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A battery consistency screening method and system thereof

A screening method and consistent technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of long test period, poor consistency of battery pack performance, complex working environment, etc., to improve capacity utilization and service life, The effect of overcoming poor performance consistency and improving performance consistency

Active Publication Date: 2021-10-29
深圳市清新电源研究院
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  • Abstract
  • Description
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  • 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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  • A battery consistency screening method and system thereof
  • A battery 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 its system. After the battery cell capacity preliminary screening and performance parameter screening, the battery group capacity after the battery cells are grouped is very sensitive to the inconsistency of the Coulomb efficiency. The inconsistent increase of efficiency will also increase the inconsistency of durability, and the dQ / dV curve can better reflect the characteristics of the battery's internal electrochemistry, and its peak voltage parameter can more accurately reflect the degree of degradation inside the battery pack; therefore, the present invention It also considers the consistency of the Coulombic efficiency of the cell and the highest peak voltage of the dQ / dV curve, which can effectively improve the performance consistency of the matched cells, thereby improving the capacity utilization and service life of the battery pack, and overcoming the problems in the prior art. There is a technical problem of poor performance consistency of the assembled batteries.

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 Patents(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