Method for correcting available capacity of battery, vehicle and medium

Abstract

The invention discloses a method for correcting the available capacity of a battery, a vehicle and a medium. The method for correcting the available capacity of the battery comprises the steps of: collecting an SOC value of the battery; judging whether the SOC value of the battery is smaller than or equal to a first SOC threshold value or not; if so, acquiring the discharge capacity and the residual capacity of the battery, and performing iterative estimation according to the discharge capacity and the residual capacity to correct the current available capacity of the battery; and if not, acquiring historical use parameters of the battery, and correcting the current available capacity of the battery according to the historical use parameters. The method can be suitable for the whole charging and discharging process of the battery, and improves the estimation precision of the available capacity of the battery.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a method for correcting the available capacity of a battery, a computer-readable storage medium and a vehicle. Background technique [0002] With the continuous development of science and technology, new energy vehicles, especially pure electric vehicles, are slowly entering every family as a means of transportation. Users have higher and higher requirements for vehicle performance, especially for comfort. Therefore , the vehicle must be required to adapt to different driving needs, especially, in the use of pure electric vehicles, the battery is the most critical component of the electric vehicle, and the performance index that users are most concerned about is the cruising range. With the continuous use of the battery, the available capacity of the battery slowly decays. Customers are very concerned about the real state of health of the battery, that is, SOH (State of Health, ...

AI Technical Summary

Problems solved by technology

[0003] However, there is a plateau period in the charging and discharging process of the battery, and the error in estimating the battery SOC (State of Charge, state of charge) based on the voltage value is relatively large, which in turn affects the calculation of SOH

During the charging and discharging process of the battery, it is affected by three kinds of polarizations: electrochemical polarization, concentration polarization and ohmic polarization, resulting in a difference between the open circuit voltage and the actual detected voltage, and this difference is in the process of stopping charging and discharging. It is not eliminated instantly, usually it takes more than ten minutes, or even more than an hour, which makes it an obstacle to the strategy of estimating battery SOH

In addition, the SOC-OCV curve of the battery is extremely low in the range of 30%-100%, that is, a small change in the battery voltage will cause a large-scale change in the SOC. At this time, the SOC-OCV curve method cannot be used, and it is difficult to estimate accurately

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