Battery equalization strategy of hybrid power system and hybrid power vehicle

Abstract

The invention provides a battery equalization strategy of a hybrid power system and a hybrid power vehicle. The battery equalization strategy comprises the steps that whether the residual electric quantity of a battery cell with the highest electric quantity is greater than a preset residual electric quantity or not is further judged if the voltage difference between the battery cell with the highest electric quantity and a battery cell with the lowest electric quantity in a battery pack is greater than a preset voltage difference; if the residual electric quantity of the battery cell with the highest electric quantity is larger than the preset residual electric quantity, the battery equalization action starts, during the battery equalization action, the hybrid power system judges whether a motor executes a power consumption action or a power generation action according to the voltage of the battery pack, and the power consumption action and the power generation action correspond to discharging and charging of the battery pack; and if the equalization ending condition is met, the battery equalization action is ended. The technical problem that the hybrid power system in the prior art cannot perform battery equalization is solved, the battery equalization scene of the hybrid power system is greatly increased by adopting the battery equalization strategy of the hybrid power system provided by the invention, the battery equalization can be fully performed, and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the field of vehicles, in particular to a battery balancing strategy of a hybrid system and a hybrid vehicle. Background technique [0002] In the prior art, a vehicle using an electric system will balance the power of the lithium battery pack of the vehicle. The current balancing strategy is: when the power of the lowest battery cell in the battery pack is less than 30%, the battery pack in the lithium battery pack will be prohibited. The purpose is to avoid over-discharge of the lithium battery caused by the balance of electricity. Since the battery in the EV system of a pure electric vehicle is often fully charged, the balance condition is easy to meet and can protect the battery. The flow chart of the battery balance strategy in the prior art is as follows image 3 shown. [0003] But for a hybrid system, the battery needs to maintain a state that can accept braking energy recovery and power assist energy output, so the po...

AI Technical Summary

Problems solved by technology

[0004] Based on the above problems, the present invention proposes a battery balancing strategy for a hybrid system and a hybrid vehicle, which solves the technical problem that the hybrid system cannot perform battery balancing in the prior art, and adopts the battery balancing strategy of the hybrid system provided by this embodiment The strategy greatly increases the battery balancing scenarios of the hybrid system, enables battery balancing to be fully carried out, and improves battery life

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