Title:
BATTERY MANAGEMENT SYSTEM BATTERY MANAGEMENT SYSTEM
Document Type and Number:
WIPO Patent Application WO1996031933
Kind Code:
A3
Abstract:
A battery management system for management and control of a plurality of rechargeable batteries connected in series. A programmed central processing unit communicates with a plurality of battery modules and a bulk charger. Each of the battery modules includes a rechargeable battery, a sensor node including a plurality of battery sensors and a microcontroller that processes signals generated by the battery sensors, and a direct current charger. During a charging cycle the bulk charger provides a variable bulk charging current to the rechargeable batteries connected in series and each of the rechargeable batteries receive a charging current from individual direct current chargers positioned at each rechargeable battery. During the charging cycle, the voltage and temperature of the rechargeable batteries are monitored by the programmed central processing unit by means of the sensor nodes and the bulk charging current reduced by one half when any battery voltage reaches a predetermined clamping voltage. Once the bulk charging current is reduced to approximately 1 to 2 percent of the 3-hour discharge capacity for the rechargeable batteries, the bulk charger is turned off and the direct current chargers finish each battery charge independently.
Inventors:
BAER JOSE T
DAVIS BILL C
BLANYER RICHARD J
DAVIS BILL C
BLANYER RICHARD J
Application Number:
PCT/US1996/003024
Publication Date:
January 03, 1997
Filing Date:
March 06, 1996
Export Citation:
Assignee:
ELECTROSOURCE INC (US)
International Classes:
H02J7/00; (IPC1-7): H02J7/00
Domestic Patent References:
| WO1995000978A1 | 1995-01-05 |
Foreign References:
| DE3740331A1 | 1989-06-08 | |||
| US4553081A | 1985-11-12 | |||
| US4885523A | 1989-12-05 | |||
| US4709202A | 1987-11-24 | |||
| US5229704A | 1993-07-20 | |||
| DE2917114A1 | 1980-11-06 | |||
| US4238721A | 1980-12-09 | |||
| DE4216045A1 | 1993-11-18 | |||
| US4079303A | 1978-03-14 | |||
| US5250904A | 1993-10-05 | |||
| US4670703A | 1987-06-02 |
Other References:
SCHMIDT H ET AL: "THE CHARGE EQUALIZER A NEW SYSTEM TO EXTEND BATTERY LIFETIME IN PHOTOVOLTAIC SYSTEMS, U.P.S. AND ELECTRIC VEHICLES", 27 September 1993, INTERNATIONAL TELECOMMUNICATIONS ENERGY CONFERENCE. (INTELEC), PARIS, SEPT. 27 - 30, 1993, VOL. 2, PAGE(S) 146 - 151, SOCIETE DES ELECTRICIENS ET DES ELECTRONICIENS, XP000496211
Download PDF: