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Rapid correction method for SOC (state of charge) estimation of energy storage lithium ion battery system

An energy storage battery and lithium-ion technology, which is applied in the field of rapid correction of SOC estimation of lithium-ion energy storage battery systems, can solve problems such as inaccurate SOC estimation, and achieve the effect of improving accuracy and precision, improving reliability and safety

Active Publication Date: 2014-09-17
DONGFANG ELECTRIC CORP LTD
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Problems solved by technology

[0004] The present invention aims to solve the problem of inaccurate estimation of SOC in the existing lithium-ion energy storage battery system, and provides a method for fast and targeted correction of SOC estimation, which can carry out pertinent, operable and practical Calibration can improve the accuracy and precision of SOC estimation, and improve the reliability and safety of the lithium-ion energy storage battery system

Method used

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  • Rapid correction method for SOC (state of charge) estimation of energy storage lithium ion battery system
  • Rapid correction method for SOC (state of charge) estimation of energy storage lithium ion battery system
  • Rapid correction method for SOC (state of charge) estimation of energy storage lithium ion battery system

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Embodiment Construction

[0045]The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0046] Correction factor obtained from a quick test lambda The introduction of the SOC is revised, and the revision method is as follows:

[0047] when charging, When discharging,

[0048] Or: while charging, When discharging,

[0049] In the formula, C n is the rated capacity of the system, I Charge and discharge current for the battery.

[0050] Such as figure 1 As shown, the above correction factor lambda 1 and lambda 2 Obtained by the following steps:

[0051] a. Start;

[0052] b. Judging the length of the lithium-ion energy storage battery system’s shelving time or continuous operation time and the temperature change of the environment where the system is located, if the shelving time is less than the set time t0, the running time is less than...

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Abstract

The invention discloses a rapid correction method for the SOC (state of charge) estimation of an energy storage lithium ion battery system. The method is characterized by comprising the steps of performing rapid testing to obtain correction coefficients lambda1 and lambda2 of an SOC; correcting the SOC by introducing the correction coefficients lambda1 and lambda2. According to the method, the system is rapidly tested to obtain the correction coefficients for a current state of the system, and the coefficients are used for correcting the SOC, so that the method is pertinent, operable and practical, the SOC estimation accuracy and precision can be improved, and the using reliability and safety of the energy storage lithium ion battery system are improved.

Description

technical field [0001] The invention relates to the field of lithium-ion energy storage battery systems, and more specifically, relates to a method for rapidly correcting SOC estimation of a lithium-ion energy storage battery system. Background technique [0002] Energy storage battery systems are an integral part of the development of smart grids, renewable energy access, distributed generation, microgrids, and electric vehicles. The huge development prospects in these fields have also created unprecedented development opportunities for energy storage battery systems, among which lithium-ion energy storage battery systems are highly respected. As we all know, the energy storage battery system, as an energy-containing system, needs to accurately monitor the system state to ensure its safety and reliability throughout its life cycle. Among them, the system state of charge (State of Charge, SOC) is an important parameter. There are many methods for SOC estimation at present,...

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Application Information

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IPC IPC(8): H01M10/44G01R31/36
CPCH01M10/4207H01M10/4285Y02E60/10
Inventor 吴仕明郑威李明科王珂李玉龙
Owner DONGFANG ELECTRIC CORP LTD
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