Impedance measuring device and control method for impedance measuring device

An impedance measuring device, comprising:

• a laminated type battery, a plurality of battery cells being laminated in the laminated type battery;
• a first power supply unit configured to output an alternating current of a prescribed frequency for measuring an impedance of the laminated type battery to a positive electrode terminal of the laminated type battery;
• a second power supply unit configured to output an alternating current of the prescribed frequency to a negative electrode terminal of the laminated type battery;
• a first detection unit configured to detect an alternating-current potential difference between the positive electrode terminal and an intermediate-point terminal of the laminated type battery;
• a second detection unit configured to detect an alternating-current potential difference between the negative electrode terminal and the intermediate-point terminal;
• an adjustment unit configured to adjust an amplitude of the alternating current output from at least one of the first and second power supply units such that the alternating-current potential difference detected by the first detection unit and the alternating-current potential difference detected by the second detection unit coincide;
• a computation unit configured to compute the impedance of the laminated type battery on the basis of the alternating current adjusted by the adjustment unit and the alternating-current potential difference;
• and
• a processing unit configured to perform a process for suppressing an error of the alternating current on the basis of a phase difference between an alternating-current potential generated at the positive electrode terminal and an alternating-current potential generated at the negative electrode terminal.

A control method for an impedance measuring device with a laminated type battery, a plurality of battery cells being laminated in the laminated type battery, a first power supply unit for outputting an alternating current of a prescribed frequency for measuring an impedance of the laminated type battery to a positive electrode terminal of the laminated type battery and a second power supply unit for outputting an alternating current of the prescribed frequency to a negative electrode terminal of the laminated type battery, comprising:

• a first detection step of detecting an alternating-current potential difference between the positive electrode terminal and an intermediate-point terminal of the laminated type battery;
• a second detection step of detecting an alternating-current potential difference between the negative electrode terminal and the intermediate-point terminal;
• an adjustment step of adjusting an amplitude of the alternating current output from at least one of the first and second power supply units such that the alternating-current potential difference detected in the first detection step and the alternating-current potential difference detected in the second detection step coincide;
• a computation step of computing the impedance of the laminated type battery on the basis of the alternating current adjusted in the adjustment step and the alternating-current potential difference;
• and
• a processing step of suppressing a measurement error by processing a phase difference between an alternating-current potential generated at the positive electrode terminal and an alternating-current potential generated at the negative electrode terminal on the basis of the phase difference.

A control method for an impedance measuring device with a laminated type battery, a plurality of battery cells being laminated in the laminated type battery, a first power supply unit for outputting an alternating current of a prescribed frequency for measuring an impedance of the laminated type battery to a positive electrode terminal of the laminated type battery and a second power supply unit for outputting an alternating current of the prescribed frequency to a negative electrode terminal of the laminated type battery, comprising:

• a first detection step of detecting an alternating-current potential difference between the positive electrode terminal and an intermediate-point terminal of the laminated type battery;
• a second detection step of detecting an alternating-current potential difference between the negative electrode terminal and the intermediate-point terminal;
• an adjustment step of adjusting an amplitude of the alternating current output from at least one of the first and second power supply units such that the alternating-current potential difference detected in the first detection step and the alternating-current potential difference detected in the second detection step coincide;
• a computation step of computing the impedance of the laminated type battery on the basis of the alternating current adjusted in the adjustment step and the alternating-current potential difference;
• and
• a processing step of performing a process for suppressing an error of the alternating current on the basis of a phase difference between an alternating-current potential generated at the positive electrode terminal and an alternating-current potential generated at the negative electrode terminal.