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Battery cell consistency screening method and system thereof

A screening method and consistency technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of long test period, poor performance consistency of battery packs, and high cost, so as to improve capacity utilization and service life, and improve Performance consistency, the effect of overcoming poor performance consistency

Active Publication Date: 2019-10-15
深圳市清新电源研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the cascade utilization process of power lithium-ion batteries, industrial CT non-destructive testing and three-dimensional imaging technologies are mostly used to detect the internal structure of decommissioned power batteries or disassemble the batteries, and use XRD, SEM, TEM and other equipment to analyze electrode materials , this method has high costs and a long test cycle, which is not conducive to large-scale promotion and use
Another method is to test its capacity, internal resistance, charge-discharge characteristic curve and other data like a fresh battery and use this as a basis to screen and match groups. Complicated, the performance test of the battery cannot fully reflect the real state of the decommissioned battery, so that the consistency of the battery pack cannot be guaranteed, the battery pack cannot perform the best performance, and the performance consistency of the obtained battery pack is poor

Method used

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  • Battery cell consistency screening method and system thereof
  • Battery cell consistency screening method and system thereof

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Experimental program
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Effect test

Embodiment 1

[0035] A battery consistency screening method, refer to figure 1 , figure 1 It is a method flowchart of a specific embodiment of a cell consistency screening method in the present invention; including:

[0036] S1. Preliminary screening step of cell capacity: perform the first screening of multiple cells to be screened according to the preset cell capacity to obtain a primary screening cell;

[0037] S2. Performance parameter screening step: performing a second screening on the first-screened cells according to the performance parameters of at least three types of cells to obtain secondary-screened cells;

[0038] S3. Coulombic efficiency screening step: perform the third screening according to the preset Coulombic efficiency and the Coulombic efficiency of the secondary screening cell to obtain the triple screening cell;

[0039] S4. The highest peak value screening step of the dQ / dV curve: Obtain the dQ / dV curve and the highest peak voltage corresponding to the dQ / dV curve...

Embodiment 2

[0062] Embodiment 2 is provided based on Embodiment 1, and the embodiment proposes a cell consistency screening system, including:

[0063] The cell capacity preliminary screening module is used to perform the first screening of multiple cells to be screened according to the preset cell capacity to obtain primary screening cells;

[0064] The performance parameter screening module is used to perform a second screening on the primary screening battery according to the performance parameters of at least three batteries to obtain the secondary screening battery; wherein, the performance parameters of the battery include the capacity of the battery, the internal capacity of the battery At least three parameters in resistance, open circuit voltage of the cell, and self-discharge rate of the cell;

[0065] The Coulombic efficiency screening module is used to perform a third screening according to the preset Coulombic efficiency and the Coulombic efficiency of the secondary screening...

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Abstract

The invention discloses a battery cell consistency screening method and a system thereof. After preliminary battery cell capacity screening and performance parameter screening, the battery pack capacity after battery cell grouping is very sensitive to the coulombic efficiency inconsistency, so that when the coulombic efficiency inconsistency is increased, the inconsistency of durability is increased, the dQ / dV curves can better reflect the electrochemical characteristics in the batteries, and the peak voltage parameters can more correctly reflect the recession degrees in the battery packs; andtherefore, the method considers the consistency between the coulombic efficiency of the battery cells and the highest peak voltage of the dQ / dV curves at the same time so as to effectively improve the performance inconsistency of the grouped battery cells, thereby improving the capacity utilization rate and service life of the battery packs and overcoming the technical problem that the grouped battery cells are bad in performance consistency in the prior art.

Description

technical field [0001] The invention relates to the field of cell screening, in particular to a cell consistency screening method and system thereof. Background technique [0002] In the cascade utilization process of power lithium-ion batteries, industrial CT non-destructive testing and three-dimensional imaging technologies are mostly used to detect the internal structure of decommissioned power batteries or disassemble the batteries, and use XRD, SEM, TEM and other equipment to analyze electrode materials , this method has a high cost and a long test cycle, which is not conducive to large-scale promotion and use. Another method is to test its capacity, internal resistance, charge-discharge characteristic curve and other data like a fresh battery and use this as a basis to screen and match groups. Complicated, the performance test of the battery cannot fully reflect the real state of the decommissioned battery, so that the consistency of the battery pack cannot be guarant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/396
CPCG01R31/396
Inventor 夏悦罗丹张哲旭石玉磊
Owner 深圳市清新电源研究院