Abstract: A system of testing electricity flow of a battery manages registration, modification, deletion, and display of a set value, a measured value, and a diagnostic value for each test item for the battery and matches the set value for each test item registered by the test item manager with a type of the battery and stores the set value. The system also identifies a phase difference between an input frequency input to the battery and an output frequency corresponding to the input frequency to determine a high-frequency resonant frequency and then calculates an AC impedance corresponding to the determined high-frequency resonant frequency and compares the calculated AC impedance with an electricity flow upper limit to diagnose that the electricity flow is normal when the calculated AC impedance is lower than the electricity flow upper limit and diagnose that the electricity flow is abnormal when the calculated AC impedance is higher.

Abstract: A device and method of estimating state-of-health of a battery is provided. A device of estimating a state-of-health (SOH) of a battery includes: a memory configured to load a program for calculating a state-of-balance (SOB) value by voltage of a plurality of cells constituting the battery and estimating a state-of-health balance value which is a state-of-health value of the battery to which the state-of-balance value by voltage is applied; and a processor configured to execute instructions included in the program loaded by the memory. A device and method of estimating state-of-charge of a battery is provided. A device of estimating state-of-charge (SOC) of a battery includes: a memory configured to load a program for correcting a voltage-to-remaining capacity correlation, in which a battery voltage is matched for each remaining capacity, based on a state-of-balance value by voltage of the battery; and a processor configured to execute instructions included in the program loaded in the memory.

Abstract: Detecting a defect in a rechargeable battery includes measuring an output signal by applying an input signal to the battery while modulating frequency, calculating an AC impedance according to the frequency and the output signal, Nyquist plotting the AC impedance and building an equivalent circuit model based on the plot, calculating a product of a charge transfer resistance and an electric double layer capacitance in the model as a time constant or calculating a slope of a straight line appearing in a low-frequency region in the plot, comparing the time constant with a predetermined time constant or comparing an absolute value of the calculated slope of the straight line with a predetermined slope absolute value, and determining the battery is defective when the time constant is less than the predetermined time constant or when the absolute value of the calculated slope is smaller than the predetermined slope absolute value.

Abstract: An impedance measurement device of the present disclosure includes: an electrochemical energy device; an amplifier connected to each connection terminal of the electrochemical energy device and configured to amplify a signal introduced into a wiring; and a main board configured to receive the signal from the amplifier and measure an impedance. Accordingly, the present invention has advantages in that high resistance to electromagnetic interference may be achieved by disposing a preamplifier close to a terminal of an electrochemical energy device to amplify only the signal without amplifying a noise introduced into a wiring.

Abstract: A system for obtaining state information of a battery may be disclosed. The system includes: at least one first harness cable for obtaining, on the basis of a CAN protocol, data indicating state information of the battery from a battery management system of the battery; an analyzer for providing a driving signal for driving the battery management system; and a first junction box for transmitting the data input through the first harness cable to the analyzer, wherein the analyzer may be configured to output the data received from the first junction box to the outside.

Abstract: A system for obtaining state information of a battery may be disclosed. The system includes: at least one first harness cable for obtaining, on the basis of a CAN protocol, data indicating state information of the battery from a battery management system of the battery; an analyzer for providing a driving signal for driving the battery management system; and a first junction box for transmitting the data input through the first harness cable to the analyzer, wherein the analyzer may be configured to output the data received from the first junction box to the outside.