Battery pack energy balance structure and implementation method thereof

Abstract

The invention provides a battery pack energy balance structure and an implementation method thereof and belongs to the technical field of battery management. The balance structure comprises an A-side switch array and a B-side switch array which provide a closed circuit, and an energy isolation transmission circuit based on an isolation DC/DC converter. The A-side switch array is connected with a single battery with high energy, the B-side switch array is connected with a single battery with low energy, so that the single battery with high energy and the single battery with low energy are respectively connected to two ends of the energy isolation transmission circuit. No electric connection exists between the input end and the output end of the energy isolation transmission circuit, and the energy of the single battery connected with the input end is transmitted into the single battery connected with the output end in an isolation manner. By controlling the switch arrays, energy flowing between the signal batteries can be achieved, and battery pack energy consistency is achieved. By the battery pack energy balance structure which is high in balance efficiency, simple to control and applicable to the balance of a super capacitor bank, point-to-point energy transmission of the single batteries in a battery pack is achieved.

Description

technical field [0001] The invention belongs to the technical field of battery management, and in particular relates to a balanced topological structure of a battery pack and a specific circuit design thereof. Background technique [0002] Due to the limitation of the low voltage of the battery cells, in many occasions it is necessary to connect multiple battery cells in series to form a battery pack to obtain a higher voltage to meet the application requirements. Due to the influence of factors such as the manufacturing process of the battery cells and the use environment, there are certain differences in the performance of the battery cells used in series, resulting in the inability to maximize the performance of the battery pack and reduce the life of the battery pack. In severe cases, it will cause Safety issues of battery pack usage. Aiming at the problem of inconsistent performance of single cells in the battery pack, designing a simple and efficient battery pack equa...

AI Technical Summary

Problems solved by technology

[0003] The Chinese patent publication number is CN 103023107 A (application number 201210528624.1), which discloses a new equalization circuit for lithium battery packs. This structure requires a capacitor as a temporary energy storage device, and the control is complicated and the equalization speed is relatively slow.

[0005] The Chinese Patent Publication No. CN 103066665 A (Application No. 201310019905.9) discloses an active equalization circuit and its equalization method. An equalization structure is disclosed. The control of the energy transmission circuit in this equalization structure is complicated and difficult to

Images