U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Battery charger for charging a stack of multiple lithium ion battery cells

Patent 6121751 Issued on September 19, 2000. Estimated Expiration Date: Icon_subject March 11, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

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Low voltage power down logic control circuit
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Battery charge apparatus controlled by detecting charge current with constant charge voltage
Patent #: 5028860
Issued on: 07/02/1991
Inventor: Amano

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Inventor

Assignee

Application

No. 266510 filed on 03/11/1999

US Classes:

320/116SERIALLY CONNECTED BATTERIES OR CELLS

Examiners

Primary: Wong, Peter S.
Assistant: Tibbits, Pia

Attorney, Agent or Firm

International Class

H02J 007/00

Abstract

A battery charging apparatus for charging a stack of multiple lithium ion battery cells charges the stack by a combination of switched capacitance cell balancing and cell voltage monitoring to provide a charge cycle that starts with a nominally constant current charging and easily shifts to constant voltage taper charging.

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