Method and device for verifying electric quantity of lithium battery and medium

Abstract

The invention discloses a lithium battery electric quantity verification method and device and a medium, and the method comprises the steps: controlling a to-be-detected vehicle lithium battery to be charged and discharged circularly until the number of times of discharging reaches a first preset number of times, enabling the SOC to reach a first preset value in each discharging, and enabling the rest of the charging except the first charging to be not fully charged. When the number of times of discharge reaches a first preset number of times, the battery is controlled to be completely discharged to consume time, and whether the consumed time meets a first preset condition or not is judged to determine that the SOC is accurate. Therefore, the actual application condition of the vehicle is simulated by circularly charging and discharging the battery, the condition that the vehicle cannot be fully charged and discharged in actual use is simulated by incompletely discharging each time of discharging and incompletely charging each time of charging, and the battery is completely discharged after multiple cycles to obtain consumed time; whether the SOC of the battery is accurate or not is determined by judging whether the consumed time meets the first preset condition or not, and the detection accuracy of the SOC is improved.

Description

technical field [0001] The present application relates to the field of battery detection, in particular to a method, device and medium for verifying the electric quantity of a lithium battery. Background technique [0002] With the continuous improvement of environmental awareness, lithium batteries are widely used in industrial vehicles and other vehicles. In the vehicle lithium battery management system, the accuracy of the battery's state of charge (State Of Charge, referred to as SOC) is of great significance. The battery's SOC Accuracy directly affects the control strategy of the battery management system, and directly affects the user experience. In order to check whether the actual SOC of the vehicle’s lithium battery is consistent with the displayed SOC, that is, to check the accuracy of the vehicle’s SOC, it is usually detected by full and full discharge, that is, the battery is fully charged, and then the vehicle is used to discharge, and the vehicle is used to ens...

AI Technical Summary

Problems solved by technology

[0003] The SOC accuracy of the battery is detected by the method of full charge and discharge. Since the vehicle consumes a lot of power when it is going uphill or braking, there will be errors when using the ampere-hour integral method to calculate the SOC of the battery. , In addition, in the actual application of the vehicle, it is impossible to fully charge and discharge every time, which leads to poor accuracy of the detected SOC

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