METHOD AND SYSTEM FOR EQUALIZING AND MATCHING LITHIUM SECONDARY BATTERIES

A method includes providing battery cells for secondary batteries. The battery cells are charged to a fixed voltage (Vc). The battery cells are laid aside in an open circuit for a preset self-discharge time period (t). A voltage (Vt) is measured after the period t for each battery cell. A voltage di...

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Hauptverfasser:	TANG Shengcheng, Cheng Dingbo, Zeng Shihua, Zeng Xiaoping
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY SYSTEMS FOR STORING ELECTRIC ENERGY
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Beschreibung
Zusammenfassung:	A method includes providing battery cells for secondary batteries. The battery cells are charged to a fixed voltage (Vc). The battery cells are laid aside in an open circuit for a preset self-discharge time period (t). A voltage (Vt) is measured after the period t for each battery cell. A voltage difference (ΔV) is determined for each battery cell, wherein ΔV=Vc−Vt. A self-discharge rate (ρ) is measured for each ΔV. A self-discharge current (Ic) is calculated during the period t, wherein Ic is a function of ρ. The Ic is curve-fitted to the ΔV for each battery cell to obtain an Ic−ΔV equation. The Ic is divided into h number of grades. The Ic−ΔV equation is utilized to determine h number of grades of ΔV associated with each grade of Ic. Battery cells are selected having a same grade of Ic and ΔV for matching.