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A joint estimation method for state of charge of lithium battery based on temperature correction model

A state of charge and model correction technology, which is applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as difficult and accurate estimation of SOC, and achieve the effects of avoiding error accumulation, simple model, and low algorithm complexity

Active Publication Date: 2021-11-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Changes in the temperature of the power battery will cause changes in parameters such as the actual discharge capacity of the battery, making it difficult to estimate the SOC accurately. Therefore, it is necessary to fully consider the temperature characteristics of these parameters when estimating the SOC

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  • A joint estimation method for state of charge of lithium battery based on temperature correction model
  • A joint estimation method for state of charge of lithium battery based on temperature correction model
  • A joint estimation method for state of charge of lithium battery based on temperature correction model

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Embodiment Construction

[0105] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0106] This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.

[0107] The invention discloses a method for estimating the state of charge of a lithium battery based on a temperature correction model, comprising the following steps:

[0108] Step S1), select the power battery to be tested, establish a state equation based on a dual polarization (DP) equivalent circuit model, and determine its system state and model parameters for online identification;

[0109] Step S2), performing a constant current pulse charge and discharge experiment and a mix...

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Abstract

The invention discloses a method for estimating the state of charge of a lithium battery based on a temperature correction model, aiming at the problem that the battery management system of a hybrid electric vehicle causes a state of charge estimation error due to the influence of temperature. Then, the power battery is subjected to constant temperature and constant current charge-discharge experiments and HPPC experiments at different temperatures to record the experimental data; then, the power battery temperature correction model is established based on the experimental data; finally , based on the established temperature correction model, the improved ampere-hour integration method and the adaptive particle filter algorithm, the power battery can be systematically identified online and SOC accurately estimated in a wide temperature range. The model adopted in the present invention is combined with the equivalent circuit model, and based on the temperature correction model, the SOC can be accurately estimated for the operation of the power lithium battery in a wide temperature range.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to a method for jointly estimating the state of charge of a lithium battery based on a temperature correction model. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles (EV) and hybrid electric vehicles (HEV) due to their high energy density, stable discharge and environmental friendliness. For hybrid electric vehicles, whether it is the estimation of the remaining mileage and the analysis of path planning, or the energy management strategy formulation of the hybrid system, it all depends on the state of charge estimation of the power battery system. Therefore, state supervision of lithium batteries requires an effective battery management system (BMS) to provide accurate information about the state of the battery, not only for vehicle control strategies, but also to maintain vehicle safety, efficiency, and battery life. The state of ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/367G01R31/374G01R31/388
CPCG01R31/367G01R31/374G01R31/388
Inventor 颜伸翔王春燕李琳赵万忠施帅朋冯健胡犇何鹏张自宇王一松章波吴子涵
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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