Health state assessment method of retired electric automobile power cell

A technology for electric vehicles and power batteries, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of long time required, damage to batteries, and unusable batteries, etc., to achieve rapid detection and improve economic efficiency.

Inactive Publication Date: 2016-10-05
STATE GRID CORP OF CHINA +3
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AI Technical Summary

Problems solved by technology

[0005] The external performance of the battery health status is the external characteristic parameters of the battery, mainly including the appearance, open circuit voltage, internal resistance, capacity, energy, charge retention capacity, life characteristics, environmental adaptability, rate characteristics and safety characteristics of the battery. Among the characteristics, the appearance, open circuit voltage, internal resistance, cap

Method used

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Embodiment Construction

[0037] The specific implementation manners of the present invention will be further described in detail below.

[0038] The invention provides a method for evaluating the health status of a power battery of a decommissioned electric vehicle. The method includes: performing basic performance inspection on the decommissioned electric vehicle battery, sampling detection of key performance of the battery, and detection of internal characteristics of the battery.

[0039] 1. Basic performance test

[0040]The basic performance of the battery mainly includes: the appearance of the battery, open circuit voltage, internal resistance, capacity, capacity and charge retention. The detection of these performances of the battery can be completed in a relatively short period of time, and these detections will not damage the performance of the battery, so a full inspection of these performances of the battery is carried out.

[0041] The basic performance inspection includes the inspection ...

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Abstract

The invention provides a health state assessment method of a retired electric automobile power cell. The method comprises the steps of: carrying out basic performance detection, cell key performance sampling detection and cell internal characteristic detection on the retired electric automobile power cell, wherein the basic performance detection comprises cell appearance detection, cell open-circuit voltage and internal resistance detection, cell capacity and energy detection, and cell charge retention detection; the cell key performance sampling detection comprises cell life characteristic detection, cell environment adaptability detection, cell multiplying power characteristic detection and cell safety performance detection; and the cell internal characteristic detection comprises electrode slice form and material combination condition analysis, diaphragm form and aged condition analysis, material crystal structure analysis and composition analysis, material available capacity and electrochemistry cycling performance analysis, and electrode surface solid electrolyte interface analysis. By adopting the method, the basic parameters of the cell are comprehensively detected, sampling detection is carried out on the key parameters and internal characteristics of the cell, and the health state of the cell is accurately evaluated.

Description

technical field [0001] The invention relates to a method in the technical field of battery energy storage, in particular to a method for evaluating the health status of a decommissioned electric vehicle power battery. 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 temperature characteristics, and long cycle life. After being decommissioned as electric vehicle power batteries, after screening and regrouping, they may be used in relatively good working conditions and relatively low requirements for battery performance. In some cases, the step-by-step utilization of power ba...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 刘道坦范茂松樊义兴于文海徐斌范红家
Owner STATE GRID CORP OF CHINA
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