Charge-discharge battery pack equilibrium management system

Abstract

The invention discloses a charge-discharge battery pack equilibrium management system which comprises N batteries, N-1 lossless equilibrium charge-discharge circuits, a signal acquisition circuit, a master control unit and a drive circuit, wherein each lossless equilibrium charge-discharge circuit comprises an energy storage inductor, an energy storage capacitor, a first semiconductor switch device and a second semiconductor switch device and is characterized in that the energy storage capacitor is connected in series between a switch back end of the first semiconductor switch device and a switch front end of the second semiconductor switch device. The charge-discharge battery pack equilibrium management system has the obvious effects that the capacitor in the equilibrium mode plays a role of energy transfer, which reduces the power consumption, has more advantages in volume and weight, and has stronger mechanical impact resistance. The charge-discharge battery pack equilibrium management system realizes the energy equilibrium of batteries, dispensing with a complicated energy transfer device, and has the advantages of simple structure, easy realization and convenient maintenance and expansion.

Description

technical field [0001] The invention relates to a circuit for charge and discharge management of a large-scale lithium battery pack, in particular to a management circuit for a power supply system of an electric vehicle, and to a charge and discharge battery pack equalization management system with a fault prevention circuit . Background technique [0002] With the gradual depletion of oil resources and the increasing pressure on the environment, there is an increasing demand for electric energy to replace traditional fossil fuels and make it the main power source for vehicles. In addition, with the advancement of science and technology, the development of new electronic equipment such as notebook computers, microcomputers, digital cameras, mobile phones, medical equipment, earth satellites in low-earth orbits and synchronous satellites in high-orbits, higher demands are placed on the battery industry. requirements. Low cost, high energy density, high voltage, light weight...

AI Technical Summary

Problems solved by technology

[0022] The disadvantage of this balance management circuit is that it only uses inductance to transfer energy, so if you want to increase the efficiency, you must greatly increase the inductance value, and due to the limitation of the manufacturing process of the inductance, its equivalent resistance is relatively large, resulting in large power loss

Although the inductance can flow a large current, the inductance has the problem of magnetic saturation. When the frequency is lower than the natural frequency of the inductance, it will cause a huge increase in the current. The light one is the increase of power consumption, and the serious one will burn the circuit. power components

In addition, its volume and weight are not very dominant, and the magnetic core is afraid of falling

And the experiment proves that its efficiency is low, generally less than 40%, so this scheme is not suitable for practical application

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