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 determining lithium battery passivation starts by applying a load across a lithium battery at the start of a test interval. Measurements of the battery's voltage are taken after applying the load, and then again periodically during the test interval. A final measurement of the battery's voltage at the end of the test interval. The state of the battery is then determined based on the first and final measurements, and at least one of the periodic measurements.

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 inclduig 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 diagnostic method and a diagnostic system for an electrochemical energy storage cell, and a vehicle including the diagnostic system. An electrical current due to an electrical connection between the energy storage cell and a central load is modulated at a first excitation frequency and is measured centrally. An electrical voltage at the energy storage cell is measured and a first impedance value is determined based on the electrical current and the electrical voltage. Also, a previously-known electrical current due to an electrical connection between the energy storage cell and a predefined cell-individual load is modulated at a second excitation frequency. The electrical voltage occurring at the energy storage cell is measured and a second impedance value is determined based on the previously-known electrical current and the electrical voltage. Diagnostic information is determined and output based on a comparison of the first impedance value with the second impedance value.

A circuit includes a differential stage configured to provide a differential output signal. An analog-to-digital converter is coupled to first and second output nodes of the differential stage. The analog-to-digital converter is configured to provide an output signal that is a function of the differential output signal from the differential stage. A multiplexer is configured to receive a differential input signal. The multiplexer includes a test switch switchable between a conductive state and a non-conductive state. In the conductive state, the test switch couples the first input node and the second input node of the differential stage. Test signal injection circuitry is activatable to force a differential current through the differential stage. The circuit is selectively switchable between an operational mode and a self-test mode.

A battery diagnostic apparatus and a battery diagnostic method that are capable of accurately determining a deteriorated state of a battery and enabling use of the battery immediately before or near the end of the battery life are provided. The battery diagnostic apparatus includes a power supply monitoring unit 5 configured to detect that a power supply voltage has changed from less than a predetermined voltage to equal to or more than the predetermined voltage, and a controller 4 configured to measure a battery voltage in a predetermined period after the detection that the power supply voltage is equal to or more than the predetermined voltage, calculate electric power associated with a remaining capacity of the battery 1 based on the battery voltage, and perform deterioration determination of the battery 1 based on the electric power associated with the remaining capacity of the battery 1.

An electronic load apparatus is provided and adapted to allow an enhanced driving circuit to be disposed between a voltage-dividing circuit and power components to ensure the driving capability of the power components not coupled to a control circuit to thereby adjust a response voltage quickly, shorten a response time period and thus increase overall response speed, suppress transient voltage variation and thus preclude a signal delay otherwise arising from a load circuit, allow the power components series-connected in an electronic load apparatus to be driven quickly, reduce the risk of damaging the power components, and enhance the stability and reliability of the electronic load apparatus.

A monitoring system for controlling self-testing of a traction elevator includes a self-testing process module in communication with a three-phase AC back-up battery power supply. The self-testing process module includes a processor configured to initiate and control a series of steps for performing measurements of the three-phase AC back-up battery power supply, including measurements of the battery supply during a simulated emergency situation (“rescue/evacuation”). The processor is programmed to initiate testing on a defined schedule and transmit test results to a maintenance system (including remotely-located systems) on a routine basis. The monitoring system also includes a display unit providing visual information regarding the status of self-testing processes and their results and a communications unit for transmitting test results to a remote maintenance controller.

A system and method for providing an application-independent estimation of the state of health (SOH) of a battery. A battery terminal voltage, under a non-zero load, when a specific amount of charge has been drawn from the battery is compared to stored terminal voltage test data obtained under the same conditions. An estimate of SOH is provided in response to the comparison.

A method of testing a rechargeable battery (4) connected to a DC bus (5) of a converter (11) of a power supply system (10) including a control system (12) for controlling power transfer between a power source (2), the rechargeable battery (4), and a load (3) connected to the DC bus (5) is provided. The method includes: setting a test discharge current (I4d) and a test end voltage (Vend) for the rechargeable battery (4) to be used during the test; at a first point in time (T0), starting a test run measuring a current (I4) from the rechargeable battery (4) and a voltage (V4) over the rechargeable battery (4); at a second point in time (Tend), when the V4 becomes equal to the Vend, terminating the test run; and registering the time period elapsed between T0 and Tend as a measure of the status of the rechargeable battery (4).