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Evaluation method and device for accelerated attenuation of cascade utilization lithium iron phosphate battery

A lithium iron phosphate battery and evaluation method technology, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve problems such as insufficient accuracy and reliability, and achieve the effects of accurate judgment results, simple testing equipment, and fewer testing parameters

Inactive Publication Date: 2020-04-28
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to solve the technical problem of insufficient accuracy and reliability of the evaluation results of the existing lithium battery life attenuation model, this application provides a cascade utilization iron phosphate battery for lithium iron phosphate batteries widely used in the market Method and device for evaluating accelerated decay of lithium batteries

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  • Evaluation method and device for accelerated attenuation of cascade utilization lithium iron phosphate battery
  • Evaluation method and device for accelerated attenuation of cascade utilization lithium iron phosphate battery

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Embodiment 1

[0032] This embodiment takes 12 randomly selected retired lithium iron phosphate single batteries as the object, and provides an evaluation method for cascade utilization of lithium iron phosphate batteries to accelerate decay. The batteries are numbered 1# to 12#, and the rated capacity is 20Ah , the remaining capacity at the time of decommissioning is about 80%; the evaluation method is as follows:

[0033] (1) Perform cyclic charge and discharge on 1#~12# decommissioned lithium iron phosphate batteries. C carries out constant current charging to 3.65V and turns to constant voltage charging until the charging current drops to 0.05C. After standing for 30 minutes, discharge at a constant current of 0.5C until the voltage drops to 2.8V;

[0034] (2) During each charging process of the battery, when the voltage reaches 3.20V, 3.25V, 3.30V, 3.35V and 3.40V, calculate the voltage change of the battery in the next 2 minutes respectively, and record them as ΔU 1 , ΔU 2 , ΔU 3 , ...

Embodiment 2

[0045] This embodiment takes 12 randomly selected retired lithium iron phosphate cells as the object, and provides an evaluation method for cascade utilization of lithium iron phosphate batteries to accelerate decay. The batteries are numbered 13# to 24#, and the rated capacity is 20Ah , the remaining capacity at the time of decommissioning is about 80%; the evaluation method is as follows:

[0046] (1) Perform cyclic charge and discharge on 13#~24# decommissioned lithium batteries. The method of cyclic charge and discharge is: at room temperature (20±5℃), discharge the remaining power of the battery, let it stand for 10 minutes, and proceed at 0.2C Constant current charging to 3.55V, then constant voltage charging, until the charging current drops to 0.05C, after standing for 20 minutes, discharge at a constant current of 0.4C until the voltage drops to 2.7V;

[0047] (2) During each charging process of the battery, when the voltage reaches 3.1V, 3.13V, 3.16V, 3.19V, 3.22V, 3...

Embodiment 3

[0057] This embodiment takes 12 randomly selected decommissioned lithium iron phosphate single batteries as the object, and provides an evaluation method for cascade utilization of lithium iron phosphate batteries to accelerate decay. 80Ah, the remaining capacity is about 85% when decommissioning, the evaluation method is as follows:

[0058] (1) Perform cyclic charge and discharge on 25#~36# decommissioned lithium batteries. The method of cyclic charge and discharge is: at room temperature (20±5℃), discharge the remaining battery power, let it stand for 20 minutes, and proceed at 0.4C Constant current charging to 3.6V, then constant voltage charging until the charging current drops to 0.05C, after standing for 40 minutes, discharge at a constant current of 0.6C until the voltage drops to 2.6V;

[0059] (2) During each charging process of the battery, when the voltage reaches 3.2V, 3.25V, 3.3V, 3.35V and 3.4V, calculate the voltage change of the battery in the next 1.5 minutes...

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Abstract

The invention relates to an evaluation method and device for accelerated attenuation of a cascade utilization lithium iron phosphate battery. The evaluation method comprises the following steps: completely discharging a residual electric quantity of a lithium iron phosphate battery to be measured, carrying out constant-current charging on a lithium battery after the electric quantity is completelydischarged to a charging upper limit cut-off voltage U, then carrying out constant-voltage charging till that the current is reduced to be lower than 0.1 C, standing, discharging in a constant-current discharging mode till that the voltage is lower than a discharging lower limit cut-off voltage U, and stopping discharging; circularly charging and discharging the lithium iron phosphate battery tobe measured in the same way; and recording and calculating voltage and capacity changes in time t after a plurality of voltage points in a charging and discharging process of the battery in each cycleprocess, calculating a deviation R of a corresponding voltage capacity change ratio after the plurality of same voltage points in two cycles, and judging whether the lithium iron phosphate battery tobe measured enters an accelerated attenuation stage or not according to an R value. According to the evaluation method, a performance state of the lithium battery can be quickly and nondestructivelyevaluated, and particularly, an accelerated attenuation phenomenon of the lithium battery can be accurately judged.

Description

technical field [0001] The present application belongs to the technical field of lithium batteries, and in particular relates to an evaluation method and device for cascade utilization of lithium iron phosphate batteries to accelerate decay. Background technique [0002] A new generation of energy-saving and environmentally friendly vehicles represented by electric vehicles is an inevitable trend in the development of the automobile industry, and the promotion and use of electric vehicles has a huge demand for power batteries. At present, domestic electric vehicles mainly use lithium-ion batteries of the lithium iron phosphate system as the power source, but with the increase in the number of electric vehicles, lithium iron phosphate batteries that cannot meet the standards for electric vehicles will be decommissioned in large numbers, showing a cumulative and explosive pattern. growth trend. The cascaded lithium iron phosphate batteries replaced from electric vehicles stil...

Claims

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Application Information

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IPC IPC(8): G01R31/378G01R31/385G01R31/387G01R31/392
CPCG01R31/378G01R31/385G01R31/387G01R31/392
Inventor 赵光金董锐锋王放放胡玉霞
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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