An electrically-driven vehicle includes a power storage device that stores power to be supplied to a motor, and a controller that controls output of the power storage device. The controller estimates a SOC of the power storage device. The controller detects output power of the power storage device and calculates an output power upper limit value of the power storage device by using the SOC when a voltage of the power storage device reaches a lower limit voltage during discharge of the power storage device. The controller stops the electrically-driven vehicle in the case where the detected output power is lower than the output power upper limit value.

A method for detecting a fault in a direct current (DC) battery of a pitch system includes receiving, via a server, a plurality of voltage signals of the battery over at least one time period. The method also includes storing, via a database of the server, the plurality of voltage signals of the battery for the predetermined time period. Further, the method includes determining, via the server, a state of the battery as a function of the plurality of voltage signals. When the state of the battery is indicative of a battery fault, the method includes implementing a corrective action for the battery.

A current sensor automatically adjusting an offset voltage, includes an input corrector, upon receiving a first voltage, a second voltage, and a control signal, configured to correct either one or both of the first voltage and the second voltage to reduce an absolute value of a difference between the first voltage and the second voltage based on the control signal, and output a correction result; an input amplifier configured to amplify a voltage output from the input corrector; an output amplifier configured to generate an output voltage when a voltage amplified by the input amplifier is input; a controller including a switch connected to one of voltages amplified by the input amplifier to be grounded when a difference between the first voltage and the second voltage is larger than a first threshold value; and a correction circuit controller configured to generate the control signal to input to the input corrector.

Example embodiments of the described technology provide an apparatus for testing an electrochemical system. The apparatus may comprise a testing module electrically coupled to the electrochemical system. The testing module may comprise a discharge circuit configured to draw current from the electrochemical system at a plurality of different rates. The discharge circuit may be configured to continuously draw current from the electrochemical system once a test of the electrochemical system is commenced. The apparatus may also comprise a measurement module which may be configured to measure voltage across terminals of the electrochemical system and current drawn from the electrochemical system during the test. The apparatus may also comprise a processor. The processor may be configured to compensate at least in part the measured voltage for voltage drift which was generated by continuously drawing current from the electrochemical system. The processor may also be configured to compute a state of health of the electrochemical system based at least in part on the compensated voltage and the measured current.

When a battery is insufficiently charged to allow ohmic testing of its condition, a charging source is connected to the battery, and a charge-acceptance test is performed to determine whether the battery is simply discharged but otherwise usable or beyond its useful service life.

An apparatus for inspecting a failure of an electrode assembly before injecting an electrolyte includes a short-circuit tester configured to detect a short circuit of the electrode assembly by applying a predetermined voltage to a positive electrode and a negative electrode of the electrode assembly; a multimeter electrically connected to the short-circuit tester and configured to measure a voltage and a current of the electrode assembly over time; and a failure determination part connected to the multimeter and configured to monitor changes in voltage and current measured by the multimeter and determine a type of a failure of the electrode assembly from data on the changes in voltage and current over a predetermined period of time. A method of inspecting a failure of an electrode assembly using the same is also provided.

An apparatus for measuring the internal resistance of battery cells in a variable number unit in an online state is proposed. The apparatus may include a switch array, a variable resistor, a high-speed switch, a measurement sensor, and a controller. The switch array configures a measurement target battery cell by selecting at least one battery cell from among a plurality of battery cells included in a battery module. The variable resistor is connected to the measurement target battery cell via the switch array. The high-speed switch switches a connection between the measurement target battery cell and the variable resistor. The measurement sensor detects a measurement voltage of the measurement target battery cell and a measurement current of the measurement target battery cell in an online state of the battery module. The controller derives an internal resistance of the measurement target battery cell through the measurement voltage and the measurement current.

The invention relates to means for a calibration standards-compliant determination of the electrical energy transferred from a charging station, which make a measurement at the transfer point, that is to say at the vehicle-side end of the charging cable, unnecessary. Here, the electrical energy transferred from a charging station is determined by a measurement of the energy before the transfer point, wherein the reactive power component from the termination point as far as the transfer point is compensated. The reactive power component is determined from at least one second electrical variable, for example a resistance of a conductor or a conductor shield, which is in a fixed relationship with an analog electrical variable that is relevant to the transferred electrical energy, for example an ohmic total resistance of at least two conductors involved in a charging circuit.

In a voltage detection circuit, if a driving signal is provided from a control circuit to a drive target circuit that is one of a plurality of individual detection circuits, and a non-driving signal is provided from the control circuit to the other non-target circuits, switch portions of the non-target circuits are turned off to prevent a current from flowing through first transistors and second transistors of the non-target circuits, whereby generation of the output voltages in the non-target circuits is stopped, and a switch portion of the drive target circuit is turned on so as to allow a current to flow through a first transistor and a second transistor of the drive target circuit, whereby a voltage according to a voltage across both ends of an electricity storage cell corresponding to the drive target circuit is applied to an output conductive path.

The invention relates to a battery system (10) for an electric vehicle, comprising a battery pack (5) having a positive pole (22), a negative pole (21), at least one battery cell (2) and a pack voltage divider (25), and comprising at least one coupling network having a negative terminal (11) and a positive terminal (12), wherein the pack voltage divider (25) comprises a positive pack resistor (RP2) and a positive sub-pack-resistor (RSP2) which are connected to one another in series between the positive pole (22) and a reference point (50), and a negative pack resistor (RP1) and a negative sub-pack-resistor (RSP1) which are connected to one another in series between the negative pole (21) and the reference point (50). The at least one coupling network comprises a coupling voltage divider (15) having a positive coupling resistor (RK2) and a positive sub-coupling-resistor (RSK2) which are connected to one another in series between the positive terminal (12) and the reference point (50), and having a negative coupling resistor (RK1) an a negative sub-coupling-rcsistor (RSK1) which are connected to one another in series between the negative terminal (11) and the reference point (50). The invention also relates to a method for diagnosing a battery system (10) according to the invention, wherein a positive pack voltage (UP2) falling at the positive sub-pack-resistor (RSP2) is measured, a negative pack voltage (UP1) falling at the negative sub-pack-rcsistor (RSP I) is measured, a positive coupling voltage (UK2) falling at the positive sub-coupling-resistor (RSK2) is measured, a negative coupling voltage (UK1) falling at the negative sub-coupling-resistor (RSK1) is measured, and an evaluation of the measured voltages (UP1, UP2, UK1, UK2) is carried out. The invention also relates to an electric vehicle comprising a battery system (10) according to the invention.