Cell equalization system based on bidirectional DC/DC

A battery equalization and battery module technology, which is applied to battery circuit devices, current collectors, electric vehicles, etc., can solve problems such as complex circuit composition and control structure, low equalization efficiency, and small equalization current, so as to improve reliability and safety performance, solve the heating problem, and reduce the effect of material cost

Inactive Publication Date: 2012-09-12
DONGGUAN NVT TECH
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Problems solved by technology

Among the existing equalization technologies based on the inside of the battery module, some achieve passive discharge equalization by constructing an independent power resistor discharge circuit for each single battery. This is an energy-consuming discharge equalization method. At the same time, it will also cause heating problems; some of them pass the excess energy of the single battery to other single batteries through

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  • Cell equalization system based on bidirectional DC/DC
  • Cell equalization system based on bidirectional DC/DC
  • Cell equalization system based on bidirectional DC/DC

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[0023] The present invention will be further explained below in conjunction with the drawings.

[0024] Please refer to figure 1 , The present invention provides a two-way DC / DC-based battery balancing system, which includes a battery module 1, a battery management unit 2, and a power bus connected between each battery management unit 2. The battery management unit 2 includes a single-chip microcomputer 11, Bidirectional DC / DC module 12, bidirectional polarity switch 13, drive / interlock circuit 14. The input end of the bidirectional DC / DC module 12 is connected to the power bus, and the output end of the bidirectional DC / DC module 12 is connected to the bidirectional polarity switch The input terminal of 13 is connected, the charge / discharge equalization control terminal of the single-chip microcomputer 11 is connected to the control terminal of the bidirectional DC / DC module 12, the feedback terminal of the bidirectional DC / DC module 12 is connected to the state diagnosis termina...

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Abstract

The invention relates to the cell equalization system technology field and especially relates to a cell equalization system based on bidirectional DC/DC. The cell equalization system comprises a cell module, a cell management unit and a power supply bus. The cell management unit comprises a single chip microcomputer, a bidirectional DC/DC module, a bidirectional polarity switch and a driving/interlocking circuit. An input terminal of the bidirectional DC/DC module is connected with the power supply bus. An output terminal of the bidirectional DC/DC module is connected with the input terminal of the bidirectional polarity switch. A charging/discharging equalization control terminal of the single chip microcomputer is connected with a control terminal of the bidirectional DC/DC module. A polarity switch control terminal of the single chip microcomputer is connected with the control terminal of the bidirectional polarity switch. The single chip microcomputer controls a bidirectional switch array through the driving/interlocking circuit. According to the invention, through using the single chip microcomputer to control the bidirectional DC/DC module, the bidirectional polarity switch and the bidirectional switch array, time sharing charging and discharging equalization of each cell in the cell module can be realized.

Description

technical field [0001] The invention relates to the technical field of battery balancing systems, in particular to a battery balancing system based on bidirectional DC / DC (direct current to direct current). Background technique [0002] In the high-voltage battery pack of new energy vehicles and energy storage systems, in order to ensure that the battery system has sufficient energy and prolong the service life of the battery pack, it is necessary to effectively balance the single cells connected in series in the high-voltage battery pack. Among the existing equalization technologies based on the inside of the battery module, some achieve passive discharge equalization by constructing an independent power resistor discharge circuit for each single battery. This is an energy-consuming discharge equalization method. At the same time, it will also cause heating problems; some of them pass the excess energy of the single battery to other single batteries through adjacent single ...

Claims

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Application Information

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IPC IPC(8): H02J7/00
Inventor 成勇黄世霖胡建国
Owner DONGGUAN NVT TECH
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