A method for estimating the state of charge and state of health of power batteries with multiple time scales

A multi-time scale, power battery technology, applied in the direction of measuring electricity, measuring electrical variables, testing electrical devices in transportation, etc., can solve the problems of inability to obtain battery health status, slow parameter changes, large amount of calculation, etc., to reduce computing power. Quantity, good joint estimation, and high estimation accuracy

CN106772067BActive Publication Date: 2018-12-28BEIJING INSTITUTE OF TECHNOLOGYGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-12-28

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Abstract

The present invention relates to a method for estimating the state of charge and the state of health of a power battery by using multi-time scale IAPF (Improved Adaptive Particle Filtering). According to the method, preparatory work is performed, namely, a capacity-SOC(state of charge)-OCV (open-circuit voltage) three-dimensional response surface is established; the multi-time scale IAPF algorithm is adopted to obtain the parameter estimation values of a power battery system based on a macroscopic time scale and to estimate of the state of the system based on a microscopic time scale; and the characterization quantities of an SOC (state of charge) and an SOH (health state) are proposed to estimate the state of charge and health state of the power battery; and a multi-time scale-based power battery parameter and state combined estimation method can be formed; and therefore, precise combined estimation of the charge of state and available capacity of the power battery under uncertain application environments can be realized, estimation results are more stable and reliable in a full work cycle, and the calculation quantity of a BMS (battery management system) can be decreased.
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Description

Technical field:

[0001] The invention relates to the technical field of power battery management, in particular to the field of vehicle power battery system parameter identification, charge state and health state estimation. Background technique:

[0002] In the previous patent application CN201610375853.4, a joint estimation method for jointly estimating the state of charge SOC and parameters of the power battery was proposed for the first time. The HF algorithm was used for online parameter identification, and the UKF algorithm and the results of the aforementioned online parameter identification were used for online SOC estimation. The implementation estimation method targets the real-time parameter update and state estimation of the system.

[0003] However, in the above method, the parameters are updated in real time according to the collected data, but the parameters are a slowly changing process, while the state can be considered as a fast real-time changing process, ...

Examples

Embodiment Construction

[0037] The power battery system designed by the present invention includes a single power battery or a grouped power battery system.

[0038] A multi-time-scale based joint estimation method of state of charge (hereinafter referred to as SOC) and state of health (hereinafter referred to as SOH) of a power battery system described in the present invention is shown in the attached figure 1 shown.

[0039] The system charge state of the present invention refers to a system index that changes from time to time, that is, battery SOC. The health status of the system refers to the slower system indicators relative to the change of the state of charge, such as battery capacity and battery model parameters, which hardly change during a full charge and discharge process. Unless otherwise specified, the following systems of the present invention refer to the power battery system, and the state of charge of the system preferably corresponds to the SOC of the battery system. The system ...