US 7,749,641 B2
Secondary lithium ion cell or battery, and protecting circuit, electronic device, and charging device of the sameGeneral
US 7,749,641 B2
Secondary lithium ion cell or battery, and protecting circuit, electronic device, and charging device of the same
Tech Center:
1700 Chemical and Materials Engineering
Examiner:
Patrick Ryan
Art Unit:
1795 Food, Analytical Chemistry, Sterilization, Biochemistry, Electrochemistry
Agent:
Inventors:
Xiaoping Ren; Jie Sun
Assignee:
Priority:
05/06/04
Filed:
09/28/02
Granted:
07/06/10
Expiration:
01/06/27
Abstract
The present invention provides a new method for improving capacity, average operating voltage and specific energy of a secondary lithium ion cell or battery. This method is achieved by means of properly adjusting the ratio between a positive material and negative material, which is calculated by theoretical specific energy, and properly increasing charge cut-off voltage. The present method can greatly increasing specific energy and average operating voltage of a secondary lithium ion cell without influence on recycle property of the cell. The present invention also provides a secondary lithium ion cell or battery practicing the method, a protecting circuit adapted for the secondary lithium ion cell or battery, a electronic device using said protecting circuit and said secondary lithium ion cell or battery, and a charging device for the secondary lithium ion cell or battery.
Cooperative Patent Classification (CPC)
H01H01M2010/4292H01MY02E60/10Y02E