Power battery equalization control method and corresponding battery management system

Abstract

The invention discloses a power battery equalization control method, and the method comprises the steps: judging whether the equalization processing of a battery pack of an electric car needs to be carried out or not when the electric car is in a charging state or a discharging state; determining each to-be-equalized cell in the battery pack when the equalization processing of the battery pack needs to be carried out; reading the equalization time of each to-be-equalized cell from a storage unit which stores the equalization time of each cell, and carrying out the equalization of each cell through the corresponding equalization time. The invention also discloses a corresponding battery management system. According to the embodiment of the invention, the method can effectively reduce the hardware cost, reduces the heat dissipation risk of a hardware cost, and prolongs the service life of the battery.

Description

technical field [0001] The invention belongs to the field of passive equalization of power batteries of electric vehicles, and in particular relates to a power battery equalization control method and a corresponding battery management system. Background technique [0002] Electric vehicle power batteries usually consist of multiple single cells connected in series. Due to the inconsistency of the capacity, internal resistance and self-discharge rate of the single battery, the voltage of the single cell is inconsistent. In actual use, the capacity that the power battery can actually release is determined by the single battery with the worst performance. When the capacity of the single battery is exhausted, the power battery circuit must be cut off to protect the entire power battery; the charging process is also Similarly, when one of the single cells is fully charged and reaches the predetermined charging protection point (such as 4.2V), the power battery circuit must be cu...

AI Technical Summary

Problems solved by technology

The current vehicles basically do not have the function of timing when the vehicle is parked and turned off. In order to obtain the standing time of the vehicle, an additional timing hardware module must be added, which increases the hardware cost.

[0008] In the charge equalization method, under the charging conditions, the time for the battery cell voltage to charge from the judgment point to the voltage protection point is relatively short. In order to achieve the equalization effect, the equalization current must be increased, which will lead to an increase in hardware costs and hardware circuit heat dissipation problems.

Images