Method for quickly evaluating expansion of aluminum-housing high-nickel ternary battery

A ternary battery, high nickel technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc.

Inactive Publication Date: 2017-11-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing battery float charge technology is mainly used in the accelerated test method of lithium battery life and the analysis of the deterioration mechanism of positive electrode materials, while the expansion thickness of the battery is limited to the exploration of real-time and rapid monitoring methods, and the research on the expansion thickness of the battery at different cycles is almost blank

Method used

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  • Method for quickly evaluating expansion of aluminum-housing high-nickel ternary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for quickly evaluating the expansion of aluminum shell high-nickel ternary batteries, the steps are as follows:

[0025] (1) Take the sealed aluminum shell high-nickel ternary battery, charge the battery to 4.2V at 1C at a temperature of 25±2°C, measure and record the initial thickness d of the battery 0 27.05mm;

[0026] (2) Float charge it for 15 days at a temperature of 25±2°C with a current of 0.1C and a voltage of 4.25V. The simulated battery life is 1 year. Test and record the thickness d of the battery at this time 1 is 27.46mm, then the battery expansion coefficient η=(d 1 -d 0 ) / d 0 was 1.52%.

Embodiment 2

[0028] A method for quickly evaluating the expansion of aluminum shell high-nickel ternary batteries, the steps are as follows:

[0029] (1) Take the sealed aluminum shell high-nickel ternary battery, charge the battery to 4.2V at 1.0C at a temperature of 25±2°C, measure and record the initial thickness d of the battery 0 27.05mm;

[0030] (2) At a temperature of 25±2°C, float charge it for 90 days with a current of 0.15C and a voltage of 4.25V. The simulated battery life is 4 years. Test and record the thickness d of the battery at this time 1 is 28.42mm, then the battery expansion coefficient η=(d 1 -d 0 ) / d 0 was 5.16%.

Embodiment 3

[0032] A method for quickly evaluating the expansion of aluminum shell high-nickel ternary batteries, the steps are as follows:

[0033] (1) Take the sealed aluminum shell high-nickel ternary battery, charge the battery to 4.2V at a temperature of 45±2°C at 1.0C, measure and record the initial thickness d of the battery 0 27.05mm;

[0034] (2) At a temperature of 45±2°C, with a current of 0.1C and a voltage of 4.25V, float charge it for 83.5 days. The simulated battery life is 10 years. Test and record the thickness d of the battery at this time 1 is 28.87mm, then the battery expansion coefficient η=(d 1 -d 0 ) / d 0 was 6.73%.

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Abstract

The invention discloses a method for quickly evaluating expansion of an aluminum-housing high-nickel ternary battery. The method is characterized by taking a sealed aluminum-housing high-nickel ternary battery, charging the battery to 4.2 V under constant current and constant voltage, and measuring and recording initial thickness d0 of the battery; and carrying out floating charge on the battery for n days under constant voltage, n=1-100, and measuring and recording the thickness d1 of the battery, battery expansion coefficient being eta=(d1-d0) / d0. The method simulates expansion thicknesses of the battery in different service life through a floating charge mode, is high in test precision, short in period and safe and reliable in detection process, and has a great guidance meaning for battery thickness exploration in normal use process.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for quickly evaluating the expansion of an aluminum shell high-nickel ternary battery. Background technique [0002] As the core component of new energy vehicles, the performance of power batteries is the key to determining whether new energy vehicles can develop. Lithium-ion batteries are internationally recognized as the most suitable chemical energy source, and have become the first choice for new energy vehicle power batteries. With the rapid development of the global new energy vehicle industry, the demand for power lithium-ion batteries will show an explosive growth trend. From the perspective of the working mechanism of lithium batteries, when discharging, lithium ions are deintercalated, and the volume of the positive electrode expands; when charging, lithium ions are intercalated from the positive electrode, and the negative electrode expands; in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3648G01R31/385
Inventor 吴小兰张宏立
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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