Self-discharge sorting process for lithium iron phosphate batteries

A lithium iron phosphate battery and battery discharge technology, which is applied in the field of lithium-ion batteries, can solve the problems of easy mismeasurement, large labor cost, and high equipment investment, and achieve high sorting accuracy, easy popularization and application, and low battery sorting costs. Effect

Inactive Publication Date: 2014-10-08
ZHEJIANG XINGHAI ENERGY TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a self-discharge sorting process for lithium iron phosphate batteries, which can effectively s

Method used

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  • Self-discharge sorting process for lithium iron phosphate batteries
  • Self-discharge sorting process for lithium iron phosphate batteries

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Embodiment Construction

[0015] A self-discharge sorting process for lithium iron phosphate batteries, comprising the following steps in sequence:

[0016] A. Discharge the 20-cell 18650-type lithium iron phosphate battery 1C to 2.0V, and leave it for 5 minutes.

[0017] 0.05C discharge to 2.0V;

[0018] B. Leave it aside for a period of time T1 is 4 hours, record the battery open circuit voltage V1;

[0019] C. Put it aside for a period of time T2 is 7 days, record the battery open circuit voltage V2;

[0020] D. Calculate the voltage drop ΔV=V1-V2 of the battery within 7 days and the average hourly voltage drop K=(V1-V2) / (7*24) within 7 days;

[0021] E. Set the upper and lower limits of ΔV and K, and reject unqualified products that are not within the range.

[0022] The test results are shown in the table below. According to the actual use requirements of the battery, the upper and lower limits of ΔV and K are set to 5-15mV and 0.04-0.09mV / h in this embodiment, and the batteries whose ΔV and K ...

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Abstract

The invention discloses a self-discharge sorting process for lithium iron phosphate batteries. The process comprises the following steps: discharging a graded battery to cut-off voltage; putting the battery aside for a period of time T1, and recording the open-circuit voltage V1 of the battery; putting the battery aside for a period of time T2 again, and recording the open-circuit voltage V2 of the battery; calculating the voltage drop DeltaV which is equal toV1-V2 of the battery within the time T2 and voltage drop K which is equal to (V1-V2)/T2 of the battery per unit of time within the time T2; setting the top and bottom limitation of DeltaV and K, and removing rejects beyond the range. The process has the advantages that the open-circuit voltage of the battery in a power empty state after being statically put for a period of time is retested; the self-discharge sorting precision of the batteries is high, and meanwhile, the sorting cost of the batteries is low; the process is suitable for being promoted and applied in the industries.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a self-discharge sorting process for lithium iron phosphate batteries. Background technique [0002] In the actual use of lithium-ion batteries, multiple single cells need to be combined in series and parallel to form a high-capacity, high-voltage battery module. Therefore, the difference in the consistency of the single cells directly determines the final performance of the battery pack. At present, the parameters for judging the difference in battery consistency mainly include capacity, voltage, internal resistance, and self-discharge rate. Lithium-ion batteries made of lithium iron phosphate as the positive electrode have the advantages of long cycle life, excellent safety characteristics and stable voltage platform, and have broad market application prospects. However, the lithium iron phosphate material is unstable between batches during the preparation proces...

Claims

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Application Information

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IPC IPC(8): B07C5/344
Inventor 吴晓潭李新丽李飞杨永潘飞华
Owner ZHEJIANG XINGHAI ENERGY TECH
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