Short-circuit detecting apparatus and method of heating system for high voltage battery
View Patent ↗A short-circuit detecting apparatus and method of a heating system for a high voltage battery that includes a plurality of heaters, a short-circuited detection resistor, an A/D converter, and a Battery Management System (BMS). The plurality of heaters are connected to a high voltage battery to heat the high voltage battery. The short-circuit detection resistor is connected between the heaters to detect whether the heaters are short-circuited. The A/D converter is configured to sense a voltage applied across the short-circuit detection resistor. The BMS is configured to calculate a final operation value using the voltage applied across the short-circuit detection resistor and compare the final operation value with the value of battery pack voltage to detect whether the heaters are short-circuited.
1. A short-circuit detecting apparatus of a heating system for a high voltage battery, the apparatus comprising:
a plurality of heaters connected to a high voltage battery and configured to heat the high voltage battery;
a short-circuit detection resistor connected between the heaters and configured to detect whether the heaters are short-circuited;
an analog-to-digital (A/D) converter configured to sense a voltage applied across the short-circuit detection resistor; and
a Battery Management System (BMS) configured to calculate a final operation value using the voltage applied across the short-circuit detection resistor and compare the final operation value with the value of battery pack voltage to detect whether the heaters are short-circuited.
2. A short-circuit detecting method of a heating system for a high voltage battery, the method comprising:
sensing, by an analog-to-digital (A/D) converter, a voltage applied across a short-circuit detection resistor connected in series between heaters of the heating system for the high voltage battery;
calculating, by a controller, a final operation value according to Equation (1) below after receiving a signal from the A/D converter;
comparing, by the controller, the final operation value with a predetermined battery pack voltage;
determining, by the controller, an absence of a short-circuit when the final operation value is smaller than the battery pack voltage; and
determining, by the controller, that the short-circuit occurs in the heater when the final operation value is equal to or greater than the battery pack voltage,
wherein Equation (1) is expressed as
short
-
circuit
detection
R
total
resistance
+
short
-
circuit
detection
R
×
Vpack
×
100
=
final
operation
value
(
1
)
wherein, Vpack is the battery pack voltage source, and short-circuit R is the short-circuit detection resistor.
3. The method of claim 2 , wherein when the short-circuit occurs, a cell voltage deviation due to battery cell characteristics is prevented by applying a control algorithm that turns off a heating control relay.
4. A non-transitory computer readable medium containing program instructions executed by a processor or controller, the computer readable medium comprising:
program instructions that control an analog-to-digital (A/D) converter to sense a voltage applied across a short-circuit detection resistor connected in series between heaters of the heating system for the high voltage battery;
program instructions that calculate a final operation value according to Equation (1) below after receiving a signal from the A/D converter;
program instructions that compare the final operation value with a predetermined battery pack voltage;
program instructions that determine an absence of a short-circuit when the final operation value is smaller than the battery pack voltage; and
program instructions that determine that the short-circuit occurs in the heater when the final operation value is equal to or greater than the battery pack voltage,
wherein Equation (1) is expressed as
short
-
circuit
detection
R
total
resistance
+
short
-
circuit
detection
R
×
Vpack
×
100
=
final
operation
value
(
1
)
wherein, Vpack is the battery pack voltage source, and short-circuit R is the short-circuit detection resistor.
5. The non-transitory computer readable medium of claim 4 , further comprising:
program instructions that apply a control algorithm that turns off a heating control relay when the short-circuit occurs to prevent a cell voltage deviation due to battery cell characteristics.