Combined simulating evaluation method of state of health and state of charge of lithium battery

A state of charge, lithium battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of model uncertainty, not suitable for application scenarios, and not well adapted to different batteries, so as to ensure real-time Accuracy, the effect of improving the estimation accuracy

Active Publication Date: 2018-06-22
FUDAN UNIV
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Problems solved by technology

Literature [10] proposed an empirical model for the cycle life of lithium-ion batteries, but this model considered many physical factors of the battery, so it could not be well adapted to different batteries; similarly, literature [11] also gave a Mathematical model of lithium-ion battery capacity decay, but this model is an empirical model. For different batteries, the model has uncertainty and is not suitable for practical application scenarios

Method used

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  • Combined simulating evaluation method of state of health and state of charge of lithium battery
  • Combined simulating evaluation method of state of health and state of charge of lithium battery
  • Combined simulating evaluation method of state of health and state of charge of lithium battery

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Experimental program
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Embodiment Construction

[0068] 1. Construct an equivalent circuit model

[0069] What is used in the test experiment is a lithium-ion polymer cell LGABF1L18650 battery with a rated capacity of 3350mAh and a rated voltage of 3.7V. The model parameters need to be identified by some charge and discharge tests. All experiments were performed at 25 °C.

[0070] First of all, establish the SOC-OCV relationship, fully charge the battery with constant current-constant voltage charging method, and after standing for 1 hour, discharge the battery with a discharge rate of 0.6C. The battery is discharged for 120s in each cycle, and then statically Set for 720s, the sampling interval of the battery current and voltage is 1s, continuously cycle to the battery discharge cut-off voltage; then use the same current to charge the battery, the cycle method is the same as the discharge method, until the battery is charged to the charge cut-off voltage. According to the average of the measured charging and discharging d...

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Abstract

The invention belongs to the technical field of lithium battery health management, and particularly relates to a combined simulating evaluation method of the state of health and the state of charge ofa lithium battery. A lithium battery equivalent circuit is utilized to describe battery characteristics, and a describing means is provided for a hysteretic phenomenon existing in the relation of open circuit voltage and the state of charge; internal resistance of the battery is introduced to serve as a state variable, the state variable is correlated with the state of health of the battery defined from the aspect of the capacity and the internal resistance of the battery, and thus the current capacity of the battery is updated in real time by updating the internal resistance. In this way, ageing of the battery can be self-adapted, and the high describing precision is maintained all the time. Compared with an existing method, the combined simulating evaluation method can achieve real-timeonline capacity estimation which is difficult to implement by a traditional method, the real-time accuracy degree of the circuit equivalent model is guaranteed, and references are provided for the state of health and the state of charge of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium battery health management, and in particular relates to a combined simulation evaluation method for lithium battery health and state of charge. Background technique [0002] Due to the advantages of high energy density, low self-discharge rate and long life, lithium-ion batteries have been widely used in mobile electronic devices and power vehicles. But these advantages can only be guaranteed in a safe operating environment. Therefore, in order to ensure that the lithium battery can work in such an operating environment, it is necessary to manage the battery. On-line estimation of the internal state of lithium batteries is a prerequisite for battery management. The internal state of a lithium battery mainly refers to its state of charge (State of Charge, SOC) and state of health (State of Health, SOH). The former is used to indicate the current remaining battery power, and the latter is used to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/367G01R31/392
Inventor 朱丽群李旦张建秋
Owner FUDAN UNIV
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