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Rapid prediction method of cycle life of lithium-ion battery

A lithium-ion battery, cycle life technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of complex calculation, large deviation of actual test results, and lack of universality, so as to reduce time and resources. Wasteful, universal, consistent effect

Active Publication Date: 2017-01-11
SHANGHAI GUOXUAN NEW ENERGY CO LTD
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Problems solved by technology

These reported cycle life prediction methods have their own limitations. The first method only considers the relationship between the physical properties of the negative electrode material and the number of cycles, and ignores the factors such as positive electrode materials and electrolytes that affect the cycle life of lithium-ion batteries. influence, and the deviation from the actual test results is large; the second method predicts battery life based on the calculation structure of the theoretical model, and the calculation is complex and not universal

Method used

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  • Rapid prediction method of cycle life of lithium-ion battery
  • Rapid prediction method of cycle life of lithium-ion battery
  • Rapid prediction method of cycle life of lithium-ion battery

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with accompanying drawing:

[0021] A method for rapidly predicting the cycle life of a lithium-ion battery, specifically comprising the following steps:

[0022] S1: Place the battery to be evaluated under the cycle conditions to be evaluated for cycle performance tests with different cycle times, record the different cycle times and their corresponding capacity retention rates, and the battery is in a discharged state after the cycle test is stopped.

[0023] S2: Disassemble the battery after different cycles, and bake it in a high-temperature vacuum oven at 130°C for 8 hours until the electrolyte is dried and removed, and use the mass difference subtraction method to calculate the electrolyte retention rate of the battery after cycles; The electrolyte retention rate refers to the ratio of the mass of the battery lost before and after baking to the mass of the volatile electrolyte components in the i...

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Abstract

The invention relates a rapid prediction method of cycle life of lithium-ion battery, comprising the steps of conducting short-term test of cycle performance of battery to be evaluated for different cycle times, recording corresponding capacity retention rate of different cycle times; dismantling the battery and placing it in high temperature oven for baking until the electrolyte is dried and removed, utilizing quality minusing method to calculate retention rate of electrolyte after cycle; conducting fitting calculation according to test data of cycle times, capacity retention rate and electrolyte retention rate, to predict cycle life of battery. Compared with conventional cycle life test method, the invention is easy to operate and greatly shortens test period of cycle life, and compared with pure theoretical calculation and experience model prediction, the invention has higher universality and better consistency with actual test result.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cycle life testing, in particular to a rapid prediction method for the cycle life of lithium-ion batteries. Background technique [0002] Due to the advantages of high energy density, excellent rate and power performance, long cycle life, safety and environmental protection, lithium-ion batteries are widely used as important chemical power sources in our daily life. In addition to long-term use in traditional digital products such as mobile phones and portable computers, the application range of lithium-ion batteries has gradually expanded to high-tech fields such as electric vehicles, aerospace and energy storage. [0003] As a commercial product, lithium-ion batteries must pass various strict performance tests before they can be put into use, including high and low temperature performance tests, rate performance, long-term cycle performance, and safety performance tests. Long-term c...

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/385
Inventor 梁大宇俞金萍
Owner SHANGHAI GUOXUAN NEW ENERGY CO LTD
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