Availability evaluation method on retired dynamic lithium battery

An evaluation method, lithium battery technology, applied in secondary battery repair/maintenance, measurement of electricity, measurement of electrical variables, etc., can solve the problems of low sorting efficiency, lengthy and complicated sorting process, heavy workload, etc., and achieve evaluation The result is scientific and reliable, the efficiency of sorting is improved, and the effect of less measurement parameters

Active Publication Date: 2015-02-04
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0004] Most of the above sorting methods for cascade utilization of decommissioned batteries require a series of complicated steps to screen out batteries that can be used in cascade use. However, the

Method used

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  • Availability evaluation method on retired dynamic lithium battery
  • Availability evaluation method on retired dynamic lithium battery
  • Availability evaluation method on retired dynamic lithium battery

Examples

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Example Embodiment

[0024] Example 1

[0025] A method for evaluating the availability of retired power single lithium batteries, which includes the following steps:

[0026] (1) The decommissioned battery is a square soft-packed lithium iron phosphate power battery produced by a company and retired from an electric bus. The battery has a nominal capacity of 20Ah, a platform voltage of 3.2V, and a charge-discharge range of 2.80~3.65V. The battery configuration method is as follows: first connect 10 square soft-packed lithium iron phosphate batteries in parallel to form a 200Ah battery module, and then form a 400Ah / 576V lithium iron phosphate power battery pack with a three-phase asynchronous motor drive system through 2 parallel and 180 series. The vehicle provides power. These batteries have been running for 3 years since they were put into operation in 2010, with a running mileage of 140,000 km. The battery pack is fully operated in a charging mode. In this embodiment, 320 200Ah battery modules...

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Abstract

The invention relates to an availability evaluation method on retired dynamic lithium battery. The method comprises the following steps: establishing core parameters for judging the availability of a retired dynamic single lithium battery; establishing the core parameter criteria of the retired dynamic single lithium battery; and establishing the proportion of the core parameter criteria of the retired dynamic single lithium battery; wherein the core parameters comprise residual battery capacity, safety, and cycle performance, the core parameter criteria comprise battery state of health (SOH), battery internal resistance, diaphragm penetration strength decreasing rate, diaphragm porosity, and secondary cycle life, and the diaphragm penetration strength decreasing rate and diaphragm porosity can be used to measure the diaphragm performance. The evaluation method has the advantages of less measurement parameters, simple and high efficient measuring method, and scientific and reliable evaluation result, and is capable of greatly improving the efficiency of screening on retired dynamic lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of storage batteries, and in particular relates to a method for evaluating the usability of decommissioned power single lithium batteries. Background technique [0002] Electric vehicles have high requirements on the performance of the power battery. When the capacity of the power battery drops to a certain level, in order to ensure the power performance, driving range and safety performance of the electric vehicle, it must be replaced. The battery replaced from the electric vehicle still has a high residual capacity. Lithium-ion batteries have the advantages of high specific energy, good high-temperature characteristics, and long cycle life. After being decommissioned as electric vehicle power batteries, they may be used in relatively good working conditions and relatively low requirements for battery performance after screening and regrouping. In some cases, the cascade utilization of power batteries can ...

Claims

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Application Information

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IPC IPC(8): H01M10/42
CPCG01R31/385G01R31/392
Inventor 赵光金吴文龙
Owner STATE GRID CORP OF CHINA
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