SOC estimation precision determination method and device and storage medium

Abstract

The invention discloses an SOC estimation precision determination method and device and a storage medium. The method comprises the steps of carrying out the charging or discharging of a battery through a battery management system, and enabling an initial SOC display value of the battery and an initial actual SOC value of the battery to reach a same value, modifying the initial SOC display value or modifying the initial actual SOC value to enable the initial SOC display value after modification operation to be different from the initial actual SOC value, charging or discharging the battery through a battery management system, and collecting and recording the current in the charging or discharging process, the SOC display value of the battery and the actual SOC value of the battery, and determining SOC estimation precision according to the collected and recorded current in the charging or discharging process, the SOC display value and the actual SOC value. According to the method, the SOC estimation precision can be rapidly and accurately evaluated, the evaluation speed is high, the consumed time is short, the evaluation result is accurate, and the credibility is high.

Description

technical field [0001] The present application relates to the field of battery technology, and in particular to a method, device and storage medium for determining the accuracy of SOC estimation. Background technique [0002] SOC (State of charge, battery state of charge) refers to the room temperature state of charge of the battery, which is used to reflect the remaining capacity of the battery. It is numerically defined as the ratio of the remaining capacity to the battery capacity, and is generally expressed as a percentage. SOC estimation is very important to battery usage. For example, when a mobile phone suddenly shuts down when it shows that it has a battery, most of the sudden shutdown of an electric vehicle during driving is due to a large deviation in SOC estimation. The existing SOC accuracy verification method such as GB / T 897 is to select a temperature range and put it on hold for 16 hours, discharge the battery with a constant current, measure the actual capaci...

AI Technical Summary

Problems solved by technology

[0003] Because battery SOC estimation is affected by multiple parameters such as battery voltage, temperature, current, working conditions, battery status, charge and discharge efficiency, acquisition accuracy, and acquisition frequency, the existing test methods only test the accuracy for a short period of time, and can only judge the Measure the error that may be caused by battery SOC estimation, but cannot test the calibration of SOC estimation to error

This kind of battery with good test results will cause a large error in the actual SOC due to the long-term uncorrected battery in the actual use process. Because the error is inevitable, as the error accumulation becomes larger and larger, the SOC may be very low in actual use. Sudden jump or shutdown in high state

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