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    • 9. 发明申请
    • DEVICE ESTIMATING A STATE OF A SECONDARY BATTERY
    • 设备估计二次电池状态
    • US20100085057A1
    • 2010-04-08
    • US12447715
    • 2008-03-07
    • Yuji NishiTakeshi TakemotoNobuyasu HagaTetsuya Fuchimoto
    • Yuji NishiTakeshi TakemotoNobuyasu HagaTetsuya Fuchimoto
    • G01N27/27
    • G01R31/3651G01R31/3624H01M10/44H01M10/48
    • A diffusion estimation unit follows a diffusion equation in an active material that is represented by a polar coordinate to estimate a distribution in concentration of lithium in the active material. An open circuit voltage estimation unit obtains an open circuit voltage in accordance with a local SOC(θ) based on a concentration of lithium obtained at an interface of the active material as estimated by the diffusion estimation unit. A current estimation unit uses a battery's voltage measured by a voltage sensor, the estimated open circuit voltage, and a parameter value that is set for the battery by a battery parameter value setting unit, and follows a voltage-current relationship model expression simplified from an electrochemical reaction expression to estimate the battery's current density. A boundary condition setting unit sequentially sets a boundary condition for the diffusion equation of the diffusion estimation unit for the active material's interface, as based on the battery's estimated current density. Thus a battery model that allows an internal state to be estimated based on an electrochemical reaction dynamically and can also achieve an alleviated operating load can be used to estimate a state of a secondary battery.
    • 扩散估计单元遵循由极坐标表示的活性材料中的扩散方程,以估计活性材料中锂浓度的分布。 开路电压估计单元基于通过扩散估计单元估计的在活性物质的界面处获得的锂的浓度,根据本地SOC(“thetas”)获得开路电压。 当前估计单元使用由电压传感器测量的电池电压,估计的开路电压和由电池参数值设置单元为电池设置的参数值,并且遵循简化的电压 - 电流关系模型表达式 电化学反应表达式来估计电池的电流密度。 边界条件设定部基于电池的推定电流密度,依次设定活性物质界面的扩散估计部的扩散方程的边界条件。 因此,可以使用允许基于电化学反应动态地估计内部状态并且还可以实现减轻的操作负载的电池模型来估计二次电池的状态。