Battery diagnosis device and battery diagnosis method
AssigneeHitachi High-Tech Corporation
InventorsAkane IMAMURA, Toru KOUNO, Hiroya FUJIMOTO, Akira FUJIMOTO, Yutaka UEDA
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Abstract
An object of the invention is to provide a technique capable of determining a state of a battery at high speed and in detail. A battery diagnosis device according to the invention determines whether a battery is in a first state based on a first difference in battery voltage within 4 msec from an end time point at which charging or discharging of the battery is ended, and further determines whether the battery is in a second state based on a second difference in battery voltage thereafter (see FIG. 3).
Claims15
A battery diagnosis device that diagnoses a state of a battery, the battery diagnosis device comprising:
- a detection unit configured to acquire a detection value of a voltage output by the battery;
- and
- a calculation unit configured to estimate a state of the battery using a difference representing a temporal change of the voltage, wherein
- the calculation unit determines whether the battery is in a first state based on, as the difference, a first difference between the voltage at a first calculation start time point after an end time point at which charging or discharging of the battery is ended and the voltage at a first time point at which a first period within 4 msec elapses from the end time point, and
- the calculation unit determines whether the battery is in a second state based on, as the difference, a second difference between the voltage at a second calculation start time point after the first calculation start time point and the voltage at a second time point at which a second period elapses from the second calculation start time point.
A battery diagnosis method for diagnosing a state of a battery, the battery diagnosis method comprising:
- a step of acquiring a detection value of a voltage output by the battery;
- and
- a step of estimating a state of the battery using a difference representing a temporal change of the voltage, wherein
- the estimating step determines whether the battery is in a first state based on, as the difference, a first difference between the voltage at a first calculation start time point after an end time point at which charging or discharging of the battery is ended and the voltage at a first time point at which a first period within 4 msec elapses from the end time point, and
- the estimating step determines whether the battery is in a second state based on, as the difference, a second difference between the voltage at a second calculation start time point after the first calculation start time point and the voltage at a second time point at which a second period elapses from the second calculation start time point.
Dependencies are inferred from the claim text.