Detecting and sorting method for cascade utilization of lithium batteries

A lithium battery and step-by-step technology, which is applied in the field of electric energy, can solve the problems of high price, inability to use the detection of lithium battery step-by-step utilization, and long time consumption, so as to achieve good consistency, ensure safety and long-term reliable operation.

Active Publication Date: 2019-05-10
JIANGSU TIANHE ENERGY STORAGE CO LTD
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Problems solved by technology

These methods are suitable for visually analyzing the internal mechanism of the attenuation and failure of a single lithium battery, but they are expensive and time-consuming, and cannot be applied to the detec

Method used

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  • Detecting and sorting method for cascade utilization of lithium batteries
  • Detecting and sorting method for cascade utilization of lithium batteries

Examples

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[0029] Example 1

[0030] A detection and sorting method for the cascade utilization of lithium batteries includes the following steps:

[0031] (1) Collect a batch of square lithium iron phosphate batteries with original rated capacity of 100Ah and rated capacity of 320Wh.

[0032] (2) Perform visual inspection of the collected batch of lithium batteries. Batteries that have any of deformation, bulging, damage, leakage or severe corrosion are excluded, and are considered unsuitable for cascading use, and no inspection is performed.

[0033] (3) Discharge the lithium battery that has passed the visual inspection to 2.8V.

[0034] (4) Preset 4 charging capacity Q 1 =64Wh, Q 2 =128Wh, Q 3 =192Wh and Q 4 =256Wh, conduct 4 detection experiments.

[0035] (5) Charge the lithium battery to 64Wh, the charging method is constant power charging, the charging power is 80W, and the temperature of the test environment is controlled within the range of 20-30°C;

[0036] (6) After standing for 1 hour, ...

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Abstract

The invention discloses a detecting and sorting method for cascade utilization of lithium batteries. The detecting and sorting method comprises the following steps that the to-be-detected lithium batteries are discharged to a preset voltage value; the n charging amounts are preset, wherein n is an integer which is greater than or equal to 1; according to one of the preset charging amounts, the to-be-detected lithium batteries are charged; after charging is completed, open-circuit voltage testing, frequency spectrum impedance testing and discharge amount testing are conducted on the to-be-detected lithium batteries; tested numerical values are analyzed, a charging-discharging efficiency value and a resistance valve and a capacitance value in a battery equivalent model are extracted, and deviation rates between all the numerical values and sorting gear set parameters are calculated; the steps are repeated until all the preset charging amounts are tested; and the lithium batteries suitable for cascade utilization are sorted according to the obtained deviation rates. The detecting and sorting method has the advantages of accuracy, high efficiency and energy saving, the health states ofthe sorted lithium batteries are fully represented, good consistency is displayed in the actual dynamic operation process of a possible application scenario, and the detecting and sorting method canbe applied to evaluation before cascade utilization of the large-batch lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of electric energy, and in particular relates to a detection and sorting method for cascaded utilization of lithium batteries. Background technique [0002] With the gradual industrialization and commercialization of electric vehicles, the output of electric vehicles in my country has grown rapidly. In 2017, a total of 794,000 electric vehicles were produced and 772,000 were sold. By 2020, the production and sales of electric vehicles will reach 2 million. The electric vehicle industry chain has driven the explosive growth of the lithium battery industry, and the stock of lithium batteries for automotive power has also increased sharply. Usually, when the remaining capacity of the automotive power lithium battery is reduced to 70-80% of the initial capacity, it cannot meet the power performance, cruising range and safe operation requirements of the electric vehicle, and needs to be replaced. The replaced l...

Claims

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Application Information

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IPC IPC(8): B07C5/344G01R31/389G01R31/392G01R31/378G01R31/388G01N21/84G01N21/95
Inventor 盛赟戴忠梁卞铁铮张臻
Owner JIANGSU TIANHE ENERGY STORAGE CO LTD
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