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Evaluation method and device for accelerated attenuation of retired ternary lithium battery

A ternary lithium battery and evaluation method technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of insufficient accuracy and reliability, and achieve the effects of accurate judgment results, fewer test parameters, and simple test equipment

Inactive Publication Date: 2020-02-28
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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  • Description
  • Claims
  • Application Information

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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, the application provides a decommissioned ternary lithium battery for widely used ternary lithium batteries on the market. Method and device for evaluating accelerated decay of lithium batteries

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  • Evaluation method and device for accelerated attenuation of retired ternary lithium battery

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Embodiment 1

[0032] This embodiment takes 10 retired ternary lithium single batteries randomly selected as the object, and provides an evaluation method for the accelerated decay of retired ternary lithium batteries. The remaining capacity at the time of decommissioning is about 80%; the evaluation method is as follows:

[0033] (1) First, cycle charge and discharge the 1# retired lithium battery. The method of cycle charge and discharge is: at room temperature (20±5°C), discharge the remaining power of the battery, let it stand for 15 minutes, and carry out constant current at 0.3C Charge to 4.2V and switch 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 3.0V;

[0034] (2) During each charging process of 1# battery, when the voltage reaches 3.80V, 3.85V, 3.90V, 3.95V, 4.00V and 4.05V, calculate the voltage change of the battery in the next 2 minutes respectively, recor...

Embodiment 2

[0043] This embodiment takes 20 randomly selected decommissioned ternary lithium single batteries as the object, and provides an evaluation method for the accelerated decay of decommissioned ternary lithium batteries. The remaining capacity at the time of decommissioning is about 90%; the evaluation method is as follows:

[0044] (1) Firstly, charge and discharge the 11# decommissioned lithium battery cycle. The method of cycle charge and discharge is: at room temperature (20±5°C), discharge the remaining battery power, let it stand for 15 minutes, and carry out constant current at 0.3C Charge to 4.2V and switch 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 3.0V;

[0045] (2) During each charging process of the 11# battery, when the voltage reaches 3.7V, 3.8V, 3.9V, 4.0V and 4.1V, calculate the voltage change of the battery in the next 3 minutes, and reco...

Embodiment 3

[0054] In this embodiment, 10 retired ternary lithium single batteries are randomly selected as the object, and an evaluation method for the accelerated decay of retired ternary lithium batteries is provided. , the remaining capacity at the time of decommissioning is about 85%, and the evaluation method is as follows:

[0055] (1) Firstly, charge and discharge the 31# decommissioned lithium battery cycle. The method of cycle charge and discharge is: at room temperature (20±5°C), discharge the remaining power of the battery, let it stand for 15 minutes, and carry out constant current at 0.3C Charge to 4.2V and switch 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 3.0V;

[0056] (2) During each charging process of 31# battery, when the voltage reaches 3.75V, 3.80V, 3.85V, 3.90V, 3.95V, 4.00V and 4.05V, calculate the voltage change of the battery in the next ...

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Abstract

The invention relates to an evaluation method and device for accelerated attenuation of a retired ternary lithium battery. The evaluation method comprises the following steps of: discharging the residual electric quantity of a ternary lithium battery to be measured, performing constant-current charging on the lithium battery of which the electric quantity is discharged to a charging upper limit cut-off voltage U, then performing constant-voltage charging until the current is reduced to be lower than 0.1 C, performing standing, performing discharging in a constant-current discharging mode untilthe current is lower than a discharging lower limit cut-off voltage U, and stopping discharging; and circularly charging and discharging the ternary lithium battery to be measured in the same mode, recording and calculating voltage and capacity changes in time t after a plurality of voltage points of the battery charging and discharging process in each cycle process, calculating a deviation R ofa corresponding voltage capacity change ratio after the plurality of same voltage points of two cycles, and judging whether the ternary lithium battery to be measured enters an accelerated attenuationstage or not according to the R value. According to the evaluation method, the performance state of the lithium battery can be quickly and nondestructively evaluated, and particularly, the 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 accelerated decay of decommissioned ternary lithium batteries. 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, the lithium-ion batteries of the domestic ternary lithium system are developing rapidly, but with the increase in the number of electric vehicles, ternary lithium batteries that cannot meet the standards for electric vehicles will be retired in large numbers, showing a cumulative and explosive growth trend. The retired ternary lithium batteries replaced from electric vehicles still have high residual energy, generally 70-80% of the initial energy. After ...

Claims

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Application Information

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