The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 01, 2017
Filed:
Jan. 12, 2017
Guangzhou Fullriver Battery New Technology Co., Ltd., Guangzhou, CN;
Shengcheng Tang, Guangzhou, CN;
Shihua Zeng, Guangzhou, CN;
Dingbo Cheng, Guangzhou, CN;
Xiaoping Zeng, Guangzhou, CN;
Guangzhou Fullriver Battery New Technology Co., Ltd., Guangzhou, CN;
Abstract
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.