Worn-out power battery secondary use screening method

A screening method and power battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as time-consuming and labor-intensive, and achieve the effect of reducing the number of charging and discharging, reducing equipment investment, and reducing quantity requirements

Active Publication Date: 2014-07-02
CHERY AUTOMOBILE CO LTD
View PDF5 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A power battery pack contains at least more than 100 single cells, and at most h

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Worn-out power battery secondary use screening method
  • Worn-out power battery secondary use screening method
  • Worn-out power battery secondary use screening method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Describe below in conjunction with embodiment.

[0024] Take the Chery M1 pure electric obsolete battery pack as an example, the battery contains 106 cells connected in series, and the rated capacity of the cells is 60Ah. The original battery pack is 339V, 20kwh.

[0025] (1) Connect the dismantled battery pack to the Digalong test cabinet (200A, 500V).

[0026] (2) Charge the entire battery pack at 1 / 3C (20A) to 381V (the number of cells in series multiplied by 3.6, that is, 106×3.6), and then charge at a constant voltage until the current is 0.05C (3A); stand still to the highest The temperature is less than 30°C (if the highest temperature is less than 30°C after charging and discharging, it should be left still for at least 0.5 hours); then discharge at 1 / 3C (20A) to 265V (multiply the number of series cells by 2.5, that is, 106×2.5).

[0027] (3) Through the data recorded by the BMS during the test, during the discharge process, select the SOC (battery state of c...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a worn-out power battery secondary use screening method. The whole of a battery pack is charged and discharged, through data recorded by the BMS in a test, in the discharging process, 2 to 4 SOC points with the SOC value ranging from 20% to 90% are selected, and voltage of each monomer in series is read; the batteries which are deviated from most of the batteries and overpass 5% in the voltage value are determined to be batteries of problems, and the residual batteries are initially identified as batteries in healthy states; internal resistance of each battery in the residual batteries is measured, a second screening is conducted through the inner resistance value, battery cells which deviate from normal resistance of the most battery cells by 20% are eliminated and the screening is finished; 10 batteries are randomly selected from the residual batteries to be charged and discharged, the average capacity of the 10 batteries is deemed as the capacity value of all the batteries in the healthy states. Compared with the detection method of the prior art, times of charging and discharging are greatly reduced, time needed by the new screening method is about 1/10 less than the traditional method, quantity demand for charging and discharging devices is greatly reduced, and equipment investment is reduced.

Description

technical field [0001] The invention relates to a screening method for secondary use of waste power batteries, in particular to a screening method for power lithium iron phosphate (LFP) lithium-ion batteries discarded after electric vehicles are used, and belongs to the technical field of power lithium-ion batteries. Background technique [0002] Energy and the environment have become the most concerned issues in the world. As a major consumer of oil resources and polluting the environment, traditional fuel vehicles are constantly being impacted by new clean energy vehicles. Electric vehicles replace oil with electricity and can achieve "zero emission" and "low noise", which is an important means to solve energy and environmental problems. With the shortage of petroleum resources and the development of battery technology, electric vehicles have gradually been popularized and applied all over the world. It has become a general consensus that the new generation of energy-sav...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01R31/36
Inventor 朱广燕海滨刘三兵
Owner CHERY AUTOMOBILE CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap