Battery abnormality detection device, battery abnormality detection method, and recording medium recorded with battery abnormality detection program
A battery abnormality detection device that: for an equalization circuit including a discharge circuit provided with a switch that, in a case of being switched ON, causes a battery cell to discharge, and including a detector connected to the battery cell in parallel to the discharge circuit so as to detect a voltage of the battery cell, acquires a first voltage in a case in which the switch has been switched OFF and a second voltage in a case in which the switch has been switched ON, as detected by the detector, and estimates, from a detected value of one of the acquired first voltage or second voltage, an estimated value of another of the acquired first voltage or second voltage, and determines whether or not an abnormality has occurred in the equalization circuit based on the detected value and the estimated value.
1. A battery abnormality detection device comprising:
a memory; and
a processor coupled to the memory,
the processor being configured to:
for an equalization circuit including a discharge circuit provided with a switch that, in a case of being switched ON, causes a battery cell to discharge, and including a detector connected to the battery cell in parallel to the discharge circuit so as to detect a voltage of the battery cell,
acquire a first voltage in a case in which the switch has been switched OFF and a second voltage in a case in which the switch has been switched ON, as detected by the detector, and
estimate, from a detected value of one of the acquired first voltage or second voltage, an estimated value of another of the acquired first voltage or second voltage, and determine whether or not an abnormality has occurred in the equalization circuit based on the detected value and the estimated value.
2. The battery abnormality detection device of claim 1 , wherein:
the equalization circuit is connected between a plurality of the battery cells connected together in series by connection through an interposed common circuit; and
the processor is configured to switch to ON a switch corresponding to each of a plurality of the battery cells that are non-adjacent, and to acquire respective second voltages of the plurality of battery cells from the detector.
3. The battery abnormality detection device of claim 1 , wherein the processor is configured to determine the abnormality a plurality of times, and to determine that an abnormality has occurred in the equalization circuit in a case in which a number of times a difference between the detected value and the estimated value has been a predetermined threshold or greater has reached a predetermined number of times or greater.
4. The battery abnormality detection device of claim 1 , wherein a main switch enabling ON/OFF switching of power supply from the battery cell to a load is switched OFF by the processor in a case in which an abnormality has been detected in the equalization circuit.
5. A battery abnormality detection method, the battery abnormality detection method comprising,
for an equalization circuit including a discharge circuit provided with a switch that, in a case of being switched ON, causes a battery cell to discharge and including a detector connected to the battery cell in parallel to the discharge circuit so as to detect a voltage of the battery cell,
by a processor:
acquiring a first voltage in a case in which the switch has been switched OFF and a second voltage in a case in which the switch has been switched ON, as detected by the detector, and
estimating, from a detected value of one of the acquired first voltage or second voltage, an estimated value of another of the acquired first voltage or second voltage, and determining whether or not an abnormality has occurred in the equalization circuit based on the detected value and the estimated value.
6. The battery abnormality detection method of claim 5 , wherein:
the equalization circuit is connected between a plurality of the battery cells connected together in series by connection through an interposed common circuit; and
a switch corresponding to each of a plurality of the battery cells that are non-adjacent is switched to ON, and respective second voltages of the plurality of battery cells from the detector are acquired.
7. The battery abnormality detection method of claim 5 , wherein the abnormality is determined a plurality of times, and it is determined that an abnormality has occurred in the equalization circuit in a case in which a number of times a difference between the detected value and the estimated value has been a predetermined threshold or greater has reached a predetermined number of times or greater.
8. The battery abnormality detection method of claim 5 , wherein a main switch enabling ON/OFF switching of power supply from the battery cell to a load is switched OFF in a case in which an abnormality has been detected in the equalization circuit.
9. A non-transitory computer readable recording medium recorded with a program executable by a computer to perform battery abnormality detection processing comprising,
for an equalization circuit including a discharge circuit provided with a switch that, in a case of being switched ON, causes a battery cell to discharge and including a detector connected to the battery cell in parallel to the discharge circuit so as to detect a voltage of the battery cell:
acquiring a first voltage in a case in which the switch has been switched OFF and a second voltage in a case in which the switch has been switched ON, as detected by the detector, and
estimating, from a detected value of one of the acquired first voltage or second voltage, an estimated value of another of the acquired first voltage or second voltage, and determining whether or not an abnormality has occurred in the equalization circuit based on the detected value and the estimated value.
10. The non-transitory computer readable recording medium of claim 9 , wherein:
the equalization circuit is connected between a plurality of the battery cells connected together in series by connection through an interposed common circuit; and
a switch corresponding to each of a plurality of the battery cells that are non-adjacent is switched to ON, and respective second voltages of the plurality of battery cells from the detector are acquired.
11. The non-transitory computer readable recording medium of claim 9 , wherein the abnormality is determined a plurality of times, and it is determined that an abnormality has occurred in the equalization circuit in a case in which a number of times a difference between the detected value and the estimated value has been a predetermined threshold or greater has reached a predetermined number of times or greater.
12. The non-transitory computer readable recording medium of claim 9 , wherein a main switch enabling ON/OFF switching of power supply from the battery cell to a load is switched OFF in a case in which an abnormality has been detected in the equalization circuit.