Sodium-ion battery theoretical energy density calculation method and system

Through experiments, the state of charge and potential curves of sodium ion batteries were obtained and processed, and combined with integral calculation, the error problem in the calculation of the theoretical energy density of sodium ion batteries was solved, and high-precision and highly adaptable energy density calculation was achieved.

CN119689296AActive Publication Date: 2025-03-25BENAN ENERGY TECH JIANGSU CO LTD
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Patent Information

Application Number
CN202510207795.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-25
Publication Date
2025-03-25
Estimated Expiration
2045-02-25

AI Technical Summary

Technical Problem

In the prior art, the theoretical energy density calculation method of sodium ion batteries cannot accurately reflect the dynamic working state due to error problems caused by platform irregularity and capacity ratio, and is insufficient inapplicability.

Method used

Through experiments, the relationship curve between the charge state and potential of the positive and negative electrodes was obtained, normalized processing and abscissor scaling were performed, combined with integral calculation, the dynamic voltage response was accurately quantified, the total battery energy and the total electrode mass were calculated, and the theoretical energy density was obtained.

Benefits of technology

It improves calculation accuracy, adapts to different battery design scenarios, is compatible with excessive design of positive or negative electrodes, and enhances R&D efficiency.

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Abstract

The invention provides a sodium ion battery theoretical energy density calculation method and system, and relates to the technical field of battery energy density calculation, and the method comprises the steps: obtaining a relation curve of positive and negative charge states and potential through an experiment; normalizing the specific capacities of the positive electrode and the negative electrode based on the curve to generate a normalized state-of-charge curve; adjusting the abscissa scaling of the corresponding normalized curve according to positive or negative electrode excess setting; integrating the scaled curve in a 0-1 interval to obtain an integral value; calculating the total energy of the battery and the total mass of the electrode by combining the integral value, the positive and negative electrode specific capacity and the excess ratio; the theoretical energy density of the battery is obtained through the ratio of the total energy of the battery to the total mass of the electrode. According to the method, the problem of errors caused by irregularity of a platform and capacity ratio in a traditional method is effectively solved, and a more scientific and reliable theoretical tool is provided for performance evaluation and optimization of a sodium-ion battery material.
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