BATTERY STATE ESTIMATION DEVICE, BATTERY STATE MANAGEMENT SYSTEM, BATTERY, BATTERY STATE ESTIMATION METHOD, AND NON-TRANSITORY STORAGE MEDIUM

摘要

The state of a battery parameter at the time of state estimation is estimated by using a plurality of pieces of parameter transition information (k, k+1), each piece of information representing an aspect of a temporal change in the battery parameter and representing the aspect of the temporal change until a predetermined state is achieved after a predetermined time that has elapsed from an initial state for each of use environments of a battery, and use environment information representing the use environment of the battery from the time of the start of use to the time of state estimation. In a case where the use environment of the battery is transited from a k-th use environment to a (k+1)-th use environment, a battery parameter pk after being used in the k-th use environment is calculated by using the parameter transition information k corresponding to the k-th use environment, and thereafter a battery parameter pk+1 after the battery in the state of the battery parameter pk is used in the (k+1)-th use environment is calculated by using the parameter transition information k+1 corresponding to the (k+1)-th use environment.

主权项

1. A battery state estimation device comprising:
a transition information storage unit which stores a plurality of pieces of parameter transition information, each piece of the parameter transition information representing an aspect of a temporal change in a battery parameter that is changed in its state with time, the change in state influencing a battery capacity, and each piece of the parameter transition information representing the aspect of the temporal change until a predetermined state is achieved after a predetermined time that has elapsed from an initial state for each of use environments of a battery; a use environment acquisition unit which acquires use environment information representing the use environment of a target battery which is a target of state estimation from a time of a start of use to a time of state estimation; and a parameter estimation unit which estimates the state of the battery parameter of the target battery at the time of state estimation, by using the use environment information and the parameter transition information, wherein, in a case where the use environment of the target battery from the time of the start of use to the time of state estimation is changed from a first use environment to an N-th use environment (where N is an integer of 2 or more) in this order (where a P-th use environment and a (P+1)-th use environment are different use environments, and P is an integer of 1 or more and (N−1) or less), the parameter estimation unit performs a process of using the parameter transition information corresponding to the P-th use environment to estimate a P-th state which is the state of the battery parameter at a time of an end of the P-th use environment in a case where the battery parameter is used in the P-th use environment, and thereafter, using the parameter transition information corresponding to the (P+1)-th use environment to estimate a (P+1)-th state which is the state of the battery parameter at a time of an end of the (P+1)-th use environment in a case where the battery parameter in the P-th state is used in the (P+1)-th use environment, to thereby estimate an N-th state which is the state of the battery parameter at a time of an end of the N-th use environment and estimate the estimated N-th state as the state of the battery parameter of the target battery at the time of state estimation.