公开(公告)号：US20250116716A1

公开(公告)日：2025-04-10

申请号：US18984097

申请日：2024-12-17

Applicant: DENSO CORPORATION

Inventor： Yuki HORI ,  Masaki UCHIYAMA ,  Taisuke KURACHI

IPC: G01R31/388

Abstract: A capacity estimation device that estimates a capacity of a power storage unit at a time of charging the power storage unit includes: a control unit that reduces an average current in a predetermined current restriction section after a start of charging the power storage unit, the average current indicating an average value per unit time of a charging current flowing in the power storage unit; and an estimation unit that estimates the capacity based on a voltage change rate of the power storage unit after or within the current restriction section.

公开(公告)号：US20250028002A1

公开(公告)日：2025-01-23

申请号：US18908135

申请日：2024-10-07

Applicant: DENSO CORPORATION

Inventor： Yuki HORI ,  Masaki Uchiyama ,  Taisuke Kurachi

IPC: G01R31/3842 ,  G01R31/378 ,  G01R31/392 ,  H01M10/0525 ,  H01M10/42

Abstract: A battery remaining quantity estimation apparatus estimates a remaining quantity of a secondary battery based on a charging parameter correlated with charging time of the secondary battery and a rate of change of a voltage of the secondary battery relative to the charging parameter. This estimation apparatus determines whether a predetermined condition is met. The predetermined condition is that an amount of change in the charging parameter from the start of charging of the secondary battery until when the rate of change of the voltage becomes a maximum value is equal to or less than a predetermined amount of change. In response to determining that the predetermined condition is met, the estimation apparatus estimates a remaining quantity corresponding to a portion between two minimum values of the rate of change of the voltage during charging of the secondary battery as the remaining quantity of the secondary battery.