Equalization circuit for battery system, battery management system, and working machine

Abstract

The invention provides an equalization circuit for a battery system, a battery management system, and a working machine. The battery system comprises at least two battery cells, and the equalization circuit comprises a control module and an equalization module; the equalization module comprises an equalization unit and a switch unit set, and the switch unit set comprises at least two switch units; the control module is connected with the equalization unit through the switch unit set, and each switch unit is connected with each battery cell in a one-to-one correspondence manner; and the control module controls the target switch unit in the switch unit set to be switched on according to a selection instruction of the battery management system, transfers the equalization energy of the target battery cell corresponding to the target switch unit to the equalization unit, and controls the equalization unit to transfer the equalization energy to a charging and discharging circuit of the battery system. Through simplifying the equalization module, the whole equalization circuit is effectively simplified, meanwhile, the control circuit only needs to control the corresponding switch units to be switched on or switched off, the equalization time is effectively shortened, and the equalization efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of battery system equalization, in particular to a battery system equalization circuit, a battery management system and an operating machine. Background technique [0002] Lithium batteries have the characteristics of "no memory" effect, high energy density, long cycle life, and high charge and discharge rate, making lithium batteries a key focus in the fields of new energy vehicles and energy storage. Multiple single lithium-ion batteries can be combined in series and parallel to realize small and large energy systems. Although lithium batteries form an energy-type and power-type energy system by connecting several single lithium-ion batteries in series and parallel, due to the differences and fluctuations in the production process of batteries, there will be differences in the factory of different single lithium-ion batteries. With the increase of charge and discharge times and the inhomogeneity of the us...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a battery system equalization circuit, a battery management system and an operating machine, which are used to solve the cumbersome defects of the equalization circuit in the prior art, and realize that by simplifying the control module and the equalization module, the equalization time can be effectively shortened and the equalization efficiency can be improved.

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