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Lithium precipitation forecast method of lithium ion battery

A lithium-ion battery and prediction method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as battery safety hazards, achieve high accuracy and save resources

Active Publication Date: 2018-12-18
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can only be judged qualitatively, and consumes a lot of manpower and material resources, and there are certain safety hazards in the battery disassembly process

Method used

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  • Lithium precipitation forecast method of lithium ion battery
  • Lithium precipitation forecast method of lithium ion battery
  • Lithium precipitation forecast method of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The battery adopts ternary material: NCM523; anode material: graphite AK01 (gram capacity 340mAh / g, degree of graphitization 94%); electrolyte uses lithium hexafluorophosphate (LiPF6) with a concentration of 1.0M as lithium salt, and vinylene carbonate as additive , prepared with a mixture of propylene carbonate (PC), ethylene carbonate (EC) and dimethyl carbonate (DMC) as a solvent; the anode-to-lithium potential U under specified conditions when lithium-ion batteries are charged at different rates x .

Embodiment

[0038] The specific introduction of embodiment is as follows:

[0039] In the preparation stage of the cell, copper wire is embedded, and after the cell is activated, the copper wire is plated with lithium to obtain a reference electrode; then the cell is placed in a high and low temperature box and connected to the charging and discharging cabinet, and the test is completed according to the process and data is collected.

[0040] The specific test process is as follows:

[0041] 1) Adjust the ambient temperature to T (T is set for experimental requirements);

[0042] 2) Stand still for 120min;

[0043] 3) The nominal 1C current discharges to the lower limit cut-off voltage;

[0044] 4) Stand still for 5 minutes;

[0045] 5) Charge to the upper limit cut-off voltage;

[0046] 6) Stand still for 5 minutes.

[0047] Record the corresponding potential U of the anode under different magnifications at the same temperature x .

[0048]The anode potential and the charging curr...

Embodiment 2

[0060] The battery adopts ternary material: NCM523; anode material: artificial graphite SF01 (gram capacity is 350mAh / g, degree of graphitization is 96.5%); electrolyte uses lithium hexafluorophosphate (LiPF6) with a concentration of 1.0M as lithium salt, and vinylene carbonate as The additive is made from a mixture of propylene carbonate (PC), ethylene carbonate (EC) and dimethyl carbonate (DMC) as a solvent; the anode-to-lithium potential U under specified conditions when lithium-ion batteries are charged at different rates x .

[0061] The specific introduction of embodiment is as follows:

[0062] In the preparation stage of the cell, copper wire is embedded, and after the cell is activated, the copper wire is plated with lithium to obtain a reference electrode; then the cell is placed in a high and low temperature box and connected to the charging and discharging cabinet, and the test is completed according to the process and data is collected.

[0063] Record the corres...

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PUM

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Abstract

The invention provides a lithium precipitation forecast method of a lithium ion battery. The lithium precipitation forecast method comprises the steps of S1) performing linear fitting on a positive potential and a charging current or charging rate to obtain slope during the charging process of the lithium ion battery; and S2) performing linear fitting on charge transferring resistance and the slope of the lithium ion battery, obtaining a condition model of the charging current or the charging rate of the lithium ion battery and a temperature according to a relation between the charge transferring resistance and the temperature T, and forecasting critical lithium precipitation charging current or charging rate according to the condition model. Compared with the prior art, the lithium precipitation critical condition of the lithium ion battery under different ambient temperatures can be quantitatively judged by a modeling mode according to Arrhenius formula, a battery cell is not neededto be disassembled, time and labor are saved, resources are saved, quantization is achieved, and high accuracy is achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a prediction method for lithium analysis of lithium ion batteries. Background technique [0002] Lithium-ion battery As a new type of green energy, lithium-ion batteries have attracted widespread attention in recent years. At present, the negative electrode materials of commercial lithium-ion batteries are mainly graphite carbon materials. When charging at a high rate or at low temperature, the internal polarization of the battery increases, and the negative electrode overpotential Larger, the lithium ions in the battery are precipitated on the surface of the carbon negative electrode, which seriously forms lithium dendrites, pierces the separator, causes a short circuit between the positive and negative electrodes, and greatly reduces the safety performance. It is possible to design a reasonable charge by judging in advance the critical conditions for lithium precip...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/3648
Inventor 李恺黎钢姚万浩闫艳红
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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