Battery charger and method of charging batteries

Details Battery charger and method of charging batteries Battery charger and method of charging batteries

1996-08-16

1999-05-04

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell charging

With thermal condition detection

320152, H02J 704, H01M 1044

Patent

active

059007184

ABSTRACT:
A battery charger and method of charging a rechargeable battery which comprises charging the battery with an initial charging current and measuring and comparing the charging temperature to an initial temperature to identify a temperature factor which either identifies a need to lower the current or terminate the charging current. The temperature factor may be a temperature gradient .DELTA.T. The open circuit voltage may be monitored from the beginning or may begin when .DELTA.T is identified. V.sub.OCV is plotted with respect to time t elapsed to identify a point or points on the V.sub.OCV (t) curve, such as an inflection point in the dV.sub.OCV /dt data or a transition point in the d.sup.2 V.sub.OCV /dt.sup.2 which indicate the onset of overcharge. If the open circuit voltage V.sub.OCV of the battery is sampled from the beginning of charging the second order differential information should be ignored until a predetermined temperature gradient is realized. If a point indicating onset of overcharge is not recognized then charging is continued and the steps above are repeated until a point or points indicating onset of overcharge are identified. As a safeguard against overcharge, the inflection point on dV.sub.OCV /dt curve is utilized to indicate onset of overcharge even if the inflection point on the d.sup.2 V.sub.OCV /dt.sup.2 curve is not identified and the negative slope--dV.sub.OCV /dt is utilized to indicate onset of overcharge if the inflection point on the dV.sub.OCV /dt data is not identified.

REFERENCES:
patent: 3487284 (1969-12-01), Cady
patent: 3890556 (1975-06-01), Melling et al.
patent: 3911349 (1975-10-01), Seeley et al.
patent: 3911350 (1975-10-01), Swope
patent: 3953302 (1976-04-01), Rao et al.
patent: 4016473 (1977-04-01), Newman
patent: 4079303 (1978-03-01), Cox
patent: 4086525 (1978-04-01), Ibsen et al.
patent: 4139680 (1979-02-01), Schlaikjer
patent: 4345008 (1982-08-01), Breault
patent: 4385269 (1983-05-01), Aspinwall et al.
patent: 4388582 (1983-06-01), Saar et al.
patent: 4392101 (1983-07-01), Saar et al.
patent: 4414291 (1983-11-01), Breault
patent: 4554500 (1985-11-01), Sokira
patent: 4560937 (1985-12-01), Finger
patent: 4680528 (1987-07-01), Mikami et al.
patent: 4725784 (1988-02-01), Peled et al.
patent: 4746854 (1988-05-01), Baker et al.
patent: 4761487 (1988-08-01), Godshall
patent: 4806840 (1989-02-01), Alexander et al.
patent: 5017856 (1991-05-01), Johnson, Jr.
patent: 5057762 (1991-10-01), Goedken et al.
patent: 5119009 (1992-06-01), McCaleb et al.
patent: 5132626 (1992-07-01), Limuti et al.
patent: 5143799 (1992-09-01), Tsenter
patent: 5157320 (1992-10-01), Kuriloff
patent: 5166596 (1992-11-01), Goedken
patent: 5179335 (1993-01-01), Nor
patent: 5200689 (1993-04-01), Interiano et al.
patent: 5206578 (1993-04-01), Nor
patent: 5237257 (1993-08-01), Johnson et al.
patent: 5278000 (1994-01-01), Huang et al.
patent: 5290640 (1994-03-01), Icenter et al.
patent: 5291117 (1994-03-01), Rydborn
patent: 5296997 (1994-03-01), Betton et al.
patent: 5304915 (1994-04-01), Sanpei et al.
patent: 5304917 (1994-04-01), Somerville
patent: 5307000 (1994-04-01), Podrazhansky et al.
patent: 5321347 (1994-06-01), Chien
patent: 5329219 (1994-07-01), Garrett
patent: 5330861 (1994-07-01), Fetcenko et al.
patent: 5331268 (1994-07-01), Patino et al.
patent: 5343380 (1994-08-01), Champlin
patent: 5349281 (1994-09-01), Bugaj
patent: 5350995 (1994-09-01), Iketani
patent: 5350996 (1994-09-01), Tauchi
patent: 5352967 (1994-10-01), Nutz et al.
patent: 5365160 (1994-11-01), Leppo et al.
patent: 5369364 (1994-11-01), Renirie et al.
patent: 5376873 (1994-12-01), Toya
patent: 5391193 (1995-02-01), Thompson
patent: 5396163 (1995-03-01), Nor et al.
patent: 5408170 (1995-04-01), Umetsua et al.
patent: 5411537 (1995-05-01), Munshi et al.
patent: 5412306 (1995-05-01), Meadows et al.
patent: 5418084 (1995-05-01), Georgopoulos
patent: 5422559 (1995-06-01), Hall et al.
patent: 5432029 (1995-07-01), Mitate et al.
patent: 5432426 (1995-07-01), Yoshida
patent: 5432429 (1995-07-01), Armstrong et al.
patent: 5440221 (1995-08-01), Landau et al.
patent: 5442274 (1995-08-01), Tamai
patent: 5444353 (1995-08-01), Shinohara
patent: 5449996 (1995-09-01), Matsumoto et al.
patent: 5449997 (1995-09-01), Gilmore et al.
patent: 5460899 (1995-10-01), Charkey
patent: 5467005 (1995-11-01), Matsumoto et al.
patent: 5477125 (1995-12-01), Ettel et al.
patent: 5483165 (1996-01-01), Cameron et al.
patent: 5489836 (1996-02-01), Yuen
patent: 5498492 (1996-03-01), Hara et al.
patent: 5500583 (1996-03-01), Buckley et al.
patent: 5541492 (1996-07-01), Fernandez et al.
patent: 5541496 (1996-07-01), Simmonds
patent: 5550453 (1996-08-01), Bohne et al.
patent: 5563496 (1996-10-01), McClure
patent: 5583871 (1996-12-01), Simmonds et al.
patent: 5592069 (1997-01-01), Dias et al.
patent: 5627451 (1997-05-01), Takeda
patent: 5629604 (1997-05-01), Sengupta et al.
patent: 5633574 (1997-05-01), Sage
patent: 5635820 (1997-06-01), Park
patent: 5642032 (1997-06-01), Kokuga
patent: 5666039 (1997-09-01), Odaohara et al.
patent: 5686815 (1997-11-01), Reipur et al.
patent: 5701068 (1997-12-01), Baer et al.
patent: 5703465 (1997-12-01), Kinoshita et al.
patent: 5705915 (1998-01-01), Douglas et al.
patent: 5710501 (1998-01-01), Van Phuoc et al.
patent: 5729116 (1998-03-01), Tsenter
Damon W. Chu, "Tradeoffs in Implementing Intelligent Battery Management", Jul. 10, 1995, 6 pages.
David Freeman, "Freeing Portables from Battery Tyranny," Jul. 10, 1995, 6 pages.

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