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Lithium battery active equalization control method

A technology of active equalization and control methods, applied in electric vehicles, battery circuit devices, collectors, etc., can solve the problem of inaccurate SOC estimation

Active Publication Date: 2015-12-09
GUANGXI UNIVERSITY OF TECHNOLOGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium battery active equalization control method, which can solve the problem of inaccurate SOC estimation existing in the existing lithium battery equalization scheme

Method used

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  • Lithium battery active equalization control method

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Embodiment Construction

[0020] Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

[0021] figure 1 and figure 2 The lithium battery active balancing control device shown includes a DC / DC power module 1 and a main control unit 2, and the DC / DC power module 1 is connected to the main control unit 2; the main control unit 2 is respectively connected to the lithium battery active balancing module 3, and the voltage The detection module 5, the current detection module 6 and the display module 4 are connected.

[0022] Among them, the detection of the voltage and current of the lithium battery is carried out by the main control unit 2 controlling the voltage detection module 5 and the current detection module 6; the operation of the Uncented Kalman Filter (UKF for short) algorithm is completed by the main control unit 2; The control of the lithium battery is completed by the main control unit 2 controlling the active balancing module 3 of...

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Abstract

The invention discloses a lithium battery active equalization control method, and relates to the technical field of lithium batteries. The control method comprises the following steps: (1) a system is initialized, and a set value is preset; (2) the voltage and current of batteries are detected; (3) a digital-to-analog conversion module in a main control unit reads data detected by a voltage detection module and a current detection module and converts the data; (4) the main control unit performs UKF operation on the data after conversion and estimates SOC, and calculates the average SOC value after estimation is completed; and (5) the main control unit calculates the difference between the SOC of each single battery and the average SOC value, and if the difference is greater than the set value, the main control unit controls the duty ratio and opens a lithium battery active equalization module to actively equalize the SOC of the single battery until the difference between the SOC of the single battery and the average SOC value is smaller than the set value. By adopting the method, the problem that SOC estimation through the existing lithium battery equalization scheme is inaccurate can be solved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries; in particular, an active balancing control method for lithium batteries based on SOC balancing of lithium batteries. 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. Lithium-ion battery is the battery with the highest energy ratio so far. Its specific weight reaches 130 hours per kilogram, and the discharge voltage of a single battery is 3.6 volts, which is three times higher than that of nickel-cadmium batteries. In addition, lithium-ion batteries have small thermal effects, no memory effects, and higher charging efficiency than nickel-cadmium and nickel-hydrogen batteries. Howe...

Claims

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Application Information

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IPC IPC(8): H02J7/00
Inventor 刘胜永于跃赵振森李源
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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