A voltage detection circuit includes a differential amplification circuit and a microcontroller unit (MCU). The MCU detects a differential voltage output from operational amplifiers of the differential amplification circuit, and calculates an internal resistance value of a battery cell based on the detected differential voltage. At this time, the MCU controls an amplification factor adjustment circuit of the differential amplification circuit based on a maximum voltage representing the highest voltage detectable by the MCU and the differential voltage output from the differential amplification circuit so as to set the amplification factor of the operational amplifiers.

A voltage detection circuit including a voltage input terminal, a voltage dividing circuit, a voltage comparison circuit, an output terminal, a detection voltage adjustment terminal, a voltage-current conversion circuit, and a constant current source. A voltage to be monitored is input to the voltage input terminal. The voltage dividing circuit includes series resistors between the voltage input terminal and a constant voltage terminal. The voltage comparison circuit compares a voltage divided by the voltage dividing circuit with a predetermined voltage. The comparison result is output from the output terminal. An external resistor is connected to the detection voltage adjustment terminal. The voltage-current conversion circuit is provided between the detection voltage adjustment terminal and the voltage dividing circuit. The constant current source is connected between an internal power supply voltage terminal and the detection voltage adjustment terminal.

The present invention relates to a method for determining a state of charge of a battery, including: (a) acquiring a state of charge of the battery at a current sampling time point tn; (b) acquiring a voltage Vn, a temperature Tn, and a charging rate Cn of the battery at the current sampling time point tn, and a voltage Vi of the battery at a sampling time point ti, and calculating a voltage difference Vn−Vi between the voltage Vn and the voltage Vi; (c) when the voltage difference Vn−Vi is greater than or equal to a preset voltage threshold, calculating a voltage change rate; and (d) when the voltage change rate is greater than or equal to a preset voltage change rate threshold for the first time, acquiring a corrected state of charge of the battery as an actual state of charge of the battery.

The charge control circuit includes a cell connection detection circuit monitoring a voltage between input ports to which terminals of a cell pack are connected, an overvoltage detection circuit monitoring an overvoltage of the secondary cells, a first latch circuit receiving a signal output by the cell connection detection circuit, a second latch circuit receiving a signal output by the overvoltage detection circuit, a reset circuit outputting a signal to the first latch circuit and the second latch circuit when the charge control circuit is activated, and a control circuit receiving a signal output from the second latch circuit and outputting a signal for protecting the cell pack from the overvoltage. The control circuit does not output a signal for blowing the fuse until the first latch circuit receives a detection signal of the cell connection detection circuit.

The charge control circuit includes a cell connection detection circuit monitoring a voltage between input ports to which terminals of a cell pack are connected, an overvoltage detection circuit monitoring an overvoltage of the secondary cells, a first latch circuit receiving a signal output by the cell connection detection circuit, a second latch circuit receiving a signal output by the overvoltage detection circuit, a reset circuit outputting a signal to the first latch circuit and the second latch circuit when the charge control circuit is activated, and a control circuit receiving a signal output from the second latch circuit and outputting a signal for protecting the cell pack from the overvoltage. The control circuit does not output a signal for blowing the fuse until the first latch circuit receives a detection signal of the cell connection detection circuit.

A voltage tap for measuring a voltage includes at least one contact region and one abutment surface. Using the abutment surface, the voltage tap is electrically connectable to a contact surface of an electrical circuit board. The abutment surface comprises an enlarged surface with respect to the contact surface of the electrical circuit board, so that the electrical connection between the voltage tap and the electrical circuit board is provided independently of a movement of the voltage tap.

A voltage tap for measuring a voltage includes at least one contact region and one abutment surface. Using the abutment surface, the voltage tap is electrically connectable to a contact surface of an electrical circuit board. The abutment surface comprises an enlarged surface with respect to the contact surface of the electrical circuit board, so that the electrical connection between the voltage tap and the electrical circuit board is provided independently of a movement of the voltage tap.

In some examples, apparatus comprises a multiplexer (MUX) adapted to be coupled to a set of battery cells and configured to provide a voltage of a different battery cell in the set of battery cells based on a MUX control signal. Apparatus comprises a comparator coupled to the MUX and configured to compare a MUX output signal to a threshold voltage to provide a comparator output signal. Apparatus comprises a digital control circuit configured to provide the MUX control signal to the MUX, to store the comparator output signal, and to use a logic AND gate to provide an AND gate output signal based on the stored comparator output signal.

In some examples, apparatus comprises a multiplexer (MUX) adapted to be coupled to a set of battery cells and configured to provide a voltage of a different battery cell in the set of battery cells based on a MUX control signal. Apparatus comprises a comparator coupled to the MUX and configured to compare a MUX output signal to a threshold voltage to provide a comparator output signal. Apparatus comprises a digital control circuit configured to provide the MUX control signal to the MUX, to store the comparator output signal, and to use a logic AND gate to provide an AND gate output signal based on the stored comparator output signal.

Method provides accurate state-of-health (SOH) diagnostics and prognostics during the whole-life-service of a lithium-ion battery by considering the effects of state- of-charge (SOC) and SOH on certain parameters (such as consideration of nonlinearity of the terminal voltage) during the process of SOC diagnostics and prognostics. The method integrates Lebesgue sampling and equivalent circuit model (ECM) analysis, which greatly decreases computation cost and uncertainty accumulation to provide efficient acquisition of open circuit voltage (OCV) determinations for the ECM process. The OCV curve of the battery was obtained during Hybrid Pulse Power Characterization testing by fitting a series of selected OCV points after enough rest of the subject battery. Identified parameters of ECM are updated according to terminal voltage measurement to enable accurate SOC estimation and prediction during the period from full charge to full discharge of the battery. Parameter identification is re-conducted and an initial condition for SOC estimation is updated according to SOH to enable accurate SOC estimation during the whole-life-service of battery.