Super-capacitor energy storage and transfer-based active equalization system and method for lithium battery pack

A technology of active balancing and capacitive energy storage, applied in charge balancing circuits, electric vehicles, secondary batteries, etc., it can solve the problems of insufficient battery balancing and poor balancing effect, to ensure safety and stability, and to achieve hardware interlocking , with the effect of strong load capacity

Active Publication Date: 2016-09-14
WUHAN UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Power transfer only uses simple inductance or capacitance, and the balance effect is not good
[0007] Generally speaking, in recent years, battery management system technology has been greatly improved, and many aspects have entered the stage of practical application, but battery equalization is still not perfect, and further research is needed

Method used

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  • Super-capacitor energy storage and transfer-based active equalization system and method for lithium battery pack
  • Super-capacitor energy storage and transfer-based active equalization system and method for lithium battery pack
  • Super-capacitor energy storage and transfer-based active equalization system and method for lithium battery pack

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] The present invention takes 16 large-capacity lithium iron phosphate batteries connected in series as the research object. The single-cell capacity is 40AH, the nominal voltage is 3.2V, the charge cut-off voltage is 3.4V, and the discharge cut-off voltage is 2.7V. The overall structure diagram is as follows figure 1 shown.

[0027] Such as figure 2 As shown, the positive and negative poles of the external power supply terminal of the total battery pack maintain independent output. The equalization leads are led out from the two poles of each single battery respectively, and the on-off of each equalization lead-out line is turned on or off by MOSFET, and the switch array is arranged as figure 2 . The other ends of all the MOSFETs connected to the negative poles of the cells are connected together to form a gate bus V-, and the other ends of ...

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Abstract

The invention provides a super-capacitor energy storage and transfer-based active equalization system and method for a lithium battery pack. The active equalization system comprises an equalization main controller, a switch array, a two-way DC/DC, a super-capacitor, a current detection and power calculation device, a 16-bit decoder and a drive circuit, wherein the equalization main controller obtains a single battery voltage inspection value as an equalization state basis and any to-be-equalized battery is gated by the switch array to be connected to an equalization bus; the preceding stage of the full-bridge two-way DC/DC with an adjustable ratio is connected with the equalization bus and the backward stage is connected with the super-capacitor; the power of the equalization loss is calculated through the current detection and power calculation device; the equalization main controller achieves charging for the super-capacitor by a high-power battery through the two-way DC/DC; and the super-capacitor stores the power and then discharges a low-power battery through the two-way DC/DC until the equalization state. The power is stored and transferred through the super-capacitor; active equalization for the lithium battery pack is achieved; and the super-capacitor energy storage and transfer-based active equalization system has an important significance for prolonging of the lifetime of the lithium battery pack.

Description

technical field [0001] The invention belongs to the technical field of battery energy balance, in particular to an active balance system and method for lithium battery packs based on supercapacitor energy storage and transfer. Background technique [0002] At present, new energy vehicles are becoming a global trend, and the market share of pure electric vehicles and hybrid electric vehicles is gradually increasing, while fossil fuel vehicles are gradually decreasing. Power energy is the core component of new energy vehicles. New energy vehicles that use electric energy in vehicles have many advantages that traditional petrochemical energy vehicles cannot match. [0003] Lithium battery is the best power storage device at present. It has the advantages of high energy density, high voltage, no pollution, long cycle life, and no memory effect. Lithium battery technology is currently widely used and mature, and it is very suitable for application in electric vehicle power system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/42H01M10/44
CPCH01M10/4207H01M10/441H02J7/0014H02J7/0036Y02E60/10
Inventor 谢长君程哲全书海江逸洵石嵩别业伟石英黄亮陈启宏张立炎
Owner WUHAN UNIV OF TECH
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