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Power lithium battery and charging method of pre-charging stage of series-connected group thereof

A charging method and lithium battery technology, which are applied in secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve the problems of not considering the difference of lithium batteries, shortening the service life of lithium battery series groups, and damage to lithium batteries , to achieve the effect of reducing damage, prolonging service life and overcoming damage

Inactive Publication Date: 2012-09-05
ZHANGJIAGANG RUINENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the current charger charges the lithium batteries connected in series, that is, the lithium battery series group, the difference between the lithium batteries in the series group is not considered, but it is charged as a whole, so that the part in the series group The lithium battery is damaged due to excessive charging, which greatly shortens the service life of the lithium battery series group

Method used

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  • Power lithium battery and charging method of pre-charging stage of series-connected group thereof
  • Power lithium battery and charging method of pre-charging stage of series-connected group thereof

Examples

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Embodiment 1

[0014] The charging method of the power lithium battery precharge stage of the present invention, its step is: with the constant current I of constant current stage c As a benchmark, it is usually 0.25~0.5C of the battery capacity, so that the charging current in the constant current stage is the constant current I c Between 10 and 20 amps, here select 10 amps as the constant current, take the voltage target value of the lithium battery minus 1 volt as the initial voltage, the rated value of the lithium iron phosphate battery is 3.2 volts, and its voltage target value is 3.6 V, so its initial voltage is 2.6 volts; as figure 1 As shown in the charging current line 1 and charging voltage line 2, first use 10% I c That is, 1 ampere as the initial current I 0 During the entire pre-charging stage, the charging voltage of the lithium battery, that is, the voltage at both ends of the lithium battery during charging, is regularly sampled according to a cycle of 5 milliseconds. When ...

Embodiment 2

[0016] The charging method of the power lithium battery precharge stage of the present invention, its step is: with the constant current I of constant current stage c As a benchmark, it is usually 0.25~0.5C of the battery capacity, so that the charging current in the constant current stage is the constant current I c Between 10 and 20 amps, here select 20 amps as the constant current, take the voltage target value of the lithium battery minus 1 volt as the initial voltage, the rated value of the lithium iron phosphate battery is 3.2 volts, and its voltage target value is 3.6 V, so its initial voltage is 2.6 volts; as figure 1 As shown in the charging current line 1 and charging voltage line 2, first use 10% I c i.e. 2 Amps as the initial current I 0 During the entire pre-charging stage, the charging voltage of the lithium battery, that is, the voltage at both ends of the lithium battery during charging, is regularly sampled according to a cycle of 180 milliseconds. When the ...

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Abstract

The invention discloses a charging method of a pre-charging stage of a power lithium battery capable of reducing the damage of lithium battery materials, which comprises the following steps of: using constant current Ic in the constant current stage as a reference; using a voltage target value of the lithium battery subtracting 1V as initial voltage; firstly charging by using the current of less than 0.3Ic as the initial current I0, periodically sampling the charging voltage of the lithium battery in the whole pre-charging stage in the whole pre-charging stage, always maintaining the initial current when the charging voltage of the lithium battery is no more than the initial voltage; enabling the charging current to be equal to I0+2(Ic-I0)*delta V / 1 volt when the difference delta V acquired by subtracting the initial voltage through the charging voltage of the battery is no less than K until the charging current reaches the constant current Ic. The invention also discloses a charging method of the pre-charging stage of the series-connected group of the power lithium battery, which comprises the steps of: respectively sampling the voltage of each lithium battery; selecting a minimum value in the voltage value acquired by sampling to calculate the charging current as the charging current of each lithium battery. The invention is mainly used for iron-phosphate-based lithium batteries.

Description

technical field [0001] The invention relates to a charging method, in particular to a charging method in the pre-charging stage of a power lithium battery and its series connection group. Background technique [0002] Power lithium batteries include lithium iron phosphate batteries, lithium cobalt oxide batteries, etc. Lithium iron phosphate batteries have the characteristics of good safety performance, excellent cycle performance, small size, light weight, high-rate charge and discharge, no environmental pollution, and a wide range of raw material sources. However, due to deviations in lithium raw materials, manufacturing processes, and artificial skill levels, both power-type and energy-type power batteries have poor consistency. Therefore, the currently produced power lithium batteries are not bad batteries, but the consistency is not high. [0003] The current various chargers use conventional constant current, constant voltage, trickle and other methods to charge lith...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44
CPCY02E60/10
Inventor 丁国民胡青
Owner ZHANGJIAGANG RUINENG TECH