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Lithium ion storage battery temperature combinational circuit model and parameter identification method thereof

A combined circuit and storage battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of not considering the influence of temperature on battery capacity, damage, errors, etc.

Active Publication Date: 2015-10-07
广西聚邦能源有限公司
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  • Application Information

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Problems solved by technology

If the battery is charged at a low temperature and discharged at a high temperature, there is a risk of overdischarging, causing irreversible damage to the battery
[0004] This battery model is not perfect, first of all, the model does not consider the influence of discharge rate
Second, the model does not consider the effect of temperature on battery capacity
It has a certain error compared with the actual battery characteristics, especially the influence of temperature on the battery

Method used

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  • Lithium ion storage battery temperature combinational circuit model and parameter identification method thereof
  • Lithium ion storage battery temperature combinational circuit model and parameter identification method thereof
  • Lithium ion storage battery temperature combinational circuit model and parameter identification method thereof

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Embodiment Construction

[0069] Attached below figure 2 Further explain the specific structure and model parameter identification method of the present invention. figure 1 It is a combined model of a lithium-ion battery.

[0070] Since the capacity of the battery is greatly affected by temperature, in order to reflect the dynamic characteristics of the battery more accurately, a temperature combination model was invented on the basis of the combination model, such as figure 2 shown. T(t) represents the ambient temperature of the battery at time t. C(T(t)) represents the relative capacity of the battery, which is affected by the ambient temperature. Set the capacitor voltage U SOC (t) ranges from [0,1], ie U SOC (t) is equivalent to the state of charge SOC of the battery, so the estimation of the model SOC is the U SOC (t) estimate. I d is flowing through the self-discharge resistor R d the self-discharge current, and setting R d It's only about time, not temperature. Ucocv(soc) is the sta...

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Abstract

The invention discloses a lithium ion storage battery temperature combinational circuit model including an energy balancing circuit and a voltage responsive circuit. The energy balancing circuit predicts the continuous operation time and charged state SOC of a battery, and the voltage responsive circuit stimulates the transient response of the battery, and elements of the circuit are variables and change continuously according to the change of the environment temperature and SOC. The parameter identification method of the lithium ion storage battery temperature combinational circuit model includes four steps of charged state and battery open-circuit voltage relation identification, battery capability and temperature relation identification, self-discharge resistance identification, and internal resistance and polarized parameter identification. The lithium ion storage battery temperature combinational circuit model and the parameter identification method thereof make the stimulation approximate to the real response of the storage battery at different temperatures and give guidance to battery state estimation, and have the advantages of distinct characteristic, visual construction, clear physical meaning, convenient parameter identification, and easy application in engineering.

Description

technical field [0001] The invention relates to an equivalent temperature combined circuit model for simulating the dynamic characteristics of the lithium-ion storage battery of an electric vehicle and introducing temperature influencing factors. In particular, it involves the parameter identification of the model, determining the relationship between battery open circuit voltage, battery capacity, ohmic internal resistance and temperature, and carrying out self-discharge resistance identification and polarization parameter identification. The invention is closer to the real response of the storage battery at different temperatures, and provides guidance for the state estimation of the battery. The invention belongs to the technical field of analog circuits and circuit simulation tests. Background technique [0002] Chen and Rincón-Mora proposed a battery equivalent circuit model—combined model, such as figure 1 shown. The model consists of two parts, the left half is cal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 袁慧梅何静韩相东
Owner 广西聚邦能源有限公司
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