Battery management system and power battery

Abstract

The invention discloses a battery management system, and belongs to the technical field of battery control. The battery management system comprises a battery pack formed by connecting a plurality of single batteries in series, an active equalization module, a passive equalization module, a battery monitoring module and a main controller. The battery monitoring module is in communication connectionwith the main controller and used for collecting output signals of the battery pack. The active equalization module and the passive equalization module are in communication connection with the main controller. The main controller processes the output signal and then sends an opening or closing instruction to the active equalization module or the passive equalization module. The output end of theactive equalization module is connected with the battery pack, and the control end is connected with the main controller for energy conversion between the battery packs. The active equalization modulecomprises a plurality of sub-equalization modules, and the plurality of sub-equalization modules are in one-to-one correspondence with the single batteries. The sub-equalization modules are used forcontrolling the energy conversion of the corresponding single batteries. The active equalization module controls the opening or closing of one or more sub-equalization modules at the same time. The design is simple and efficient, and the cost is low.

Description

Technical field [0001] The invention relates to a battery management system and a power battery, belonging to the technical field of battery control. Background technique [0002] Today, as environmental problems are becoming more serious, the development and application of new energy sources have gradually received attention. Among them, car batteries have attracted more attention because of their low efficiency and pollution. [0003] Due to differences in the manufacturing process and working environment of lithium-ion batteries, there are slight differences in the internal resistance and capacity of each battery cell. Especially after a group of multiple charge and discharge cycles, these small differences will gradually accumulate, resulting in increased inconsistency of battery cell voltage. And due to the "barrel effect" of the battery pack, the increase in voltage inconsistency will greatly reduce the available capacity and cycle life of the battery pack, posing a great th...

AI Technical Summary

Problems solved by technology

However, most of the existing equalization methods are inefficient, complex in design and high in cost

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