Abstract: A power supply apparatus is disclosed. The power supply apparatus includes a rechargeable battery and a battery management system (BMS) for managing charging and discharging of the battery. The power supply apparatus is configured to supply an operating power to the BMS from an external power of an external power source when the external power source is in a normal state and is capable of supplying the external power to a load through the power supply apparatus. The power supply apparatus is further configured to supply the operating power to the BMS from electric energy stored in the battery when the external power source is in a state different from the normal state and not capable of supplying the external power to the load through the power supply apparatus.

Abstract: A battery pack is disclosed. The battery pack has an analog front end which senses if a failure occurs in a microcontroller, and interrupts charging and discharging of the battery in response to the failure.

Abstract: Battery management system and a driving method thereof including a sensing unit and an MCU. The sensing unit measures a battery current and a battery voltage. The MCU sets an OCV during a no-load state period at time increments measured from the beginning of the no-load state period, and estimates an SOC corresponding to the set OCV.

Abstract: A battery management system and a driving method thereof to manage a battery including a plurality of cells. The battery management system includes a sensing unit, an MCU, and a cell balancing unit. The sensing unit measures cell voltages of the plurality of cells. The MCU detects cells requiring cell balancing according to the plurality of measured cell voltages and generates a plurality of cell voltage signals to control the cell balancing of the detected cells. The cell balancing unit balances the cells according to the plurality of cell voltage signals, and the number of the cell voltage signals is fewer than the number of cells. The cell balancing unit generates a plurality of cell balancing signals corresponding to each of the plurality of cell voltage signals, and at least one of the cell voltage signals balances at least two of cells in the battery.

Abstract: A battery pack is constructed with a plurality of secondary batteries or a plurality of battery assemblies, each having a plurality of unit batteries, and at least one safety switch, which can facilitate precise measurement of the voltages of the plurality of secondary batteries or battery assemblies. The battery pack is constructed with a plurality of secondary batteries, at least one safety switch electrically connected between two adjacent batteries among the plurality of secondary batteries, and a plurality of sensing lines for measuring voltages of the plurality of secondary batteries. The quantity of the sensing lines is equals to a sum of the number of the secondary batteries, and the number of the safety switches, and plus one.

Abstract: A battery management system using a measurement model modeling a battery, and estimating a SOC (state-of-charge) of the battery, and a battery driving method thereof. The battery management system is constructed with a sensor, a predictor, a data rejection unit, and a measurement unit. The sensor senses a charging and discharging current flowing through the battery, a temperature of the battery, a terminal voltage of the battery. The predictor counts the charging and discharging current, and estimates the state-of-charge of the battery. The data rejection unit generates information associated with an error generated from the measurement model, as a function of at least one of the battery temperature, the charging and discharging current, the state-of-charge, and a dynamic of the charging and discharging current. The measurement unit corrects the estimated state-of-charge of the battery, using the measurement model and the information associated with the error.

Abstract: A battery management system is provided. A voltage of a first battery cell is charged to a capacitor. Then, the voltage of the capacitor is measured, the measured voltage being the voltage of the first battery cell. Subsequently, a voltage of a second battery cell is again charged to the capacitor while the capacitor holds the voltage of the first battery cell. The voltage of the capacitor is then measured, the measured voltage being the voltage of the second battery cell. With such a scheme, the time for discharging the capacitor may be removed, and accordingly, a period for measuring a voltage of the battery cell may become shorter.

Abstract: A state of charge (SOC) compensation method of a battery and a battery management system using the same. A charge/discharge current of the battery is used for calculating the SOC and an SOC voltage that is a value in an OCV table, a rheobasic voltage is calculated, an error in the SOC is measured by using a difference between the SOC voltage and the rheobasic voltage, and a range of the error is determined among multiple effective ranges. Subsequently, the SOC is compensated by using a compensation SOC set in correspondence with a range in which the error is included to thereby measure a more accurate SOC of the battery.

Abstract: A protection circuit of a battery pack capable of detecting the error of a charging device from the battery pack. The protection circuit of the battery pack having a battery cell charged by a charging device, the protection circuit including a charge switch coupled to a high current path (HCP), the charge switch disposed between the battery cell and the charging device charging the battery cell and a controller sensing a voltage or a current of the charging device during a charge stop period stopping a charging of the battery cell and determining whether an error of the charging device occurs according to the voltage or the current of the charging device.

Abstract: A secondary battery includes a protection circuit module (PCM) electrically connected to a bare cell. The bare cell is wrapped with a first sheet, a water permeable second sheet placed on the first sheet, and a submergence label placed between the first sheet and the water permeable second sheet. The submergence label indicates if the bare cell has been exposed to moisture. The label sheet further has a stacking structure, wherein the second sheet is placed on top of the first sheet and the submergence label is interposed between the first sheet and the second sheet. Accordingly, it is possible to determine whether a user has disassembled, modified, or reused the battery and it is possible to easily verify whether or not the secondary battery has been submerged in a liquid due to a user's carelessness or mistake.

