US-12620816-B2 - Battery type determination system, method for determining battery type, and storage medium

US12620816B2US 12620816 B2US12620816 B2US 12620816B2US-12620816-B2

Abstract

A battery type determination system includes an electric circuit connected to a battery, and a battery type determination device that determines a type of the battery on the basis of a characteristic value of the electric circuit. The electric circuit includes an AC power supply having a variable frequency, and a capacitor circuit. The battery type determination device includes a resonance state detection unit that detects at least one resonance state in response to an AC signal output from the AC power supply, a resonance frequency detection unit that detects a resonance frequency in the resonance state, a resonance characteristic detection unit that uses the resonance frequency as a resonance characteristic of the battery, and a determination unit that determines whether or not the battery is of the same type as a reference battery by comparing the resonance characteristic of the battery with a reference resonance characteristic of the reference battery serving as a reference for the battery.

Inventors

Yasumichi Onuki

Assignees

HONDA MOTOR CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20230215
Priority Date: 20220331

Claims (9)

1 . A battery type determination system comprising: an AC power supply configured to output a variable-frequency AC signal; and a capacitor circuit including a first capacitor connected in parallel with a battery and a second capacitor connected in series with the battery, the capacitor circuit including a variable capacitance realized by selectively connecting one or more capacitors via switches; a resonance state detector configured to detect at least one resonance state based on a peak of a resonance current or a resonance voltage caused by an inductance component of the battery and a capacitance component of the capacitor circuit in response to the AC signal; a resonance characteristic detector configured to detect a resonance frequency for each of a plurality of capacitance values of the capacitor circuit and to generate a resonance-characteristic vector comprising the detected frequencies; and a determination unit configured to determine whether the battery is of a same type as a reference battery by comparing the resonance-characteristic vector with a reference resonance characteristic stored in a calibrated database and using a predetermined threshold-based decision rule.
2 . The battery type determination system according to claim 1 , further comprising: a resonance current detection unit that detects a magnitude of a resonance current, which is a current when a frequency of the AC signal is the resonance frequency, with respect to an AC voltage of the AC signal, and the resonance characteristic detection unit uses the resonance current as the resonance characteristic of the battery.
3 . The battery type determination system according to claim 1 , further comprising: a resonance voltage detection unit that detects a magnitude of a resonance voltage, which is a voltage when the frequency is the resonance frequency, with respect to the AC voltage of the AC signal, and the resonance characteristic detection unit uses the resonance voltage as the resonance characteristic of the battery.
4 . The battery type determination system according to claim 1 , wherein the capacitor circuit comprises a variable capacitor having a variable capacitance, and the determination unit determines whether or not the battery is of the same type as the reference battery by comparing the resonance characteristic of the battery for each different capacitance of the variable capacitor with the reference resonance characteristic of the reference battery.
5 . The battery type determination system according to claim 4 , wherein the variable capacitor comprises capacitors connected in parallel with each other and switches connected to the capacitors.
6 . The battery type determination system according to claim 1 , wherein the capacitor circuit is configured of a first capacitor connected in parallel with the battery with respect to the AC power supply and a second capacitor connected in series with the battery and the first capacitor with respect to the AC power supply.
7 . The battery type determination system according to claim 1 , wherein the capacitor circuit is configured of a first capacitor connected in parallel with the battery with respect to the AC power supply and a second capacitor connected in series with the battery with respect to the AC power supply and connected in parallel with the first capacitor.
8 . A method for determining a battery type comprising: outputting a variable-frequency AC signal; a resonance state detecting step of detecting at least one resonance state based on a peak of a resonance current or a resonance voltage caused by an inductance component of a battery and a capacitance component of a capacitor circuit in response to the AC signal, the capacitor circuit including a first capacitor connected in parallel with a battery and a second capacitor connected in series with the battery, the capacitor circuit including a variable capacitance realized by selectively connecting one or more capacitors via switches; a resonance characteristic detecting step of detecting a resonance frequency for each of a plurality of capacitance values of the capacitor circuit and generating a resonance-characteristic vector comprising the detected frequencies; and a determining step of determining whether the battery is of a same type as a reference battery by comparing the resonance-characteristic vector with a reference resonance characteristic stored in a calibrated database and using a predetermined threshold-based decision rule.
9 . A computer-readable non-transitory storage medium which stores a program that causes a computer to execute: detecting at least one resonance state based on a peak of a resonance current or a resonance voltage caused by an inductance component of a battery and a capacitance component of a capacitor circuit in response to a variable-frequency AC signal, the capacitor circuit including a first capacitor connected in parallel with a battery and a second capacitor connected in series with the battery, the capacitor circuit including a variable capacitance realized by selectively connecting one or more capacitors via switches; detecting a resonance frequency for each of a plurality of capacitance values of the capacitor circuit and generating a resonance-characteristic vector comprising the detected frequencies; and determining whether the battery is of a same type as a reference battery by comparing the resonance-characteristic vector with a reference resonance characteristic stored in a calibrated database and using a predetermined threshold-based decision rule.

