Battery pack balanced management system

Abstract

The invention discloses a battery pack balanced management system, which comprises a battery pack module, a switch matrix module, a bidirectional DC-DC conversion module and a supercapacitor module, wherein the battery pack module comprises n serially connected single batteries; the switch matrix module is connected with the battery pack module and used for selecting and measuring the single batteries in the battery pack module; the bidirectional DC-DC conversion module is connected with the switch matrix module so as to charge or discharge the selected single batteries; and the supercapacitor module is connected with the bidirectional DC-DC conversion module and comprises a plurality of capacitors for storing energy. By means of the passive and lossless controllable power battery pack balanced system consisting of the switch matrix module, the bidirectional DC-DC conversion module and the supercapacitors, balanced precision and efficiency are improved, so that the service life of the power storage batteries is prolonged.

Description

technical field [0001] The invention relates to a balance management system of a battery pack, in particular to a balance management system of a lithium ion power battery pack. Background technique [0002] Since the operating voltage of an electric vehicle is usually as high as several hundred volts, and the maximum voltage that a lithium-ion battery can provide is only 4.3 volts, a large number of battery cells are connected in series to form a battery component that is an essential component of an electric vehicle. [0003] Despite the rapid progress in battery production technology, the differences between battery cells will not be eliminated, and the differences will not disappear with the use of batteries, but will continue to intensify in this project. Taking battery capacity as an example, when a current flows through the battery pack, the cells with large capacity are always in the state of shallow charge and shallow discharge with low current, while the cells with ...

AI Technical Summary

Problems solved by technology

However, if the resistance is selected too large during the equalization process, the equalization current will be too small and the effect will be minimal; if the resistance is selected too small, the resistance power will be large, the system energy loss will be large, and the equalization efficiency will be low

(2) Energy storage balance is to use the battery to charge and discharge energy storage elements such as inductors or capacitors, and realize the switching of energy storage elements between unbalanced batteries through relays or switching devices to achieve energy transfer between batteries. However, there are also Disadvantages of slow charging and discharging speed, high energy consumption and low equalization efficiency when storing balanced remaining power

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