Patent ID: 8018203

Claim:
A control system of a secondary battery being capable of supplying and receiving an electric power to and from a load, wherein said secondary battery includes: first and second electrodes including an active material having a predetermined material present in a solid state, and an ion conductor arranged between said first and second electrodes for transmitting said predetermined material in an ionized form between said electrodes; and said control system comprises: a battery state estimating unit successively calculating a state estimation value indicating a battery state according to a battery model allowing dynamic estimation of the internal state of said secondary battery based on a value sensed by a sensor arranged at said secondary battery, a battery information generating unit producing battery information for restricting charge/discharge of said secondary battery based on said state estimation value calculated by said battery state estimating unit, and a load control unit for producing an operation command for said load to avoid overcharge and overdischarge of said secondary battery in view of said battery information produced by said battery information generating unit based on an operation request to said load; and said battery state estimating unit includes: a first model unit for estimating an electrochemical reaction of said predetermined material at an interface between said active material and said ion conductor in each of said electrodes, a second model unit for estimating a concentration distribution of said predetermined material in each of said electrodes based on a diffusion equation, a third model unit for estimating an ion concentration distribution of said predetermined material in said ion conductor based on a diffusion equation, a fourth model unit for estimating a potential distribution according to a current distribution caused in each of said electrodes and said ion conductor by a reaction current according to said electrochemical reaction, and a boundary condition setting unit for setting a boundary condition at said interface of said diffusion equation used in said second model unit based on a predetermined relational expression between a time differentiation of a concentration of said predetermined material and said reaction current.