Battery management apparatus
A battery management apparatus according to an embodiment of the present disclosure may manage a battery in consideration of mobility of lithium ions according to a temperature of the battery, and the present disclosure is directed to providing a battery management apparatus that may increase the temperature of a battery without control by a processing module when the temperature of the battery is lowered below a specific temperature. According to one aspect of the present disclosure, in an emergency situation when the temperature of the battery drops below a certain temperature, there is an advantage of allowing the battery to operate normally by heating the heating element to increase the temperature of the battery without going through a systemic process.
1 . A battery management apparatus, comprising:
a heating cell configured to be connected to a battery in parallel;
a first switch connected between the heating cell and a charging and discharging path for carrying a current for charging and discharging the battery, the first switch being configured to open and close a path between the charging and discharging path and the heating cell according to an operation state of the first switch;
a heating element connected to the heating cell in parallel and configured to increase a temperature of the battery by generating heat based on a current supplied from the heating cell;
a second switch connected between the heating element and the heating cell and configured to open and close a path connected between the heating element and the heating cell according to an operation state of the second switch; and
a heating controller connected to the charging and discharging path to receive a voltage of the battery as an input voltage, the heating controller being respectively connected to the first switch and the second switch and being configured to control the respective operation states of the first switch and the second switch according to the input voltage.
2 . The battery management apparatus according to claim 1 ,
wherein the heating controller is further configured to control the respective operation states of the first switch and the second switch differently.
3 . The battery management apparatus according to claim 1 ,
wherein the heating controller is further configured to generate a control signal corresponding to the input voltage, generate an inversion signal of the control signal, output the control signal to the first switch, and output the inversion signal to the second switch.
4 . The battery management apparatus according to claim 3 ,
wherein the heating element is configured to generate heat by the current supplied from the heating cell if the operation state of the first switch is controlled to a turn-off state and the operation state of the second switch is controlled to a turn-on state by the heating controller.
5 . The battery management apparatus according to claim 3 , further comprising:
a signal delay circuit connected between the heating controller and the second switch and configured to delay a time at which the inversion signal from the heating controller is input to the second switch.
6 . The battery management apparatus according to claim 5 ,
wherein the inversion signal is configured to be input to the second switch after the control signal is input to the first switch.
7 . The battery management apparatus according to claim 5 , wherein the signal delay circuit includes:
a resistor connected between the heating controller and the second switch; and
a capacitor having one end connected between the resistor and the second switch and the other end connected to the ground.
8 . The battery management apparatus according to claim 3 , wherein the heating controller includes:
a buffer having an input terminal and an output terminal, the buffer being configured to receive the voltage of the battery through the input terminal as the input voltage, generate the control signal having the same magnitude as the input voltage, and output the generated control signal through the output terminal; and
an inverter connected to the output terminal of the buffer to receive the control signal, the inverter being configured to generate the inversion signal of the input control signal and output the generated inversion signal to the second switch.
9 . The battery management apparatus according to claim 3 , wherein the heating controller includes:
a comparator having a first input terminal, a second input terminal, and an output terminal, the comparator being configured to receive the voltage of the battery through the first input terminal as the input voltage, receive a reference voltage through the second input terminal, compare the voltage of the battery and the reference voltage to generate a high-level signal or a low-level signal having a different signal level from the high level signal as the control signal, and output the generated control signal through the output terminal; and
an inverter connected to the output terminal of the comparator to receive the control signal, the inverter being configured to generate the inversion signal of the input control signal and output the generated inversion signal to the second switch.
10 . A battery pack, comprising the battery management apparatus according to claim 1 .
11 . The battery management apparatus according to claim 1 , further comprising:
a third switch connected between the first switch and the charging and discharging path based on an operation state of the third switch,
wherein the heating controller is further configured to control the operation state of the third switch based on the input voltage.
12 . The battery management apparatus according to claim 11 , wherein the third switch is a transistor with a drain terminal connected to the first switch, a source terminal connected to the charging and discharging path, and a gate terminal connected to the heating controller.