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Apparatus for estimating battery parameters and estimation method

A battery parameter and battery technology, applied in battery circuit devices, circuit devices, measuring devices, etc., can solve the problem of complex implementation of equivalent circuit models of resistors and capacitors, deviation from actual values, and deviation of estimated values ​​of simplified circuit equivalent models, etc. problems, to achieve highly accurate state of charge and state of health, highly accurate estimation

Active Publication Date: 2016-11-23
CALSONIC KANSEI CORP +2
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Problems solved by technology

[0017] However, the present inventors, through their experiments and measurements, found that the values ​​estimated by the above conventional methods may deviate significantly from actual values, and for example, parameters such as resistance values ​​may be taken from unrealistic negative values
[0018] This may be due to the complex chemistry of battery power, which leads to a bias in the estimates in the simplified circuit equivalent model
[0019] However, the equivalent circuit model with more resistors and capacitors implements complex operations, and therefore, is extremely difficult to use for real processing

Method used

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  • Apparatus for estimating battery parameters and estimation method
  • Apparatus for estimating battery parameters and estimation method
  • Apparatus for estimating battery parameters and estimation method

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Embodiment approach 1

[0064] Hereinafter, a battery parameter estimation device according to Embodiment 1 will be described with reference to the drawings.

[0065] The battery parameter estimating device according to Embodiment 1 is used for vehicles such as electric vehicles, hybrid electric vehicles, and the like. These vehicles include: an electric motor for driving the vehicle; a battery; and a controller for controlling power supply (discharging) to the electric motor, regenerative braking energy from the electric motor during braking, and power recovery (charging) to the battery from an off-board charging device ).

[0066] The charge / discharge current flowing to / from the battery changes the internal state of the current. Therefore, the internal state is monitored and estimated by the battery parameter estimation device. By this, necessary information such as remaining battery power is acquired.

[0067] Such as figure 1 As shown in , the battery parameter estimation device for estimatin...

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Abstract

A device for estimating battery parameters is provided, so that the accuracy of estimating parameters of an equivalent circuit model of the battery can be improved, and it is accomplished through simple mathematical operations. The device for estimating parameters of a battery (1) includes: an equivalent circuit model (4A) of the battery having resistance and capacitor as parameters; a logarithmic transformation parameter estimation unit (4B) using the The logarithmically transformed parameter values ​​are used as state variables, and the logarithmically transformed values ​​of the parameters are sequentially estimated from the state equation and the output equation through the Kalman filter (41), which is done based on the detected charging / discharging current and terminal voltage; and an inverse log transformation unit (4C) for obtaining estimated parameter values ​​corresponding to the inverse logarithm of these values ​​from the estimated log transformed parameter values.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of priority from Japanese Patent Application No. 2012-223002 filed on October 5, 2012, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a device for estimating battery parameters (battery parameter estimating device) capable of sequentially estimating parameters of a battery equivalent battery model by using a Kalman filter, and also relates to an estimation method of the battery parameter estimating device. Background technique [0004] The estimating device described in Patent Document 1 stated below is referred to as a conventional estimating device for estimating an internal state, parameters, and the like of a battery. [0005] The estimating means for estimating parameters and the like of the battery detects the charging / discharging current and terminal voltage of the battery, and based on the inputs th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36H01M10/48H02J7/00
CPCH01M10/48G01R31/392G01R31/367G01R31/3842Y02E60/10H02J7/0048H02J7/005G01R31/382G01R31/3648
Inventor 马场厚志足立修一丸田一郎
Owner CALSONIC KANSEI CORP