Group matching and sorting method of lithium iron phosphate batteries
A lithium iron phosphate battery and battery technology, applied in the direction of sorting, etc., can solve the problems of low efficiency, high energy consumption of charge and discharge cycle, long group selection cycle, etc., to achieve low energy consumption, short sorting cycle, easy The effect of the operation
Active Publication Date: 2013-01-23
CAMEL GRP NEW ENERGY BATTERY CO LTD
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Problems solved by technology
The disadvantages are: long distribution group selection cycle, high energy consumption in charge and discharge cycles, and low efficiency
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[0023] Such as figure 1 , figure 2 Using the lithium-ion battery capacity separation equipment for production, the 10Ah battery is controlled by staged variable current charge and discharge according to the following steps:
[0024] ① Charge the empty battery to 3.2V with a constant current and constant voltage of 0.20C, with a cut-off current of 0.02C, and leave it for 15 minutes;
[0025] ② Discharge to 2.8V with a constant current of 0.20C, and leave it for 15 minutes;
[0026] ③ Charge to 3.4V with 0.50C constant current and constant voltage, cut-off current 0.02C, and leave it for 15 minutes;
[0027] ④ Discharge to 3.2V with a constant current of 0.50C, and leave it for 15 minutes;
[0028] ⑤ Then charge to 3.7V with 0.20C constant current and constant voltage, cut-off current 0.02C, and leave it for 15 minutes;
[0029] ⑥ Finally, discharge to 2.0V with a constant current of 0.50C.
[0030] Record the initial voltage of charging and discharging at each stage and t...
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The invention relates to a group matching and sorting method of lithium iron phosphate batteries. The method comprises the following steps of: performing staged variable current charge-discharge control on the batteries, and recording charge-discharge starting voltage in each stage and voltage change situation in constant shelving time; taking the whole full-charge and full-discharge process as a sorting period to complete the operation of taking the time of the period as a group matching and sorting standard; and classifying and grading the time of the period, selecting test parameters of one battery as standard parameters, merging the other batteries with the parameters which fall in the error range with the standard parameters as the same type of the batteries, and combining into the same type of space. According to the method disclosed by the invention, the defects of long group matching and sorting period, great charge-discharge circulating energy consumption and low efficiency in the prior art are overcome, the actual using situation of the batteries can be effectively simulated, and the group matching and sorting accuracy is high; the sorting period is relatively short, and the energy consumption is relatively low; sorted data can comprehensively reflect the polarization characteristics of the batteries; and matching internal resistance sorting can enable the battery consistency to achieve the higher level and further has the advantages of easiness in operation, high accuracy and the like.
Description
technical field [0001] The invention relates to a method for sorting lithium iron phosphate battery components, which can effectively improve the efficiency of sorting lithium iron phosphate battery components. Background technique [0002] At present, the group selection method of lithium iron phosphate battery is mainly resistance-capacitance sorting method. Charge and discharge the battery several times before grouping, and group according to the preset discharge capacity and static internal resistance grade. The disadvantages are: long cycle of group selection, high energy consumption of charging and discharging cycles, and low efficiency. Contents of the invention [0003] The object of the present invention is to provide a sorting method for lithium iron phosphate battery packs that can shorten the battery pack sorting cycle, reduce battery sorting energy consumption, and improve battery sorting efficiency. [0004] The technical solution of the present invention i...
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Inventor 吕循峰刘勇沈成龙张郁茹闻涛
Owner CAMEL GRP NEW ENERGY BATTERY CO LTD