| US 7,579,811 B2 | ||
| Battery pack, battery protection processing apparatus and control method thereof | ||
| Hideyuki Sato, Chiba (Japan); Yukio Tsuchiya, Kanagawa (Japan); Ryuji Nakamichi, Kanagawa (Japan); Osamu Nagashima, Tokyo (Japan); and Toshihiro Koide, Tokyo (Japan) | ||
| Assigned to Sony Corporation, Tokyo (Japan); and Maxim Japan Co., Ltd., Tokyo (Japan) | ||
| Filed on Nov. 12, 2004, as Appl. No. 10/987,927. | ||
| Claims priority of application No. 2003-385372 (JP), filed on Nov. 14, 2003. | ||
| Prior Publication US 2005/0134230 A1, Jun. 23, 2005 | ||
| Int. Cl. H02J 7/00 (2006.01) | ||
| U.S. Cl. 320—134 [320/132; 320/136; 320/162; 324/427; 324/433] | 17 Claims |
| 1. A battery pack which uses a software control to implement a secondary battery protection function, the battery pack comprising:
discharge current cutoff means for selectively cutting off a discharge current in the secondary battery;
charge current cutoff means for selectively cutting off a charge current in the secondary battery;
voltage detection means for digitizing and outputting a voltage between a positive electrode and a negative electrode of the
secondary battery;
protection process means for, based on at least an output voltage value from the voltage detection means, determining a state
of the secondary battery out of overcharge, normal operation, and over-discharge states and, according to a determined state,
controlling operations of the discharge current cutoff means and the charge current cutoff means,
wherein specified threshold values needed for a startup state are stored in an active software memory which is read immediately
after the startup of the protection process means; and
overcurrent detection means for providing control to enable the discharge current cutoff means in preference to the protection
process means when the secondary battery is determined to be in an overcurrent state based on a charge and discharge current
size of the secondary battery.
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