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 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.

One or more examples relate to an apparatus to amplify differential voltage signal components of voltage across a resistor. Such an apparatus may include a resistor; a differential amplification circuit operatively coupled with the resistor to amplify a differential voltage signal component of a voltage across the resistor; and an operative coupling between the resistor and the differential amplification circuit to pass the differential voltage signal component and isolate a common mode voltage signal component of the voltage across the resistor.

One or more examples relate to an apparatus to amplify differential voltage signal components of voltage across a resistor. Such an apparatus may include a resistor; a differential amplification circuit operatively coupled with the resistor to amplify a differential voltage signal component of a voltage across the resistor; and an operative coupling between the resistor and the differential amplification circuit to pass the differential voltage signal component and isolate a common mode voltage signal component of the voltage across the resistor.

A detection coil includes a first sub coil disposed on a first PCB, the first sub coil includes a first part, and a second part that is disposed under the first part and that includes: one end connected to one end of the first part and is wound in a direction opposite to a direction the first part is wound. The detection coil includes a second sub coil disposed on a second PCB and including a third part and a fourth part disposed under the third part. The fourth part includes one end connected to one end of the third part, and is wound in a direction opposite to a direction the third part is wound. The first and second parts have polygonal shapes symmetrical to each other. The third and fourth parts have polygonal shapes symmetrical to each other. The first and second sub coils are arranged to partially overlap each other.

A detection coil includes a first sub coil disposed on a first PCB, the first sub coil includes a first part, and a second part that is disposed under the first part and that includes: one end connected to one end of the first part and is wound in a direction opposite to a direction the first part is wound. The detection coil includes a second sub coil disposed on a second PCB and including a third part and a fourth part disposed under the third part. The fourth part includes one end connected to one end of the third part, and is wound in a direction opposite to a direction the third part is wound. The first and second parts have polygonal shapes symmetrical to each other. The third and fourth parts have polygonal shapes symmetrical to each other. The first and second sub coils are arranged to partially overlap each other.

Disclosed is a test system including a transmitter, a receiver, a measuring circuit, and a control circuit. The transmitter is coupled to the receiver in a DC coupling manner, and includes: a signal input circuit determining an output signal according to an input signal; a current source coupled between the signal input circuit and a low power-supply terminal and configured to determine a total current passing through the signal input circuit in a non-open/short-circuited condition; and a signal output wire circuit outputting the output signal for a performance test. The receiver includes: an impedance circuit coupled to the signal output wire circuit; and a coupling circuit coupling the impedance circuit with a high power-supply terminal. The measuring circuit measures a target current/voltage between the high power-supply terminal and low power-supply terminal to generate a measurement result. The control circuit determines whether the transmitter/receiver is open/short-circuited according to the measurement result.

Disclosed is a test system including a transmitter, a receiver, a measuring circuit, and a control circuit. The transmitter is coupled to the receiver in a DC coupling manner, and includes: a signal input circuit determining an output signal according to an input signal; a current source coupled between the signal input circuit and a low power-supply terminal and configured to determine a total current passing through the signal input circuit in a non-open/short-circuited condition; and a signal output wire circuit outputting the output signal for a performance test. The receiver includes: an impedance circuit coupled to the signal output wire circuit; and a coupling circuit coupling the impedance circuit with a high power-supply terminal. The measuring circuit measures a target current/voltage between the high power-supply terminal and low power-supply terminal to generate a measurement result. The control circuit determines whether the transmitter/receiver is open/short-circuited according to the measurement result.

A switch diagnosing apparatus and method capable of effectively diagnosing a charging switch and a discharging switch provided to a battery pack. It is possible to effectively diagnose the state of a switch as at least one of a normal state, an open stuck state, a closed stuck state and a drift state, thereby improving the diagnosing efficiency.

A switch diagnosing apparatus and method capable of effectively diagnosing a charging switch and a discharging switch provided to a battery pack. It is possible to effectively diagnose the state of a switch as at least one of a normal state, an open stuck state, a closed stuck state and a drift state, thereby improving the diagnosing efficiency.