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Battery pack equalization method based on sliding mode control

A technology of battery balancing and balancing method, applied in charge balancing circuit, battery circuit device, arrangement of multiple synchronous batteries, etc., can solve problems such as hidden danger of overcharged battery, premature termination of discharge, capacity reduction, etc., to achieve scalability Good, good portability, obvious effect of modularization

Active Publication Date: 2017-10-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Unbalanced battery packs can cause the following hazards: premature battery degradation due to overvoltage; safety hazards of overcharged batteries; reduced capacity due to premature cessation of charging; premature termination of discharge

Method used

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  • Battery pack equalization method based on sliding mode control
  • Battery pack equalization method based on sliding mode control
  • Battery pack equalization method based on sliding mode control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0089] An example is used below to prove the effectiveness of the lithium battery equalization method proposed by the present invention.

[0090] 1. Experimental equipment

[0091] 1) Battery:

[0092] Experiments were performed using a battery pack consisting of four NCR 18650 (MH12210-3400mAh) lithium batteries, as figure 2 shown. After several rounds of charging and discharging experiments, the electric capacity of these batteries is about 3.1Ah and Cb=3.1×3600. and It can be calculated as 3.23 and 0.8948. The relevant parameters of the model are:

[0093] R0i=0.206Ω, Rsi=0.0158Ω,

[0094] Csi=12340F, Rfi=0.01509Ω, and Cfi=1584F.

[0095] 2) Two-way cuk converter:

[0096] Such as figure 1 As shown, a 4-element serial battery pack requires a battery pack containing 3 bi-directional cuk converters. Select the relevant accessories parameters as follows:

[0097] Li1=Li2=100μH, C=470μF

[0098] The MOSFET tube of the NTD6416AN-1G model is driven by a PWM wave sig...

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Abstract

The invention discloses a battery pack equalization method based on sliding mode control. A special battery equalization topological structure is designed according to the disequilibrium situation of series battery packs; a mathematical model is established for the battery equalization topological structure, and a battery equalization system mathematical model formed by the battery equalization topological structure and the series battery packs together is established; and equalization control is performed by using a sliding mode controller through combination of the battery equalization system mathematical model so that equalization processing between all the batteries in the series battery packs can be realized. Battery equalization can be rapidly performed by the method so that the energy can be effectively saved and the battery life can be enhanced.

Description

technical field [0001] The invention relates to a battery algorithm, in particular to a method for equalizing battery packs based on sliding mode control. Background technique [0002] Energy conservation and environmental protection have become the goals of China and the world. Among them, the wide application of battery packs has become a symbol of the times. [0003] Cell imbalance is common in battery systems and is an important issue for battery system lifetime. It is caused by two main categories, which are: internal sources consisting of manufacturing variance of physical volume, i.e. variance in internal impedance and self-discharge rate differences, and external sources, such as thermal differences in packaging. The battery system of balancing technology is especially important in lithium batteries, because without it, the battery will be overcharged, undercharged, or even overdischarged. [0004] Unbalanced battery packs can cause the following hazards: prematur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0019
Inventor 陈剑欧阳权郭宣宏郑剑
Owner ZHEJIANG UNIV
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