Battery management system power calculation method

Abstract

The invention provides a battery management system power calculation method comprising the following steps: S1, detecting the charging and discharging characteristics of a battery under different preset temperature ranges and different preset charging and discharging ratios, and establishing a charging and discharging chemical model through a database based on obtained test data; S2, determining a series of battery state-of-charge change values under different preset temperature ranges and / or different preset charging and discharging ratios according to the charging and discharging chemical model database; and S3, calculating the battery power and selecting a corresponding battery state-of-charge change value according to the current temperature and charging and discharging ratio in order to calibrate the battery power. Compared with the prior art, the electrochemical model of the battery under the influence of temperature and the electrochemical model of the battery under the influence of ratio are established, the two factors are intelligently associated with the state of charge of the battery, and accurate and intelligent power calculation can be achieved in practical use.

Description

technical field [0001] The invention relates to a battery management system power calculation method, in particular to a method for intelligently managing battery charge capacity in combination with the influence of temperature differences and magnification differences on the power of the battery management system. Background technique [0002] The battery charge capacity (SOC, State Of Charge) refers to the ratio of the remaining capacity to the capacity of the fully charged state. With the increase of car ownership worldwide and the shortage of oil resources, more and more power batteries are being used in the automotive field. New vehicle technologies include hybrid (H E V) plug-in hybrid (P H E V) and pure electric (EV). And these vehicles will involve a very important issue: battery charge estimation, that is, power estimation. Electricity estimation is like the fuel volume of a gasoline car. If the estimation is wrong, it will directly affect the user's use. Since l...

AI Technical Summary

Problems solved by technology

Electricity estimation is like the fuel volume of a gasoline car. If the estimation is wrong, it will directly affect the user's use

Since lithium batteries are very sensitive to temperature and discharge rate, the discharge curves at different temperatures and rates are quite different. For this reason, the accuracy of power estimation is directly affected.

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