Method for charging a lithium ion battery by increasing a charge limit voltage to compensate for internal battery voltage drop
First Claim
1. A method for charging a lithium ion battery comprising the steps of:
- charging the lithium ion battery only at a constant current; and
stopping the charging of the lithium ion battery when the lithium ion battery is charged to a charge limit voltage U at the constant current, characterized in that the charge limit voltage between two poles of the lithium ion battery is set to be U=U0+(U0−
Us)=2U0−
Us, whereinU0 is a standard charge cutoff voltage of the lithium battery used by a low rate constant current-constant voltage charging mode;
Us is a stabilized voltage to which an oven-circuit voltage of the lithium ion battery falls back after the voltage of the lithium ion battery is charged to U0 at the constant current.
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Accused Products
Abstract
The present invention provides a quick charge method belonging to the field of the battery and particularly relates to a quick charge method for lithium ion battery and polymer lithium ion battery. During a battery is being charged, the battery stops charging when the battery is charged to a charge limit voltage, and the charge limit voltage between two poles of the battery is set to be U=2U0−Us, and Us is a stabilized voltage which the voltage of the battery falls back to after the voltage of the battery is charged to U0 at a constant current, U0 is a standard charge cutoff voltage used by a low rate constant current-constant voltage charging mode which is normally accepted by the industries, and the stabilized voltage Us is selected as follows: timing begins when the battery stops charging at the constant current, and from a certain time segment, when the drop of an open-circuit voltage of the battery is less than a certain value within the certain time segment, which means that the voltage of the battery is stable, and a voltage corresponding to the first time point of this time segment is selected as the stabilized voltage Us of the battery.
19 Citations
4 Claims
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1. A method for charging a lithium ion battery comprising the steps of:
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charging the lithium ion battery only at a constant current; and stopping the charging of the lithium ion battery when the lithium ion battery is charged to a charge limit voltage U at the constant current, characterized in that the charge limit voltage between two poles of the lithium ion battery is set to be U=U0+(U0−
Us)=2U0−
Us, whereinU0 is a standard charge cutoff voltage of the lithium battery used by a low rate constant current-constant voltage charging mode; Us is a stabilized voltage to which an oven-circuit voltage of the lithium ion battery falls back after the voltage of the lithium ion battery is charged to U0 at the constant current. - View Dependent Claims (2, 3, 4)
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Specification