Method for evaluating performance of lithium battery

A lithium battery and performance technology, applied in the field of lithium battery recycling and reuse, evaluating lithium battery performance, and can solve problems such as differences in battery effective capacity

Active Publication Date: 2018-03-09
LUOHE POWER SUPPLY OF HENAN ELECTRIC POWER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the effective capacity of each single battery in a decommissioned lithium battery pack is different. To achieve a reasonable cascade utilization, it is necessary to re-evaluate its SOH (state of health of the lithium battery) and performance to determine its applicable gradient range

Method used

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  • Method for evaluating performance of lithium battery
  • Method for evaluating performance of lithium battery
  • Method for evaluating performance of lithium battery

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Experimental program
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Embodiment Construction

[0046] The cascade utilization lithium battery performance evaluation test needs to be carried out under the limited test time and complex external environment under the premise of ensuring the safety of the decommissioned lithium battery pack. The present invention considers the worst case (unknown such as historical data and important data) and Under the actual engineering requirements, the test conditions suitable for cascade utilization of lithium batteries are designed. Based on the necessary measurement data (charge and discharge voltage, charge and discharge current, and operating temperature) of single batteries obtained in real time, the extraction method of lithium battery health characteristics is studied and used This makes a reasonable performance evaluation, which will be analyzed in detail below.

[0047] 1. Limited test time

[0048]In the dynamic internal resistance test, the lithium battery is fully charged in the CCCV mode, and then intermittently discharged...

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Abstract

The invention discloses a method for evaluating the performance of a lithium battery. The method is used for evaluating the performance of the lithium battery in cascade utilization. The method comprises the following steps: firstly, designing performance testing conditions of the lithium battery, namely designing testing time, determining an initial SOC state, and designing discharging interval time; extracting health characteristic data of the lithium battery according to the designed testing conditions; then, performing SOH (state of health) estimation based on an SOH decision method of a multi-healthy life model data fusion technology; and finally, dividing a cascade utilization range of the lithium battery. The method disclosed by the invention can be used for cascade recycling of thelithium battery, can enable the performance of the lithium battery to be fully exerted, is favorable for energy saving and emission reduction, and can also relieve the stress of the recovery work caused by recovering a large number of lithium batteries in a recovery phase.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method for evaluating the performance of lithium batteries, which is applied to the stepwise recovery and reuse of lithium batteries. Background technique [0002] Lithium-ion batteries (referred to as lithium batteries) gradually replace lead-acid, nickel-metal hydride, nickel-cadmium and other batteries with the advantages of light weight, small size, long life, high voltage, and no pollution, and become the first choice for electric vehicle power batteries. When the charging capacity of the car lithium battery pack is reduced to about 80% of its original capacity, it is no longer suitable for continued use in electric vehicles. If these lithium battery packs are scrapped for recycling and cannot be fully utilized, it will cause Great waste of resources. When the appearance of the lithium battery is intact, there is no damage, and the functional components are effective, it ...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/48H01M10/54G01R31/36
CPCG01R31/385H01M10/4285H01M10/48H01M10/54Y02E60/10Y02W30/84
Inventor高富明
OwnerLUOHE POWER SUPPLY OF HENAN ELECTRIC POWER CORP