Abstract: A battery pack having a function for preventing operation of the battery pack when an abnormal replacement of a battery cell is detected or preventing a use of the battery pack in which a cap has been removed. The battery pack generates an encryption code and writes the encryption code to data flash when a battery cell is normally discharged according to a first voltage, and if an abnormal power-on reset is detected on the battery cell, the battery pack may check the stored encryption code to a second encryption code generated upon power-on reset. If the codes do not match, firmware of the battery pack is deleted and/or a fuse is blown, making it is possible to prevent the battery pack from being re-used when the battery cell has been replaced or in which a cap has been removed.

Abstract: The battery management system (BMS) measures a state of charge (SOC) of a battery by using a total amount of charge corresponding to a total amount of discharge accumulation. The BMS, outputting a SOC of a battery to an engine control unit (ECU), includes a sensor, state of health (SOH) and SOC measurers, a total amount of charge (TAC) determiner, and an output unit. The sensor detects a pack current and a pack voltage of the battery. The SOH measurer outputs a SOH of the battery by using the pack current and voltage. The SOC measurer measures a SOC of the battery by using the pack current and a TAC of the battery. The TAC determiner accumulates a total amount of discharge accumulation by using the pack current, determines a TAC corresponding to the total amount of discharge accumulation, and delivers the determined TAC to the SOC measurer. The output unit outputs the SOC and SOH to the ECU.

Abstract: A battery management system for managing a battery including a plurality of battery cells and a driving method are provided. The system includes a sensor, and a main control unit (MCU). The sensor senses a voltage and a current of the battery. The MCU receives the voltage and the current of the battery, measures an open circuit voltage (OCV) in key-on using the battery voltage, and estimates an initial SOC depending on the OCV in the key-on. The MCU divides the OCV into first and second OCV regions, and, when the OCV in the key-on is in the first OCV region, estimates the initial SOC using a linear equation.

Abstract: The battery management system of the present invention measures a cell voltage of a battery more efficiently using a small number of elements, and measures a pack current and voltage thereof when measuring the voltages of a plurality of cells. The battery management system is coupled to the battery formed with one pack having a plurality of battery cells. The battery includes a first sub-pack having first and second batteries among the plurality of battery cells. The battery management system includes first to fourth relays and an A/D converter. The first and the second relays transmit the cell voltages in response to respective first and second control signals by being coupled to each output terminal of the first and second battery cells of the first sub-pack. The third relay transmits the cell voltage transmitted though one of the first and second relays in response to a third control signal, and the first charging unit stores the cell voltage transmitted from the third relay.

Abstract: A battery management system that estimates an internal impedance of a battery, a method of driving the same, a device that estimates an internal impedance of a battery, and a method of estimating the internal impedance of a battery. A method of driving a battery management system that estimates the internal impedance of a battery including a plurality of cells includes generating a battery equivalent model of the battery, receiving a terminal voltage signal and a charge and discharge current signal of the battery, and generating a first discrete signal corresponding to the terminal voltage signal of the battery and a second discrete signal corresponding to the charge and discharge current signal of the battery, and filtering the first discrete signal and the second discrete signal according to a frequency range corresponding to the battery equivalent model so as to estimate the internal impedance of the battery.

Abstract: A control signal generating circuit used in a battery management system may stably generate a control signal. The control signal generating circuit includes a first signal line transmitting a first control signal having an on-level or an off-level, a second signal line transmitting a second control signal having an on-level or an off-level, and a third signal line transmitting a third control signal having an on-level or an off-level. In addition, the control signal generating circuit includes a transistor including a first electrode coupled to the first signal line and a second electrode applied with the off-level. The transistor electrically connects the first and second electrodes and converts the first control signal into a fourth control signal by being turned on based on the second and third control signals.

Abstract: A battery management system and a method of operating the same includes a plurality of battery cells constituting one pack and connected to a battery having at least one pack, and determines an estimated state of charge (SOC) of the battery. The battery management system determines whether or not a pack current flows, and controls a reset of an SOC depending on the determination result. The battery management system sets an OCV idle period associated with a temperature of the battery, and compares the idle period with a time for which the current of the battery does not flow, and sets the reset OCV depending on the comparison result. The battery management system resets the estimated SOC as the reset SOC associated with the reset OCV.

Abstract: A battery management system and method. The battery management system manages a battery of a hybrid vehicle including a motor, a battery, and a main switch connecting the motor and the battery. The battery management system includes a sensing unit and an MCU. The sensing unit measures the current, the voltage and the temperature of the battery. The MCU integrates the battery current to produce an integrated current value, and determines whether the battery is overcharged or over discharged using the integrated current value.

Abstract: A battery management system and a driving method thereof, to set a discharge completion voltage using the cell voltages of cells of a battery, and to balance the cell voltages according to the set discharge completion voltage.

Abstract: The present invention relates to a state of charge (SOC) compensation method for a vehicle using electrical energy, and a battery management system using the SOC compensation method. To determine the SOC of the battery, charge and discharge current of the battery is used to calculate a first SOC of the battery and a first corresponding voltage, a rheobasic voltage is calculated, an integration error corresponding to a difference between the first voltage and the rheobasic voltage is calculated, a SOC compensation factor is added to the first SOC when the integration error is greater than a first threshold value, and a SOC compensation factor is subtracted from the first SOC when the integration error is less than a second threshold value.