A self-discharge inspection method for a power storage device having a property that while the power storage device is pressed under a first load and charged with a first device voltage, in which a device voltage decreases when a load is reduced from the first load, includes detecting the first device voltage of the power storage device pressed under the first load and charged, continuously applying a power-supply voltage equal to the first device voltage from an external power supply, detecting a power-supply current flowing to the power storage device, determining a self-discharge state of the power storage device based on the detected power-supply current, and reducing the load applied to the power storage device from the first load by a load reduction amount before the power-supply current stabilizes after start of the voltage continuously applying.

A charging/discharging test system includes a charging/discharging test device; and a controller to output a first control signal commanding to start a charging/discharging test for a first battery. The charging/discharging test device repeatedly performs a first charge/discharge cycle until a cumulative capacity of the first battery by the first charge/discharge cycle reaches a reference capacity in response to the first control signal. The first charge/discharge cycle is comprised of a first constant current charging until a first end-of-charge voltage is reached, a first rest period, a first constant current discharging until a first end-of-discharge voltage is reached and a second rest period in a sequential order, at a first temperature condition. Each time the first charge/discharge cycle is performed, the controller adds the cumulative capacity and a voltage drop of the first battery over the first rest period to a first test dataset.

The present invention discloses an external battery short-circuit testing device, configured to perform short-circuit test on a battery pack under test. The external battery short-circuit testing device comprises a plurality of fuses; a Hall current transducer, coupled to the plurality of fuses; a current meter, coupled to the Hall current transducer and the battery pack under test; a voltmeter, coupled to the battery pack under test; a variable resistor, coupled to the Hall current transducer; an electromagnetic switch, coupled to the variable resistor and the battery pack under test; and an operation unit, comprising a voltage measurement unit, a current measurement unit, a temperature measurement unit and a switch control unit.

A system and method for monitoring characteristics of an electric energy device includes generating an external short from the electric energy device. The external short occurs at a known distance from a sensor and has at least one known external resistance. The received signal representing change in electromagnetic field due to the applied external short may be analyzed to determine a signal parameter that is then analyzed in comparison to a lookup table, based on the known conditions including distance, temperature and the external resistance. The output of this analyses in comparison with expected values may be utilized to identify a characteristic of the energy device.

A method for detecting a storage battery of a vehicle includes: acquiring the noise intensity and battery information of the storage battery; according to the noise intensity and the battery information, selecting a battery detection scheme from among at least two preset candidate battery detection schemes. The battery detection scheme includes one among a discharge load value, detection frequency, duty cycle and detection time, the discharge load value and the detection frequency are related to the noise intensity, and the duty cycle and the detection time are related to the battery information; and detecting the storage battery according to the battery detection scheme. By means of the noise intensity and the battery information, a comprehensive selection of a battery detection scheme may be used to achieve the rapid and accurate detection of the storage battery even in circumstances of noise interference and/or poor health of the storage battery.

A method of determining an internal resistance of a rechargeable electrical energy storage includes: detecting a first voltage of the energy storage while a first current magnitude is drained from the energy storage; detecting a second voltage of the energy storage while a second current magnitude is drained from the energy storage, the second current magnitude being larger than the first current magnitude; implementing a periodic switch-over between the drain of the first current magnitude and the drain of the second current magnitude; and determining the internal resistance based on the detected first and second voltages, which are detected by the periodic switch-over between the first and second current magnitudes.

An electrochemical storage diagnostic system is configured to perform an electrical test to measure energy storage device parameters. The diagnostic system includes a charge management controller, electrically coupled to a power multiplexer, a power converter circuit, and an isolated converter circuit. The charge management controller is programmed with instructions to identify a device under test, selected from at least one member of the plurality of energy storage devices to perform an electrical test. Then, adjust a charge in the secondary energy storage device to a target voltage through the power multiplexer by transferring energy between the secondary energy storage device and a support device, selected from at least one member of the plurality energy storage devices. After that, transfer electrical power through the power multiplexer and power converter circuit to the device under test in order to perform the electrical test. Finally, complete the electrical test.

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.

A battery diagnosis device includes: one or more sensors which measure at least one of a current value, a voltage value, and a temperature value of a battery; a first determination unit which acquires, from the sensor, at least one of measured values of the current value, the voltage value, and the temperature value of the battery, and determines a state of the battery by using a first method, based on the acquired measured values; a second determination unit which acquires, from the sensor, at least one of measured values of the current value, the voltage value, and the temperature value of the battery, and determines the state of the battery by using a second method different from the first method, based on the acquired measured values; and a diagnosis unit which diagnoses the battery, based on determination results of the first determination unit and the second determination unit.

A method for estimating a state of a battery pack using a controller having battery state estimator (BSE) logic includes receiving or delivering a constant baseline current via the battery pack. Current oscillations having time-variant frequency content are selectively injected into the baseline current via the controller in response to a predetermined condition. The baseline current and the current oscillations combine to form a final current. The method includes estimating a battery parameter via the BSE logic concurrently with the current oscillations to generate an estimated battery parameter, and estimating the present state of the battery pack via the controller using the estimated battery parameter. An electrical system includes a rotary electric machine that is electrically connected to and driven by the battery pack, and a controller configured to execute the method.