temperature lowers the resistance value of the MIT thermistor to a predetermined resistance value, and
wherein the thyristor shorts the anode and the cathode of the secondary battery when the control current is supplied to the gate of the thyristor.
6. An apparatus for protecting a secondary battery, the apparatus consisting of:
a temperature sensor for detecting a temperature of the secondary battery and generating a control current when the detected temperature is higher than a predetermined temperature; and
a switching element for shorting an anode and a cathode of the secondary battery and forcibly discharging the secondary battery when the control current is supplied,
wherein the switching element consists essentially of a thyristor having a gate, an anode and a cathode, the anode and the cathode of the thyristor for connecting to the anode and the cathode of the secondary battery respectively,
wherein the temperature sensor consists essentially of a thermistor, one end of which for connecting directly to the cathode of the secondary battery, and another end of which is connected directly to the gate of the thyristor,
wherein the thermistor supplies a control current from the secondary battery to the gate of the thyristor when heat generated by the secondary battery at a predetermined temperature lowers a resistance value of the thermistor to a predetermined resistance value, and
wherein the thyristor shorts the anode and the cathode of the secondary battery when the control current is supplied to the gate of the thyristor.
7. The apparatus according to claim 6 , wherein the thermistor includes any one of a negative temperature coefficient (NTC) thermistor and a metal insulator transition (MIT) thermistor.
8. The apparatus according to claim 6 , wherein the thyristor includes any one of a silicon controlled rectifier (SCR), anN-type thyristor, a dual gate thyristor, a bidirectional thyristor (TRIAC), and a gate turn off (GTO) thyristor.