Battery OCV curve correction method and related product

By determining whether the characteristic parameters of the battery cell meet the target operating conditions in the battery management system and updating the OCV curve, the problem of the SOC estimation deviation from the true value of the battery cell is solved, and the estimation accuracy of the SOC is improved.

CN119827987APending Publication Date: 2025-04-15CHONGQING FUDI BATTERY RES INST CO LTD
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Patent Information

Application Number
CN202311728047.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-12-14
Publication Date
2025-04-15

AI Technical Summary

Technical Problem

In the existing battery management system, the SOC estimation method based on the average OCV curve has a problem of deviating from the true value, especially after the battery cell is charged and discharged, the real OCV curve has deviated from the average OCV curve.

Method used

By determining whether the characteristic parameters of the battery cell during the set period fall into the parameter range of the target operating conditions, if all fall into it, the current OCV curve of the battery cell is updated to the target OCV curve corresponding to the target operating conditions.

Benefits of technology

The corrected OCV curve is closer to the real OCV curve of the current operating condition, thereby improving the estimation accuracy of SOC.

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Abstract

The embodiment of the invention provides a battery OCV curve correction method and a related product. The curve correction method comprises the following steps: determining whether N characteristic parameters of a battery cell in a set time period all fall into N parameter ranges corresponding to a target working condition; and updating the current OCV curve of the battery cell to a target OCV curve corresponding to the target working condition under the condition that the N characteristic parameters fall into the N parameter ranges corresponding to the target working condition. According to the embodiment of the invention, the OCV curve can be corrected, so that the corrected OCV curve is closer to the real OCV curve of the current working condition.
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