Nondestructive equilibrium management system of modular high-power battery pack

Abstract

The invention provides a nondestructive equilibrium management system of a modular high-power battery pack. The system comprises an equilibrium charging/discharging module, a battery parameter acquisition module and a microprocessor, wherein the equilibrium charging/discharging module is connected with the battery pack to charge or discharge battery cells required to be equilibrated in the battery pack; the battery parameter acquisition module acquires battery information of each battery cell in the battery pack; and the microprocessor is used for receiving the battery information of the battery parameter acquisition module, judging a charge state of each battery cell according to the acquired battery information, determining the battery cells required to be equilibrated and the equilibrium time according to the acquired battery information if a preset threshold is exceeded, and controlling the equilibrium charging/discharging module to charge or discharge the battery cells required to be equilibrated according to the battery cells required to be equilibrated and the equilibrium time. According to the nondestructive equilibrium management system, the flow of energy between the battery cells is realized in a centralized management mode to finish an equilibrium management function, and dynamic online nondestructive equilibrium is implemented through charging, discharging or standing of the equilibrium charging/discharging module to the battery cells so as to finish nondestructive equilibrium management of the battery pack.

Description

technical field [0001] The invention belongs to the field of battery management systems for electric vehicles or high-power energy storage power stations, and in particular relates to a non-destructive equalization management system for modular high-power battery packs. Background technique [0002] Electric vehicles have the characteristics of zero emission, zero pollution, and low noise, and will become a means of transportation that our country will vigorously develop in the future. Lithium batteries are commonly used as power sources for electric vehicles due to their high power density and high voltage. In the power lithium battery pack, the inconsistency of the single cells will reduce the effective energy of the lithium battery pack and affect the performance of the electric vehicle. Therefore, it is necessary to study a reliable and efficient lithium battery pack balance management system, reduce the difference of single cells in the battery pack, ensure the reliabi...

AI Technical Summary

Problems solved by technology

The lossy equalization method also has the disadvantages of high energy consumption, low efficiency, slow equalization speed, and difficult heat dissipation.

The other is lossless equalization, also known as active equalization, which usually adopts the switch inductor and capacitor method, uses the inductor and capacitor as energy storage elements, and the switch circuit is used as the selection control of each single battery in the battery pack, but this method is slow in equalization speed , low efficiency, and the structure design of the control switch is complicated, and the system reliability is not high

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