Fuzzy-PI control based active equalization control method for lithium battery

A technology of active equalization and control method, applied in charge equalization circuits, electric vehicles, battery circuit devices, etc., can solve the problems of long equalization time, energy waste, unstable equalization criteria, etc., to avoid damage and reduce energy loss. Effect

Active Publication Date: 2016-08-17
柳州特来电新能源有限公司 +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium battery active equalization control method based on fuzzy-PI control, which can solve the problem of long e...

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  • Fuzzy-PI control based active equalization control method for lithium battery
  • Fuzzy-PI control based active equalization control method for lithium battery
  • Fuzzy-PI control based active equalization control method for lithium battery

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Embodiment Construction

[0013] Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

[0014] figure 1 The steps of the lithium battery active equalization control method shown are: 1), detect the charge and discharge current signal of the battery pack in series and the terminal voltage of each single cell, and use the UKF algorithm to estimate the SOC value of each single cell;

[0015] 2), assuming that the battery pack is n cells connected in series, the average SOC of the battery pack SOC difference of each cell ΔSOC is the maximum SOC difference of the single battery in the battery pack;

[0016] 3) When ΔSOC ≥ the set value, start the fuzzy controller 1, and the fuzzy controller 1 takes the average and the difference ΔSOC as input, and the mean After performing fuzzy operation with the difference ΔSOC, an accurate equalization current maximum value I can be obtained max The output, through the PI controller 2, the execution ...

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Abstract

The invention discloses a fuzzy-PI control based active equalization control method for a lithium battery, and relates to the technical field of a lithium battery. The control method comprises the steps of 1) detecting the charging-discharging current signal of a series-wound battery pack and the end voltage of each single battery, and estimating the SOC (state of charge) value of each single battery by a UKF algorithm; 2) setting that the battery pack consists of n single batteries connected in series, the SOC average value of the battery pack is a formula which is as shown in the specification, and the SOC difference value of the single batteries is a formula which is as shown in the specification; when <delta>SOC is greater than or equal to the set value, starting a fuzzy controller, wherein the fuzzy controller takes the average value which is a formula as shown in the specification and the difference value <delta>SOC as the input, carries out fuzzy calculation on the average value which is a formula as shown in the specification and the difference value <delta>SOC to obtain an accurate equalizing current maximum value Imax, and outputs the Imax to a PI controller and then to a controlled object through an execution unit. The problems of long equalization time, waste of energy, shortened service life when high electric energy utilization ratio is achieved, impossibility of ensuring equalization efficiency and precision, and unstable equalization judgment exiting in the current lithium battery equalization method can be solved by the fuzzy-PI control based active equalization control method.

Description

technical field [0001] The invention relates to the technical field of lithium batteries; in particular, an active equalization control method based on fuzzy-PI control for lithium battery equalization. Background technique [0002] With the development of lithium battery technology and more and more attention paid to energy conservation and environmental protection, the application fields of lithium batteries are becoming wider and wider, such as portable electronic products, electric vehicles and solar power generation systems and other new energy fields. In order to meet the power drive requirements of electrical devices, the voltage level is usually increased by connecting batteries in series. However, the existing technology cannot guarantee the consistency of the relevant battery parameters of each single battery, especially the consistency of the state of charge (SOC) of each single battery. Reducing the SOC difference of each single battery through the equalization ...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0016
Inventor 刘胜永于跃黄俊华王建超雷贺鈞
Owner 柳州特来电新能源有限公司
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