Charging management method for power batteries

Abstract

The invention is applicable to the technical field of power batteries and provides a charging management method for power batteries. The method comprises the following steps: S1, obtaining the currentremaining quantity of electric charge of the power battery; S2, reading the charge rate corresponding to the remaining quantity of electric charge, wherein a remaining quantity of electric charge-charging rate mapping table is stored in the power battery; and S3, charging the battery according to the charge rate corresponding to the current remaining quantity of electric charge. A negative electrode material lithium graphite intercalated compound has four phases in lithium intercalation and lithium deintercalation processes; and at the phase transition point, the voltage becomes high and thedV / dQ value becomes large, the ratio of the dV / dQ fitting value to the dV / dQ measurement value is used as the electric current rate factor of the corresponding quantity of electric charge, and the charging rate at the sudden changing point is lowered so as to reduce the damage of the phase change stress during the phase change to the battery.

Description

technical field [0001] The invention belongs to the technical field of power batteries and provides a charging management method for a power battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density and long cycle life, and their application range continues to expand, becoming the mainstream battery in the field of electric vehicles. During the use of batteries, the batteries must be charged before they can provide energy to drive electric vehicles. [0003] In the prior art, there are mainly four ways to charge the power battery, constant current charging, constant voltage charging, pulse charging, and a combination of the above three methods. The current is charged to the full voltage of the battery, and then maintained at a constant voltage until the charging current is less than a set value. As we all know, there are not only chemical polarization and concentration polarization in the charging process of batteries, but also ...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a power battery charging management method, which aims to solve the problem that the active material is subjected to three polarization forces in the existing constant current and constant voltage charging process, which easily leads to damage to the active material of the battery and reduces the service life of the battery.

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