Description

CROSS-REFERENCE TO RELATED APPLICATION Priority is claimed on Japanese Patent Application No. 2022-059098, filed Mar. 31, 2022, the content of which is incorporated herein by reference. BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a battery type determination system, a method for determining a battery type, and a storage medium. Description of Related Art In known techniques, a method for identifying a type of a battery on the basis of a DC internal resistance during charging of the battery and a DC internal resistance during discharging thereof is known (see, for example, PCT International Publication No. WO 2015/133068). In such a method, the type of the battery is determined by attaching a resistor having a predetermined resistance value to the battery and measuring the resistance value at the time of identification. There is also a method for attaching an IC chip to a battery to determine a type of the battery on the basis of an identification signal output by the IC chip. SUMMARY OF THE INVENTION However, in known techniques, it is necessary to attach a component such as a resistor or IC chip to a battery, and thus costs are incurred. In addition, if these components are counterfeited, they are attached to an unintended battery, which makes it impossible to correctly identify a battery type. Aspects of the present invention have been made in consideration of such circumstances, and one of objects thereof is to determine a battery type without attaching an identification component. In order to solve the above problems and achieve the objects, the present invention adopts the following aspects. (1) A battery type determination system according to an aspect of the present invention includes an electric circuit connected to a battery, and a battery type determination device that determines a type of the battery on the basis of a characteristic value of the electric circuit. The electric circuit includes an AC power supply that is connected to the battery and has a variable frequency, and a capacitor circuit that is configured of at least one capacitor and provided between the battery and the AC power supply. The battery type determination device includes a resonance state detection unit that detects at least one resonance state generated by an inductance component of the battery and a capacitance component of the capacitor circuit in response to an AC signal output from the AC power supply, a resonance frequency detection unit that detects a resonance frequency in the resonance state, a resonance characteristic detection unit that uses the resonance frequency as a resonance characteristic of the battery, and a determination unit that determines whether or not the battery is of the same type as a reference battery by comparing the resonance characteristic of the battery with a reference resonance characteristic of the reference battery serving as a reference for the battery. (2) In the above aspect (1), the battery type determination device may further include a resonance current detection unit that detects a magnitude of a resonance current, which is a current when a frequency of the AC signal is the resonance frequency, with respect to an AC voltage of the AC signal, and the resonance characteristic detection unit may use the resonance current as the resonance characteristic of the battery. (3) In the above aspect (1), the battery type determination device may further include a resonance voltage detection unit that detects a magnitude of a resonance voltage, which is a voltage when the frequency is the resonance frequency, with respect to the AC voltage of the AC signal, and the resonance characteristic detection unit may use the resonance voltage as the resonance characteristic of the battery. (4) In any one of the above aspects (1) to (3), the capacitor circuit may be a variable capacitor having a variable capacitance, and the determination unit may determine whether or not the battery is of the same type as the reference battery by comparing the resonance characteristic of the battery for each different capacitance of the variable capacitor with the reference resonance characteristic of the reference battery. (5) In the above aspect (4), the variable capacitor may be configured of capacitors connected in parallel with each other and switches connected to the capacitors. (6) In any one of the above aspects (1) to (3), the capacitor circuit may be configured of a first capacitor connected in parallel with the battery with respect to the AC power supply and a second capacitor connected in series with the battery and the first capacitor with respect to the AC power supply. (7) In any one of the above aspects (1) to (3), the capacitor circuit may be configured of a first capacitor connected in parallel with the battery with respect to the AC power supply and a second capacitor connected in series with the battery with respect to the AC power supply and connected in par