Method and system for estimating the state-of-health of a battery
AssigneeVolvo Truck Corporation
InventorJonas Hellgren
Life of this patent
Estimating the term…
Abstract
A method and system for estimating the state-of-health of a battery The invention relates to a method for estimating the state-of-health, SoHest, of a battery in a vehicle, the method comprising: determining (100) a first battery property and a battery temperature of a battery in a vehicle; calculating (102) a state-of-health, SoHcalc, of a battery cell based on the determined first battery property using a predetermined model; providing (104) a function f estimating a battery cell degradation rate; updating (106) a state-of health estimated in a previous time step according to SoHest←SoHest+ƒ·dt+K·(SoHcalc−SoHest), where K is a gain factor which is dependent on operating conditions of the vehicle, and wherein K is modified (108) for each time step using a reinforcement learning agent.
Claims15
A method for estimating the state-of-health, SoHest, of a battery in a vehicle, the method comprising:
- determining a first battery property and a battery temperature of a battery in a vehicle;
- calculating a state-of-health, SoHcalc, of a battery cell based on the determined first battery property using a predetermined model;
- providing a function ƒ estimating a battery cell degradation rate;
- updating a state-of health estimated in a previous time step according to
- SoHest←SoHest+ƒ·dt+K·(SoHcalc−SoHest),
- where K is a gain factor which is dependent on operating conditions of the vehicle, and wherein K is modified for each time step using a reinforcement learning agent.
A battery system comprising a battery comprising a plurality of battery cells and a battery control unit, where the battery control unit is configured to:
- measure a first battery property and a battery temperature of a battery in a vehicle;
- calculate a state-of-health, SoHcalc, of a battery cell for the determined battery property using a predetermined model;
- provide a function ƒ estimating a battery cell degradation rate;
- update a state-of health estimated in a previous time step according to
- SoHest←SoHest+ƒ·dt+K·(SoHcalc−SoHest),
- where K is a gain factor which is a dependent on operating conditions of the vehicle, and wherein K is modified for each time step using a reinforcement learning agent.
Dependencies are inferred from the claim text.