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Lithium battery state-of-charge joint estimation method 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, measuring devices, etc., and can solve problems such as difficulty in accurately estimating SOC

Active Publication Date: 2021-03-05
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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  • Lithium battery state-of-charge joint estimation method based on temperature correction model
  • Lithium battery state-of-charge joint estimation method based on temperature correction model
  • Lithium battery state-of-charge joint estimation method 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 so as to solve the problem that the state-of-charge estimation error ofa battery management system of a hybrid electric vehicle is caused by temperature influence, wherein the method comprises the steps: firstly, selecting a certain power lithium battery, and establishing an equivalent circuit model to determine the system state and model parameters of online identification; then carrying out a constant-temperature constant-current charging and discharging experiment and an HPPC experiment on the power battery at different temperatures, and recording experiment data; establishing a power battery temperature correction model based on the experimental data; and finally, based on the established temperature correction model, an improved ampere-hour integral method and a self-adaptive particle filter algorithm, carrying out system online identification and SOC accurate estimation on the power battery in a wide temperature range. The model adopted by the method is combined with an equivalent circuit model, and SOC accurate estimation can be carried out on thework of the power lithium battery in a wide temperature range based on the temperature correction model.

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 ...

Claims

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Application Information

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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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