Abstract: The present disclosure relates to a cell balancing control method and battery system providing the same. The battery system includes: a battery including a plurality of battery cells; a battery management system (BMS) for determining whether a predetermined sleep mode entering condition is satisfied, entering the sleep mode when the sleep mode entering condition is satisfied, and waking up for each predetermined wakeup period in the sleep mode state to determine whether to perform cell balancing; and a timer synchronized with a time when the BMS sleeps and counting a first wakeup time, and a power supply unit for supplying a driving voltage to the BMS when the count result reaches the first wakeup time.

Abstract: Provided is an insulation resistance measuring device for measuring a positive insulation resistor disposed between a positive electrode of a battery pack and a ground and a negative insulation resistor disposed between the ground and a negative electrode of the battery pack, the insulation resistance measuring device including: first and second resistors connected in series between the positive electrode of the battery pack and the ground; third and fourth resistors connected in series between the ground and the negative electrode of the battery pack; an output terminal connected between the third and fourth resistors; and a switch connected between a contact between the first and second resistors and the negative electrode of the battery pack.

Abstract: A diagnosis apparatus includes a vehicle including a battery and a BMS connected to the vehicle. The vehicle is configured to generate a signal having a predetermined period and a predetermined width, and the BMS is configured to diagnose a communication state between the vehicle and the BMS and a state of the battery based on the signal, and to determine the communication state and the state of the battery as a normal state when a period of the signal is the same as a reference period and a width of the signal is the same as a reference width.

Abstract: A relay control apparatus and method is capable of retaining the operation state of a plurality of relays even when a processor is reset due to a system error. Therefore, the relay control apparatus and method has an advantage of preventing an accident caused by the reset of the processor since the operation state of a plurality of relays is maintained even when the processor is reset. In addition, if the operation state of the processor is a reset state even after a predetermined time passes, the operation state of the plurality of relays is changed to a turn-off state, and thus there is an advantage of preventing system resources and energy from being wasted.

Abstract: An overdischarge preventing apparatus for preventing a battery pack provided in a vehicle from being overdischarged includes a sensor configured to measure a voltage of a main battery provided in the battery pack according to an operation mode; and a controller configured to determine an operation state of a charging and discharging relay connected to the main battery, and control the operation mode of the sensor based on at least one of the determined operation state of the charging and discharging relay, information as to whether the vehicle is stopped, and the voltage of the main battery measured by the sensor.

Abstract: A battery management apparatus according to an embodiment of the present disclosure includes a converter unit electrically connected to a first node between a battery and a first end of a positive electrode relay connected in series to the battery and for converting a voltage of the battery into a predetermined voltage and outputting the predetermined voltage based on an operation mode; and a converter driving unit connected to the first node to receive the battery voltage from the battery and for controlling the operation mode of the converter unit based on the battery voltage to a shutdown mode in which the converter unit is inactivated or a wakeup mode in which the converter unit is activated.

Abstract: A relay control apparatus and method for retaining a relay in a closed state even though a system error occurs to reset the processor. Therefore, the relay control apparatus and method prevents an accident caused by the reset of the processor since the operation state of a plurality of relays is maintained even when the processor is reset. In addition, if the operation state of the processor is a reset state even after a predetermined time passes, the operation state of the plurality of relays is changed to a turn-off state, and system resources and energy are prevented from being wasted. In addition, when the operation state of the processor is recovered, the operation state of the plurality of relays may be controlled by the processor.

Abstract: The present disclosure relates to a battery pack diagnosing apparatus and method, and more particularly, to a battery pack diagnosing apparatus and method capable of diagnosing a state of a battery pack. According to one aspect of the present disclosure, the battery pack diagnosing apparatus has an advantage of diagnosing the state of the battery pack in consideration of the arrangement information of the plurality of battery modules, without simply diagnosing the state of the battery pack based on the temperature of each battery module provided in the battery pack.

Abstract: A battery management apparatus according to an embodiment of the present disclosure includes a converter unit electrically connected to a node between a battery and one end of a positive electrode relay connected in series to the battery and for converting a voltage of the battery into a predetermined voltage and output the predetermined voltage based on an operation mode; and a converter driving unit connected to the node to receive the battery voltage from the battery and for controlling the operation mode of the converter unit to a shutdown mode in which the converter unit is inactivated or a wakeup mode in which the battery voltage is applied as a driving power to activate the converter unit according to whether a converter driving signal is input from the outside.

Abstract: A relay control apparatus and method for retaining a relay in a closed state even though a system error occurs to reset the processor. Therefore, the relay control apparatus and method prevents an accident caused by the reset of the processor since the operation state of a plurality of relays is maintained even when the processor is reset. In addition, if the operation state of the processor is a reset state even after a predetermined time passes, the operation state of the plurality of relays is changed to a turn-off state, and system resources and energy are prevented from being wasted. In addition, when the operation state of the processor is recovered, the operation state of the plurality of relays may be controlled by the processor.

Abstract: An apparatus and method for diagnosing an insulation resistance measurement circuit, and more particularly an insulation resistance measurement circuit of a battery cell or a battery module. When diagnosing the state of the insulation resistance measurement circuit, since the voltage ratio based on the measured voltage value of the battery module and the estimated voltage value is used, there is an advantage that the state of the insulation resistance measurement circuit may be diagnosed more diversely and accurately.

Abstract: A relay control apparatus and method is capable of retaining the operation state of a plurality of relays even when a processor is reset due to a system error. Therefore, the relay control apparatus and method has an advantage of preventing an accident caused by the reset of the processor since the operation state of a plurality of relays is maintained even when the processor is reset. In addition, if the operation state of the processor is a reset state even after a predetermined time passes, the operation state of the plurality of relays is changed to a turn-off state, and thus there is an advantage of preventing system resources and energy from being wasted.

Abstract: A battery control apparatus includes: an MCU including a first control terminal, a first sensing terminal connected to a first node, a second control terminal, a third control terminal, a second sensing terminal connected to a second node, and a fourth control terminal; a relay including a switch and a coil connected between the first node and the second node; and a first reduction circuit including a first transistor having a first gate connected to the first control terminal and a first end connected to the first node, and a second transistor having a second gate connected to the second control terminal and the MCU controls the first gate and the second gate to respectively allow the first transistor to be turned on and the second transistor to be turned off when there is no voltage change of the first node.

Abstract: A diagnosis apparatus includes a vehicle including a battery and a BMS connected to the vehicle. The vehicle is configured to generate a signal having a predetermined period and a predetermined width, and the BMS is configured to diagnose a communication state between the vehicle and the BMS and a state of the battery based on the signal, and to determine the communication state and the state of the battery as a normal state when a period of the signal is the same as a reference period and a width of the signal is the same as a reference width.

Abstract: A battery control apparatus includes: an MCU including a first control terminal, a first sensing terminal connected to a first node, a second control terminal, a third control terminal, a second sensing terminal connected to a second node, and a fourth control terminal; a relay including a switch and a coil connected between the first node and the second node; and a first reduction circuit including a first transistor having a first gate connected to the first control terminal and a first end connected to the first node, and a second transistor having a second gate connected to the second control terminal and the MCU controls the first gate and the second gate to respectively allow the first transistor to be turned on and the second transistor to be turned off when there is no voltage change of the first node.