Method for determining charge state of vehicle-mounted storage battery

Abstract

The invention relates to a power supply technology, in particular to a method for determining the charge state of a vehicle-mounted storage battery. According to the invention, the method for determining the charge state of the vehicle-mounted storage battery comprises the following steps of: inputting the working voltage, the working current and the working temperature of the storage battery; calculating a corrected working voltage value of the working voltage under the standard working current of the storage battery; determining the corrected working voltage value and a fuzzy value of the working temperature by utilizing respective membership functions; determining a fuzzy value of the charge state of the storage battery by utilizing a fuzzy inference rule according to the corrected working voltage value and the fuzzy value of the working temperature; and calculating the charge state of the storage battery by utilizing an anti-fuzzy algorithm according to the fuzzy value of the charge state of the storage battery. According to the embodiment of the invention, test curves and empirical data can be fully utilized through introducing a fuzzy logic when a SOC (Stress Optical Coefficient) is estimated, so that the result accuracy is improved.

Description

technical field [0001] The invention relates to power supply technology, in particular to a method for determining the state of charge of a vehicle storage battery. Background technique [0002] With the depletion of traditional fossil fuel energy, the development of hybrid vehicles and electric vehicles has become a common choice in the industry. At present, the main problems restricting the promotion and use of new power vehicles include the capacity and service life of power batteries. In this case, the effective management of batteries is becoming more and more important. [0003] Battery management includes the following three key technologies: fast charging technology, equalization technology, and estimation of battery remaining capacity or state of charge (SOC), among which SOC estimation is particularly important, because only when the battery SOC is known accurately and reliably can it be Provide users with reasonable battery usage policies. [0004] Commonly used...

AI Technical Summary

Problems solved by technology

But the disadvantage is that the initial value of SOC is often difficult to determine and the cumulative error will continue to increase as time goes by, resulting in a larger error in the calculation result of the SOC value.

In addition, when calculating SOC with the current integration method, an accurate estimate of the charge-discharge coefficient is required. When the battery working environment changes greatly, it is difficult to determine the charge-discharge coefficient accurately and in time, which will also lead to problems in the final calculated SOC result. big error

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