Model based monitoring of battery system
AssigneeVestas Wind Systems A/S
InventorChris Damgaard
Life of this patent
Estimating the term…
Abstract
A battery system for storing electric energy, e.g. from a wind turbine. Battery modules are distributed in a housing and cooled by a housing cooling system. A monitoring algorithm receives input data from temperature and current sensors in battery cells from each of the battery modules, a state of a cooling system in each of the battery modules, a state of the housing cooling system such as fan rotation speed, and auxiliary inputs such as an ambient temperature. The monitoring algorithm processes the input data according to a predetermined model based on knowledge about the battery system. The model based estimated temperature within a specific battery cell is compared with the measured temperature to determine whether an abnormal operation exists.
Claims15
A battery system arranged to store electric energy, the battery system comprising:
- a plurality of battery modules, each of the plurality of battery modules comprising:
- a plurality of re-chargeable battery cells in a predetermined spatial configuration;
- a plurality of temperature sensors arranged to sense temperatures at respective positions of the respective battery module of the plurality of battery modules;
- a plurality of current sensors arranged to sense charge or discharge current at least at the plurality of re-chargeable battery cells;
- and
- a battery module cooling system arranged to provide cooling to the respective battery module of the plurality of battery modules, wherein the battery module cooling system has a plurality of states;
- a housing in which the plurality of battery modules are spatially distributed in a predetermined spatial configuration;
- a housing cooling system arranged to provide cooling to the plurality of battery modules in the housing, wherein the housing cooling system has a plurality of states;
- a battery monitoring system comprising a memory and a hardware processor communicatively coupled to the memory, wherein the battery monitoring system is configured to receive input data from at least:
- said plurality of temperature sensors;
- said plurality of current sensors;
- battery module cooling systems of the plurality of battery modules with at least one parameter indicative of their respective states;
- said housing cooling system with at least one parameter indicative of its state;
- and
- one or more auxiliary inputs;
- wherein the hardware processor is configured to:
- process at least a part of said input data according to a predetermined model based on knowledge about the plurality of re-chargeable battery cells, the battery module cooling systems of the plurality of battery modules, the housing cooling system, and on said predetermined spatial configurations of the plurality of re-chargeable battery cells and the battery modules;
- generate an estimated temperature at a predetermined position within a battery cell or battery module in response to said predetermined model;
- determine a difference between said estimated temperature and a measured temperature at said predetermined position;
- and
- generate an output indicating if said difference exceeds a predetermined threshold.
A wind turbine system comprising:
- at least one wind turbine comprising a rotor blade system, an electric generator connected to be driven by the rotor blade system, a tower with a nacelle for housing the electric generator, and an electric output;
- and
- a battery system according to any of the preceding claims, wherein the electric output from the at least one wind turbine is connected to the battery system, so as to allow charging of at least one of the plurality of battery modules.
A method for monitoring a battery system of a plurality of battery modules with re-chargeable battery cells and each having a battery module cooling system, wherein the plurality of battery modules are spatially distributed in a predetermined spatial configuration in a housing with a housing cooling system with a plurality of states, the method comprising:
- executing a monitoring algorithm on a processor system;
- receiving input data from a plurality of temperature sensors arranged at respective positions of each battery module;
- receiving input data from a plurality of current sensors arranged to sense charge or discharge current at least at the re-chargeable battery cells;
- receiving input data from the battery module cooling systems with at least one parameter indicative of their respective states;
- receiving input data from the housing cooling system with at least one parameter indicative of its state;
- receiving input data from one or more auxiliary inputs;
- processing at least a part of said input data according to a predetermined model based on knowledge about the re-chargeable battery cells, the battery module cooling systems, the housing cooling system, and on said predetermined spatial configurations of the re-chargeable battery cells and the battery modules;
- generating an estimated temperature at a predetermined position within a battery cell or battery module in response to said predetermined model;
- determining a difference between said estimated temperature and a measured temperature at said predetermined position;
- and
- generating an output indicating if said difference exceeds a predetermined threshold.
Dependencies are inferred from the claim text.