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High temperature life accelerated test method for lithium iron phosphate battery

The technology of a lithium iron phosphate battery and testing method is applied in the direction of measuring electricity, measuring devices, and measuring electrical variables, etc., which can solve the problems of inconvenient conversion and use, too high professional requirements, etc., and achieve easy promotion and use, high test accuracy, and improved The effect of utilization

Active Publication Date: 2018-10-12
BST POWER SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is based on a large number of mathematical models, which requires too much professionalism, and it is very inconvenient to convert and use in conventional industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The invention discloses an accelerated test method for high-temperature life of a lithium iron phosphate battery. The lithium iron phosphate battery that has been formed is taken and tested according to the following method:

[0032] The first step is the initial capacity test. Under normal temperature conditions, discharge the lithium iron phosphate battery at a constant current rate of 0.2C to a cut-off voltage of 2.5V, and then discharge the iron phosphate battery at a constant current of 0.5C, a cut-off voltage of 3.65V, and a cut-off current of 0.05C. The lithium battery is charged with constant current and constant voltage, and then discharged at a constant current of 0.2C rate to a cut-off voltage of 2.5V to test the initial capacity of the lithium iron phosphate battery;

[0033] The second step is the initial acceleration test. The lithium iron phosphate battery that has completed the initial capacity test is charged to 3.65V at a constant current of 0.5C at a h...

Embodiment 2

[0044] The invention discloses an accelerated test method for high-temperature life of a lithium iron phosphate battery. The lithium iron phosphate battery that has been formed is taken and tested according to the following method:

[0045] The first step is the initial capacity test. Under normal temperature conditions, the lithium iron phosphate battery is first discharged at a constant current of 0.2C to a cut-off voltage of 2.5V, and then the iron phosphate is discharged at a constant current of 0.3C, a cut-off voltage of 3.65V, and a cut-off current of 0.05C. The lithium battery is charged with constant current and constant voltage, and then discharged at a constant current of 0.2C rate to a cut-off voltage of 2.5V to test the initial capacity of the lithium iron phosphate battery;

[0046] The second step is the initial acceleration test. The lithium iron phosphate battery that has completed the initial capacity test is charged to 3.65V at a constant current of 0.3C at a ...

Embodiment 3

[0057] The invention discloses an accelerated test method for high-temperature life of a lithium iron phosphate battery. The lithium iron phosphate battery that has been formed is taken and tested according to the following method:

[0058] The first step is the initial capacity test. Under normal temperature conditions, discharge the lithium iron phosphate battery at a constant current rate of 0.2C to a cut-off voltage of 2.5V, and then discharge the iron phosphate battery at a constant current of 0.2C, a cut-off voltage of 3.65V, and a cut-off current of 0.05C. The lithium battery is charged with constant current and constant voltage, and then discharged at a constant current of 0.2C rate to a cut-off voltage of 2.5V to test the initial capacity of the lithium iron phosphate battery;

[0059] The second step is the initial acceleration test. The lithium iron phosphate battery that has completed the initial capacity test is charged to 3.65V at a constant current of 0.2C at a h...

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PUM

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Abstract

The invention discloses a lithium iron phosphate battery high-temperature life accelerated test method. A formed lithium iron phosphate battery is taken, and initial capacity test, initial accelerated test and cyclic accelerated test are carried out. Cyclic accelerated test refers to stepwise accelerated test at different temperatures and ends until the discharge capacity is less than 75% of the nominal capacity. The room-temperature discharge capacity of the last discharge cycle in the third step is converted into a capacity retention rate, and then, transformation is implemented according to a room-temperature life and high-temperature life transformation data table at a corresponding charging temperature to get the room-temperature life of the tested lithium iron phosphate battery. The lithium iron phosphate battery high-temperature life accelerated test method of the invention has the characteristics of high test accuracy, short test period, convenient test process, and strong reference.

Description

technical field [0001] The invention relates to the technical field of testing lithium iron phosphate batteries, in particular to a high-temperature life-span accelerated testing method for lithium iron phosphate batteries. Background technique [0002] Lithium-ion batteries are widely used in mobile digital products, and have also been used in electric vehicles as energy storage systems in recent years. The service life is an important index to measure the performance of the battery. At present, the life test method widely used in the research and development, inspection and selection of lithium-ion batteries is to conduct cycle tests under certain working conditions. Currently, the method used to test the cycle life of lithium-ion batteries The standards generally refer to the provisions of the two current standards in my country: QC / T743-2006 lithium-ion batteries for electric vehicles and QB / T2502-2000 general specifications for lithium-ion batteries. There are currently ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36
CPCG01R31/36G01R31/385G01R31/392
Inventor 范海满谢玉强朱杰邱恋东
Owner BST POWER SHENZHEN
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